Hey guys. Im going to the dyno tomorrow and i was wondering what gear you guys have used. The first time he had it in 4th and I was wondering if another gear would be more accurate/better.

 

i have always done my pulls in 3rd.

 

well since he did it in 4th already should i just keep it consistant or ask him to do it in 3rd

 

do 1 of each n see which is higher =p

 

3rd = underdriven, 4th = slightly overdriven

generally with 4th being slightly overdriven it should give you some slightly better power numbers in a turbod application.... assuming your clutch can handle the extra drivetrain load in the lower-mid rpm range that is.

I personally have to do 3rd gear pulls otherwise my stock clutch slips something fierce

 

It will be minimal difference between the 2 unless you trigger the COT protection in 4th.

 

What is COT protection??

 

Everyone loves a good 4th gear torque spike to brag about peak numbers though Nick!

 

it makes no diff lol

 

Cat Over-temp protection

No? Seems to me that loading the turbo in an overdriven gear would give you a larger torque spike as compared to an underdriven gear. It sure does it well in diesel applications at least. Granted we're talking a much larger and laggier turbo, however it is still a turbo setup non the less.

Ehh oh well..

 

we made 447wtq in 3rd gear, seems to work just fine lol

 

Come on Nick. Defend your point better than just brushing what I have to say off as bupkis and throwing random numbers at me man. I like to think you know better than to assume I'm just going to make **** up and throw it out there like that.

Granted I may not know as much as you about every performance application, but everything I've ever known about dynoing a turbo vehicle has always dictated that loading up the turbo in a taller gear will yield higher power numbers.. especially torque. Whether it is only 5-10whp or not. Hense my earlier statement: "generally with 4th being slightly overdriven it should give you some slightly better power numbers in a turbod application"

I'm not trying to be an argumentative jerk here by any means btw. You're just coming off as a tad condescending

 

I defended it.. You can make tq just fine in 3rd and we saw no difference in 4th. What else do I need to say here? lol

 

Just throwing out my .02 cents...

I've done about a couple dozen or so dyno pulls on my car and there is almost no difference between 3rd and 4th gear pulls besides the fact that 4th takes longer lol. When I was stock and putting down the base numbers (in my sig), they came up within 1-2 hp and 1-2 tq between 3rd and 4th gear. We did 1 pull in 4th and the guy doing the dyno said it took too long to do the pull... I have no idea what he was going on about, but I digress. He then did the next 2 pulls in 3rd and the numbers were pretty much exactly the same. Tuned, they came up almost the same, within 1-2 hp and tq from a 3rd gear to a 4th gear pull. These cars are very consistant.


Was that long enough of an explenation?