| Re: Transmission question |
Subject: Re: Transmission question by BeachBum on 2008/12/31 19:27:14 Quote:
In my opinion, naturally aspirated, I definitely think a looser torque converter will help you significantly. Honestly, the more converter you give it, the faster you'll go up to a point. On your set-up, without knowing more, I would say that would be around 4400 rpm converter. Don't get me wrong, I'm not saying loosen it up that far, that would be a bit sloppy on the street, but your 60's would go down, bearing in mind, 80%+ of your et gained or loss for a given HP value will be earned in the first 60 ft. I think a 3400-3600 rpm converter would really wake it up off the line.... your 383 HSR set-up will actually be capable of 1.4x 60's if you optimized the converter, but with a 3400-3600, you should be deep 1.5's on motor. You may be aware of Vic89 on the CF.... he has a 350-ported heads-MR-ZZ9 combination that used to be owned by Wheelsup on the east coast..... when Wheels-up had that motor in his C4, he broke into the high 10's with a 4000+ converter in it and a little weight loss, I knew Wheelsup pretty good back then and drilled him on the set-up... it was the real deal. He sold the motor to Vic, who's raceweight was only another 100 or so pounds.... Vic put in I think a 2800 rpm converter and the motor couldn't get out of its own way..... I think he was stuck in the 12's..... he loosened up the converter to approxmiately 4000 rpm, immediately the motor runs mid 11's in summer air and has gone a best of 11.3x in good air. My point to the above, the loose converter is the secret to Vic running mid to low 11's on a stock 350 shortblock, mild hyd roller cam, ported heads....your HSR, albeit it makes a little bit more torque than the MR Vic used below the peak, the torque curve is still pretty close to an MR.....and thus have a similar effect to converter flash rpm. The end result, if I was you, I'd get your new motor completely dialed in before even thinking about the Nitrous..... a 383 HSR in a C4, with a 3400-3600 rpm converter should be good for very bottom 11's on motor alone and even maybe high 10's in good air..... throw a 175 shot at it after that, and you're not going to be thinking about mid 10's at 128 mph, and instead high 9's, or at least low 10's at well over 130 mph. |
