I have a 98 LS with the DRAG III kit, MSD-BTM, AEM Fuel Rail, S-AFC the car is an automatic and I could only get a best of 15.8 in the quarter mile with a reaction time of .602 what is going on? Here's something else at the 1/8 mile I was at 88MPH and the 1/4 mile I was at 88MPH does this mean anything? At the Dyno I only put up 150hp! I checked the transmission sensors and sent the turbo to turbonetics to get tested and rebuilt, after another 700.00 I am still no faster!!! What is going on with my **** man?!?!? HELP

P.S. My A/F Ratio on the Dyno was 11.5:1

 

its called auto tranny. dump it and get 5spd. the tranny just doesnt shift right with a boosted application.

 

well said

 

maybe you are shifting into 4th gear. what gear did you finish in? i dont have an auto but i think someone else had the same problem.

 

I launch in first and finish in 3rd (that's D3 since it is an auto)

 

umm, they are right about the tranny, but have you done any tuning on this motor? Too many peeps slap on the turbo kit and expect to run 12's.. tuning is the key

 

if you want to make that auto go fast get higher stall converter. something that will shift faster as well out of the hole. I would call level ten and see what they have for you. If you can get somethign rigged up it will work better. I think better valve bodies should help as well.

 

It is tuned pretty good, I mean the dyno sheet's fuel curve looked great! atleast that is what the guy at the dyno said. The shop that installed it helped me set-up the AFC are there any sites or any documentation on tuning with the AFC more specific to my model and parts list? I have heard some negative things about level10 I would rather get a GSR 5 speed - any body know a good place to get one inexpensively?

 

i thought getting those torque convertor things for automatics suck for daily driving? autos are worth more to normal people... sell it buy a manual, drop in the turbo and have extra money left over. just an idea... (that i went with)

 

depends they make converters that "lock up" for regular driving and don't stall while cruising..

FYI a properly set up auto for example a powerglide with a 4500 stall converter will be a hell of a lot of more consistent than a 5 speed anyday.

 

wheres the fun in that?

 

u only made 150whp? i made about that with just bolts ons man.. something has go to be wrong.. i made 210whp at 7lbs on a 2in exhaust.... i dont know where to start.. could auto tranny really make it that worse?

 

interesting ...

 

if your only getting 150 whp,id take alook at your tuning,a serious look,where is your timing set,what is the btm set at?my b16a3 did 156 with just bolt ons.

 

man i noticed one thing, an a/f of 11.5 is too rich. it needs to be 12.5 across the power band.

 

where is your timing set at? how much boost were u running? are u loosing boost between shifts? if u have an auto u need to brake boost off the line otherwise u will hit like a 2.7 60' but then if u brake boost u may break sumthin.. just get a stick, it will be well worth the investment.

 

I kept it a little rich due to the fact that I am worried about detonation - Where should I set the AFC settings to bring the a/f to 12.5:1? Currently the BTM is set on 0 degrees of retard...I didn't want to mess with the timing until I got the fuel tuned properly but maybe I am doing it wrong! I spent a **** ton on a this car and because of something fucked up I can get walked on by GSR with i/h/e!!! That's BullShit!!! What should I do?

 

how much boost?.. 11.5:1 A/F is fine.. u will still make good power with that.

 

no 11.5 is still too rich. i only have settings for my car. i produce 196 @ 10psi with an a/f at 12.5. i'm running a d16y8. the dyno shop should've advanced your timing already along with tuning the vafc. fuel may not only be your problem but it'll rob you of power in an instant. good luck man

 

Even with the parasitic charateristics of the auto tranny, you should still be pushing about 180whp at 7psi. It sounds like you've poured a lot of money blindly into rebuilding your turbo and trusting every word your tuner has told you. My suggestion is to get a second opinion from another tuner. As you may have noticed, it's very hard to diagnose such a problem without looking at the car.

 

11.5:1 is not too rich, its definitly not perfect for maximum hp but turbo cars love fuel 11.5:1 is a nice safe good power making A/F ratio.. 12:1 is what I consider perfect in a street boosted car, 12.5:1 is right on the edge of peak hp/too lean, i wouldnt want to push the limits too much on my street car.. but the point of my post was that his A/F of 11.5:1 is not his problem. It has to be something else..

my car on 11:1-10:1 A/F and 7psi made 215whp.. stock timing, no tuning, Revhard kit, basically the same set up as this guy except i have a 3" exhaust which i dont think makes a whole lot of difference at 200hp. here is the dyno



so even with an additional drivetrain loss from the auto he should still be around 180-190whp.


[Modified by DIRep972, 3:13 AM 6/8/2002]

 

the ideal a/f ratio is 12.5. i agree for a street car 12.1 is good but 11.5 is still not good enough. no offense but your a/f is terrible before 4,500rpms looking for detenation and your fuel ratio is bad all the way across the chart too. do you have fuel tuning capabilities?

 

Alright Alright...

I ran the best time I have in my sig, but the difference between you and me is:

1. I'm not tuned yet, and I run stock injectors
2. I kept my car in D4 BOTH times and it SHIFTED into 4th a good while before I was finished with the 1/4
3. My traps were 89mph and 90mph in that order both like I said in 4th.
4. I KNOW my car will net better times next time I go and pull in 3rd all the way instead of 4th.. why? higher rpm with more hp/torque and 3rd gear pulls over 110mph before bouncing 7000rpm (according to 2 test runs I did while watching the AFC)

I dunno whats wrong with your car, I have yet to goto a dyno and get tuned and get a dyno printout of my hp etc...

Let me ask you something though
What EXACT turbo do you have? Does you car pull like a bat out of hell like mine does when it hits full boost from a stop 1st gear - 2nd gear - 3rd gear? I dunno my my car feels like it pulls hella more then 150 at the wheels at full boost man... I'd be suprised to see that.

Wish me luck next time I go, mabye I'll do us autos some justice... I mean if JRSC autos are pulling 14's why in gods name wouldn't a turbo pull the same or better?

Also what were your 60' times on your runs? mine suck at 2.743 as my best one.. thats horrid even for an auto!

 

I agree the A/F looks shitty, but im not getting any detonation.. I have nothing to tune with, im putting togehter my parts for hondata as we speak.. but look at my car, 230whp with shitty fuel, obviously something is not right on his car.

 

230 whp is power but i know you could make more with some good fuel settings.