Cost Effective HP Gains - Bolt-On's vs. FI - Page 3 - G35Driver

#31

07-14-2004, 03:53 PM

ChicagoX

Don't drink and Mag Race

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Re: Cost Effective HP Gains - Bolt-On's vs. FI

Q45 tech wrote: "This power back off just before and during the shifts is HOW the tranny...survives the 333 lb/ft [that could occur at 4,000 rpm] because shifts never occur at that power level........300HP @ 6400 rpm = 5252/6400= 0.82 x 300 x 0.9= 234 lb/ft less what ever the lesser ignition advance creates ~~ <200 lb/ft."
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If you look at the RPM drop, the shifts occur EXACTLY at that power level.........when it goes into the next gear. Granted, the electronic wizards soften the blow by pulling timing, but you are confusing the issue with more math. The tranny is sure seeing all the power after the shift.
Max acceleration is due to max torque, not HP. The shift places the trans right in the torque peak.

Forget the shifting for a sec....is the Minnesota car going to explode BEFORE the shift, when it is making more than 'max' power? I don't think so.
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Q45 also said: 300HP @ 6400 rpm = 5252/6400= 0.82 x 300 x 0.9= 234 lb/ft less what ever the lesser ignition advance creates ~~ <200 lb/ft.
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If you are going to quote formulas and numbers, at least make sure the math is accurate: 5252/6400 x 300 x 0.9= 221.56 NOT 234
Why the 0.9 modifier?
w/o the modifier, the math adds up to 246 ft/lb @ 6400 rpm before the electronic timing adjustments.

ChicagoX

'04 G35X Graphite/graphite, NAV, wood, premium

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