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

L98 power

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Old May 9, 2011 | 02:35 PM
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Default L98 power

so as i understand it, TPI is well junk for the most part when it comes to flowing air...


so what does a guy have to do that wants to get over 300whp on a naturally aspirated l98? can you do away with the tpi and go another route?
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Old May 9, 2011 | 03:06 PM
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A mini-ram will get you there
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Old May 9, 2011 | 03:12 PM
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what does that do delete the plentum and stuff?

from what ive seen looks like heads and cam wont even do much for me becuase the restriction is ahead of that.



basically im looking for as close to 350whp as i can get as cheaply and reliably as possible


also, what is the bottom end capable of holding?

Last edited by RedBowTies88; May 9, 2011 at 03:22 PM.
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Old May 9, 2011 | 03:31 PM
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Originally Posted by RedBowTies88
what does that do delete the plentum and stuff?

basically im looking for as close to 350whp as i can get as cheaply and reliably as possible
IIRC, it becomes the plenum and manifold so that is your restriction removed.

Now you probably will need heads, cam and a tune
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Old May 9, 2011 | 03:35 PM
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gotcha, are these heads worth having ported or are they crappy?

anyone know what kinda power stock heads/cam will do with that intake setup?

also...what are stock fresh clutches good for?

thanks
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Old May 9, 2011 | 03:44 PM
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Originally Posted by RedBowTies88
gotcha, are these heads worth having ported or are they crappy?
Lingenfelter did port the Corvette D-Port heads and made about 430HP at the crank IIRC but that is with the SuperRam intake and a different cam. So yes, you can port the heads or get better heads out of the box from say AFR.
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Old May 9, 2011 | 03:48 PM
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ok thanks... thats not too bad. wonder if they changed the springs or anything...


what about the holding capacity of the stock bottom end and factory clutch?
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Old May 9, 2011 | 03:51 PM
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Originally Posted by RedBowTies88
ok thanks... thats not too bad. wonder if they changed the springs or anything...


what about the holding capacity of the stock bottom end and factory clutch?
They ported the heads, changed all the hardware on the thing. Valves, springs, etc, etc.

I made a mistake. I forgot the 430 crank HP was with a 383. Not sure what the bottom will take but I think that is a little much if the block is tired.
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Old May 10, 2011 | 09:19 AM
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gotcha...well mines fairly fresh, only 45k
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Old May 10, 2011 | 09:24 AM
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To give you an idea, I am pushing 410 at the wheels. 350 isn't far behind me.
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Old May 10, 2011 | 09:29 AM
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I've got about the highest power for a N/A TPI here I think, 326 rwhp and 400 lb/ft.

You can only go so far with the TPI...here is my build http://temp.corvetteforum.net/c4/joe90/index8.shtml

Lots of magic to make all the TPI stuff work, but the torque is enormous. I road race and AutoX and have mountains of torque out of the corners. If you plan to drag race, a MiniRam is your best bet.
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Old May 10, 2011 | 09:29 AM
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gotcha Aklim, do you have an aftermarket hood so the stealth ram will clear?


are there any thoughts regarding stealth ram v.s. miniram? besides the side difference? seems like the stealth is a bit cheaper
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Old May 10, 2011 | 09:35 AM
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Originally Posted by 1991Z07
I've got about the highest power for a N/A TPI here I think, 326 rwhp and 400 lb/ft.

You can only go so far with the TPI...here is my build http://temp.corvetteforum.net/c4/joe90/index8.shtml

Lots of magic to make all the TPI stuff work, but the torque is enormous. I road race and AutoX and have mountains of torque out of the corners. If you plan to drag race, a MiniRam is your best bet.

nice site man, im a little surprised you pulled off a 12.6 on street tires wth 325whp but thats awesome never the less.


what are you using for a throttle body?
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Old May 10, 2011 | 09:47 AM
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Originally Posted by 1991Z07
I've got about the highest power for a N/A TPI here I think, 326 rwhp and 400 lb/ft.

You can only go so far with the TPI...here is my build http://temp.corvetteforum.net/c4/joe90/index8.shtml

Lots of magic to make all the TPI stuff work, but the torque is enormous. I road race and AutoX and have mountains of torque out of the corners. If you plan to drag race, a MiniRam is your best bet.
That is pretty good for a 355. It took me a 383 to achieve 410 rwhp
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Old May 10, 2011 | 09:48 AM
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Originally Posted by RedBowTies88
gotcha Aklim, do you have an aftermarket hood so the stealth ram will clear?


are there any thoughts regarding stealth ram v.s. miniram? besides the side difference? seems like the stealth is a bit cheaper
No, cut a hole and stick a Greenwood Hood Scoop.

UMC makes a stealth ram that will clear the hood. Not sure exactly what the difference is between the original and modified.
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Old May 10, 2011 | 10:05 AM
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gotcha, probably would be better to just go with the miniram then since the cost of having the hood repainted would be more then the price difference..
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Old May 10, 2011 | 10:12 AM
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Originally Posted by RedBowTies88
gotcha, probably would be better to just go with the miniram then since the cost of having the hood repainted would be more then the price difference..
I didn't have the hood repainted. I had the scoop painted to match
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Old May 10, 2011 | 10:16 AM
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they didn't have to blend it to get it to look right? only because the paint on my car is in pretty good shape ide kick myself if i let it start to look any worse.


that holley power pack with the stealt ram/rails/TB and all that jazz is going for 2k on summit...sound reasonable? can you daily drive a 58mm TB? i've heard its not ideal
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Old May 10, 2011 | 12:21 PM
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Originally Posted by RedBowTies88
nice site man, im a little surprised you pulled off a 12.6 on street tires wth 325whp but thats awesome never the less.


what are you using for a throttle body?
Ported 58 MM...

Last edited by 1991Z07; May 10, 2011 at 12:27 PM.
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Old May 10, 2011 | 12:22 PM
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Originally Posted by RedBowTies88
they didn't have to blend it to get it to look right? only because the paint on my car is in pretty good shape ide kick myself if i let it start to look any worse.


that holley power pack with the stealt ram/rails/TB and all that jazz is going for 2k on summit...sound reasonable? can you daily drive a 58mm TB? i've heard its not ideal
If your bodyshop can't do it, there might be some other issue. Mine didn't blend anything.

Sure. You just cannot simply slap on a 58mm TB and expect it do do anything. You need the supporting stuff like the plenum and manifold, etc, etc.
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