Bad maf??

[Kayo Stanciu]

Having somewhat of a head scratcher.. my car is having a bogging issue when at WOT.. I checked for boost leaks already and I have none, spark plugs are new and gapped at .28, and the wires are also about a month maybe a little more old. CEL is on for fuel trim but not sure where to start on that.. any ideas on what it can be.. it drives fine if I slowly build up speed til about 4 1/2k-5k Rpms or if I step on it the car just feels like it hit a wall and bogs once again a boost leak test was performed and nothing was leaking..had a for installed and it’s set at 50psi I have 550 RC injectors and a 255 walbro pump. My AF ratio is all over the place jumping from 10-16.. on my apexi safc the karman reads roughly around 300-380hz cruising and when get on the throttle a bit more is around 650ish.. anybody else have this problem? So s BLT was done and there were no leaks but the bov one I had found but I fixed that and r checked it and had no more after that.
Also my mpg is real shit took quarter of a tank at 47 miles on it
Car is manual

 

[pauleyman]

Youre dumping fuel, hence the fuel trim cel. What are your settings on the safce? Your fuel pressure is too high.

 

[chrysler kid]

You can't adjust enough on the safc to run 550 fuel injectors. You're bogging the hell out of the car.

You need to have a tune done, the AFC can trick the ECU to change fuel settings, but it can't calibrate fuel trims enough to adjust for the extra capacity.

So if you have a wideband and are using an AFC to adjust fuel settings you're gonna have a bad time

 

[Kayo Stanciu]

Youre dumping fuel, hence the fuel trim cel. What are your settings on the safce? Your fuel pressure is too high.

What should the pressure be at?

 

[Kayo Stanciu]

You can't adjust enough on the safc to run 550 fuel injectors. You're bogging the hell out of the car.

You need to have a tune done, the AFC can trick the ECU to change fuel settings, but it can't calibrate fuel trims enough to adjust for the extra capacity.

So if you have a wideband and are using an AFC to adjust fuel settings you're gonna have a bad time

Well it was working until I had that boost leak at the bov but also had a for installed before it was located. So idk if maybe that is the problem because it ran good before the bov leak and fpr install

 

[pauleyman]

What should the pressure be at?

I' have to look it up bit I think base is 43....quick search should get you the answer. It's different for 1 and 2g

 

[Brembo]

43 for 2g and 37 for 1g

 

[chrysler kid]

You set the base pressure with the vacuum line for the fpr unhooked at 43psi, when you attach the nipple to vacuum it should drop down to 37psi at idle or so

 

[Vegas Smith]

1) set fuel pressure
2) turbo too small
3) not enough nos
4) recalibrate wideband

 

[Kayo Stanciu]

43 for 2g and 37 for 1g

I have a six bolt so then it should be set at 37?

 

[Kayo Stanciu]

1) set fuel pressure
2) turbo too small
3) not enough nos
4) recalibrate wideband

I have a 16g turbo so I don’t think it’s too small

 

[chrysler kid]

I have a six bolt so then it should be set at 37?

Is it a 1g cylinder head or 2g head?

 

[Kayo Stanciu]

Is it a 1g cylinder head or 2g head?

1g

 

[techboy]

I don't think it has anything to do with the SAFC ... I run a SAFC with 650's on a tune and car runs awesome. As said above, you have too much fuel bogging the car. 50 is way over. If it's a 1G head 6-bolt swap it would be 37psi. You should notice a huge difference with that one adjustment. Are you getting black exhaust gas or a backfire?

 

[pauleyman]

I have a six bolt so then it should be set at 37?

No. You have a 2g car and 2g computer. Ecu doesn't know you have a 6 bolt.

 

[pauleyman]

Is it a 1g cylinder head or 2g head?

I'm curious why this would matter.

 

[Brembo]

1) set fuel pressure
2) turbo too small
3) not enough nos
4) recalibrate wideband

That's funny.

I have a six bolt so then it should be set at 37?

You have to set it to the ecu that you are using. If it is 2g then to 43.

 

[Brembo]

No. You have a 2g car and 2g computer. Ecu doesn't know you have a 6 bolt.

This man speaks the truth.

 

[Kayo Stanciu]

I don't think it has anything to do with the SAFC ... I run a SAFC with 650's on a tune and car runs awesome. As said above, you have too much fuel bogging the car. 50 is way over. If it's a 1G head 6-bolt swap it would be 37psi. You should notice a huge difference with that one adjustment. Are you getting black exhaust gas or a backfire?

I’ll tune it down to 37 psi and give that a shot. And no black smoke or backfiring just bogging

 

[Kayo Stanciu]

Hoping it’s the fuel pressure I’ll try it at 37 and 43 and see what works best.. but 57 miles on the tank and half of it is gone so mpg are rea crappy

 

[pauleyman]

Hoping it’s the fuel pressure I’ll try it at 37 and 43 and see what works best.. but 57 miles on the tank and half of it is gone so mpg are rea crappy

43. Period.

 

[techboy]

Were you able to mess with it today? How'd you make out?

 

[Kayo Stanciu]

Were you able to mess with it today? How'd you make out?

Haven’t got a chance, sucks not having a garage it’s been like wizard of oz windy where I live. But today going out there for sure. But too high of fp would cause it to bog under boost?

 

[Brembo]

I am not sure. Would need to check fuel trims and wideband at wot to see if it is fuel related or not. In my personal experiance I had severe hesitation at wot on my stock 2g back like ten years ago and it turned out to be Bosch plugs that someone installed. Switch to ngk and I became a believer. In your situation I would start by ruling basic things out first. You need a scanner or ecmlink for that. Good luck and let us know what fixed it.

 

[Kayo Stanciu]

I am not sure. Would need to check fuel trims and wideband at wot to see if it is fuel related or not. In my personal experiance I had severe hesitation at wot on my stock 2g back like ten years ago and it turned out to be Bosch plugs that someone installed. Switch to ngk and I became a believer. In your situation I would start by ruling basic things out first. You need a scanner or ecmlink for that. Good luck and let us know what fixed it.

The plugs are only like a month and a half old I just got new NGk ones, my plugs are gapped at .028 bpr6es, a/f is roughly around 15-17 sometimes at 10. And did blt at 20psi found no leaks.. saving up to buy ECMLink