Dynoing in 2nd or third gear will actually lead to lower numbers. I have ssen it many times. Besides our 4th is an overdrive gear 0.89. third is close to 1:1 at 1.18:1. My cluch cannot handle 4th gear on the dyno unless I start it at close to 4K it slips.

 

So your dyno'ing in 3rd where the ratio is higher then 1:1...

3rd=higher HP to wheels based on higher then 1:1 ratio

4th=lower HP then 3rd due to frictional losses because it is lower then 1:1 (.89) but it is the closest ratio to 1:1 thus, the car should be dyno'd @ 4th for accurate results.

Thats the way I've always understood it

 

Have you ever seen the dyno data for a TC Cobalt in 2nd Gear it makes less HP than 3rd or 4th.



Peak numbers in third and fourth are about the same. (Stock IC car heatsoaks kinda fast). 90% of number on here are 3rd gear pulls. Neither 3rd nor 4th are exactly 1:1 so there is no entirely accurate dyno results with this strange transmission we have. technically Hp number in 4th should be higher because it is an OD gear. Using a lower than 1:1 gear like third or 2nd actually results in less hp.

 

What I saw while dynoing....

3rd gear netted a little bit more HP but 4th gear netted more torque.

I did mine in 3rd os I wasn't wrappin' the car so high on a dyno!

 

It should be pretty close. Mine was within 2 hp from third to 4th.

It is about 2-3 hp higher and the problem is those are not full pulls. When shifting the rpms drop but not the same amount because of the uneven gaps in the gear ratios. Yes, when my car was stock we used 4th gear some and 3rd gear the difference was so little that it really makes no difference. Here is the thing 3rd is 1.18 4th is 0.89. Both are about the same ratio difference from 1:1 exactly so one is going to read a tad higher than actual and one is going to read a little lower than actual. I watched a SRT4 caliber get dynoed and they did 4th gear which on that car and most others is 1:1. It made 307 whp, in third it made 294 whp, in 2nd it made 272 whp. The dyno will read lower in gears numerically lower than 1:1!!! Dont believe me? Dyno your car in 2nd or third if you want. 2nd will be a ton lower and third will be nearly the same because the ratios are very close together. Believe what you want.

 

Of course it will dyno different in 1st or 2nd for that matter....Mainly this applies to turbo cars....Your engine is outrunning the turbo, its that simple. A mustang dyno can load over a constnat time which would give you accurate information if you used a mustang dyno (not just any inertia type dyno)

 

I used a dynocom which is a load type dyno. It applies a dynamic load based on car weight and throttle position and speed just like a mustang dyno . The only difference is that it corrects for the load put on the car so it reads about the same as a dynojet ( within 2%) Another member on here Tofu had his dynoed on the same type of dyno as me and his car actually made 10 whp more than mine SAE corrected. All cars and dynos read a little different.

 

I made 307 361 tq on a dynocom with the trifecta tune and a dejon intake.

 

This thread is full of win.

css at it's finest...

 

You would know with your 200 total posts right.

Man, that torque seems really high compared to others with that same tune. HP is about right. How much load were they running? STD or SAE?

 

OMG! Thanks for calling me out on that. I'm so happy that the upper echelon members here feel the need to point out my sub 4000 post count, thinking that it means anything about my ability to look around and see all of the ass hats in this place.

You're only adding to the amount of mentally incompetent people on here.

 

I know more than you seem to. Why dont you post something of value instead of bashing if you think you are so intelligent? You like being bashed? Guess not. No one does. I proved my point. I am out.

 

Says the man who started bashing me...

I make a joke and get bashed...



I shall restate my first point, css at it's finest.

 

And the reason for the high school style bickering match is....?

 

What else would there be to do it would get boring.....lol

 

Dude if you are joking you need to make it more clear. Emotions cannot be read online.
I am sorry I acted like an ass. I was in a bad mood. No hard feelings.

 

Lol. Well when you put it that way... who can resist?

 

Thats right

 

None at all man!

 

What is your name? I am David nice to meet you.

 

Mine is Haywood Jablome. Nice to meet you.

 

. Nice name funny guy.

 

I'm Chip. Nice to meet you as well, fellow e-jerk.

 

. Actually, I am a jerk once in a while, but if you ask around the LNF section I am very helpful to everybody who needs a question answered or has a problem.

 

cough cough all the time cough