TheNutDriver

iTrader: (1)

Im not sure if this is a trans issue or a tune issue - if I'm driving VERY carefully, such as in traffic or in heavily built up areas, my 1-2 shift seems odd. If i lightly press the throttle in 1st gear from a stop and don't try to accelerate very much at all, the trans will shift into second at about 8mph - but it seems to drop the RPM too much - almost back to idle speed of about 900 rpm. At anything more than a light throttle application the shift is perfect - Well it feels more "normal"

is that an issue?

TheNutDriver

iTrader: (1)

Its almost as if it shouldn't shift so soon if you know what i mean...i always feel like it should stay in 1st for longer..thats what I'm trying to get at with "is this an issue"

clinebarger

Tuning.....What Converter & Gear Ratio are you running?

TheNutDriver

iTrader: (1)

Hi,

im not sure of the manufacturer but I was told it's a 2800 stall converter. The rear gears are the standard 10 bolt for the A4.

mrvedit

Just FYI:
I just looked up the stock tune for a 2002 Camaro SS (which is likely the same as your car) and the lowest speed the 1->2 shift occurs is 11 mph at very light throttle.
At WOT it is at 37 mph.

TheNutDriver

iTrader: (1)

Thanks. So another thing to add to the list for when i get HP tuners!

Ruffturbo911

My car shifted weird when my TPS threw a code replaced TPS, cleared code. Shifts fine now.

TheNutDriver

iTrader: (1)

Tps is ok, it's been on the oscilloscope to check it. Fourth one on the car in 12 months....seems delco quality isn't what it once was.

mrvedit

Having to keep replacing the TPS makes me wonder if something else is going on. I can see that the original TPS wears out after 15 years due to the moving parts, but not in 3 months.

TheNutDriver

iTrader: (1)

The original TPS had a dead spot. The first replacement - the potentiometer reading was totally different to a stock TPS and causing odd shifting, the second replacement was an AC Delco professional unit but after a couple of drives and noticing strange shifting behaviour again I took it off and it fell to pieces in my hand (central part the throttle shaft fits into fell out) and finally the 3rd replacement and fourth TPS in total over the last 12 months - a standard motor products one, works fine and has been fine for 8 months approx.

clinebarger

That's a pretty tight converter, Especially if those dyno numbers in your sig are for a 5.7L, The standard gear ratio for a A4 car is 2.73.

While trans/shift point tuning will definitely help......The underlying issue may be your camshaft & converter not playing nice with each other.

clinebarger

AC-Delco has 3 different product lines...
GM OE.......Manufactured to GM OE specification for fit, form, and function
Professional......Manufactured to meet expectations for fit, form, and function
Advantage.......Manufactured by the lowest bidder.

GM OE TPS Sensor, Part# 213-912 or 17123852

AC-Delco Professional, Part# 213-4668