Dyno pulls in 2nd
Thread Starter
On The Tree
Joined: Aug 2008
Posts: 109
Likes: 2
From: St. Charles, MO
Dyno pulls in 2nd I had my car dyno tuned a while back and we did my pulls in 2nd gear (th350) since my car still has stock 2.73's and would take FOREVER to pull through 3rd.
When I change the rear end gears to 3.73 and do the pull in 3rd should I expect to see any gains from the gear change and pulling in 3rd? I've heard people tell me that the numbers I have now are inflated since the pull was done in 2nd. I have also heard that I will pick up power from pulling in 3rd.
What do you think?
When I change the rear end gears to 3.73 and do the pull in 3rd should I expect to see any gains from the gear change and pulling in 3rd? I've heard people tell me that the numbers I have now are inflated since the pull was done in 2nd. I have also heard that I will pick up power from pulling in 3rd.
What do you think?
It will pick up power in third. I tried this before on a few cars, if your not in the 1:1 gear it loses power. Thats my observations. We tried every dyno trick in the world a few years ago.
Thread Starter
On The Tree
Joined: Aug 2008
Posts: 109
Likes: 2
From: St. Charles, MO
Now just to see how much I pick up and not to do dyno pulls on 99 degree days with a ton of humidity
Any time you dyno try to use 1-1 ratio aka 3rd for our A4 trannies, Also post your before and after dyno sheets i'd be interested in seeing them, i think there could be 5% hp and more than that in TQ
Also its Much better to tune the engine in 3rd because thats where the engine see its highest load over a much longer period, In fact it would be better to just dial in the tune separate for all gears, probably take too much time though
Also its Much better to tune the engine in 3rd because thats where the engine see its highest load over a much longer period, In fact it would be better to just dial in the tune separate for all gears, probably take too much time though
Thread Starter
On The Tree
Joined: Aug 2008
Posts: 109
Likes: 2
From: St. Charles, MO
Any time you dyno try to use 1-1 ratio aka 3rd for our A4 trannies, Also post your before and after dyno sheets i'd be interested in seeing them, i think there could be 5% hp and more than that in TQ
Also its Much better to tune the engine in 3rd because thats where the engine see its highest load over a much longer period, In fact it would be better to just dial in the tune separate for all gears, probably take too much time though
Also its Much better to tune the engine in 3rd because thats where the engine see its highest load over a much longer period, In fact it would be better to just dial in the tune separate for all gears, probably take too much time though
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Interesting point on the 1:1 ratio. Now, with the new 6L80E transmission there is no 1:1 ratio so it probably should be done in 4th gear with the 1.15:1 ratio. I assume there would be a very slight horsepower loss compared to a true 1:1 ratio?
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Any time you dyno try to use 1-1 ratio aka 3rd for our A4 trannies, Also post your before and after dyno sheets i'd be interested in seeing them, i think there could be 5% hp and more than that in TQ
Also its Much better to tune the engine in 3rd because thats where the engine see its highest load over a much longer period, In fact it would be better to just dial in the tune separate for all gears, probably take too much time though
Also its Much better to tune the engine in 3rd because thats where the engine see its highest load over a much longer period, In fact it would be better to just dial in the tune separate for all gears, probably take too much time though
Unless you have a load dyno like myself. A low powered car with 2.73's will overheat the motor trying to do 1-1 dyno pulls. 2nd gear is safer on a setup like that and they have plenty of load. The numbers will be lower in 2nd, but they are only the dyno numbers, not the engine.
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