Have a 1997 Maxima with 370cc Injectors and JWT ECU used to control said Injectors.

I get a "Phantom Code" 1005 with the JWT ECU <not a CEL, but if you check, it's there - even after a reset it's there>.

How can I pass emmissions? <In WA, they check your car with an ODBII Scanner>

Here's my idea:
1) Remove SC Belt and put stock belt on.
2) Put stock ECU in.
3) Install FPR, tune FP to xPSI at idle <anyone know what it should be??>

Would this work?

 

It sounds like your screwed.
I live in cali so I know the pain.
I can't add anymore mods until I pass emissions.

Your plan sounds good but you over looking the injectors. No matter what ECU you have the injectors are still pumping 370cc. That's going to make your car run really rich. Even if you adjust the psi of the Fpr. Check local laws maybe there is a loop hole. But it looks like if you replace your fuel rail(injectors,FPR) with the stock one it might work.

Hope it all works out!

 

do you guys do dyno-smog like Cali peeps?

according to my calculation by using RC eng's forumla. you should idle fine with 14 psi of fuel with 370cc injectors.

this is the formula:



I use 370cc for the old flow rate and 240cc for the new flow rate.

 

I thought many people were running the 370cc Injectors using the FPR and tuning it just fine.
No offense, but I think you're wrong Drjmaxx88.

I thought it was more like 23PSI from reading old posts of people who used the FPR to tune the 370cc Injectors. Hmmm.

Maybe someone who's done it can answer.

IanS

 

we got a guy here, 4th gen SC'ed with 370cc injector and FPR to 20-23 psi at idle. He is detonating at higher rpms, so just don't hit boost on your way to the smog.

I believe stock injector idle is 43 psi

 

Since I do not have my SC in yet, I am running like your idea of:
1) Remove SC Belt and put stock belt on.
2) Put stock ECU in.
3) Install FPR, tune FP to xPSI at idle <anyone know what it should be??>

I will look thru my posts, but I did post what lower PSI I am using now with my 370s, a32 ecu, and a32 maf. I do not get a CES light, but I have not tried to pull any codes.

 

I think it was your post I read before, Prodeje.

I don't see why it would throw any codes with a FPR@xPSI and the 370cc Injectors with the stock ECU. In theory, I think - as far as the ECU sees, everything would be working correctly.

IanS

 

OK i found this long thread:
http://forums.maxima.org/showthread.php?t=263228
At the end I say I use stock FP, but I ended up having problems. WHich leaves this thread: http://forums.maxima.org/showthread.php?t=294882
It does not clearly state what I used, but I was afraid to use the calcualted 14psi and used like 27/28 PSI.

FOUND IT POST 25! http://forums.maxima.org/showthread.php?t=301303

another related thread: http://forums.maxima.org/showthread.php?t=300976

nice pics of FPR install: http://forums.maxima.org/showthread.php?t=306280

 

guys, just trying to clarify. 14psi FPR might not be good for boosting. running 14 psi of fuel is to match the fuel delivery of stock 4th gen maxima. That way, you are not running too rich and you will have more chance passing emission. people use 23psi because they need high base fuel pressure to get high peak fuel pressure from their FMU.

Ion,
what dont you just try to lower the FP and see if your car can idle fine. what worse could happen? if the's not enough fuel, it will just shut off the engine. if the engine dies, raise the fuel pressure and try it again until you get a FP reading and your engine wont die from fuel starvation.

 

The plan is however to run off the stock belt completely and not boost with this setup.

When I'm done, I'll put the FP back to 40PSI, which is where it sits now.

As long as I can make the Fuel Map around 13:1 from 0-3500RPM, I should be OK I think. So the question lies in what PSI shoudl I run to achieve this? 14PSI sounds like what I'd look for - correct?

(Sorry if I'm repeating here - but I want to be clear.).

Like suggessted, I could just let the car idle and test different PSI's. The problem is that they test our cars at 3k RPM on the pipe. (If they use the pipe - I'm now hearing some palces do, some places don't).

IanS

 

I hope I am wrong. I hope it passes. Let us know how it goes. Hell if you pass maybe there is hope for us californians.

 

Well - worst comes to worst - I can put the stock Injectors back in.

IanS

 

if my calculation is correct, 14psi should get your 370cc injectors to flow 240cc per minute, which is equivalent to stock 4th gen maxima.



btw, I dunno if getting rid off the belt will help. your JWT ECU is programmed to run with SC and the fuel delivery is fixed and not boost referenced. The ECU will always assume that you have a SC there and always increase the fuel delivery for it.

 

IIRC, he's going to put the stock ECU back in from our discussions we had about it.

Also Ian, from the last time I ran on the dyno for emissions, they get the motor up to about 2k-2500rpm tops, to similate normal crusing...but that's if they have you test the pipe. State keep changing how they do testing so much that it'd be a miracle if we actually knew before hand how they will test the car.

I really don't think you need to put the stock injectors back in. Just doing what you mention should work.....and you get 2 chances before they slap you with a requirement to have it repaired a state authorized shop before you can test again IIRC.

S

 

They didnt take my car past 1800 when I took it in a few months ago. I saw it on the screen.
There are some local shops that will do emissions tests free. It's not the actual test but they will let you know if you will pass or not. I've never done it but I know about them.

Also if you guys have an OBD-II reader you will know instantly if you pass/fail. Just look up the limits online.


edit: heres my sheet

 

We don't have emissions testing yet here in Austin, so correct me if I'm wrong, but testing is done 1) at idle and 2) with the engine at a constant higher rpm, simulating cruising with the ecu in closed loop mode.

If that is indeed the case in WA, then you can use your stock ecu and the Z32 maf, base fuel pressure unchanged from oem values. The combination of the Z32 maf and 370 cc/min injectors is within the ecu's range of correctibility when in closed loop mode. I did some testing with this setup earlier this year and my wide band O2 sensor showed stoichiometric afr while cruising. It's only at WOT and in higher rpm that it leaned out a bit too much.

 

what A/F ratio is stock for our cars? what ratio would easily pass emissions?

 

Ratios don't matter so much for me. In WA if your car is a 96+ (ODBII) - they don't check the A/F ratios - they just check for codes.

On the other hand - if hte car is running rally rich and they can smell it when I drive up - they wouldn't pass me either.

I think 13:5 or something like that is stock A/F - when you start boosting, you have to richen it up to 12.5:1 or even 11.5:1 to add safety.

I passed at 12.1:1 with the SC 2 years ago. Then again - I wasn't boosting at 2000RPM where they test - so my A/F was stock anyway because the FMU wasn't foing anything.

 

As Stephen Max has said/proven, use your stock ECU, install your Z32 MAF, and don't go WOT.

Or since you're having problems with that setup, just run "A32 MAF + 370cc program running and the A32 MAF hooked up, the car runs fine, but leans out up top.".

 

Like I said:
"A32 MAF + 370cc program running and the A32 MAF hooked up, the car runs fine"

But I get a 1005 Code because of the A32 370cc SC Programmed JWT ECU. They check codes in my state first. So I would fail.

Otherwise I wouldn't bother even messing with it - I'd just drive down there and take the test. SC's aren't emmissions illegal. That's not the problem.

But if the Z32 MAF works with the stock ECU and 370cc Injectors installed - perfect.

 

I'm going to give this a shot this weekend.

Using the Z32 MAF + Stock ECU on top of the 370cc's.

I'll post how things turn out.

IanS