Fat on the air fuel, boggling me!!!!

[Brasco]

I thought the air fuel being fat was causing me to have a slow boost condition but it seems as its real fat on the big end 10.0s of the scale fat. Cant figure it out because before i switched tp a front mount intercooler and 6776 turbo from the T64e it ran mint 11.3-11.6 all the war across the board. I checked all i can think of. I dropped the tank again to see if i had a line pinced all the lines look to be the correct way. the regulator is working fine it jumps from 45(vac on) to just about 60 (vac on) at around 20 pounds of boost. If im trieing to just get things sorted out on pump gas and its a tt race chip how much would it affect the running condition as far as breaking up ? I dont see any vacuum leaks. A little lost

Thanks Donny

 

[TurboV]

post some numbers on Scan-tool, at WOT to if you can. Is the car breaking up and sputtering when you get on it? Does it smoke at all if it does?

 

[Brasco]

Im using a dynojet wideband to tune the car.It goes real fat as soon as it gets loaded on the turbo and starts to stutter and fall on its face and then i shut it down... feels like its lean thats how it acts but its real rich. of the scale rich 10.0s rich i dont see any smoke tho but its a buckn ride.

 

[GNVYUS 1]

If you had a pinched fuel line it would choke off flow, not increase it. The chocking off would cause the car to lean out, not go fat.

45psi with the line off is about 3psi more than most chips are calibrated for and yet you're saying you're at 45psi with the vac line ON, bingo.

Also looks like your fuel pump is not pumping 1:1 boost/fuel pressure which actually has the opposite effect on your AF/R so I don't know what to tell you there.

IF you're tuning it on a dyno than it going fatter than the street tune is normal.

 

[Brasco]

If the return line was pinched it would cauce the fuel pressure to increase causing a rich condition. And my mistake 45 with vac off. The dynojet wideband is wired into the car so im not on the dyno im driving it on the street. Dont no im going to try lowering the fp to 42 and lower the boost down more and maybe add some c16 to see if it needs the race gas to run without breaking up since its a tt race chip.

 

[TurboBuRick]

Does AFR's stay in the 10's when it bucking or does it osculate lean/rich?

 

[Brasco]

when i leave from a dead stop and roll into it, the af levels drop down to the 10s or around there but its not a stable readable decline cuz its bucking and braking up so bad.(and i no its a fat conditon also cuz i took a bunch of fuel out of the regulator to see if it helped and it made it less noticable but still not right. And thats only when i roll into it and let the turbo load up if i do it slow and smooth enuff nothing. when im in drive and i do the same thing drops to 10.0s on the air fuel and just runs like a pig. u can feel it running real lazy cuz its so fat.( I also thought it might be blowing the spark out so i pulled all the plugs and regapped them all to see if they were gd. .032 and they looked gd.

 

[bison]

We need more info to accurately determine if you are going in the right direction. Adding C16 will richen the mix vs. 93. I recently tuned a board members car that was set up by a board sponsor after i added a second alky nozzle and the a/f was in the mid to low 9's. He was advised it might be lean with the single nozzle. No way. It was so rich i was able to turn the boost up from 19 to 25 and i pulled a little over 10% of the fuel out of the program. Still was rich at 10.3-10.4 but wanted it to be a safe tune on 93. Picked up about 150 hp in making just those changes. The car will trap 130mph with no problem the way it is set up now. Why dont you pull fuel out of the program and see if it picks up?

 

[Brasco]

I agree c16 will make it run richer,it burns a ton slower. what i was saying is that the tt chip i have is a race chip set up for race gas. Have pump gas in it just to see how it ran on low boost. Maybe the timing on the chip is just to much for pump and how much boost its set for now. Thats why i am going to lower it down a bit and put the safe fuel in and try to get some kind of baseline. Maybe even switch chips just to take something out of the equation. Im kinda chasing my tail and rubbing my head cuz otherwise it runs good. Jus no way near a tire frier lol .
The problem is i should just by the dam alkykit already and stop buying the c16 lol Ill have to get a scanmaster to pull fuel out of the chip.

 

[GNVYUS 1]

If you think the return is pinched all you have to do is try to lower the pressure pretty low, like 25psi line off, if it can do that you're fine.

TT chips are setup for 42lbs line off, email Eric to confirm.

Low stumble could be from the timing being too low with the alky, the car will respond better with timing and alky.

Also, Julio had something for alky and certain Maf sensors to clear low end break up. I know I had break up until I got his bolt on alt kit to clear it up but that might be for only Z06 Mafs.

 

[101prf]

Do you have anything to check for knock? Wouldn't the timing be way to high for pump gas with a race gas chip? My alky chip is 23-21 degrees, race gas can run higher timing. You can remove timing from the chip but you would have to ask Eric what that would do to the curve. I would stick to race gas with that chip or change the chip.

 

[Brasco]

Put race gas in it and its doing the same ****. Talked to John at ESP(Another great guy in the Buick world) and he said to check the coil pack. I just bought this on last year and dont run the car much, there wasnt any thing wrong with the old one just figured when i did a tune up to replace it. ill try the old one and see what happens. If thats not it im clueless for now and the weather over here aint helpn me.