Could a low dyno and bad track times be the result of an A4 2-3 shift hesitation?
11-28-2004, 11:23 AM
#1
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Could a low dyno and bad track times be the result of an A4 2-3 shift hesitation?
From a recent post of mine:
I never mentioned that, during the last two runs above, I noticed that there was a slight hesitation at the 2-3 shift. Could that be the result of bad spark plugs or a bad transmission? Could that hesitation be also the reason why my dyno runs have been so low and why my times and mph were so bad? If I do have a bad tranny, then maybe I can get it fixed under an extended powertrain warranty. Thanks in advance for the info.
Originally Posted by damon_Z
My baseline dyno happened a while ago and the 2002 Z28 only had around 13,000 miles on the odometer. Check out the dyno graph below:
At around 46,072 miles and still completely bone-stock, I brought the car to Atco for a baseline quarter mile run. Here were the variables:
- The car had a full tank of gas.
- Each tire had 30-31 psi air pressure.
- Elevation was at -158 ft.
- Temperature was 54 degrees F.
- Relative Humidity was between 76-78%.
- Dew Point was 46.7 degrees F.
- The barometer was 30.09 inHg.
First run was 13.567@103.62; 2.095 60'
2nd 13.512@103.39; 2.107
3rd 13.804@101.84; 2.171
4th 13.687@101.92; 2.126
5th 13.540@101.80; 2.079
6th 13.679@101.84; 2.102
Is my car retarded or something? Why are my dyno numbers so low and why are my quarter mile numbers so horrible? Should I get a dyno tune? At less than 8,000 miles, the dealership replaced my transmission's pressure control solenoid, because I was getting a P0748 code. (The car was intermittently shifting too hard.) The car shifted fine afterwards. Could replacing the solenoid be related to my low power and slow times? Thanks in advance for the info.
At around 46,072 miles and still completely bone-stock, I brought the car to Atco for a baseline quarter mile run. Here were the variables:
- The car had a full tank of gas.
- Each tire had 30-31 psi air pressure.
- Elevation was at -158 ft.
- Temperature was 54 degrees F.
- Relative Humidity was between 76-78%.
- Dew Point was 46.7 degrees F.
- The barometer was 30.09 inHg.
First run was 13.567@103.62; 2.095 60'
2nd 13.512@103.39; 2.107
3rd 13.804@101.84; 2.171
4th 13.687@101.92; 2.126
5th 13.540@101.80; 2.079
6th 13.679@101.84; 2.102
Is my car retarded or something? Why are my dyno numbers so low and why are my quarter mile numbers so horrible? Should I get a dyno tune? At less than 8,000 miles, the dealership replaced my transmission's pressure control solenoid, because I was getting a P0748 code. (The car was intermittently shifting too hard.) The car shifted fine afterwards. Could replacing the solenoid be related to my low power and slow times? Thanks in advance for the info.
11-28-2004, 11:51 AM
#2
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Location: Sac, CA
Posts: 674
Re: Could a low dyno and bad track times be the result of an A4 2-3 shift hesitation?
The dyno run is made in 3rd gear only and the 2-3 hesitation is torque management - on stock car it might be costing you a couple of hundreths.
There's is nothing wrong with your car ... you are in the range of stock LS1 both for your dyno and your times. You are beating yourself up over internet cars ... which much much like Lake Woebegone - "everyone is above average".
My stock numbers were 13.57 and 279 rwhp. You want to go faster ... mod your car.
There's is nothing wrong with your car ... you are in the range of stock LS1 both for your dyno and your times. You are beating yourself up over internet cars ... which much much like Lake Woebegone - "everyone is above average".
My stock numbers were 13.57 and 279 rwhp. You want to go faster ... mod your car.
11-30-2004, 04:46 AM
#3
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Re: Could a low dyno and bad track times be the result of an A4 2-3 shift hesitation?
Originally Posted by V6toZ28
The dyno run is made in 3rd gear only and the 2-3 hesitation is torque management - on stock car it might be costing you a couple of hundreths.
11-30-2004, 01:55 PM
#4
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Location: AZ
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Re: Could a low dyno and bad track times be the result of an A4 2-3 shift hesitation?
As already stated, the hesitiation you are feeling is likely the torque management system. Don't get hung up on dyno numbers. 13.5 @ 103-104 bone stock is about right for an auto. Yes some have gone faster but you could play that game all day. Your car is fine.
12-02-2004, 12:20 AM
#5
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Location: Mason, MI
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Re: Could a low dyno and bad track times be the result of an A4 2-3 shift hesitation?
If... when you start modding your car... and decide to go with heads and cam... don't let the guy doing the tuning take out torque management... maybe reduce it's effects.... but don't delete it... it will break stuff... I know... 
(and that was with just "reducing" it) Torque management is a pain, but trust me... taking the tranny out 5 times in one year (with it being my only vehicle) is a real pita... it's not worth pushing the stock one... I finally got one that will tolerate a little hp. But yeah... those numbers sound pretty normal for a stock A4 car.
(and that was with just "reducing" it) Torque management is a pain, but trust me... taking the tranny out 5 times in one year (with it being my only vehicle) is a real pita... it's not worth pushing the stock one... I finally got one that will tolerate a little hp. But yeah... those numbers sound pretty normal for a stock A4 car.
12-02-2004, 03:21 AM
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Re: Could a low dyno and bad track times be the result of an A4 2-3 shift hesitation?
Originally Posted by 98VortechZ
If... when you start modding your car... and decide to go with heads and cam... don't let the guy doing the tuning take out torque management... maybe reduce it's effects.... but don't delete it... it will break stuff... I know... (and that was with just "reducing" it) Torque management is a pain, but trust me... taking the tranny out 5 times in one year (with it being my only vehicle) is a real pita... it's not worth pushing the stock one... I finally got one that will tolerate a little hp. But yeah... those numbers sound pretty normal for a stock A4 car.
(and that was with just "reducing" it) Torque management is a pain, but trust me... taking the tranny out 5 times in one year (with it being my only vehicle) is a real pita... it's not worth pushing the stock one... I finally got one that will tolerate a little hp. But yeah... those numbers sound pretty normal for a stock A4 car.
I've had torque management mostly removed for 2 years and completly removed for 1 years with no breakage. And I ran the numbers in my sig all this last year.
12-03-2004, 12:24 AM
#7
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Location: Mason, MI
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Re: Could a low dyno and bad track times be the result of an A4 2-3 shift hesitation?
Good call... I'm always one to press my luck for sure! I've just had bad experience with it.. and a few other people I know have too... but if you're runnin' fine... than way cool. Maybe with this new tranny, I'll have 'em take it out.. t.m. sucks!
I've just had bad experience with it.. and a few other people I know have too... but if you're runnin' fine... than way cool. Maybe with this new tranny, I'll have 'em take it out.. t.m. sucks!
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