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Old 06-12-2018, 09:00 PM   #1
slimedcj
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Default 96 sl2 1.9 DOHC 5spd rev limiter

So I race circle track 3/8 mile and have been running the same for 3 years now.

Iíve always run the car in 3rd gear and never had any issues. This past weekend at about 1/2 down straightaway the rev limiter would come on and this never happened before.

The 2nd 50 lapped I put a taller tire on it and it would come on maybe 3/4 of the way down the straightaway.

What is the pcm Reading to make the limiter come on? I did replace the motor over the winter and clutch. Do I have a possibile cam or crank sensor going bad? Computer?

ThankS for any and all info

Brian

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Old 06-12-2018, 11:51 PM   #2
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Default Re: 96 sl2 1.9 DOHC 5spd rev limiter

If you've the stock PCM, the rev limiter is 6750rpm +/-50rpm (automatic's are closer to 7000).
Swapping to a MP2 will give you the same 1st gear but longer 2nd and 3rd gear...not sure how many RPM's the gain is but MP3 in 3rd only hits 80-85mph while MP2 3rd gear hits 95-100mph (with a DOHC engine/limiter).

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Old 06-13-2018, 06:46 AM   #3
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1995 SC2
Default Re: 96 sl2 1.9 DOHC 5spd rev limiter

Performance Specs of the Saturn 1.9L engine:

RPO LL0(1991-1999) - 122 lbs. ft. of torque @ 4,800 rpm/124 HP @ 6,000 rpm

Fetch has already covered the rev limiter being set at 6,750 rpm on all engines.

However, running the gears to the rev limiter is not only a recipe for destroying your engine, it is also a waste of gear. You will maintain the best performance, by shifting from peak HP rpm, back to peak torque rpm.

But, running the car to its rev limiter rpm is definitely not helping.

Shift into 4th. You may lose a little time shifting, but you will save the engine and valve train in the process. And it takes quite a while to get from 6,000rpm on a DOHC to 6,500 rpm, let alone 6,750. This is due to the fact that as engine rotational speed(rpms) increase, the engine's torque will decrease. HP is the amount of work the engine is doing. Peak HP is achieved by spinning the engine faster than its most-efficient speed(peak torque rpm), but once you pass the peak HP rpm, torque drops off sharply and so does your lateral acceleration.

When I raced my 1995 SC2, at a local drag strip, I lost 3/10 of a second running my car to 6,500 in each gear(Performance mode over Normal mode on the automatic), as opposed to allowing the normal shifts to occur at 6,000 rpm.

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Last edited by Saturn Night; 06-13-2018 at 06:54 AM..

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Old 06-13-2018, 11:46 AM   #4
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Default Re: 96 sl2 1.9 DOHC 5spd rev limiter

Itís had the MP3 in all its life and never had rev limiter come on

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Old 06-13-2018, 03:04 PM   #5
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Default Re: 96 sl2 1.9 DOHC 5spd rev limiter

Describe what you mean as rev limiting. Where's the tach needle when your engine hesitates?

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Old 06-14-2018, 06:33 AM   #6
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Default Re: 96 sl2 1.9 DOHC 5spd rev limiter

Quote:
Originally Posted by slimedcj View Post
Itís had the MP3 in all its life and never had rev limiter come on
If you're getting faster, then the chances of hitting the limiter become greater. From your description of the tire change delaying when it happens, it does sound like the limiter. But I'd take a glance at the tach as suggested by fdryer.

If you're hitting the limiter, options are few. Auto PCM raises the rev threshold slightly, the larger tires, or the tranny swap. Though the tranny swap might be too large of a jump, you might be able to combine the tranny swap with a smaller tire and end up where it's working for you.

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