105 replies to this topic

[Jamz14]

Do you guys remember that this was regional field? I know it's been a long time for you all since you had this perspective but I did say it. I'm not claiming this would happen in the rarified atmosphere you all live in. The point still stands. It doesn't matter how many seconds it shaves off in you personal run group. It matters that it shaves off time. How much hp does rem coating your gearbox shave off? How much hp does that give back to the rear wheels? Sure a pain in the ass to pull the gearbox to look for that when it is worth less the an ecu swap.

[Todd Green]

 

And that was max torque and HP running basically parallel!

 

That's mathematically impossible.  If HP is constant torque will change (over a range of RPMs).  Since NASA only cares about HP, that is what is optimized and torque will drop off as RPMs rise.  (Note that they are trying to fix this by using multiple sampling points as the classes move to ST and PT gets phased out.  Still wish they'd do (hp+tq)/2 and a wider RPM band.)

[Steve Scheifler]

Given that HP is not measured, but rather a calculated value derived from torque and RPM, it would be more than shocking to see them running parallel.

[Ron Alan]

That's mathematically impossible.  If HP is constant torque will change (over a range of RPMs).  Since NASA only cares about HP, that is what is optimized and torque will drop off as RPMs rise.  (Note that they are trying to fix this by using multiple sampling points as the classes move to ST and PT gets phased out.  Still wish they'd do (hp+tq)/2 and a wider RPM band.)

Yep...had to think about this and what I remembered seeing. I have a VVT chevy motor that I can tune the stock ecu...and the difference I see(compared to a Miata curve) is what might have been more similar. Basically the torque flat lines(max)until it crosses the HP curve(5250rpm)and falls off. The HP curve rises and at the point it crosses Torque it is within 5hp of Max HP until it reaches redline(7000).

 

I guess my point was(and what I thought i was seeing)is the tune is able to keep torque and HP optimized in the curve for a longer period of time.

[Steve Scheifler]

The question often becomes "is my HP curve fairly flat because I make power early and hold it, or because something is limiting it where the peak should be?" Torque vs HP curves tell a lot but variable intakes and VVT have made that less clear without a good benchmark for comparison. With the restrictor plates on these cars if it isn't falling off quite a bit above 6500 then I'd question either why the peak isn''t a little higher or where it is finding the air to flow at 7k.

[Bench Racer]

WOW, guys are learning, you don't need me to start a $hit storm.

 

Hey, I buy into James ECU tail!!!  Same car with nothing car wise changed other than ECU. Oh, different driver. I viewed my car start DFL in a regional field and it cleaned the field other than two IIRC ITS cars. Same ECU, different driver. That ol 1.6 cleaned up on some 94' and 99's.