1979 280ZX Intake & Exhaust Upgrades
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- čas přidán 29. 07. 2024
- First round of mods on the ol '79. The secret to unlocking power on an EFI L28 is to port out the intake manifold, and add a decent set of headers. That's just what I did.
- Auta a dopravní prostředky
Heat shields are a drag. I've owned 4 and currently just found a hard top! It came with a snapped exhaust bolt in the head so to work I go. With that, the heat shield is not nor has ever gone back in on any z I've owned or the few my buddies have had and that EGR tube can kick rocks! I've snapped them all until this new one I have.. little bp blaster before bed, came right off in the morning lol. Keep up the hard work! Enjoying the content so far.
full send bro never lift! mobbin deep! love the song it's an 80vibes therapeutic video I'm putting stainless steel on mine rebuilding soon!
Been a while since you posted the 280zx😁
Had a 81 with msa..didn’t like the sound, put pacesetter headers on my 79..sounds amazing.
LMAO, was just gonna send you the video
A 98 ish Nissan Altima throttle body will bolt on but is I think 40-45 mm cheap junkyard upgrade I forgot what I had to hook it up to stock ball n socket linkage but wasn't to crazy
And you should put that Heat shield back exhaust heat on the bottom of intake is not good
welcome
I want to transfer it to Kuwait, what is the way?
Hey, hopefully you can answer a question for me. I have a 1981 280zx (NA). It’s got a F54 block with a N42 head. It’s got an exhaust manifold leak and I would like to replace it with a header. Is there a header (square port) that will fit the 81 keeping all emission plugs?
The MSA header (exact one im using) has a version for '75-'76 engines (Factory N42 head) that has an EGR fitting, but no O2 sensor fitting. Your best bet would probably be to buy that one, buy an o2 sensor bung separately hand have it welded in to the cylinder 2 exhaust runner. Any exhaust shop would be able to do that.
@@HooliganGarage-650 so I finally got around to removing my manifold. Turns out that I don’t have an O2 sensor, I guess someone deleted it at some point? Is that possible? The manifold that came off says F54 on it and has square ports as well.
@@dexterstanley4185 Thats strange, all '81 and up should be equipped with an O2 sensor. Is there a plug in the harness anywhere for one? It would be a single terminal connector with a round rubber grommet.
@@HooliganGarage-650 No, there is no plug on the harness. There’s no bung on the manifold either.
👍❤️
What kind of power increase do you think you got with that manifold and exhaust work?
Great video
Thanks! Somewhere around 15whp. I shaved about a full second off of my 0-60 time. I've got a video comparing the results before and after.
I’m surprised you were able to take the intake manifold off with the fuel rail. Any issues without the heat shield?
Haven't noticed any heat soak without that shield. You might experience some if you remove it while still utilizing the stock large iron exhaust manifold though.
Nice job, I have a 1978 Datsun 280z 2+2 5speed I would like to do this headers and intake manifold and a cold air intake. Where did you buy your parts from Motorsport
The headers were from Motorsport, however the manifold was a custom job performed by a machine shop in my area.
you going to stick an n42 head on it or just build the p79 head? Im assuming its an f54 block with flat top pistons
'79's come with N47 heads actually, and dished pistons. I'm thinking of a mind street cam with some shaving down the road..
@@HooliganGarage-650 very nice. I have an 81 and i have a lead on an n42 head that im heavily considering on getting
I am in the process of building a second 280z that I plan to drive a lot. I live in California and have been looking at ways to increase performance on the stock EFI system but also pass California Smog. The modification you did with the intake manifold and porting the runners, will that pass the sniffer test out here?
The porting of the manifold is totally undetectable from smog testing in both the visual and exhaust emissions test. However, to get the most out of this extra air, you'll need to adjust your AFM to allow a touch of extra fuel under load. This would need to be adjusted back to stock for the test, or it will read rich at the tailpipe.
@@HooliganGarage-650 Thanks for the response! Looks like I will be going this route. Already have a port and polish job waiting for the head along with a full engine rebuild. Trying to stay smog legal but increase the power as much as possible which I know is very limited with the stock EFI. Did the car run negatively without adjusting the afm?
@@AnthonyCessor It ran totally fine without the adjustment with a very noticeable power increase above 4500 RPM. I adjusted the AFM wheel about three teeth counter-clockwise and I noticed an increase in low end torque.
@@HooliganGarage-650 Thanks for the response. Sounds like I will have to do this in combination with port and polishing the head.
@@AnthonyCessor My manifold was matched to the ports on the head. Stock head ports are 34.5mm, and the manifold runners are 29mm. Bring a fresh manifold gasket with you to the machine shop so they can use that to reference from. However, I would only recommend porting the head if you are going to be running a competitive camshaft with higher compression.
I’m interested I sending my intake manifold to a machine shop I know you said you had it fully ported through the runners to 34.5 mm and 60 mm on the plenum? I’m very new to this and is this what I would ask them to do or is there a better way to say it?
The first step would be to buy the intake manifold gasket for the shop to use as a reference (Each port on the gasket is 34.5mm) and tell them to extrude port the runners to match the size of this gasket. This will involve cutting open the plenum to port the runners all the way through, and then welding it back up. Then instruct them to port the plenum opening (where it meets the throttle body) to 60mm.
hmm didnt know about that, the intake manifold. how much did it cost you for the port
It was highway robbery. $700. I made the mistake of taking it to a shop that specializes in V8's. Its California, everything car related is more expensive here anyway.
What shop are you using? I’m in the South Bay, so I’m pretty sure I’m close by
I'm in the North Bay, I used Rescino Performance for the porting work.
My idle on this same car sounds like it wants to die at a red light it also struggles when I try and speed up what screw are you talking about
There's a large sprung screw on the top of the throttle body. This is what sets your idle speed.
You went to all the work on the intake manifold and used the stick throttle body??
The stock intake manifold breathes just fine. It’s the throttle body that’s the issue. The stock intake manifold will easily support 400hp++
It's the opposite actually. The stock throttle body flows ok, but the manifold is extremely restrictive. Each runner is 56% the surface area of the intake valve, and is 6mm undersized from the ports on the cylinder head. Many users have tested this theory on HybridZ and Chruch of L series by putting 60mm+ sized throttle bodies on their stock manifolds and seeing zero difference on the dyno. Check my latest video, my 0-60 time improved drastically after this mod.
@@HooliganGarage-650 they see zero benefit because they need better cam to take advantage of the increased air flow. Most people that use the 240sx throttle body see a major improvement.
@@HooliganGarage-650 I have my intake opening ported to 60mm and am running the 240sx/Altima throttlebody that’s also 60mm, and I’ve also shaved off the casting bumps in each intake runner for a tiny bit more flow but it’s a healthy noticeable difference just shaved those bumps that the factory needed as reinforcement to tap the injector screw threads. While I don’t doubt your full porting yields more horsepower than the what the stock intake flows but the Throttlebody is absolutely a restriction.
I have measured each opening before the intake and once the intake is ported to 60mm and using the 60mm Throttlebody; there will be a good difference in how fast you’re going; wether this is because you’re letting more in sooner as the bigger throttle plate opens OR because of actual hp gains; or could be a combination of both along with the power band being altered due to the restriction being simply moved to a different spot. That would be the NA AFM. You’d also want to swap over to the turbo AFM that I believe is a 65mm opening to fully open up that intake; with all that done and a proper cam that’s gonna be MUCH quicker. My point being yes the stock TB is restrictive, not to mention cluttering and that BCDD system is the equivalent to modern car rev lag; used to keep the tb slightly open when you let off the throttle so the fuel can be fully burnt. This will never show up on a test since they only test idle and this isn’t visually in direct sight. It makes it easier to drive like a grandpa though.
Lots of decisions to make and opinions depending on who you want to listen to
how many miles are on your zx
This one had 108,000
California is "RESTRICTING"
bro u just buying them and fixing them for the fk of it lol like car crack problem lol jk