C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Mild 383 Dyno Numbers/Pics

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Old Apr 14, 2007 | 12:07 AM
  #21  
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I pulled 276h/355t with a 350, stock heads and cam. You shouldn't be happy with your results. Find out why you aren't make the power that you should be.
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Old Apr 14, 2007 | 07:08 AM
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Originally Posted by hippy
I pulled 276h/355t with a 350, stock heads and cam. You shouldn't be happy with your results. Find out why you aren't make the power that you should be.
You said it, I was thinking the exact same thing. I dynoed 240rwhp/330rwtq with an untouched stock L98 engine.
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Old Apr 14, 2007 | 07:14 AM
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Originally Posted by 88BlackZ-51
You said it, I was thinking the exact same thing. I dynoed 240rwhp/330rwtq with an untouched stock L98 engine.
I thought they made 240 hp and 330 at the flywheel stock?
Sounds like gm underrated the power, or the dyno may not have been accurate.
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Old Apr 14, 2007 | 07:19 AM
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Originally Posted by hippy
I pulled 276h/355t with a 350, stock heads and cam. You shouldn't be happy with your results. Find out why you aren't make the power that you should be.
I'm not making the power because I'm not getting enough air. The motor is done at 4500rpm because of this. I have another thread discussing intake options if you want to contribute. Thx!
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Old Apr 14, 2007 | 07:22 AM
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Originally Posted by 88BlackZ-51
You said it, I was thinking the exact same thing. I dynoed 240rwhp/330rwtq with an untouched stock L98 engine.
Hmmm. A brand-new, stock L98 6sp should be worth about 215-220rwhp...A4 about 205rwhp. You must have a real freak!
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Old Apr 14, 2007 | 07:34 AM
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Originally Posted by Pete K
I thought they made 240 hp and 330 at the flywheel stock?
Sounds like gm underrated the power, or the dyno may not have been accurate.
Say what? I made 240rwhp/330rwtq at the wheels with my stock L-98 engine. The valve covers have never been off the car. There are other little mods, but no motor mods.
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Old Apr 14, 2007 | 07:38 AM
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Originally Posted by Pete K
I thought they made 240 hp and 330 at the flywheel stock?
Sounds like gm underrated the power, or the dyno may not have been accurate.
1988 was 245/340 at the crank I believe Pete. When mine was stock/stock she made 212rwhp/321rwtq if my memory is correct. Just a tad underrated in the TQ dept.
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Old Apr 14, 2007 | 07:39 AM
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Originally Posted by 88BlackZ-51
Say what? I made 240rwhp/330rwtq at the wheels with my stock L-98 engine. The valve covers have never been off the car. There are other little mods, but no motor mods.
Those are exceptional numbers. To make the same numbers at the wheel that they are said to make the flywheel is exceptional.
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Old Apr 14, 2007 | 07:47 AM
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Originally Posted by Pete K
I thought they made 240 hp and 330 at the flywheel stock?
Sounds like gm underrated the power, or the dyno may not have been accurate.
DITTO. Most of the L98 autos we see are lucky to crack 200. I can post a few graphs if need be.
As a side note, we do quite a few Imp SSs. They put down 230 HP roughly, untouched. Some not even that.
Anyone with a bone stock L98 auto making 240 at the wheels ought to be questioning the results. Those numbers are optimistic to say the least.
If you look at the graph, the HP peaks at 3900. The increase in cubes shows the intakes restriction even more. Again, same thing we see from stroker L98s with untouched intakes. Peak is usually 4200 or so. This one a little sooner. Maybe cause the cam is pretty mild.

Last edited by edcmat-l1; Apr 14, 2007 at 07:55 AM.
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Old Apr 14, 2007 | 07:52 AM
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Originally Posted by 88BlackZ-51
Say what? I made 240rwhp/330rwtq at the wheels with my stock L-98 engine. The valve covers have never been off the car. There are other little mods, but no motor mods.
details details details...

this leaves ALOT of wiggle room...
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Old Apr 14, 2007 | 07:59 AM
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Originally Posted by Fubar569
details details details...

this leaves ALOT of wiggle room...
What you talking about Willis. Did you read my other post below it?
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Old Apr 14, 2007 | 08:00 AM
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Originally Posted by edcmat-l1
DITTO. Most of the L98 autos we see are lucky to crack 200. I can post a few graphs if need be.
As a side note, we do quite a few Imp SSs. They put down 230 HP roughly, untouched. Some not even that.
Anyone with a bone stock L98 auto making 240 at the wheels ought to be questioning the results. Those numbers are optimistic to say the least.
If you look at the graph, the HP peaks at 3900. The increase in cubes shows the intakes restriction even more. Again, same thing we see from stroker L98s with untouched intakes. Peak is usually 4200 or so. This one a little sooner. Maybe cause the cam is pretty mild.
Read the thread. Don't get bent out of shape guys. It is, what it is. L-98's with the stock TPI's just dont make great power, plan and simple.
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Old Apr 14, 2007 | 08:08 AM
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Originally Posted by edcmat-l1
DITTO. Most of the L98 autos we see are lucky to crack 200. I can post a few graphs if need be.
As a side note, we do quite a few Imp SSs. They put down 230 HP roughly, untouched. Some not even that.
Anyone with a bone stock L98 auto making 240 at the wheels ought to be questioning the results. Those numbers are optimistic to say the least.
If you look at the graph, the HP peaks at 3900. The increase in cubes shows the intakes restriction even more. Again, same thing we see from stroker L98s with untouched intakes. Peak is usually 4200 or so. This one a little sooner. Maybe cause the cam is pretty mild.
I have seen my fair share of stock L-98 motor's on the dyno as well. Your right most auto's see around the 200rwhp mark.
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Old Apr 14, 2007 | 08:16 AM
  #34  
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Originally Posted by 88BlackZ-51
Read the thread. Don't get bent out of shape guys. It is, what it is. L-98's with the stock TPI's just dont make great power, plan and simple.
So what intake are you using?
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Old Apr 14, 2007 | 08:21 AM
  #35  
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Originally Posted by 88BlackZ-51
I have seen my fair share of stock L-98 motor's on the dyno as well. Your right most auto's see around the 200rwhp mark.
So picking up 60rwhp/40rwtq with 33 extra ci, a teeny cam and headers is bad? I'm sure that a good intake would put me over 300rwhp, so I'm not concerned that something is "wrong" with my engine... That's why I started another thread about intakes.
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Old Apr 14, 2007 | 08:51 AM
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Originally Posted by 88BlackZ-51
Read the thread. Don't get bent out of shape guys. It is, what it is. L-98's with the stock TPI's just dont make great power, plan and simple.
Sorry if it sounded like I was getting bent. Just sayin the same. It is what it is.
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Old Apr 14, 2007 | 09:26 AM
  #37  
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Originally Posted by edcmat-l1

If you look at the graph, the HP peaks at 3900.
I dont know what the hey I was lookin at.
Originally Posted by edcmat-l1
Peak is usually 4200 or so.
And thats right where this one is.
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Old Apr 14, 2007 | 09:51 AM
  #38  
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Originally Posted by Pete K
I thought they made 240 hp and 330 at the flywheel stock?
Sounds like gm underrated the power, or the dyno may not have been accurate.
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Old Apr 14, 2007 | 10:25 AM
  #39  
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Originally Posted by Pete K
Those are exceptional numbers. To make the same numbers at the wheel that they are said to make the flywheel is exceptional.
He has longtube headers, free mods and a catback thus the higher numbers.

Stock with nothing except the frisbee delete and a seeping headgasket the old 89 made anywhere from 224 to 232 hp and 321 to 332 lbs tq depending on engine temperature.

Heat soak kills these things
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