davwas

Hi all

I run a FireStorm in a Power-to Weight restricted class, here in the UK.

I am bang on the P-to-W (carrying 4lb of lead), but could benifit from more torque!

I have seen various posts re 2 into 1 exhausts, most saying it will up the torque, some saying it will be worse... Any thoughts ???

What about cams?

Any advice will be appreciated

Dave

superhen

You do know that torque and horsepower and directly related, so if you go messing around to find 5 more ft-lb of torque, you will inevitably change your horsepower. For sure you're going to need some dyno time for this. And someone with quite a bit of tuning/building experience, not some fly by night shop who wants you to but a new exhaust and charge you for a dyno run. Probably your best bet would be to change gearing if you haven't already.

comedo

Try Roger Ditchburn at Revolution Racing

killer5280

Ditchfield.

RCVTR

+1 for changing the final drive gearing.

+2 for contacting Roger D.

zmaniv

I thought I heard the longer length tubes on the high mount exhaust gave you a bit more torque while dropping the HP. Dont quote me just seems to stick in my head

davwas

Hi

Thanks for the tip about Roger

Re Gearing: Yes, I change the gearing to suit each track.

I also understand that HP & Torque are directly related; but having done a bit of looking around, wondered if anyone had some definatve tips?

For instance:
Would a set of 2 into 1 exhausts maybe lose 4 hp, but retain the same torque? That would be good for me, as I could take off some lead!

Would fitting high-lift cams gain too much power and not much torque?

Cheers

RCVTR

Increasing the duration on the cams will generally move the meat of the torque curve to a higher rpm range - thus producing more power.

High compression pistons should give you a bit more torque everywhere.

Light wheels have lower moment of inertia, which would gain you more acceleration than you would lose by adding more ballast to compensate for the weight reduction. Lower inertia is equivalent to more torque.