Rev limiter

I have mine set to 170 and Valet to 4

What and who the F takes a GMT 400 to ( F hate converting to USA, love you) 100 MPH. I have posted this before. Speed Gov in my 5.7, because of the tires, I have never been able to put it in 5th on a hammer run. All Good, 26 years ago I would be kaput, in the turns.

PlayingWithTBI said:

I have mine set to 170 and Valet to 4

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I use my Valet key for my BRZ, So when I pilot from the Chev, and Jk. I have a constant. Now (as I drink Home Brew) the F. ing Clutch on the Chev was F ing Heavy. Damn that Gore Warming LSD guff.

F4U-1A said:

What and who the F takes a GMT 400 to 100 MPH.

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Those of us with a transmission capable of executing a WOT 3-4 upshift.

F4U-1A said:

What and who the F takes a GMT 400 to ( F hate converting to USA, love you) 100 MPH. I have posted this before. Speed Gov in my 5.7, because of the tires, I have never been able to put it in 5th on a hammer run. All Good, 26 years ago I would be kaput, in the turns.

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Those of us with a need,,,,a need for speed!

Supercharged111 said:

Those of us with a transmission capable of executing a WOT 3-4 upshift.

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Explain??

VIKING_MECHANIC said:

Since we're on the subject of rev limiters (and fuel cut off), on 96+ gmt400s, how is the fuel cut off activated? Is it mechanical or is it hardwired into the ecm. And how would one go about in deleting/adjusting the threshold?

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IIRC, my 1998 ECU has engine RPM and vehicle speed limiters with hysteresis, i.e., an upper "cutoff" threshold and a lower "re-enable" threshold, for each. These are tunable.

I might assume all 96+ are similar.

I presume the ECU cuts fuel / stops firing the injectors.

Having the ECU retard the spark would be an interesting approach. Blowing both airbags and/or engaging the ABS would be as well, and maybe turning on the hazard flashers too.

Supercharged111 said:

Those of us with a transmission capable of executing a WOT 3-4 upshift.

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I had no problem hitting ~120 with the 4L65E and 3.42s with 3rd gear only. ~5,000 rpm was ~120. Tuned but otherwise stock L31 had the power to run there.

F4U-1A said:

Explain??

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Ever tried it with a 4L60?

L31MaxExpress said:

I had no problem hitting ~120 with the 4L65E and 3.42s with 3rd gear only. ~5,000 rpm was ~120. Tuned but otherwise stock L31 had the power to run there.

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That's right what my 1500 did back with 3.73s, 265/75/16, and the not yet broken 4L60 here at altitude.

F4U-1A said:

What and who the F takes a GMT 400 to 100 MPH.

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Slowly raises hand...



I didn't remove the speed limiter on either of my trucks.
But, with a Hyper-Tech programmer, I raised the limit to 135mph. A speed neither would ever see.
But 100mph? Sure.
110? Oh yea.
115? Probably do hit that. Or more. But at that point, I'm kinda busy. These trucks are about as aerodynamic as a brick.
Yea...that is kinda pushing it.
But if you want to know where the edge is, ya gotta go find it.
I have scars because of that attitude. Good ones. Big ones. Found the edge & fell off. "Oops. There it is!"

Kelowna to Vancouver. The Coquihalla highway.
337 miles. A 4 hour drive done in 3 hours & 9 minutes. In my truck.
4 lanes wide. Use 'em all.
Still, no matter what speed you cruise at, there's always a few during those 3 hours that'll be going faster.
I've done that drive & only saw maybe a dozen other vehicles & 2x that for semis.
There's more exotics per capita between Kelowna & Vancouver than any other place in North America. Porsches, Vettes, Vipers, Ferraris, Lambos, Mclarens & others are common.
Compared to those guys, I'm in the way.
The go-fast stuff is best done in late spring or early fall.
No tourists & good weather.
Start @ 4:30 am when heading east to west. No sun in the eyes.
On a Tuesday or Wednesday. Even less traffic. Fewer cops.
Watch for the semis.

Why? I dunno. Youthful exuberance?
You have to grow old. Don't have to grow up.
Or maybe...just because?
Actually, I find it calming. Zen-like. Total concentration on the situation. In the zone. Where nothing but the moment at hand is what matters. Thoughts cleared of the daily B.S.
It's also about getting it right.
Late-tapping the binders just before leaning into an S-corner, hitting the perfect apex on both & then on the skinny just a little too soon so as to carry enough speed through that uphill sweeper in the other direction.
In a vehicle that wasn't originally designed for this, but one that I modded so that it will.
100 miles per hour, for an hour. That's the goal.
Yup. Kind of a foolish one. But still, a goal.
...and I've been accuse of being aimless. Pffft.