L98 rev limiters
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Joined: Mar 2005
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L98 rev limiters
I have a 90 l98- if it doesn't have a useful limiter (as I've heard) can I buy one? I can't watch the rpms that closely while auto crossing!
BTW: why would GM set the fuel cut-off @ 10,000 rpm- wouldn't the engine blow up before that ?!?!
Thanks
BTW: why would GM set the fuel cut-off @ 10,000 rpm- wouldn't the engine blow up before that ?!?!
Thanks
Last edited by ls5454; Mar 7, 2005 at 06:22 PM.
Burning Brakes
Joined: Apr 2000
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From: Chandler AZ
I don't know this but I think
I believe it is because the TPI manifold itself is a good rev limiter.
I couldn't get my tuned stock 90 TPI above 5500 easily. By then it was running out of umph. It should have been safe for another 500 rpm or so.
You can get an MSD6AL for it and have a limiter and a better ignition.
I couldn't get my tuned stock 90 TPI above 5500 easily. By then it was running out of umph. It should have been safe for another 500 rpm or so.
You can get an MSD6AL for it and have a limiter and a better ignition.
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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GM left it so high because the TPI limits you better than any spark or fuel cutoff.
With the TPI on there, theres hardly any way you can rev it high enough to run into valvetrain or bottom end problems associated with overrevving.
With the TPI on there, theres hardly any way you can rev it high enough to run into valvetrain or bottom end problems associated with overrevving.
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Thanks for the input guys. I'd still like to hear any/all alternatives/fixes. And as for GM, I hope you're right, but why bother putting one that high? At best it's a waste of code. All I know is it doesn't seem too hard to run up to 6K for me. Perhaps I had that S2000 too long.
Bill
Bill
Last edited by ls5454; Mar 7, 2005 at 09:28 PM.
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Melting Slicks
Joined: Aug 2004
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From: Indy IN
shift point
If this is a stock L98 you should be shifting at 4500 rpm for best acceleration. We did extensive testing at the strip and for a stock L98 that was the fastest.
If you are coming up on a corner and don't want to shift up and then back down, you can hold the gear for a bit but if you find that you are getting up near the redline you should have shifted up a long time ago....
You are better to learn to shift it by ear. After you get used to shifting at 4500 you will get to know the pitch and then you don't need to see the tach anymore.
If you are coming up on a corner and don't want to shift up and then back down, you can hold the gear for a bit but if you find that you are getting up near the redline you should have shifted up a long time ago....
You are better to learn to shift it by ear. After you get used to shifting at 4500 you will get to know the pitch and then you don't need to see the tach anymore.
Last edited by Solofast; Mar 8, 2005 at 08:34 AM.
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I agree with that, but I don't want my car to suffer during my learning curve. And I have baggage from rev limited cars like Miatas and high revving cars like S2000's. This my first season with this car or anything like it.
Waka, Waka, Waka!
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From: Richmond Virginia
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St. Jude Contributor
Originally Posted by ls5454
I agree with that, but I don't want my car to suffer during my learning curve. And I have baggage from rev limited cars like Miatas and high revving cars like S2000's. This my first season with this car or anything like it.
I don't know off the top of my head how much a MSD costs, but if you are really concerned, you might spend less money just buying a set of good Valve springs. I imagine in the world of high-performance valve train parts, a set of springs that can handle 7500 RPMs are easy to find. If you can get a set that are designed for 7500 RPM (Which you will NEVER hit in an L98) for cheaper than buying (and installing) an MSD, then you will have come out ahead.
Just a thought. - I'm not an enging builder, but there is usually more than one way to 'skin a cat'.
Race Director
Joined: Feb 1999
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From: Indianapolis IN
MSD makes a Rev Limiter box alone. Only cost @ $60 if I remember right, check eBay.
http://www.msdignition.com/rpm_1.htm
http://www.msdignition.com/rpm_1.htm
