3.0L with stock EFI

[fl327]

im pretty certain it will, but that stock efi may hold you back from realizing the 3.0 performance potential, you may get away with a bigger pump and a rising rate fuel regulator.

[z-ya]

I'm planning a 3.0L L28 build and wanted to know if anyone has done this utilizing the stock EFI setup. Can the stock 1978 280Z EFI system provide enough fuel for a 3.0L with a stock cam and 8.8:1 CR?

 

Are there any mods I need to do to keep it from running lean, and getting the most power out of it?

 

Thanks,

 

Pete

[Cody 82 ZXT]

I think you could get the project started but, I would at least put an adjustable FPR on it so you could up the pressure a hair if the car liked it. Theres always the small adjustment you can do with the AFM but, let me cauation you to make sure you do small changes and mark your begginning point so you'll have a place of reference. You may eventually find that going to turbo injectors with less fuel pressure may be your ticket. I would change to a SDS or something like that where you could tune it to get every last HP when time and money permit. I'm sure the drivablity would vastly inprove also. Really a powerful car is great but, one that just flat drives well and is fast is even better.

 

Keep us updated.

[Guest Zcarsmakemyheadhurt]

Fuel is everything spend the money on a real kick ass fuel computer and leave a stock turbo motor if you must, you can only make as much horsepower as your fuel supply will allow you.

[Guest Anonymous]

you know this one is on my drawing board

turbo injectors

good fuel pump and adjustable Fuel Pressure Regulator

60 mm Throttlebody

( im going twin 47 mm )

i say no N42 intake less its turbo

"do what you will"

if its not a turbo you can take the circuit bord out of a NA AFM and put it into a turbo AFM

this gives you more air and fuel

as you will find Ken Jones 3.1 from Z Sport mag

a uni-light with base timing of 16 and max of 34 to 36 covers your timing

pluse adds 10 hp

no the Z Sport mag i speak of is not out

so you have time to subscribe if you dont get it yet

 

good luck

 

[Lockjaw]

Actually, I am thinking of injecting my 2.8 in my 260, but I was thinking of using the 300ZX set up since we have some folks on the board who have converted the turbo EFI to work on their turbo L engines.

 

I think that would be a far better method, plus I could get JWT to mod the ecu at that point, if I wanted to do that.

 

Yo2001 has swapped the circuit board in the NA AFM to a turbo one, and it seems to work ok.

 

I like my su's sometimes, but with this cam I am running, and having to use the choke everytime I start it, plus trying to get the mixture right, I think I could fuel inject it and probably gain power, plus I could run ac, and actually raise the idle when the compressor kicked on. Imagine that.

[z-ya]

I picked up a F54 280ZX motor with flat tops, and I have an N47 head, so I think I'm going to do the cheaper route for the 78'. I figure a 9.8:1 L28 should put out as much as a 8.8:1 3.1L. I plan on running the stock injectors, with an adjustable FPR. If I feel that it is leaning out at high RPMs, I may go with a turbo pump, and or turbo injectors. I think the turbo injectors would be too much though. BTW, I have a freind who races a 280Z ITS car, and I've seen it put 150HP to the wheels runnig just a header, and the stock FI. Not bad for a stock 78' l28 with an N47 head and stock fuel injection.

 

Pete

[Lockjaw]

Topend says to use the cold start injector as a suplemental fuel adder, and to use the turbo injectors, and swap in a BMW AFM.

 

Personally, I am not going to mess with the afm door deal, I want an MAF, or I will stay carb'd.