Stock Motor Dyno Question
#1
Stock Motor Dyno Question
Hey everyone, got a question I have a fantom dyno and I was using the oval gearing calculator and the pinions and spurs...It told me that I should run a 72/34 and I am running a Tc4...The biggest problem I am having is that the 34 pinion will not fit in my car...Do you guys have any suggestions and input on how acurate the gearing program is on the dyno? Or what I should do to check whether or not the gear ratio is correct? thanks in advance Jeff
#2
Super Moderator
iTrader: (239)
Originally Posted by jeffbhhs
Hey everyone, got a question I have a fantom dyno and I was using the oval gearing calculator and the pinions and spurs...It told me that I should run a 72/34 and I am running a Tc4...The biggest problem I am having is that the 34 pinion will not fit in my car...Do you guys have any suggestions and input on how acurate the gearing program is on the dyno? Or what I should do to check whether or not the gear ratio is correct? thanks in advance Jeff
#3
Tech Master
iTrader: (64)
I could be wrong but if you find the roll out your looking for with the gear the computer tells you then change your spur gear and pinion gear sizes but keeping the same roll out you should be fine. Basically if thats the roll out your wanting to run you will have to find the gear that fits the car. This happens alot with oval cars as well. Its just a simple change.
#4
Tech Apprentice
TC4 large pinion
Get you Dremel out.
You need to remove a little from the webbing under the pinion. Also, fit the aluminium cam to the motor and turn it as far as it will go for a big pinion. Note where it touches (and is stopping you turning any further) and file material away to make it turn further. You will need to do this in two places on the cam. I did this and managed to get a 37/72 combination with no problems.
regards
Don
You need to remove a little from the webbing under the pinion. Also, fit the aluminium cam to the motor and turn it as far as it will go for a big pinion. Note where it touches (and is stopping you turning any further) and file material away to make it turn further. You will need to do this in two places on the cam. I did this and managed to get a 37/72 combination with no problems.
regards
Don
#5
Originally Posted by donwhit
Get you Dremel out.
You need to remove a little from the webbing under the pinion. Also, fit the aluminium cam to the motor and turn it as far as it will go for a big pinion. Note where it touches (and is stopping you turning any further) and file material away to make it turn further. You will need to do this in two places on the cam. I did this and managed to get a 37/72 combination with no problems.
regards
Don
You need to remove a little from the webbing under the pinion. Also, fit the aluminium cam to the motor and turn it as far as it will go for a big pinion. Note where it touches (and is stopping you turning any further) and file material away to make it turn further. You will need to do this in two places on the cam. I did this and managed to get a 37/72 combination with no problems.
regards
Don
Also how does the RPM Factor work for the gearing? I was told by someone at the track that I should simply enter in the number that is on the bottom of the screen, says something like 47% at 13000 rpm i think so my rpm factor would be 47%? is that correct?
Last edited by jeffbhhs; 02-02-2007 at 09:33 AM.