i was told 3rd because it is closer to 1.1 than 4 th was.

 

f35
1st 3.38
2nd 1.76
3rd 1.18 + .18 4th is closer
4th 0.89 - .11
5th 0.70

 

3rd 1.18 +.8 cause you wanting to be at 1.1 3rd is closer.
4th 0.89 -.12 thats way so low

 

No.. its not 1.1... its 1:1... a 1 to 1 ratio...

 

oh ok my bad.

 

yes, what shortstack said

 

you opened a thread w/ a poll about this. i'm interested to see what the majority is.

 

i dyno in 3rd

 

they were doing 4th gear pulls at the dyno I saw

 

Its all preference... you can dyno in what ever gear you want...

3rd will produce "higher" numbers.. 4th will give you a more accurate reading.

 

If they calibrate the dyno to compensate for the gear ratio then it shouldn't make much difference.

 

I dyno'd in fourth. The Quaife kit makes fourth 1:1.045


I didn't vote as I don't think that there are many Quaife's out there ...

 

I've always dynoed in 3rd gear, but I have heard of plenty of guys dynoing in 4th.. Its all preference and you'll see similiar numbers.

 

I've dyno'd both gears. The difference is only 2-3whp when doing so. That is not enough to justify running the car all the way through 4th putting more strain on the motor and drivetrain IMO. 3rd gear will do you just fine and be accurate, plus that is what gear you should do your tuning/logging in anyhow.

 

There's no wind resistance on a dyno. There is hardly any extra strain between 3rd and 4th on the dyno if any at all.

 

Hardly any strain? Hello, pulling from 20-30mph all the way to 135-140mph in a longer gear is alot harder on the drivetrain and motor than a quick 3rd gear pull to 110ish. The heat created is reduced, the soak time between pulls is reduced, and when you are on the dyno tuning for 4+ hours this is very important! I tune for every ounce of power and torque while maintaining reliability and have had many different setups, so I have plenty of experience with dynos and tuning. I also have a fully built Integra turbo that has many hours of dyno time logged, plus I've run the dyno for the shop's tuner so he could work his magic on other cars. Trust me when I say the strain on dyno is a lot worse in 4th gear. Mustang Dynos are load bearing dynos as well, and that is all I will tune on.

 

i always dyno in 3rd .. never done this car b4 though... only acception was my 240 i got better numbers in 4th( well more accurate)

 

Last time, there is no difference!!! I operate dynos!!! A mustang and a Dyno Jet and there is no difference, usually the difference is the acceptable amount between runs/ heat soak/ etc. Third gear is safer as wheel speeds are not as high. I have dynoed both in third and fourth dozens of cars and there is no difference. As for strain, yes there is more strain on the car in fourth gear as the engine is subjected to high rpm over a longer time period, rpm kills.
The only time I would suggest fourth gear is if the car is breaking loose on the dyno and your not getting a clear reading. The extended time in fourth gear can help the car maintain traction on the roller.

 

Thank you sir for chiming in with that information! Someone else that understands what I am talking about. The difference between 3rd and 4th is so minimal on these cars it's not worth the extra strain, unless you have traction issues as stated!