Howdy,

I have a 97 Z28 A4 with no TCS and i do burnouts and the car still bogs down...i'll have it in "2" and i'll just be sitting there at like 5000rpms and it will just drop. I was always curious what would cause this, i know for a fact im not hitting the rev limiter yet...as i understood it no TCS meant "burnout heaven" and when spring comes around, i want an appropriate way to finish off my pos tires on my stock rims before i add the "wide spoke" vette rims sitting in my room.

Could someone explain this? I plan on adding a linelock from SLP, but still do not see how this alone can stop the bogging down.

Thanks,
Dave

 

im not sure i'm getting what you're saying...

so you're doing a brakestand...and once you're in "second" (D2) at 5000rpm it starts going down slowly?

im thinking the line-loc SHOULD fix the problem but i dont know for sure...im guessing the brakes start to grip or something after warming up? or is it the other way around

PS. WITH TCS...you can still to burnouts you know just click the switch and it turns off ahah

 

You've sorta got it right...i'll be brakestanding it in D2 and sitting there at 5000rpm, and all of the sudden the rpms will drop about a 1000-1300 for no reason that i can think of. I know im not hitting the rev limiter in the car yet i'm just curious as what causes this. My dads 04 2500HD lights up his tires just fine and he has 4 wheel disc brakes as well...i don't understand why my car is doing this really...unless it's just running out of gear?

Dave

 

Umm, i can't exsplain the sudden drop in RPM's. Cause i don't see your brakes grabbing that hard to bog the car down.
Where is Onarga,IL ?

 

another possiblity is that maybe it switches into 3rd gear and doesn't have enough gear to keep them spinning with all that grip so it bogs down?

 

Are you sure you're not letting off the gas at all, even the slightest bit. at such a high rpm in a low gear I'm thinking DFCO would kick in fairly easily. What does this bogging down sound like? Like a jake brake? or like when you're going really fast and you pull your foot off the throttle really quickly?

 

Maybe its your tires getting hot and starting to grip a little better or the road surface is changing underneath them. Just a thought, maybe way off.

 

I'm assuming you have 2.73's since it sounds like D2 is your lowest selectable gear. What's probably happening, is the car is spinning the tires just fine in first gear, and when it shifts into second it doesn't have the power to keep 'em going. It's an easy project to allow for a selectable first gear on an A4 with 2.73's though.

Again, this is just a guess.

 

that would be my guess too, that once your spinning in 2nd and the rpms rise, your transmission shifts into 3rd.
Or did you manually put your shifter into 2nd??

Mike

 

I put the gear selector in D2, it's not like a your cruising and let the rpm's idle down...its like 5000rpm 2 seconds later 3800rpm its freakin crazy. I guess you could say it sounds similiar to a jake brake. I'm positive i don't let my foot off the gas enough to do that...at most ive seen my RPM's fluxuate +/- 100rpms.

Does someone have a link to this "D1/1st gear" mod for my A4? Im a big fan of "powershifting" and only leave it in "OD" when i'm cruising down the interstate or something.

Gilman/Onarga is about 170 miles from macomb.

Dave

 

Or maybe you have second gear start when your shifter is in gear 2 so your car wouldnt have much torque because the transmition is starting out in 1nd gear.

I've only done it a few times but always in Overdrive, doesnt hurt the transmition anymore and it starts out in 1st gear.

 

I too sometimes use only 3rd gear (regular D) on some roads because it holds the car back, but be careful about whatever you call "power shifting" it's an automatic, not a tiptronic, not ment for manual involvement. If you want to shift manual you should of just bought one.

 

I think it has something to do with the 2nd gear start mechanism. Cars that don't have TCS have this feature. When you are at a dead stop and put the tranny into 2, the car starts in 2nd gear. So when you put it into 2 when doing a burnout, maybe that mechanism has something to do with it. Or maybe the ECM cuts power when its in the 2nd gear start mode, but I'm not sure.

 

If you take your shifter console off, there is apparently a little rubber stopper that keeps the shifter from moving back into the "D1" position. This was incorporated into A4 cars with 2.73 gears. A4 cars that came equipped with 3.23's didn't have to have it, because the gear whine isn't as bad as with 2.73's.

When you put your shifter into your lowest selectable gear, (D2), the car will start out in first gear as you're brake-standing your car. As the rpm's rise, the transmission then shifts into second gear and doesn't have enough power to keep the tires going.

To the best of my knowledge, the "second gear start" feature was only available on V6 cars.

Just do a search on "Selectable first gear" or something to that effect, and I'm sure you'll find some sorta better description on how to remove that rubber stopper. That way you'll be able to leave it in first gear and keep it from up-shifting to second.

 

I know that shifting through the gears in an auto isn't exactly a great idea, but im over it. If it breaks, it breaks. My original plan was to buy a 97 Z28 6spd that was black with a black interior but i couldn't find one that was clean (big clean freak) so i bought this...besides i like to change dvd's and drive at the same time since im already driving 90% of the time with my left knee.

Thanks for the advice and tips, if anyone else has any idea's feel free to chime in as i have until late march (im assuming salt will be off the roads by then) to figure this out before the new rims/tires go on.

Dave