1JZ running rich at Boost (D/M 57 trim single turbo with SAFC,440's) can't lean out

[Mrfairlady]

I'm running a 1JZ/R154 with Driftmotions 57 trim Turbo kit,JDM 2JZ 440's and Stock ECU with SAFC.

It runs Great and No problems at all except I'm pulling Fuel on the SAFC to the max (-23) on just about all Rpm's up to redline to Lean this thing out.
It Will also only go about 11-12psi w/ a 15lb wastegate Spring,with MBC set to Wide open.holds Boost Fine just not enough.

Are the JDM 440's Overkill and Why Pulling so much Fuel does it still run pig rich. 10's all the way across to redline on my wideband. No Boost Cut or anything even that rich.
Should the SAFC be leaning this thing out more?
Its def working as I can adjust it at Idle and it changes A/R's perfectly.

any Ideas? Lower Fuel Pressure below Stock?
I would think the SAFC should be fine for Mild tuning.I'm not looking for 1000hp or go standalone, just it should be way faster than this.It falls on its face at Boost.:: angry ::

 

[IBoughtASupra]

440CC * 84% = 369.6CC, you should be pulling 14% to allow for your ECU to act as if it was on 370CC. You have another problem. Put the original 370CC injectors in and see what happens.

 

[Mrfairlady]

Yes I believe I do.
Now, I'm running a aeromotive FPR with D/Motions hardline fuel kit,A walbro and the Fuel Pump ECU has Been Bypassed to run Full 12v like the Supra. (car is a SC400 BTW)

Now,..With a rising rate FPR..Is that my Issue. I'm running Stock Pressure.
No Clue on why it would Be running SO good except when I Floor it,Boost Comes on and Its rich as hell.

I will say the car when Cranking seems like its flooded or,gets Easily flooded. You can Only turn the key Quick Turns and It will sometimes fire right up.
If you Roll it over a bunch It Takes a while for it to Crank. That's about the only Quirk It has. Thought it was the 440's combined w/ Lightweight Flywheel. maybe not.

 

[mk3tattoos]

Your fpr is a tuning device, back it down a bit and try a test run, if it helps then try and find a good balance with that and the safc. You might want to check your plugs to make sure there not fouled out.

You can always take it to a pro and have it tuned the right way.

 

[IBoughtASupra]

You are dumping fuel. Put the stock 370CC back in and see what happends at idle and boost.

 

[Mrfairlady]

Looks like I may Have to. I dread Pulling that mani to Do it. What a Nightmare of vac lines and Shxt!.

So the 440's Overkill for this set up .Stock injectors be ok?
I was aiming for around 360-400whp with my setup which should be Doable I would think.
No easy Way to Swap injectors with JZ engines is there?

 

[mk3tattoos]

I pulled out my fuel rail with out removing the manifold.
Just take off everything above the injectors, and remove the TB, then you just need to pull out the fuel rail.

I don't see why there is a problem running 440, many people do it with stock twins, especially when aiming for 400hp. To reach that you need to turn up the boost, and to turn up the boost you need more fuel!

 

[destrux]

If you're running a rising rate regulator, that's your problem. You should be running a non-rising rate (1:1) regulator set to near stock fuel pressure (measure fuel pressure with the vacuum disconnected at idle).

You'll need the 440's for the power level you're planning to run. You probably will need bigger than 440's actually.

 

[mk3tattoos]

If you're running a rising rate regulator, that's your problem. You should be running a non-rising rate (1:1) regulator set to near stock fuel pressure (measure fuel pressure with the vacuum disconnected at idle).

You'll need the 440's for the power level you're planning to run. You probably will need bigger than 440's actually.

Good call, I missed that he said he is using a raising rate. That is the problem!!!!

 

[mk3tattoos]

I wonder what ever happen to this guy,try and help out and then........nothing! Soany threads end just like this one.

 

[Mrfairlady]

I'm here.
Been trying a few things suggested by Aaron and I def had the Static Fuel Pressure too high. backed it down and Now i think I have it where it supposed to be.It hits 11.3-4 at full boost but just not nearly as fast as I'd hoped it would be.My Nissan Would Demolish This car.

Only thing is My boost will only hit 12psi.
Its got a 12lb spring in the wastegate and my hallman MBC has no effect on adjustment + or - it seems.Trying to hit 15 or 17psi.
I made sure its hooked up correctly but something else is going on.It was brand new when installed so thats my Final issue.

 

[mk3tattoos]

That's good to hear! Guess you had the right afpr? I thought you said you had a 15lbs wastegate spring.... I have Perrin and it works realy good, some of them are not so good though. You might have a boost leak some were.

 

[OneJArpus]

15lb spring and your only seeing 11-12's? I'd first diagnose why you aren't getting the proper PSI. I don't think the BC would allow you to go below 15 psi spring on the wastegate.

I say fix that then start tuning....