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Highest rwhp NA LT1 427 - 627rwhp

Old 06-05-2017, 12:57 PM
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Default Highest rwhp NA LT1 427 - 627rwhp

We just finished up tuning this 2017 Grand Sport with Katech Street Attack 427 LT1 dry sump engine and it made the highest horsepower of any LT1 natually aspirated car to date. Look for a picture thread on the car when it's finished as well as a professionally produced video we're working on.



Photo by Andy Perry

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Old 06-05-2017, 01:53 PM
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Old 06-05-2017, 03:56 PM
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village idiot
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Man, that's a lot of work to make less power than an LT4

(Not knocking it- sad face because for people who do track days, supercharging isnt a good option).
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Old 06-05-2017, 05:54 PM
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Or you could look at it as a new baseline for supercharging.
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Old 06-05-2017, 06:49 PM
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What did it cost to reach those numbers?
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Old 06-05-2017, 06:57 PM
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Originally Posted by village idiot View Post
Man, that's a lot of work to make less power than an LT4

(Not knocking it- sad face because for people who do track days, supercharging isnt a good option).
this appears to be to the wheels which mean's it's making a lot more than a stock c7z.

I will say it looks like the throttle body started to close up on you on the hit based on the dip in the tq there.
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Old 06-06-2017, 01:02 AM
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If that number is to the wheels, that's awesome! A crazy powerful NA motor! Good work guys.
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Old 06-06-2017, 03:15 AM
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Originally Posted by [email protected] View Post
this appears to be to the wheels which mean's it's making a lot more than a stock c7z.

I will say it looks like the throttle body started to close up on you on the hit based on the dip in the tq there.
Doh, didn't think of that for some reason! I saw it outside the car and thought chassis dyno. Good catch!

If it's a manual, that's about 100hp on the LT4. Even more if it's an auto.
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Old 06-06-2017, 03:27 AM
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It clearly states rwhp twice in the title....and the dyno chart is on a Dynojet dyno which is a chasis dyno so.... Yeah its making 100 more then an LT4 at the wheels...Pretty killer power.

I'd love to see pics of the engine internals and the heads...

627 rwhp and a couple hundred less pounds then a Z06......car is gonna run hard.
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Old 06-06-2017, 09:23 AM
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Originally Posted by Snowwolfe View Post
What did it cost to reach those numbers?
Engine pricing can be found here:
http://katechengines.com/performance...gine-packages/
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Old 06-06-2017, 09:24 AM
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Originally Posted by ajrothm View Post
It clearly states rwhp twice in the title....and the dyno chart is on a Dynojet dyno which is a chasis dyno so.... Yeah its making 100 more then an LT4 at the wheels...Pretty killer power.

I'd love to see pics of the engine internals and the heads...

627 rwhp and a couple hundred less pounds then a Z06......car is gonna run hard.
See here: http://www.superchevy.com/how-to/eng...d-performance/
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Old 06-06-2017, 11:34 AM
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$20k plus? And no warranty if you use it on the track? To rich and risky for me.
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Old 06-06-2017, 12:47 PM
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That's crazy power from the LT1 .. Very impressive!
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Old 06-06-2017, 12:50 PM
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Originally Posted by BooSSted View Post
That's crazy power from the LT1 .. Very impressive!
Thanks. We have even crazier stuff in the works.
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Old 06-06-2017, 01:41 PM
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Originally Posted by Snowwolfe View Post
$20k plus? And no warranty if you use it on the track? To rich and risky for me.
Get this motor into a Grandsport and you have one of the most Track capable cars on the planet outside of a full race car. And will look stock. Yes it's expensive, but that's one hell of a motor.
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Old 06-06-2017, 03:07 PM
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Originally Posted by Snowwolfe View Post
$20k plus? And no warranty if you use it on the track? To rich and risky for me.
I don't think people are buying this for daily driving.

For those of us that road race, NA is the only option right now. It's also about the price difference between a GS and a Z06.
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Old 06-06-2017, 05:33 PM
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$65k Gran Sport + $20k NA motor = $85k worth of fun .... same starting price of a Z
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Old 06-06-2017, 05:43 PM
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Do not doubt it is worth it to some. But the $20K did not include swapping the engines. Plus it cost more without a suitable core exchange. Not trying to knock the product. I just didnt have any clue a build like this cost so much.
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Old 06-06-2017, 09:09 PM
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Originally Posted by blue_bomber697 View Post
Get this motor into a Grandsport and you have one of the most Track capable cars on the planet outside of a full race car. And will look stock. Yes it's expensive, but that's one hell of a motor.
It'll be no easier to cool this 700hp+ NA motor in a GS than it is to cool the 650hp LT4 in the Z.

It's not like there's something "wrong" with the LT4, it's the cooling system and frontal inlets, which are the same on the GS.

I think it's amazing they got this level of HP out of the LT1, and similarly amazing that it's still a couple of hundred pound feet of torque short of the full-warranty LT4 down low.

Pick your poison... First world problems, baby.
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Old 06-07-2017, 09:15 AM
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Originally Posted by DAVE396LT1 View Post
It'll be no easier to cool this 700hp+ NA motor in a GS than it is to cool the 650hp LT4 in the Z.

It's not like there's something "wrong" with the LT4, it's the cooling system and frontal inlets, which are the same on the GS.

I think it's amazing they got this level of HP out of the LT1, and similarly amazing that it's still a couple of hundred pound feet of torque short of the full-warranty LT4 down low.

Pick your poison... First world problems, baby.

Here is a video of Andy Pilgrim driving it around M1 Concourse on a hot day in July.



Here is a video of Andy Pilgrim driving it around the NCM track.
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