I apologize if I made it seem as though this was a question regarding money..
I brought this up because..of the new Zero shift tranny press reports speak of a one second improvement in zero to 100mph times in a TVR because there is no need to interupt powerflow during acceleration..
I was wondering what that would equate to with regards to improved performance from HP.
The difference in performance and feel is very noticeable with the TVR Cerbera where, with the conventional gearbox, the violent acceleration through the low gears really emphasises the yaw of de-clutching between first and second gear accelerations. With ZeroShift, the car just keeps accelerating - it`s pretty addictive! You lose no momentum or sense of thrust through the gear-changes. Two ZeroShift gear-changes between standstill and 100mph are worth more
than a second.`
A standard Cerbera 4.5 has been timed at 8.4 secs to 100mph, so McLaren F1 drivers should not be complacent if they see a chrome ZeroShift badge on the car beside them at the lights. To wring the best 0-100 time from the F1 needs deft gear-changing skills - the ZeroShift driver will have optimum shifts, every shift. This will be the badge to look out for!
The rule of thumb I've always heard is it takes 10 HP to gain a 1/10 second....or 100 HP for 1 second gain in the quarter.
If a stock Z06 with a good driver can do the quarter in say 12.5 seconds, and the BHP is 405, then an LPE TT with 805 BHP should be able to do the quarter approximately 4 secounds faster.
12.5 seconds minus 4 seconds = 8.5 seconds. I believe LPE has done it in 8.95 seconds. Sooooo, it's a pretty close rule of thumb and there are many variables to consider such as traction problems, aero dynamic problems, gear ratios and I'm sure there are many more.
I think there's a lot more of a curve to it. 30hp can shave a half second off a high 14 second car but it won't get you 3/10 off a car running in the elevens. It fits more with cars that run in the 13s stock and the early 90s is when I think I heard that quoted the most. Like the LT1 inching a few hp higher each year or comparing the various Jap twin turbo cars. The weight too since you need more hp to push a ZR1 than a Z06 your 1.0 second is going to come cheaper on the Z06. With the really powerful cars you have the traction issues and of course the wind resistance when you are trapping over 120mph. The Viper guys will tell you at least .2 difference between a coupe and a roadster, because of the wind resistance at 115mph+. With another 100 hp I'll bet the 2 Vipers are .4 apart. I was going to go into a "what about torque" speech but compare these old road tests http://popularmechanics.com/automoti.../index12.phtml
The hardtop and the Lotus have almost identical hp and the performance is just an eyelash apart in spite of the extra Chevy torque. The Firebird is as quick as the 355 with 50 less hp and more weight. The 355 Spyder would have lousy aerodynamics mind you but the numbers are all over the place. Then of course there are the two F bodies??
Sorry to babble. Since this started with a Z question-A 12.9 second FRC does not need another 100hp to run consistent 11.9s. An 11.9 second Z06 needs more than another 100hp to run consistently in the 10s(maybe)
Originally posted by No Doubt The LPE TT that ran the 1/4 in 8.95 had ~1200 h.p. and was on full slicks. It also had a Rossler automatic trans.
Ding, ding, ding.... We have a winner! If anyone gets a Z06, or any C5 WITH A 6-SPEED for that matter, below the 9.4 second mark, please let me know because I'll get on my knees and, well.... bow to you :D
Twin Turbo 346 cid Z06 - 8.49 @ 156 mph - First Z06 in the 8s
All else equal the rule of thumb is that 100RWHP ~ 1 second in the quarter. But when you get down below the 10 second range that number increases. If you run a 9.90 with 500 RWHP you are probably not going to rung a 8.90 with 600RWHP all else equal.
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