2g MAF screw

[1FASTRICE]

I had my car tuned recently and it required my safc to be put in the -40's. With that being pretty much maxed out, and my car still running on the rich side (hints of black smoke under load), would it be ok to back out the maf screw to lean it out a little bit. I wanted to go this route before DSMLink in the future.

 

[GVR4592]

There's no reason for your corrections to be in the -40's with 550 injectors. They should be around -20. Have you done a boost leak test, checked fuel pressure, or anything like that?

 

[1FASTRICE]

I have fic 750's with an agp 50 trim turbo... the guy wont tune with boost leaks and stuff like that... Its Innovatve Tuning out of western NY.. the best around

 

[GVR4592]

You should update your profile. You shouldn't play with the screw if the tuning is already done. If you think it's running rich, take it back and have them check it out.

 

[1FASTRICE]

He knows im still a lil on the rich side but cant really tune the afc anymore.. I guess hes keeping the motor "on the safe side"

 

[oldman]

Don't hack or play with the screw on a 2G mas, it won't read correctly. SAFC with 750s? What does your timing look like? I don't care what the guy said, perform a boost leak test.

 

[1FASTRICE]

I believe he said my timing is probably advanced alot.. which is causing my aftermarket overflow bottle to fill when the car is being beat on so to speak and the car run hot.. coolant wise.. can it be retarded solely by the cam sensor?

 

[oldman]

I believe he said my timing is probably advanced alot.. which is causing my aftermarket overflow bottle to fill when the car is being beat on so to speak and the car run hot.. coolant wise.. can it be retarded solely by the cam sensor?

Your injectors are too big for a piggy back system, are you telling us you don't have a logger? Do you have an AFPR? Fuel pump?

 

[GVR4592]

He knows im still a lil on the rich side but cant really tune the afc anymore.. I guess hes keeping the motor "on the safe side"

Do you have an adjustable fuel pressure regulator?

 

[1FASTRICE]

I guess im gonna get the dsmlink and walbro 255 this week. I see where this is going..

 

[oldman]

I guess im gonna get the dsmlink and walbro 255 this week. I see where this is going..

What Luke and I are trying to tell you is if you had an AFPR, you would be able to drop your fuel pressure and make your 750s smaller but since you don't have a logger, you will have to pay them more money for a re-tune so you might as well save that money and do it right.

I also find it some what comical that your tuner said he won't tune with boost leaks but he would tune 750s with a SAFC and leave you in the state you're in, without an upgraded fuel pump no less. Also keep in mind that you will need an AFPR with the 255.

 

[1FASTRICE]

Don't hack or play with the screw on a 2G mas, it won't read correctly. SAFC with 750s? What does your timing look like? I don't care what the guy said, perform a boost leak test.

My timing at idle is advanced 11-12 degrees and 29 degrees when revved up to about 5 grand

 

[oldman]

My timing at idle is advanced 11-12 degrees and 29 degrees when revved up to about 5 grand

So you do have a logger? I'm more interested in your timing under WOT.

 

[1FASTRICE]

No, I dont have a logger. Say I get someone to log it for me, what should it be at when WOT and how do I correct it if its too advanced?

 

[oldman]

No, I dont have a logger.

Then how do you know your timing is at 11-12 @ idle and 29 revved to 5K?

Say I get someone to log it for me, what should it be at when WOT and how do I correct it if its too advanced?

You can't, the reason your timing is way advanced is because you're taking way too much air out (lying to the ECU) in order to compensate for the 750s, reason why 650-680 is about as big as you should go using a piggy back tuning device like the SAFC.

 

[dsm-onster]

I believe he said my timing is probably advanced alot.. which is causing my aftermarket overflow bottle to fill when the car is being beat on so to speak and the car run hot.. coolant wise.. can it be retarded solely by the cam sensor?

This sounds like a head gasket leak. . . I'd keep monitoring your coolant temps, and Run a warm compression check if I were you. . . A symptom of ALOT of timing caused by the BIG injectors, for an safc.

 

[1FASTRICE]

This sounds like a head gasket leak. . . I'd keep monitoring your coolant temps, and Run a warm compression check if I were you. . . A symptom of ALOT of timing caused by the BIG injectors, for an safc.

My compression was strong across the board and a leak down test showed 1% in 2 cylinders and 4% in the other 2.

I had a snap-on hand held computer hooked up to my car to check the timing.

 

[oldman]

My compression was strong across the board and a leak down test showed 1% in 2 cylinders and 4% in the other 2.

When was that done? Before or after the tuning session and the installation of the SAFC/750s.

 

[1FASTRICE]

The afc has been on the car for about 2 yrs.. Just put this 1g motor in last summer. Installed the 750's and 50 trim about 2 months ago and the tests were done at operating temperature 15 minutes before the street tune

I mean dont get me wrong here...The car does run strong. The car was tuned with the wideband O2 and is within its saftey percentages for being rich/lean

The car actually runs better now than it ever has.

 

[oldman]

The afc has been on the car for about 2 yrs.. Just put this 1g motor in last summer. Installed the 750's and 50 trim about 2 months ago and the tests were done at operating temperature 15 minutes before the street tune

Now that you're having overheating issues after the street tune, do another one.

I mean dont get me wrong here...The car does run strong. The car was tuned with the wideband O2 and is within its saftey percentages for being rich/lean

So the tuner never bother to monitor timing during or after the tune?

 

[tsiawd1995]

Oldman is right your pulling to much fuel out and that is making your timing go to high and knock up top and now you have a blown headgasket it happens alot with a afc and big injectors. Go smaller or dsmlink or chipped ecu.

 

[1FASTRICE]

Oldman is right your pulling to much fuel out and that is making your timing go to high and knock up top and now you have a blown headgasket it happens alot with a afc and big injectors. Go smaller or dsmlink or chipped ecu.

Blown head gasket and car still drives fine?

Theres no way I could pull on a stage 2 SRT-4 with a blown HG

 

[tsiawd1995]

Blown head gasket and car still drives fine?

A car can run fine with a blown headgasket I drove my car for 6 months with one it only blew coolant at 25psi and above I just filled back up after the track. (I was lazy that year) I would fix it asap.

 

[1FASTRICE]

A car can run fine with a blown headgasket I drove my car for 6 months with one it only blew coolant at 25psi and above I just filled back up after the track. (I was lazy that year) I would fix it asap.

Even with no signs of white smoke out of the exhaust or any obvious signs like that?

 

[tsiawd1995]

Even with no signs of white smoke out of the exhaust or any obvious signs like that?

You most likely have a small rip in a coolant passage and under boost when the head lifts a little you are loosing pressure and that is the reason for the filling of your overflow bottle.