Are these to be expected if I just installed 370cc 300zx injectors and the ECU and MAFS remain stock? Or is this only something which may occur if the injectors are faulty or fouled?

Basically, I just installed them a day or so ago, and I have noted hesitation going from idle to WOT, or from pretty much anywhere between 2k and 4k rpm. Hesitation at the lower part of the band occurs when I am sitting still and revving the engine from idle while the car is in park (I have an auto). I have had slight hesitation issues since when I installed a 2.5" exhaust on my N/A Max; I had chalked these up to a lack of backpressure. Since installing the new injectors the issues seem to have amplified.

 

Your probably running rich. Real Rich !!!

-matt

 

yea..ur plugs are prolly shot and u need to tune it with somethign like a SAFC

 

Why are running 370cc on a NA setup?

 

Unless you're pulling major MAF V during WOT you're probably rich but when in closed loop, you should be fine..

 

I am installing my V1 in stages... and wanted to be sure the car was safe.

 

do you mean safe?

 

well if he had a fuel tuner it would also advance his timing....and 370cc out of a 95-96 300zx are plug and play...which is easier than messing with injector harnesses

 

Yea well it might have been better to wait till you install the blower. Any type of throttle with these injectors, your going to be really really rich. Get ready to start changing out plugs.

-matt

 

:, and I still don't get this satement. If you're worried about going lean N/A..

 

Phasing the parts of the install allows me to make sure that the integrity of the fuel lines/line connectors I have installed is fine among other things...


Well, I intended to install the entire supercharger this past weekend... however, putting in the new fuel rail and fuel pump took most of the weekend.

But yes, I am noting signs that the car is running VERY rich. I guess this weekend is do-or-die on the blower install... Going to pick up my piggyback today or tomorrow, I guess...

 

What piggyback are you using ??

Installing peices of the blower kit is a good idea so you dont do everything all at once, then find problem and have to sort everything out and back-track. However, thats good if your going to get the blower on right away. Like put the injectors in, then start the car. Then start the blower install. .Carefull you dont drive the car too much and wash your rings.

-matt

 

I understand that the Z32 injectors are plug and play, Im running them but even with the advanced timing there is no real need for the 370cc injectors if hes NA.

 

I have been debating over going with the SAFC-II or the E-Manage Blue. I know the SAFC-II can't actually control timing advance, but is more prevalent than the E-manage...

Any thoughts?

 

Why not just get the emange ultimate and call it a day ??

-matt

 

: Don't mess around, do it right the 1st time.

 

niether of those two choices will control timing directly.so go with eu

 

I would need someone able and willing to install and tune the damn thing for less than $500-$1000. You heard correctly, I have gotten these quotes for the EU installed and dyno-tuned on my '99...

 

go ahead and swap in the z32 maf and that will help some? Just my 2 cents

 

i agree...i dont want to run them just to advance timing...but i also dont want to push my stock injectors too hard either by bumping up Fuel Pressure unless u can tell me what percent of duty cycle stock injectors run at on stock fuel pressure


he could also just get it tuned with with SAFC or EU before the blower went in

 

Stock injectors are 240 cc
The 370 cc/min injectors provide 54% more fuel than the stock 240 cc/min injectors
If he plans on running with this setup NA he does need to adjust the FP somehow. Even when boosted he will still need something to tune his FP unless he goes with the JWT SC ecu.

 

Even worse, I have already installed a Walbro 255 lph...

I will simply alter my timetable for the s/c install and tune.

 

You better just not drive your car. You are going to ruin your motor.

Rich is better than lean, but still very bad.

-matt

 

Are you running the 255 without an fpr? Between the injectors and the fuel pump, you will definitely hurt your motor! It's pay now or pay later; do the EU and you will be happy, now and in the long run!!

 

well if he doesnt have a fuel tuning device he has to adjust pressure...but with a tuning device he can simply take out fuel for now....but i am asking you is the percent of duty cycle stock injectors in the 4th gen run at

 

You have search so you may or may not have seen this... Anyhow, it's a good read.

http://forums.maxima.org/showthread.php?t=202144

 

Im not sure what percentage of the duty duty cycle the A32 injectors run at on stock setups, but it appears they max out at around 250-260whp on boosted setups.
The OEM injectors flow rate should be plenty for an NA setup.