NW-FBody

ive not been driving this car aggressively until recently. i did lid/headers/catback and a frost tune. Ive read that the trans will not shift into 4th at WOT and will pull 3rd to redline, but mine stops short around 5k in 3rd and then shifts to 4th and kinda bogs right around 90-100. ive not driven a ls1/f-body before so i dont know how it should feel, but this is disappointing. the car feels powerful, and will spin the tires right off, but the 3rd-4th shift at WOT makes it feel slow.

What would cause this? it did it before the tune so i dont think it was that. it has 2.73 gears FWIW...

what is generally the cause of this? tq converter slipping? tuning issue? the car does have 130k on it.

thanks in adance

SSickLS1SS

best thing to do in this case would to probably take a video or have someone take a video while you drive, its hard to diagnose a problem without actually seeing it happen

bbond105

Contact your tuner ask them if this is something they can tune out.

NW-FBody

well, it was just a cheap mailorder tune from Frost. the engine feels fine, overall more power and much smoother everywhere. i did the frost tune with longtubes, a lid, slp LM1, and a k&n.

its just the 3-4th shift at WOT that bugs me. it ruins a 0-100 pull for me. the odd thing is, it does it in either gear selection (3) or (D).

i really dont want to send it back so i may just wait until i do a stall, gears, and cam this winter

ramairetransam

iTrader: (18)

email frost and ask him

Carguy8888

iTrader: (1)

Following along for info.

redtan

iTrader: (5)

Probably in the tune. Reading a stock '00 A4 file it shows that anything over 50% throttle in 3rd will hold that gear till redline. So if it's shifting into 4th at heavy throttle then someone changed that aspect of the tune.

mrvedit

EDIT: I missed this is a 2.73 rear. See next few posts.

The trans is completely controlled by the PCM and the shift tables (which can be tuned) determine when the shifts occur depending upon speed and throttle position. (At WOT a tuned RPM also needs to be reached).

While unlikely, it is possible that the trans temp sensor is sending a false "hot" value which would cause the PCM to use a much more conservative shift table.

(I've never tried a WOT 3-4 shift because with my 3.42 rear and 6500+ rpm shifts, that would be in the 140 mph range).

01ssreda4

iTrader: (96)

Sorry buddy but 90mph with 273s is probably 2/3 shift, as indicated by it happening whether you're in D or OD. You're bog is because those gears are dogs, you need more HP or a better pulling gear.

mrvedit

Good eye. I missed that you have 2.73.
Upgrade to a 3.42 or 3.73 and you will have much better performance.

NW-FBody

There's something going on then because I can count the shifts. Definitely shifting three times. I'll post a video.

NW-FBody

Also, if it was the gears, wouldn't it be sluggish down low and pull good up top? Because it is the opposite currently.

redtan

iTrader: (5)

No, gears don't change how and where it pulls better. With 2.73s it will be sluggish down low and sluggish up top. Higher numerically gearing will increase pull everywhere (until you run out of RPM).

Chris25

iTrader: (1)

I know with mine theirs this dead spot with the stock stall right around 40mph, from what I have read an after-market stall really makes a difference. Definitley what Im looking at doing next.

01ssreda4

iTrader: (96)

Video would be great.

NW-FBody

got a video, and you were right. it WAS 2-3 around 90mph. i was convinced otherwise, so i feel dumb. i think gears are the solution, but how does this pull look? i have no idea what it should feel like, and my first track night will be this coming saturday.

also, any tips on the a4 launch? i will be running street tires fortunately for my 10 bolt.

NW-FBody

http://vid1095.photobucket.com/album...ps703023c9.mp4

Chris25

iTrader: (1)

That looks like a pretty solid pull for an A4 with 2.73s and a stock stall.

Chris25

iTrader: (1)

Im assuming your still running the stock 16s right ? I would try to leave just a little over idle not to much more so you dont blow the tires off and bring the tire PSI down to 30 pounds or so.

01ssreda4

iTrader: (96)

Yep, this car could seem so much more lively with some 3.73s.

This may kind of give you an idea of how the car would react with some gears and a stall.

https://ls1tech.com/forums/multimedi...uge-shots.html