Finally got to the dragstrip. First time on slicks since Oct 2010. Current setup just not working well. Not enough gear for the turbo/cam combo. Engine makes torque too late to effectively launch with a 293lsd. Alternated between smoking the clutch or bogging the engine. Best run was a 12.16 @ 116.85.
I am going to change diffs to a 410lsd and try one more time this year.
Damn, the PB turbo cam doesn't make crazy torque at low-ish rpm like the stock B35 cam? That is my favorite part of the turbo M30...tires boiling and car sideways at 3k!
Kyle in NO wrote:Damn, the PB turbo cam doesn't make crazy torque at low-ish rpm like the stock B35 cam? That is my favorite part of the turbo M30...tires boiling and car sideways at 3k!
Makes me re-think copying your setup.
My cam made great top end power before I advanced it. It was superior to a stock b35 or b34 cam above 5500rpm. I advanced it four degrees and lost all the top end advantage and didn't seem to gain enough bottom end to support the 293lsd. The cam seems perfect for a road course car or someone who wants a 24v type power band from a m30 but it's not the best cam for drag racing. I plan on making several changes to the car this winter and one of them is going back to a stock cam. Probably a b34. I want my 400rwtq at 3000rpm again! This cam makes 400rwtq at 3700rpm which is enough of a difference that it isn't ideal for my setup and intended use.
I want to be clear that there is nothing wrong with the cam it's just not want a personally want out of a power band.
mooseheadm5 wrote:Have you tried retarding it a couple of degrees from where it originally was?
I advanced it 4 degrees from the original location to improve drivability and move the tq curve down. That's it's current location.
In it's original location the power band was very suitable for the street. The lack of low end tq made the car more drivable and it was probably quicker on street tires as a result but once you add slicks to the equation you need ample low end tq to accelerate the car from a dead stop without bogging it.
mooseheadm5 wrote:Have you tried retarding it a couple of degrees from where it originally was?
I advanced it 4 degrees from the original location to improve drivability and move the tq curve down. That's it's current location.
In it's original location the power band was very suitable for the street. The lack of low end tq made the car more drivable and it was probably quicker on street tires as a result but once you add slicks to the equation you need ample low end tq to accelerate the car from a dead stop without bogging it.
Damn, I'm close enough to Lebanon Valley to get out and watch this happen. Todd, when are you going next/last out there, I've been meaning to take my wife to see the drags...
briansmith wrote:Damn, I'm close enough to Lebanon Valley to get out and watch this happen. Todd, when are you going next/last out there, I've been meaning to take my wife to see the drags...
Jeremy wrote:Know what could help fatten up that low midrange torque curve to get you off the line?
A little shot of nitrous oxide.
I hear Megasquirt can give you a little shot in a specific rev range, then taper to join the main on cam torque plateau.
For sure but I will keep it simple and swap to a stock b34 cam over the winter when I install the fresh short block Paul built for me. That way I'll have the mountain of tq right where I like it.
