Peak Torque
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Burning Brakes
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From: Long Island New York
Peak Torque
anyone have any idea @ what rpm my engine would produce Peak torque? Is is a 1988 L98 Basically stock, except for flowmasters, Cut lid with K&N, air foil, and SLP Runners; no porting work that i am aware of. I am currently in the process of a trans swap (very soon) and just looking to try and determine what stall i should be at with 2.59 gears......
Thanks guys!
Thanks guys!
Thread Starter
Burning Brakes
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From: Long Island New York
Originally Posted by vader86
L98s peak at about 3000-3200rpm.
Do not go higher than about 2600 stall.
Do not go higher than about 2600 stall.
vader, what would be the worst case side effect of going too high?
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Your ETs will not be as good. You do not want the stall to be at the peak, you want it at least 500rpm below the peak.
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With a few boltons, 4yrs ago, my peak torque came at 3,500rpm with peak power at 4,500rpm.
Now peak torque is at about the same point but peak power has moved up to around 4,800rpm, due mostly to the siamese intake base.
I run a 2,000rpm TC in front of 2.59 gears and love it. I can pull 1.8x sec short times at the strip and yet it feels "tight" for nice street maners. And still I can blow the tires off on a street launch.
If your TC has a high stall it will feel "loose" on the street whenever the TCC is unlocked. Some guys like this feeling but I prefer the tigher feel. Our Vettes are relatively light so a very high stall isn't really necessary for a strong launch, even with 2.59 gears.
Now peak torque is at about the same point but peak power has moved up to around 4,800rpm, due mostly to the siamese intake base.
I run a 2,000rpm TC in front of 2.59 gears and love it. I can pull 1.8x sec short times at the strip and yet it feels "tight" for nice street maners. And still I can blow the tires off on a street launch.
If your TC has a high stall it will feel "loose" on the street whenever the TCC is unlocked. Some guys like this feeling but I prefer the tigher feel. Our Vettes are relatively light so a very high stall isn't really necessary for a strong launch, even with 2.59 gears.
Thread Starter
Burning Brakes
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From: Long Island New York
Originally Posted by vader86
Your ETs will not be as good. You do not want the stall to be at the peak, you want it at least 500rpm below the peak.
:
Waka, Waka, Waka!
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Originally Posted by vader86
L98s peak at about 3000-3200rpm.
Do not go higher than about 2600 stall.
Do not go higher than about 2600 stall.
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Burning Brakes
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From: Long Island New York
Originally Posted by Fozzy_Bear
I'm pretty sure the SLP runners push the peak up a bit from the stock point. I wouldn't be supprised if your peak Tq came as high as 3900 (probably about 3700 though). Still, with a L98 I wouldn't go much higher than 2600 anyway. I have one in my '86 and it would be a bit high if it were my Daily Driver. As a weekend cruiser though, it's just about right.
Thanks for the advice fozzy! How do you like the Art Carr?
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Originally Posted by Fozzy_Bear
I'm pretty sure the SLP runners push the peak up a bit from the stock point. I wouldn't be supprised if your peak Tq came as high as 3900 (probably about 3700 though). Still, with a L98 I wouldn't go much higher than 2600 anyway. I have one in my '86 and it would be a bit high if it were my Daily Driver. As a weekend cruiser though, it's just about right.
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Originally Posted by Jloshotz
Thanks for the advice fozzy! How do you like the Art Carr?
Later this year, I'm going to rebuild the engine. I have got trickflow heads waiting to go on and I am currently deciding on the choice of cam that will go in. I'm probably going to be pushing around 435-450 ft/lbs of torque when I'm done, so time will tell..... but I'm not expecting any issues.
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Originally Posted by vader86
No, they cant move the peak up that much, 3300-3500ish maybe.
I'd bet the peak would be a bit higher than 3500, but as a general rule;
If Vader86 and I ever disagree, your probably better off believing him.
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Burning Brakes
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From: Long Island New York
Originally Posted by Fozzy_Bear
Jloshotz,
I'd bet the peak would be a bit higher than 3500, but as a general rule;
If Vader86 and I ever disagree, your probably better off believing him.
I'd bet the peak would be a bit higher than 3500, but as a general rule;
If Vader86 and I ever disagree, your probably better off believing him.
LOL Got ya Fozzy. I tell ya, i think i'm going to have to re-stall....
with the HP you are talking about, it sounds like you've got yourself a bonafide Z06 hunter, and you are only running a 2600 TC...the one i am getting is advertised 3200-3500. It certainly sounds like it may be too much. I really hate this down time 
Thanks for your replies 
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Originally Posted by Jloshotz
...
with the HP you are talking about, it sounds like you've got yourself a bonafide Z06 hunter, and you are only running a 2600 TC...
with the HP you are talking about, it sounds like you've got yourself a bonafide Z06 hunter, and you are only running a 2600 TC...
Of course, none of that really matters to me. I bought a convertible because I wanted a weekend cruiser, not a racer. That's why I kept the long runners. For street driving, having all of that torque down low is a real hoot! Heck even with the mods I have now, this car is the most fun I have with my pants on.
But before I go and give out WAY too much information, let me just say that I am sure that it will be unquestionably too loose of a converter if you install a 3500 rpm stall. Even if you HAD an intake and cam that was designed for that (like a TPIS MINIRAM) the brutal launch of a 3500 TC would blast your D36 differential to tiny bits before the end of the first track day.
Last edited by Fozzy_Bear; Apr 24, 2005 at 04:08 PM.
Thread Starter
Burning Brakes
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From: Long Island New York
Well i certainly don't like the sounds of blasting the rear out of the car (not that i really plan on launching it that hard) so that is one more thing for me to take into consideration. I really appreciate all the insight!
