Dyno runs/tuning
07-06-2011, 11:31 PM
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Dyno runs/tuning
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.
07-07-2011, 02:15 AM
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07-07-2011, 12:30 PM
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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
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
07-07-2011, 01:18 PM
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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..
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..
07-07-2011, 02:13 PM
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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
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
07-08-2011, 09:51 AM
#14
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?
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?
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