L98 Redline
Le Mans Master
Joined: Oct 2007
Posts: 9,670
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From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
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St. Jude Donor '09-'10-'11
I shift at 5000 RPM. The car falls on its face around there.
Instructor
Joined: Aug 2004
Posts: 150
Likes: 0
From: Pittsburgh Pa.
Five grand would be the upper end for these motors, assuming you mean 'stock'. I believe 4800 rpm is redline. Honestly, it's been my experience that you're wasting your time revving the snot out of it...I find mine runs best when I let my L98 do what it does best: Put out pretty respectable bottom-end torque, shift early (42-4300 rpm), and let it ride that torque curve. You wanna rev it? Move on to an LT1.
Thread Starter
Pro
Joined: Mar 2008
Posts: 552
Likes: 2
From: Dubuque Iowa
No, I was just curious. Its my first vette and I have only driven it twice... Just tryin to feel it out and get a sence for it. I just wanted to make sure I didn't over rev it so I was making sure.
Le Mans Master
Joined: Aug 2000
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From: Australia
Burning Brakes
Joined: Jan 2003
Posts: 755
Likes: 32
From: Roswell Georgia
ECM Programmed Redline Is 5800 RPM
The ECM is programmed to cut off fuel at 5800 RPM, but you're well past peak HP at that point as the other posts have explained. I'd stick with the previously recommend shifts points between 4500-4800 RPM to keep your Vette in it's best torque/HP band. Have fun! 
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Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
Le Mans Master
Joined: Oct 2007
Posts: 9,670
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From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
That cant be. I have revved mine to 6-6500 RPM before without any fuel cutoff. This wasnt for shifting it was in between corners in an autocross where shifting wasnt possible.
Race Director
Joined: Jun 2004
Posts: 13,934
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From: WI
From what I remember the L98 is 10,000 RPM cut out, the LT1 computer is programed at a different RPM.
Team Owner
Joined: Feb 2006
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From: sw Ohio
Drifting
Joined: Oct 2006
Posts: 1,554
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From: Romeoville IL
And you'll be floating the valves long before that. I've had mine float at the end of a straight doing autocross. One of the guys with an '89 changes his springs every couple of years because of float and beating on them for autocross.
Instructor
Joined: Dec 2007
Posts: 197
Likes: 1
From: Pennsylvania
I let a buddy take my tpi out for a spin, he came back revving the **** out of it (clutch in). I saw every light on the digital tach light up and cringed waiting for some valve train damage, but stupid abuse after 100k and it still runs great.
I wished I had set the limiter to 6500 on that one, he would have hit it.
Melting Slicks
Joined: Nov 2003
Posts: 2,679
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From: South Amboy NJ
Burning Brakes
Joined: Jan 2003
Posts: 755
Likes: 32
From: Roswell Georgia
My Bad! I Quoted the Redline for an LT1, Not the L98
I'm sure that there's a excellent story of why the L98 has such a high fuel cutoff programmed into the its prom. Maybe it was for the SCCA Corvette Challenge series or other such racing? Surely there was a logical reason!
Thread Starter
Pro
Joined: Mar 2008
Posts: 552
Likes: 2
From: Dubuque Iowa
You're correct. The L98 has a ridiculously high redline fuel cutoff of 10,031 RPM while the LT1 has a redline fuel cut off of 5850 RPM. :o
I'm sure that there's a excellent story of why the L98 has such a high fuel cutoff programmed into the its prom. Maybe it was for the SCCA Corvette Challenge series or other such racing? Surely there was a logical reason!
I'm sure that there's a excellent story of why the L98 has such a high fuel cutoff programmed into the its prom. Maybe it was for the SCCA Corvette Challenge series or other such racing? Surely there was a logical reason!
Those damn crazy GM engineers...
