I can't find any information on the subject. I searched the entire forum. I found a thread on the 2.5 but not the 2.8. Just curious, i let a girl drive my car and she revved it 6300ish RPMs before i yelled at her to shift. I couldn't hear a rev limiter, but it could be set higher?

Thanks,
Mitch

yes there is a rev limiter or at max revs when you reach it the engine just suddenly dies off and if you don't shift or depress clutch you will start compression lock up of rear wheels.

[This message has been edited by Australian (edited 08-02-2012).]

I vote no.

Throttle got stuck on my 2.8. Engine was a fresh rebuild. Pushed the clutch, engine screamed to about a billion rpm's and I shut it down. Pulled over, unstuck it, started it back up, and it knocked like crazy.

Ended up needing an engine 1 month after buying the damn car.

Also this topic comes up fairly often and never quite gets a sound resolution. I say someone should film as they rev it all the way and post the video here. Anyone up to the task?

[This message has been edited by TheRealShadowX (edited 08-02-2012).]

There is no rev limiter on the 2.8 motor!

I have a rev limiter on my 87GT. I have hit it a couple of times in 2nd gear. Somewhere around 6000 rpm and maybe 60 mph in 2nd. It scared the hell out of me the first time I hit it.

quote Originally posted by Old Lar: I have a rev limiter on my 87GT. I have hit it a couple of times in 2nd gear. Somewhere around 6000 rpm and maybe 60 mph in 2nd. It scared the hell out of me the first time I hit it.

Yes that is what happens.

I think the reason we can't get a solid answer on this is because some have them, and some don't. I have no idea what criteria to use to determine if you should or not...but...my 85 SE v6 had one, my 86 SE v6 didn't. My 85 would shut itself down right at 6k rpm (scared me the first time too)...and my 86 went to about 8500 before it shut down. The 85 shut down a bit more gracefully, though.

If she got it to 6300rpm, then yours does not have a rev limiter.

It's definitely on some of them. I read that it's on all of them except for those built in 1988.

Before I had the 3.4 installed, I did a quick run up to redline in the 2.8 and hit the limiter which essentially cuts off the fuel until the revs drop to around 4500 rpm. Mine is an 87 GT Auto Ex 2.8.

Yep, its way the hell up there but its there.

So what is it?....just a line of code in the ECM?

If that is true, you should be able to go get the computer you want.

My 88 GT with a 3.4L V6 440T auto, doesn't have one. I saw something past 6000rpm in first gear and when that car was built, I was told by the builder (after the fact) that there was no rev limiter in that car. I just don't take the rpms up there.

The other confusion comes from the accuracy of the tachometer. You can see 6000+ on the tach and think you don't have a limiter, when in reality the engine is only spinning at say 5500 and hasn't reached the point of activating the rev limiter. The stock tachs are not the most accurate at higher RPMs.

I used to beat the crap out of an 86 2.8 (original 4 speed car) and shift it at 6300 on the tach... never hit the rev limiter, but it could be because the tach was old and reading higher than the engine was actually spinning.

quote Originally posted by mitchjl22: I can't find any information on the subject. I searched the entire forum. I found a thread on the 2.5 but not the 2.8. Just curious, i let a girl drive my car and she revved it 6300ish RPMs before i yelled at her to shift. I couldn't hear a rev limiter, but it could be set higher? Thanks, Mitch

That can be downright dangerous!

I let my buddy drive mine, he brought it up to 6700 before I started yelling at him to shift. 87 GT no limiter. Some of them have it, some don't.

The 86-88 V6 ecm, 1227170, does have a rev limiter but it is not a Formula 1 class limiter, it is slow to act and even slower to release. It is set to something like 6250 for manual transmission cars and about 5600 for automatics in 86-87 cars and something like 150,000 rpm for all 88s. There is also a speed limiter which comes from the factory set to 255mph. I made a special prom for my car when I took it in to be painted with settings of 3000rpm and 30mph. It did work for both conditions.

quote Originally posted by rwhughes: I made a special prom for my car when I took it in to be painted with settings of 3000rpm and 30mph. It did work for both conditions.

Pure awesome right there..

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Currently in the middle of my 88 + 3800NA swap

quote Originally posted by rwhughes: I made a special prom for my car when I took it in to be painted with settings of 3000rpm and 30mph. It did work for both conditions.

X2 - got to remember that.

My 1986 se v6 does not have a red limiter. A rev limiter should always cut in before the red line if its working properly.

Sorry, but you guys are all off.

All manual 85-87V6s have a rev limiter. The rev limiter is set at 6200RPM. For 88 Formulas and GTs, there is no limiter.
I never did it on my original 88GT, and don't plan on doing it either.
I'm not sure about the automatic cars, but why would you want to go in that RPM range to begin with?

The limiter is there for a safety device. The peak range of a V6 fiero is between 4500 and 5200RPM. You don't need to go any
higher. You are at the point of over reving. The maximum RPM in a fiero that I ever did was 5400RPM.

If you need / want to go higher than 6200RPM, you seriously asking for problems or engine damage.

Someone that thinks they want more power outta the 2.8L V6 engine, its time to do an engine swap,
like a 3.8 S/C or change car.

(Edit for spelling)

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fierogt28

88 GT, Loaded, 5-speed.
88 GT, 5-speed. All original.

[This message has been edited by fierogt28 (edited 08-04-2012).]

quote Originally posted by fierogt28: All manual 85-87V6s have a rev limiter. The rev limiter is set at 6200RPM. For 88 Formulas and GTs, there is not limiter. ...

Bingo!

I've got a multitude of BIN files. The 85-87s have the limiter. The 88s do not.
Having said all that, I think it's a good idea to have one. When I built my 3.4 for my 88, I added one to the programming.

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Raydar
88 Formula IMSA Fastback. 4.9, NVG T550

Praise the Lowered!

Not that this pertains to the question at hand, completely... but I have a 89 S10 with a 4.3, and it had a mechanical limiter, which after getting hit a few times, stopped working. I heard the limiter twice then never heard it again. Could be the case with the 2.8s, as well. My girlfriend's S10 has a 2.8 and it has a rev limiter occasionally. Sometime it's there and sometimes it's not. But her S10 is a 91 so it might be a different setup for limiting it.

I wonder why GM decided to dump the limiter on the manual 88s? It's true that my Formula does fine up to about 5500, and after that is a waste of time. Maybe the changes they made in the engine....neutral balanced flywheel, better oiling, gave them more confidence about the high rpm range, but it sounds so un-GM like to remove a feature that prevents damage....no matter how unnecessary.

Wow, what a topic. I never knew Fiero's had a rev-limiter.
Would you believe that the 60 Pontiac I learned to drive at age 17 had a built in (non intentional) rev limiter? No sensors, no computers, just a 389 with auto trans.

All I had to do was put the pedal to the wall and manually shift at max rpm. Well just before I was ready to shift into 3rd (4 spd hydramatic) it was like someone reached over and turned the key off. From the howling for mercy scream of a V8 to an engine of dead silence. After coasting for 5 to 10 seconds the lifters would bleed down and the engine would come back to life.

It was called "Valve Float". The engine would outrun the valve train to a point where the valve springs could not return the valves to their seats fast enough. I'm glad valve clearance was not an issue back then.

Read more here..
http://www.circletrack.com/...e_float/viewall.html

Spoon

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"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut

I'm happy to read and see all the replys. I feel really special to have stated such a thread. Hopefully others can find it as useful as I did in the near future. Thanks for all of those that contributed.

Warm regards,
Mitch

The correct info is
85 is 6012.48 RPM
86-87 auto is 5851.43
86-87 manual is 6012.48
88 is 1310720.00 RPM

This is pulled from the stock ECM codes.
and cuts fuel untill it drops to about 4800RPM (I forget to check each one.)

edit to add: this is for 2.8Ls
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"DRIVE IT LIKE A FIERO"
'84 Fiero, engine to be determined
'87Blue GT 3.4L Swap Completed!!!!!!!! Boosted!!!!!!!
^^^^ Now in the Construction Zone^^^^
Las Vegas Fiero Club Parts/Sales/Service/Club
Fiero Road Club Of Northern Nevada

[This message has been edited by sardonyx247 (edited 08-05-2012).]

quote Originally posted by sardonyx247: The correct info is 85 is 6012.48 RPM 86-87 auto is 5851.43 86-87 manual is 6012.48 88 is 1310720.00 RPM This is pulled from the stock ECM codes. and cuts fuel untill it drops to about 4800RPM (I forget to check each one.) edit to add: this is for 2.8Ls

Okay fellow Fiero owners (Don't shoot me) but I got curious! I went all the way to 60mph in 2nd gear (Past 6000 on the tach.) No limit. Nothing, just sounded like the engine was going to run out of air.

Two things.

1) seems dumb to remove the rev limiter from the 88 model
2) why set the limiter so high? 6000 RPM is like a death sentence for the bearings on a 2.8. Someone on PFF was saying that above 4300 RPM is severely shorting the bearing life already.

My dad drove my car.... I turned the stereo up, he couldn't hear my engine... he hit it. It exists. We were getting on the freeway and he was in second, and it was pulling good all the way up until 6200ish and then he hit it, then it felt like a brick wall.