Supercharged 6.0...700HP

[Hart_Rod]

Ok, now that I have your attention, , I need help with new motor tranny combo for my 68.

What I want: 700HP, streetable, reliable and decent fuel economy, .

Building blocks: LQ4 motor with L92 heads, Doug Thorley 1 7/8th headers, TVS1900 Magnacharger, Aeromotive 1000 fuel pump and pressure regulator, 4L80E

Suggestion on cam and springs? Stall? Throttle body?
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[kpeztruck]

Rob, I believe Hot Rod magazine has done an article on a supercharged LS engine that made that on pump gas. If I am not mistaken, they had an inter cooled Kenne Bell supercharger, but the article should be a good starting point.
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[BossHogg69]

Chevy High Performance did one with a centrifugal sc that made over 700, but I think it was a 6.2L. It was a couple months back.

[69trk]

Texas speed will hook you up on just about any questions and parts that you have or need!!!!

[Hart_Rod]

Originally Posted by kpeztruck

Rob, I believe Hot Rod magazine has done an article on a supercharged LS engine that made that on pump gas. If I am not mistaken, they had an inter cooled Kenne Bell supercharger, but the article should be a good starting point.
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Good info, thanks!

Originally Posted by BossHogg69

Chevy High Performance did one with a centrifugal sc that made over 700, but I think it was a 6.2L. It was a couple months back.

I've read a few articles on the centrifugals, and some of the big ones are making crazy HP (1500+ !!!!). I'm going with the Maggie because it's quieter and like the setup for the LS motors.

Originally Posted by 69trk

Texas speed will hook you up on just about any questions and parts that you have or need!!!!

Thanks, do they have a website? (Edit: I found their site. Have you talked to them much?)

[68jewel]

Originally Posted by 69trk

Texas speed will hook you up on just about any questions and parts that you have or need!!!!

Originally Posted by Hart_Rod

Thanks, do they have a website? (Edit: I found their site. Have you talked to them much?)

Rob, I bought both of my LS's from Texas Speed. I highly recommend them. Great customer service.

[Super73]

Texas Speed is not a perfect shop.

Let me just say that my 418 short block they built for me had some problems. They were told from the beginning that it was a n20 motor, set the pistons in the hole with proper clearances and do not file the rings. Pistons were set with 3.5 thou and rings were filed 18/22.. They tried to tell me that is how they set up their motors seeing 300+ n20 hits. Funny, the piston mfg they used had different thoughts. Pistons needed to be 4.5 thou and rings 28/30. They eventually made it right by paying the bill at a local machine shop to fix the bores, I opened the ring gap up.

They also don't give you all the details regarding high spring pressures and stock rockers, what happens to valve tips and side loading on guides. They will sell you their .675 lift spring all day but not admit to the valve tip erosion nor the heavy guide wear. When asked about that, they might try to sell you a roller rocker which requires more spring to control the added weight over the valve. But they seem to negate the need for a better than 5/16 .080 pushrods. High spring pressure will cause push rod deflection. Oh the vicious valve control circle.

I could go on with other things, but I will stop there. I will just say, they are not forth coming with real technical info when you ask. For cookie cutter info, generic question sure, but not much more than that.
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[68jewel]

Originally Posted by Super73

Texas Speed is not a perfect shop.

They eventually made it right by paying the bill at a local machine shop to fix the bores, I opened the ring gap up.

Sorry to hear that. I can only go on personal experience and the experience of a few of my buddies. But, there isn't a such thing as a perfect shop and at least they made it right by paying for it. Some shops wouldn't have even done that much and would've left you high and dry. So, they can't be that bad, even though they messed up your motor.

[BossHogg69]

[QUOTE=Hart_Rod;5698287]
I've read a few articles on the centrifugals, and some of the big ones are making crazy HP (1500+ !!!!). I'm going with the Maggie because it's quieter and like the setup for the LS motors.QUOTE]

I know you have a screw-type, but I just figured you might look and see what cam/springs they used, or just gather some general info to get 700 supercharged hp.

[Hart_Rod]

Originally Posted by 68jewel

Rob, I bought both of my LS's from Texas Speed. I highly recommend them. Great customer service.

Thanks for the info!

Originally Posted by Super73

Texas Speed is not a perfect shop.

Let me just say that my 418 short block they built for me had some problems. They were told from the beginning that it was a n20 motor, set the pistons in the hole with proper clearances and do not file the rings. Pistons were set with 3.5 thou and rings were filed 18/22.. They tried to tell me that is how they set up their motors seeing 300+ n20 hits. Funny, the piston mfg they used had different thoughts. Pistons needed to be 4.5 thou and rings 28/30. They eventually made it right by paying the bill at a local machine shop to fix the bores, I opened the ring gap up.

They also don't give you all the details regarding high spring pressures and stock rockers, what happens to valve tips and side loading on guides. They will sell you their .675 lift spring all day but not admit to the valve tip erosion nor the heavy guide wear. When asked about that, they might try to sell you a roller rocker which requires more spring to control the added weight over the valve. But they seem to negate the need for a better than 5/16 .080 pushrods. High spring pressure will cause push rod deflection. Oh the vicious valve control circle.

I could go on with other things, but I will stop there. I will just say, they are not forth coming with real technical info when you ask. For cookie cutter info, generic question sure, but not much more than that.
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Sorry to hear you had a problem. I hope you got everything worked out. I've read a lot of your threads and look forward to hearing your suggestions on cam and converter size and spring suggestions. TIA.

Originally Posted by 68jewel

Sorry to hear that. I can only go on personal experience and the experience of a few of my buddies. But, there isn't a such thing as a perfect shop and at least they made it right by paying for it. Some shops wouldn't have even done that much and would've left you high and dry. So, they can't be that bad, even though they messed up your motor.

True Dat!

Originally Posted by BossHogg69

I know you have a screw-type, but I just figured you might look and see what cam/springs they used, or just gather some general info to get 700 supercharged hp.

I got you, I guess boost is boost now matter how it's created, .

Thanks again guys, keep it coming!!!!

[sourkraut]

Will be watching
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[truckmanloco]

Here ya go Rob

http://www.hotrod.com/techarticles/e...blown_alky_ls/

[BR3W CITY]

I had a decent experience with TSP, but that was just for a cam setup, not a built engine. From what I understand, PatG over @ls1tech still does some pretty sweet custom blower cams, and I think he has an off the shelf blower cam also. PRC dual springs haven't failed me, and I doubt you'd need more than that.

I assume your running DBC? Which bolt pattern is on the blower, the 4 bolt?

[raull]

hello rob , here is a link to the shop who is helping me with my 5.3 TT short block and heads ,
http://www.mesabalancing.info/Produc...it=Drag+Racing

i will contact him tomorrow and ask him for some suggestions on what you want to do , he has build several TT's and supercharged ls motors

[jmedero]

I'm glad your keeping it simple. I would hate to see things get complicated in that new shop of yours...... Lol
Let me know if you need me to come over... I can sweep really well and do beer runs. Lol
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[68 TT]

Originally Posted by Hart_Rod

Ok, now that I have your attention, , I need help with new motor tranny combo for my 68.

What I want: 700HP, streetable, reliable and decent fuel economy, .

Building blocks: LQ4 motor with L92 heads, Doug Thorley 1 7/8th headers, TVS1900 Magnacharger, Aeromotive 1000 fuel pump and pressure regulator, 4L80E

Suggestion on cam and springs? Stall? Throttle body?

You need to look at the LS9 cam specs from the Corvette ZR1 and see where Chevy is at to make 638hp with the supercharged 6.2 engine and the large L92 style intake ports. I don't remember how much boost they are using in stock form but if I remember right it was around 9psi.

A couple of turbo guys I know are making 600-650 to the rear wheels with stock cathedral port 5.3's running ~16 pounds of boost on pump gas. They are both running the same basic setup and are using the 2004 vintage Z06 Vette cam and the Patriot Gold valve spring package. Many runs down the drag strip with no issues.

This should give you some base line as to how much cam is needed to make the power you are looking for on pump gas. Base your boost level on the fuel you want to run and size the cam accordingly. Depending upon how much boost you want to run you may need a whole lot of cam.

With the right tune you can run quite a bit of boost on 93-octane pump gas. My old 87 GN ran 17 - 19 psi on the street with 93-octane fuel.

[Hart_Rod]

Ok, I finally picked up the powerplant I'm going to use: It's a 6.2/6L80E out of a 2013 Camaro SS with only 135 miles! Now, I've got to figure out if I want to delete the AFM/VVT because I plan on putting my Magnacharger TVS1900 blower on it......

[68Stepbed]

<---is slightly jealous. Check with Mast motorsports on wether or not to keep the VVT or not with the huffer.

[Hart_Rod]

Originally Posted by 68Stepbed

<---is slightly jealous. Check with Mast motorsports on wether or not to keep the VVT or not with the huffer.

, will do!