4th gear dyno pull...lower numbers?
4th gear dyno pull...lower numbers? Hello,
Just wondering if anyone knows if doing a dyno pull from 4th gear would put up lower numbers?
I was told 3rd gear was the proper gear for the dyno, but mine was always done in 4th. I am not sure what to believe as only the gear ratio changes per gear, not engine power...right?
Your thoughts?
Thanks for your time!
Just wondering if anyone knows if doing a dyno pull from 4th gear would put up lower numbers?
I was told 3rd gear was the proper gear for the dyno, but mine was always done in 4th. I am not sure what to believe as only the gear ratio changes per gear, not engine power...right?
Your thoughts?
Thanks for your time!
generally you want to get the tranny in the close 1:1 gear ratio you can to get a dyno reading and in a t56 4th it 1:1 so I;d say it was done in the correct gear. what are your mods and what did the car make
I've seen cars gain nearly 10rwhp dynoing in 4th over 3rd.
The reason some people use 3rd is that it turns up much quicker, so you're not holding the motor WOT for as long of a time. The important thing to remember is that you use the same gear every time you dyno your car.
The reason some people use 3rd is that it turns up much quicker, so you're not holding the motor WOT for as long of a time. The important thing to remember is that you use the same gear every time you dyno your car.
Trending Topics
Thank you, it's always bothered me that my car was done in 3rd (on a dyno dynamics) but I was told it wouldn't matter. Some people claim my numbers were inflated due to the gear.
Made 324rwhp/341rwtrq with just FRA.
Made 324rwhp/341rwtrq with just FRA.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
regardless of numbers the car should be dyno'd in 4th gear for means of accuracy ........in very fine tuned applications AFR should be also checked in a track/street application, acceleration rates of the engine differ from different gears and loads which can cause effective AFR's to vary slightly....just remember "dyno numbers" mean virtually nothing, a dyno is a TUNING tool. Comparing numbers from one dyno to the next has become more of an internet fad than a means for useful data.....too many variances in not only operators and steups but also maintainence and calibration of weather metering equipment that applies correction factors exsist from one dyno to the next to do this......you never see stories of proud men and their dyno's 
Even the correction factors do not make up for the heat. Best to do it when it's in the 70s or cooler. But either way, you should get them corrected to SAE. I can't believe a dyno operator would not be familiar enough with these cars to not know which gear to use. Also, a car that has cooled off versus a hot car can make a significant difference as well.
Last edited by Bill00Formula; Jan 6, 2012 at 11:51 AM.
STD is a correction factor just like SAE. It's generally the correction factor shops use to inflate numbers since it corrects to a higher # than SAE.
