1jz leaning issues?

[tturnpaw]

Hi all, just had some questions about leaning out up towards the top of the rev range. Were talking like 5000-6500 rpms. Ive had the wideband calibrated and the gauge recalibrates itself every time its turned on or off. Running stock boost, with the Driftmotion afpr kit and bypass line, it will lean out up top (13.1-13.8) during wot. This car does have a mines ecu, but even after upping fuel pressure to 42psi same thing. Rich and good down low but up top really lean. It also has a walbro 255. Any thoughts?

 

[annoyingrob]

I blame the walbro.

you're running about 60psi of fuel pressure at full boost. The walbro doesn't flow that much at high pressures. I had the same problem with my car. I suggest a 2nd pump in-line.

 

[tturnpaw]

i also believe that. Im considering some dyno testing to monitor my fuel pressure up top at wot. Possibly tuning the mines. But i think an aeromotive a1000 is in my future. Thanks for the input.

 

[Andre]

i also believe that. Im considering some dyno testing to monitor my fuel pressure up top at wot. Possibly tuning the mines. But i think an aeromotive a1000 is in my future. Thanks for the input.

To much noise an a1000 pffff

twin walbro are just twin Mk4 denso pumps is fine

 

[kwnate]

Put a walbro in it. It's still on the stock NA pump. LOL...

 

[tturnpaw]

Put a walbro in it. It's still on the stock NA pump. LOL...

what are you haunting me? lol did you never notice it had huge leaning out issues?

 

[suprahero]

I'm on one walbro and I've never had problems with mine leaning out, but if it's on the stock pump like Kwnate saids then it makes more sense. Are you running stock injectors? How much boost are you making when it leans out?

 

[bigaaron]

If the 1jz is leaning, just put a block of wood between the intake and the shock tower.

 

[SupraStardom]

:rofl::rofl::rofl:

well id just put lowering springs on one side of the car to compensate... dam swap mounts

 

[suprahero]

You could also try putting more air in one of the front tires. That helps sometimes if it isn't leaning too badly.

 

[kwnate]

what are you haunting me?

Yes.

 

[tturnpaw]

I'm on one walbro and I've never had problems with mine leaning out, but if it's on the stock pump like Kwnate saids then it makes more sense. Are you running stock injectors? How much boost are you making when it leans out?

I didnt know this as nate had told me it was a walbro BEFORE i bought it....it explains everything. its only on 10lbs. stock everything.

If the 1jz is leaning, just put a block of wood between the intake and the shock tower.

lol well aaron, looks like i found the problem! jesus and of course nate says he never told me it was or wasnt a walbro. you got one ready to ship? ill call ya tomorrow. send another t shirt lol

Yes.

i hate you lol. sooo frustrating. i still swear you told me it was, and i never pulled the plate off until yesterday.

 

[jz*supra]

How much fuel pressure can walbros handle on a regular basis?

 

[annoyingrob]

How much fuel pressure can walbros handle on a regular basis?

They start dropping flow dramatically after 75psi.

The red line is 13.5v, blue is 12v. Stock wiring will run close to 21v, maybe less. Upgraded wiring will run the pump closer to 13.5v

You're running dual walbros aren't you? Tell me your injector size, and how much boost you're running, I'll calculate out for you if it's enough (duals probabl are).

 

[kwnate]

I didnt know this as nate had told me it was a walbro BEFORE i bought it....it explains everything. its only on 10lbs. stock everything.

i hate you lol. sooo frustrating. i still swear you told me it was, and i never pulled the plate off until yesterday.

Don't come on here and fucking lie I never told you there was a walbro in it. You pulled the plate off? To look at the fuel level sender? Do you know what you're talking about? My car wasn't for sale but you just had to have it. It was put together the way I had time to do and it was fine the way I had it for what I needed, There were no short cuts, just things I hadn't done yet. It's not a perfect car and was never presented as one. You looked the car over, drove it and bought it now its your problem. If you want to sell it back I'll gladly give you half of what you paid. It's too bad you couldn't just do it yourself but judging by your other two you couldn't fix I doubt you could've done it yourself. Have fun dropping the gas tank :biglaugh:

Don't call me anymore as I do not have any desire to talk to you, its your car that you wanted so god damn bad so fucking deal with it I don't have time to hold your hand.

 

[91T breezen']

:biglaugh:wned::: IJ. ::

 

[jz*supra]

I am running 680cc injectors. but rcts flowed them at 620-650 and the entered 600cc into the vpro. My car only run 10 psi for some reason. Im hopin he didnt miss the 8 and set my boost cut at 10 not 18. every time i hit 10 psi my car stuters, afr is usualy 12.5 or a touch higher. I have not lookin into the issue at all tho.

A walbro costs 100 bucks and a few hours to install. not a big deal realy.

 

[onejz]

Put a walbro in it. It's still on the stock NA pump. LOL...

STOCK LOL FTW

 

[upgradedsupra]

But i think an aeromotive a1000 is in my future.

An A1000 for that little power, isn't needed.

I didnt know this as nate had told me it was a walbro BEFORE i bought it....it explains everything. its only on 10lbs. stock everything. lol well aaron, looks like i found the problem! jesus and of course nate says he never told me it was or wasnt a walbro.

Nate is an honest guy and doesn't cut corners, just look at his Blue car. The white one does need a few small things but it ran like a beast when he had it. In this case, sometimes things should be left alone when you don't have a clue about cars. I knew and everyone else knew it was on an N/A pump and I believe he would have told you the same. Nate is that kind of guy.

i hate you lol. sooo frustrating. i still swear you told me it was, and i never pulled the plate off until yesterday.

Well it's time you did something and after all, you ended up buying a car that you didn't have to do much with. Minor things and that car was set and good to go for a long time. Nate called me when someone wanted to buy the car and when I found out it was you, I kinda laughed since I know some of the history from Nate. One being that you wanted to make a targa out of a hardtop.

Go ahead and tell me about the boost control now, I would love to hear this. I already have a response for you so make sure you are accurate in what you say first before responding though

PS: By the way you drove in Centralia, I'm surprised that you haven't crashed that yet.

Ok, I'm done.
Duane

 

[annoyingrob]

I am running 680cc injectors. but rcts flowed them at 620-650 and the entered 600cc into the vpro. My car only run 10 psi for some reason. Im hopin he didnt miss the 8 and set my boost cut at 10 not 18. every time i hit 10 psi my car stuters, afr is usualy 12.5 or a touch higher. I have not lookin into the issue at all tho.

A walbro costs 100 bucks and a few hours to install. not a big deal realy.

Sounds like plug gap more than anything. Make absolutely sure your coil pack connectors aren't cracked and missing their locking clips too.


Oops, I mis-read the above chart. red is 13.5v, blue is 12v for the same pump.

600cc/min * 6 injectors * 60 mins / 1000cc/l = 216 L/h = 57gal/h @ 100% duty cycle.

assuming you're running a base fuel pressure of 40psi, and 10psi of boost, that's 50psi of fuel pressure. At 50psi, the walbro flows about 54gal/h, so you're close with one pump. Assuming you're not maxing out the injectors, you'll be fine.

However, if you want to run more than 10psi of boost, you're going to run into fuel issues with just one walbro.

For people running stock lines, add another 5psi or so of pressure drop within the lines due to their small diameter.