View Single Post
WERK I WERK I is offline
Forced Induction Junkie
WERK I's Avatar
Join Date: Jan 2003
Location: Wisconsin
Posts: 3,291
Originally Posted by copbait73 View Post
So true. Dave, I know you are a sharp guy. Don't take offense, I ask you to analyze your statement. It is common to turboing.
"With the torque of these cars under boost, they really don't need another gear."
Turbo engine systems are great, but they are root of this problem. Most street driving is 90-95% off boost, so this is your starting point.
The major driver to building boost is the exhaust flow generated by increasing engine RPM. Forget pulse and rotor inertia, these are minor. We call it "bootstrapping". To get flow you need flow, compounding. Low weight and gearing improve this situation.
Absolutely no offense taken. I absolutely agree with your statement.
I have and 8:41 R&P in the 930trans cause I really don't care about top speed. If anything would be changed, it would be 1st gear because it is too low. Great for long clutch life, but not much else. I would then have a close ratio 4 speed that wouldn't be so annoying driving around town.
But we have to keep in mind why so many new cars have more gears.......that ugly acronym, EPA, wanting more and more MPG's, lower emissions. They would be just as much fun with 5 or even 4 speeds with the flat torque curves the water-pumpers possess.
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 02-28-2010, 03:47 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #31 (permalink)