Why your car runs slower AFTER you tune it. Hint, it's not the tune.
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- čas přidán 5. 09. 2024
- Ever get your car tuned, and after it's tuned it's slower, well there's many potential reasons as to why, and this is the most common reason your car is either slower or runs the same time AFTER you have a custom tune installed in the vehicle.
How the hell does this channel have ONLY 28k subs. The knowledge Alex has isn’t found anywhere else. Keep it up man great video as usual.
peapodamoose : I swear i wonder that all the time. Should easily be over 100k subs. A lot of Chevy boys sneak in here for knowledge and just don’t sub. Shame
I wonder the same thing. Not everyone can recognize gold.
Probably because the guy is smug asshole.
Casey Clark he’s not an asshole he’s just straight up honest
So glad a tuner did a video on this. So many people think you can run same time in high da as you can in low da. They just don't get it.
I grew up with nothing but old carbed cars and I love drag racing. Everything you just said is 100% correct and DA is a MFer sometimes. Great info as usual.
I'm so glad I watched this video. I have noticed lately that the car has been a little sluggish from what I'm used to. Its been hot as hell and the heat is definitely effecting the way my car has been running. Dense Air makes all the difference for sure. Glad I didn't bug my tuner. As always you make great vids that are always the truth. Thanks for always teaching me something new.
Great explanation Alex! My 2017 5.0 ran 12.76 w/ a roush CAI, and an x pipe with roush axle-backs in 650 DA @ 111.49 mph and with a VMP E85 tune and the same setup it went 12.80 @111.81 mph in 2600 DA so I was pleased.
god the swagger when he can explain something complicated in a manner like this. dope AF
Also like to add, Winter time gas is a different blend than summer time blend of gas.
I know my Audi A4 was tuned, and consistently ran mid-4 second 0-60 times, rain or shine - only 290whp, but felt super fast part-throttle or full-throttle. In contrast, my BMW has been tuned/retuned over and over, and it feels slow, even with more theoretical power at the engine. Only the first tune I had, with DME tuning, and the car felt super fast, and likely pulled timing - I have never been able to get even close to that on any other setup. Yes, weather makes a difference, but unless it's drastic different, you shouldn't notice it (5-10hp). For the most part the reason why cars feel slower when tuned/modded is because there are so many variables that work together and the ECU (car computer) and there are causes that regulate the power. Might sound wack, but after years of tuning I'm also convinced that certain car manufactures implement covert anti-tuning measures which can detect enhanced fuel/air parameters and regulate the actual power the car is making. This is probably to discourage tuning of base models to perform like more pricey up-models (eg tuning an BMW 330i to perform very close to a standard 340i). Also keep in mind- most tuners don't tune for part-throttle improvements, it's full-throttle or nothing. If you are coming from a refined tune like Unitronic or APR, for example, an independent custom tuner may allow for 10-15 more peak whp at WOT, but the power won't necessarily feel as responsive and smooth.
Fantastic advice for the newbies. I always had people take their CAI/tune to the track, make a run or two, install the CAI/tune and run again. Same day, same temps, DA etc, only 15-20 min apart...
Love your simple, no nonsense approach to educating the masses....and you do it basically for free. Nice!
Man ... everyday this guy keeps educating us... keep up the good work Alex... 2017 gt owner here
You are 100% spot on, I drag race and the weather makes a huge difference on how a car performs. My times change by 2/10s of a second based on density altitude.
Some tuners are stuck in that old mind set of everything needs to be static in order to be good and consistent. So maybe not a Lund tune, but others it could be the tune. With modern ecu calibration the benefit is you can be dynamic and adaptive so that the engine runs optimally in all conditions external or internal. Counter intuitively this actually produces a more consistent car as the weather effects how it performs less, not more. Thanks Alex for your great content (informative or entertaining ) keep it coming.
that's why I give it full throttle everytime im out to work. it feels so much better than any other time
Thanks for a kick ass e85 tune
BurninRubber93 You got a tune from him?
This happened to me, lost 3 tenths on 2 different days at the same track on a stock tune coyote car. (1/8th) 8.01 in march, 8.30 in july. Everything was the same and now i know why it slowed down so much. Thanks alex
Density Altitude = Witch Craft
Being in AZ we know this all too well, great video laying it to us straight
Michael Gotzinger right my car drives like a supercar in the morning and a Prius in the afternoon.
That 120 degree heat😒😒
Everyone on CZcams should see this. They don't understand why sometimes cars in PR usually run much slower. For example everyone is used to seeing mid to high 12s in a ISF in CZcams but when someone in PR does a pass and runs mid to low 13s they start blaming the driver. When here in PR it's usually very hot and humid.
This...big time this.
I went 12.538 stock with a tune.
D/A was great and I had crappy tires.
Went back down to the track the following year on better tires, headers and catless and picked up 2/10ths.
D/A was much higher the second trip down.
I use a D/A calculator to help make my runs a little more accurate when comparing.
I cant wait to bolt the boss 302 intake on and go back this year.
Your straight to the point attitude is exactly why I subbed. It's becoming rarer and rarer in this world for people to speak their minds because they worry about offending. Not to mention you know what the fuck your saying which is also becoming rare on CZcams.
At least I recognized DA the other day! Very informative video, Alex. Looking forward to the E85 tune.
Good points, I could see this being an issue for people with carbed setups running ignition systems that don't compensate for temperature. Unless they're tuning it in at the track chances are they're running timing for worse case scenario (e.g. hot weather) and are actually leaving power on the table when its cool without even realizing it in those vehicles. It becomes a lot more obvious in a modern car that automatically keeps the tune "proper."
That said I'd hope that someone that's been into working on cars for decades would know that colder air is more power without an extensive explanation.
If someone's been racing for 20 years they should know the effects of different temps lol
Just bought an ngauge and a tune from Lund racing.....pretty sure you are the one who did the tune! Very excited to see what happens when I install it. Wont have it till Wednesday.
This is why i love the winter time here in Florida. My super charger comes alive. When the temps drop around the 50s 60s the car almost gets scary... Rolling burn outs at 70 is easy...
Amen! That is why you cant compare times from one person at a different place to your times even on same days! DA is a huge factor. My car has been running 11.9 with headers tune and e85 with 4k DA and over 100 degree temps....A lot of people are knocking the time and saying it should be faster and blah blah but thats all part of the weather conditions! im sure in negative DA and cooler weather with same mods the car would run a few tenths faster!
When I had my 5.0 I ran a stock tune, then uploaded a Lund tune and ran it again 30 mins later, it ran 5 tenths and 4mph faster.
Regular Guy Garage I had 2 identical 15 GT Automatic Mustangs both on drag Tires one was bone stock the other had a Lund tune The stock car was 0.1 faster Running both cars next to each other And we switch drivers
Regular Guy Garage ive always heard Lund is the company to go to for 5.0s, that's a solid gain
Recently threw a Lund tune on my 2011 with bolt ons. I evidently don’t know what gears are in my diff (bought the car used) as I told them 3.73’s (per axle code on door jamb sticker) but whatever flash was on the car was broken when I reflashed it. I was at first like DEUUUUMMMM DIS BITCH GETS TO 100 QUICK and then it dawned on me either everyone after that was doing 60 in a 45 or it broke a speedo fix 😭😭😭 that said, car never did fry the tires in first or second but with the tune and the supporting mods I have it now easily roasts them in said gears.
How do you find the gear ratio I bought my car new and never saw where it listed the gears but I have a tune and,my Speedo is fine I just chose a stock gear option lol
If the gears are stock, there should be a tag bolted to your rear end cover with the ratio on it.
Amen. I’m not even a racer and I take meticulous note as to my power, DA, temp, etc. Love your videos, man. Keep up the kickass work. 🤘😎 Subscribed
Alex tune your camera!!! Don't tell me your ambient air temp causes that. Keep the videos coming :D !
Scott Bogan lol. I thought for a second I was in the Matrix watching this video.
Talking with hands camera doesn't know who too watch 😎 good video by the way
Its true about tge temp outside...here nj when its above 85 degrees my car sux but when is below 85 what a different...weather condition is a key
Also they get a few bolt ons and a Tune forgets all about tires and suspension
Then spins the entire 60foot and wonder why the cars is slower 🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣
January in Florida.... sea level and cool air made for our best times/mph
I get into this shit all the time. People asking me to go to the track every damn weekend in the summer and I refuse because I know what the car will do pass after pass after pass in the dead of summer and its pissing in the wind. I always tell them I know what it does at its worst (super high humidity and super fucking hottt), next time I take it, it will be to see what it does at its best when the humidty is normal and a nice crisp fall day.
Great subject. My favorite month is October, the DA is amazing.
I have the $$ to not worry about tuning however I have gone through a few engines due to E85/54/51 and the high sugar/corrosion of the internals of the engine despite fuel system upgrades. I will still tune , but I have gotten a good tuner that has a self adjusting tune, that compensates for all weather, elevation, and fuel types over a 25-30 mile period all on the drive. I will not do canned tunes that were don even in one area and the weather and elevation and fuel of that area half way across the county.
As a Ga resident this is my life.. 1200 one day 2900 the next
Kody Ingram here in ms south tn it’s the same
Alex so true I took out my 08 gt500 the other night and it was 45 to 50ish degrees and you can totally feel a difference. My car makes 850hp and being cold.The car feels almost dangerous. In. Fourth gear on the highway at 90mph and pinning it.The cat broke the tires loose.When it is 90degrees completely different feel.
I’m pretty sure “old school racers” know the correlation between weather and performance.
DA is 2500 in Florida in summer and 0 in the winter, it makes a BIG difference.
Great video as always. Still living my Lund tune on my 17 F150 5.0. 👍
Man I wish you tuned BMWs lol it’d be nice to have a helpful informative guy like you on the bmw side that’s available on social media outlets.
Keep making the good videos.
Making me want to get a Coyote Mustang just to get a tune from you lol.
Any body who pays attention to their car tuned or not should notice that, 40 to 50 degree weather my car runs like a beast start climbing up in the 70's and 80's you can feel the power drop off.
now this really makes me feel bad about living in South Florida. Its always summer down here. in the winter it rarely goes below 60 degrees
You’re absolutely correct my friend !
Anything Coyote Mustang Page:
“Um is there a rep for X in here. I got a tune and you fucked up! You better put me on the top of your priority list!”
DA, track prep, fuel quality, driver skill are all factors..
Biggest example of this is (for those who are familiar) when Duck runs his radial vs the world events in Feb/March and November/December. First, the track prep is going to be amazing and not soupy. Second, those nitrous/turbo/blower cars are going to go AAAAAPESHIT in that weather. Go out and run an amazing number and hide behind it till the next event.
Expected a yolo moment lol. Great video
Yolo moment almost came @3:58 LOL
Being a pilot I know all about Hp and density altitude and heat etc and how airplane engine performs if they went down and were good at drag racing doing et drags they would notice the car speeds up towards the end of the night cause air is colder and the track is cooling off so tires could be less oily etc u have to adjust your time as the night goes on so u don't bust out.
Nobody understands density altitude more than a Cessna pilot on a short runway.
Yeah great video I see this especially with a boosted car (dsm) they love cool weather but kinda lazy in summer heat @85 to 90degrees outside
Yes this an older post but I just want to add that any REAL veteran drag racer knows and knew about DA/weather long before computers controlled the tuning. For this old timer what the most frustrating thing is you cant tune the car real time. Unless you have a laptop(usually) and tuning software AND know how to use it...you stuck with the tune it is running. In the OLD DAYS you could mess with the timing and fuel(carburetor/distributer) anytime you wanted too. I just wish there was an easy way to get into the tuning of modern cars.
I finally got a handheld tuner and couldn't wait to tune. But it's 18F out. I hope the odd feeling is what you say about the cold air and not the tune.
Sure glad I understand density altitude. As a pilot, it's kind of a big deal.
I had a bolt on lt1 trans am that felt like night and day as far as temp and humidity go, I guess that thick ass iron block did retain a lot of the warmth on a hot day but 40-50 degrees and she was kickin lol, my ls1 car doesn't really seem too temperamental as far as temps go, not noticeably so like the lt1 car did
I run into this problem with my car. Although I'm smart enough to not blame anybody. I'm pretty much maxing out a turbocharged car with the stock turbo and stock intercooler. Running 11 psi more than stock with 93 only software. It runs like a raped ape in 50°f and colder weather pretty much back to back. But right now in Michigan with the highs possibly reaching 90°f on summer days. It gets heat soaked so fast. It's actually making more boost than it did in the winter and this down on power about 15%. But I know this is from my IAT's and I need to upgrade to a larger front mount intercooler. And even then I still could have issues because when you push a small turbo really hard it just creates a lot of heat. The 3" catless downpipe has helped some for under hood turbo temps. But he's right the bottom line is. A modern ECU will pull timing to avoid knock in hot humid weather it's just the reality of it. The higher the intake air temp the less power you can expect. Cold air is more dense. For us turbo guys that leads to a lot more power in cold weather and a lot less traction in cold weather ultimately. I can't wait till this fall so I can do 2nd gear burnouts on the highway Entrance Ramp again. Lol.
great information. thanks Alex.
Welcome to Alabama weather. 40 degree swings are a way of life here.
LT Hutchins gotta love the 93* and humid days
Here I am way up here at 6500+ ft elevation, y'all sea level fuckers should be happy with your car's performance lol
Thanks for the video, more people need to hear & understand this, temperature & DA as well as your elevation matters.
bottom line. air molecules are closer together on a cool day. my vortech ran like shit on a hot day. my tuner told me not to beat on it on hot humid days. cool nights were a different story.
So the reason my car is running slower after I get it tuned is the weather? It doesn't take a half of a year to tune a car. If it runs one way, then you get it tuned and a few days later it's running slower, how can the weather be the reason?
Cold air is denser which means more power, kind of like boost just means denser air
Still repping the vmp shirt, what a guy!
Thanks Alex. This is the kind of informations i like to ear
Nothing wrong with these videos very informative
GREAT video! Question! my 2000 GT after two years of having these exact symptoms that you are describing I noticed that the ECU had a "tune" because someone remove the plastic cover of the chip slot in the ECU and the connectors were a bit sand it (for better contact). My question is" There is no chip in the ECU since I bought it and it runs like crap when the weather goes or pass the 50's (spring and summer) What can I do? Can the dealer re flash it? The car came with a Borla Touring's, it has Steeda CAI and BBK X pipes. Should I buy a tuner or buy a new ECU? I heard that if the tune wasn't delete or unmarried then you cannot re flash the ECU even trying to disconnect the battery for half a day. Thanks!!!
Ur videos are so informative.. Enjoy watching them.. Funny too🤣
It’s true ! When I drive my f150 in colder air it runs great but the moment it gets hot ass hell, it runs like crap compared to the colder air
Racing for 20 years? Not me, only been racing for 50 years. DA can be your best friend or worst enemy. I only lost 5 mph in 3,300' DA vs 1,200' DA . Must be my tuner's fault. A TVS does not like IAT of 130*.
My 2014 Stang is always sweet and barely uses gas at 70mph in the AM then going home WTF! I never knew this info till Alex made sense of it all.
GRACIAS TUS VIDEO ME HACEN DE MUCHA AYUDA ! GRACIAS POR TU BUEN TRAVAJO ! DE GRATIS
Great info. Easy to understand.
i live in south florida planning to get an auto gt with boltons but have came across some of your vids about heat and affecting the performance, do you recommend the roush cai over the jlt since roush has the cover ?
It’s funny cause if you work out side in the heat it’s harder to breath due to less dense air vs work in doors in the A/C it’s way easier to breath more dense air...and motors are air pumps after all.
Love the information and just subscribed.
Isn't that what the MAF (mass air flow sensor) is suppose to accommodate those ambient air temp changes for? If the tune knocks out the MAF then that makes sense; if it does not then yeah I would question it ;-)
I really like these videos felt like a 2 min vid
but aside from your ecm pulling timing because its hot. is there a way to tune for hotter weather that will do even better in cooler weather?
Reason why the mustang is “under rated” power wise. It’s an over all average. If you live in an area that’s humid you’ll fall on that lower power band compared to a guy who runs his car in ny in November
You are the best!💪.Thanks
What do you think about the chillerkiller, adding AC to your air intake"? I your running the AC anyways.
What kind of boost loss can be expected on an 03 cobra with 2.3 tvs at 5000ft elevation? With a 2.8 and stock lower car is seeing 15-16 psi. Thanks
Alex I need some advice. I’m ready to buy a supercharger kit for my 2012 gt but am completely undecided on which type or brand. If you were starting over on your old 11 gt , which one would you buy knowing what you know now.
Thanks. The videos are great. Keep em coming.
Manual? i'd still do vmp or a Paxton 2200
Alejandro Flores
my car is an auto. I’ve been leaning toward a vmp because they come with a tune. My car has long tubes and a boss manifold so I’m afraid the tune that comes with a Paxton/Vortech /Procharger won’t work with my setup.
Awesome explanation
sounds like the guys asking if they need a tune for axle backs LOL
Sad , You had to explain this .. explanation well said ..
@alejandro I have a 2002 ford lightning. I just replaced the motor with a new 5.4 2v long block from ford and rebuilt Eaton supercharger. Do you a custom tune I can use on a sct x4
this camera and its focus is tripping me out bro!
Alejandro looks like a mexican joe rogan
Nice explanation! Luckily I already had a general idea about air, elevation, temp affecting everything. So at the end when you were explaining being able to drive across the country on the same tune, I'm assuming that's where the knock sensors come in? We had our first *really* hot day yesterday (IAT was in the 130s) and my knock sensors were pulling a consistent 3* at anything over 50% throttle. Assuming that's the case and point to a certain degree of this video? Basically "Screw what you want to do, it's hot af i'm saving myself" :')
Good afternoon alex.is it a big no- no to go without a air 2 air intercooler w/turbo coyote on e85?
FOR EVERY THOUSAND FT UP OR DOWN IS ABOUT A TENTH OF A SECOND AND ONE MPH.
NO WAY! A performance tune would HAVE to be quicker! Jk. I trust you know your stuff. Man I hope I get hired on as an operator at a plant. I wanna buy a 2011 5.0 mustang, kona blue with black leather and a 5 speed manual. :)
This is seriously common sense
Knowledge is power bro...wait a minute.. an '07 Jeep SRT8 is power
Good stuff, as always.
Alex are you going to Palm Beach international raceway any time soon?
Thank you sir 💪
Hey Alex,
What's the typical power you get out of a fbo 2015 GT. I just ran at the track here in AZ and first time out went 13.1@109. Something in the tune seems off... Its tuned on e54 and put down 480/404 at local dyno 2 days prior. I'm really confused to the low MPH. Any help would be tremendous.
Thanks Joe
so pretty much if its summer time and you have your car tuned and its hot and inlet air temps are sensitive so temperatures then that bascally means sports cars are useless when its summer time?? makes sense because sports cars are made for TRACK USE ONLY... thats what they are purposely made for.... so pretty much to me it looks like if its summer time or spring then that means the car isnt going to run at its best. which in other words your going to be loosing horsepower and torque across the board because its going to be hot out and cars dont like hot air.