LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

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Old Apr 16, 2003 | 12:18 AM
  #1  
godofdragons's Avatar
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hi rev

my new objective is to make my lt1 redline as high as possible, all internal engine parts are still stock. any performance is on the outside
Old Apr 16, 2003 | 02:05 AM
  #2  
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You will have to upgrade the valvetrain components to be able to safely rev more than the factory rev limiter is set at. (5886 rpm)
Besides, why would you want to rev it that high? You will be past the point where the engine makes most of the power anyway....
Old Apr 16, 2003 | 02:45 AM
  #3  
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I've done 7k as have others, to go beyond that you need a stand alone fuel/spark controller like DFI.

Without a heads/cam/headers etc setup, you have no reason to go beyond 6k or so, roller rockers will be "needed" for anything over 6200.

Be realistic with how much money you have to spend on this, RPM means almost not a damn thing, unless you road race and need to spend time in one gear.

What exactly do you mean by "as high as possible?" Should you have bought a Honda instead? Why would you want a car with no low end torque and only top end, you bought the wrong car for that purpose. Does high RPM make a Viper fast? Certainly not.

Nothing says mean street machine than a car that has power everywhere, if you have to rev to 8k to make 275 HP, who cares, because you'll be at the back of the pack.

Rotaries can make 550 HP NA out of a 2.0L 3 rotor setup, at 14k RPM.

Last edited by Dr.Mudge; Apr 16, 2003 at 02:49 AM.
Old Apr 16, 2003 | 03:35 PM
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a friend of mine has seen an lt1 rev at 10000rpm. i doubt that there is no power up there. anyway i want the power to be higher in the rev, better for highway and easier launches
Old Apr 16, 2003 | 03:48 PM
  #5  
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Originally posted by godofdragons
a friend of mine has seen an lt1 rev at 10000rpm. i doubt that there is no power up there. anyway i want the power to be higher in the rev, better for highway and easier launches
Considering NASCARS rev to 8500 RPM........10,000 RPM for a V8 seems extremely high....I think your friend saw nothing and is BSing you. The only V8's that rev those kind of RPMs are the Indy cars and the displacment on them is like 3.0L tho. Small V8's with BIG turbos turning 16,000 RPM. Your friend did not see an LT1 spinning at 10,000 RPM.

You must like Hondas or something that have to spin 8,000 RPM or more to make their peak power, most LT1's make peak HP in the 5000-6000 RPM range.

You want better highway power and easier launches then stick with 3:23 gears. Muscle car V8's are not made to skimp on torque, Torque is the whole REASON for having a V8. Maybe you should buy a honda.
Old Apr 16, 2003 | 04:52 PM
  #6  
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Or seriously an RX7 if RPM is what turns you on, no torque but they can make top end like no tomorow, for thier tiny little size that is.
Old Apr 16, 2003 | 06:38 PM
  #7  
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Originally posted by Dr.Mudge
Rotaries can make 550 HP NA out of a 2.0L 3 rotor setup, at 14k RPM.
Well, ~8,000 rpm anyway. The stock 1.3L 13B-REW in the '93-'95 twin turbo RX-7s has an 8,000 rpm redline. How do I know?

http://home.earthlink.net/~jimlab/pi...es_new_lit.jpg

Most forced induction rotary engines stay under 8,500 rpm, including the 2.0L 20B 3-rotor. The apex seals tend to float (pull away from the surface of the rotor housing) at higher rpm, sort of similar to valve float in a piston engine. An NA rotary can turn more rpm, but 14k rpm is questionable. Even Mazda's 4-rotor 787B which won the 24 hours of LeMans only turned 9k rpm.

http://www.geocities.com/fdkaimember/r26b.html
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