545 Rolling road

[keane]

Hi Guys, just wanted to update a little on the Dax, got it up to a local rolling road last Sat just to set a baseline and see what was happening. The guy normally does scoobies etc so it was basically a few pulls to get some feedback, the power/torque both peaked way early at around 4200, the setup should rev to 6k and peak around 5300, and after getting home and checking the carb linkage, the secondaries had only just opened at almost full throttle at the pedal, so stretched cable etc probably. I will check the timing, and fuel delivery but main point was the engine held up ok, no nasty leaks or noises, the hp was 517, the torque 730 ft lb, I know the sidepipes will need opening out so all in all lots of power on the table yet. to refresh, its got TFS street heads ported by Scott Johnson, Victor manifold, xr292 solid roller cam, 1050 dominator(Pc carbs), scorpion rockers, 11-1 probe pistons, probe rocker girdle, backed currently by a Broader C6, to be changed for a TKO 600 in the future, so all in all pleased, with the cost of gas here in UK what it is I am Mad but what the hell. Dave

[ItBites]

Nice pulls. I assume the 545 reference is the cid? Lots-o- power and torque there!

Just a thought for you to check into: I think you may be blowing the torque converter away with the big engine. The reason I say that is that I have a 540 cid engine in mine and pulled 540 hp and 780 ft-lb torque (at the rollers) and I thought the 780 torque at the tires was more than I expected. After a while, I had shelled out the torque converter to the point that it 'locked-up' at 5200 rpm (originally was supposed to lock-up at 3000 rpm). I had a special torque converter made and it locks-up at 2600 rpm now. Haven't had the car back on the rollers, but I think the dyno pulls were 'flashing' the converter and allowing the engine to rev higher than the rollers thought (based on the gearing). This artificially elevated the torque at lower rpms. Anyhow, watch where your rpms flash to when you stand on it and see if you are blowing through the converter... And be careful. That much power can be a handful in these cars!

[keane]

Thanks for that, interesting point, something to consider, will let Ya'll know. Dave