So heres the deal, I tell you the intake and turbo, you tell me what motor and heads.
07-28-2010, 02:41 PM
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So heres the deal, I tell you the intake and turbo, you tell me what motor and heads. Intake: Super Victor (or GMPP for rectangle port heads if needed)
Turbo: T6 80MM, GT4780 / PT4780 or similar (80mm is the limit)
Transmission: RMVB TH400 or RMVB 4L80 (no electronics in the 4L)
Goal: 3250lb race weight, high 8's in the desert with just the 80mm.
I had originally planned on a 415ci LS3 with either AFR 245's or Trickflow 235's, however I am reading now that I should be considering other heads and smaller displacement to take advantage of the small turbo I am stuck with.
So, I ask you tech...
What ci motor would you build, and what heads would you put on it knowing the above, and mostly WHY do you say that. I am a technical person so I like to know the ins and outs of why something does or does not work.
Thanks!
Turbo: T6 80MM, GT4780 / PT4780 or similar (80mm is the limit)
Transmission: RMVB TH400 or RMVB 4L80 (no electronics in the 4L)
Goal: 3250lb race weight, high 8's in the desert with just the 80mm.
I had originally planned on a 415ci LS3 with either AFR 245's or Trickflow 235's, however I am reading now that I should be considering other heads and smaller displacement to take advantage of the small turbo I am stuck with.
So, I ask you tech...
What ci motor would you build, and what heads would you put on it knowing the above, and mostly WHY do you say that. I am a technical person so I like to know the ins and outs of why something does or does not work.
Thanks!
Last edited by ArthurJGuy; 07-28-2010 at 02:56 PM.
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07-28-2010, 09:12 PM
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0.75
Small motor and $$ heads or big motor and cheap heads.
I think the 402 and $$ heads will out run what an 80mm can push
Guys are doing 9.3ish on 370's with AFR 225's and PT88.
Big motor may also need a bigger turbine than your listed turbo. You'd need to ask Jose on that one.
There's a guy on TTF that's going 9.40 in 4400 lb truck & 383sbc with only cal tracs for suspension mod and AFR 195's.
Best chance with the 80mm is a 370 and mid size PI cathedral head.
It should have no problem running off the map w/ some rpm.
The smaller setup should get the compressor up in the higher PR section of the map for max compressor capacity.
But it's easier to change heads later than a crank so the 4xx motor has is pros too.
It's kind've a balance with CID and boost w/the 4 bolt head.
Small motor and $$ heads or big motor and cheap heads.
I think the 402 and $$ heads will out run what an 80mm can push
Guys are doing 9.3ish on 370's with AFR 225's and PT88.
Big motor may also need a bigger turbine than your listed turbo. You'd need to ask Jose on that one.
There's a guy on TTF that's going 9.40 in 4400 lb truck & 383sbc with only cal tracs for suspension mod and AFR 195's.
Best chance with the 80mm is a 370 and mid size PI cathedral head.
It should have no problem running off the map w/ some rpm.
The smaller setup should get the compressor up in the higher PR section of the map for max compressor capacity.
But it's easier to change heads later than a crank so the 4xx motor has is pros too.
It's kind've a balance with CID and boost w/the 4 bolt head.
Last edited by TurboS10; 07-28-2010 at 11:09 PM.
07-28-2010, 11:23 PM
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0.75
Small motor and $$ heads or big motor and cheap heads.
I think the 402 and $$ heads will out run what an 80mm can push
Guys are doing 9.3ish on 370's with AFR 225's and PT88.
Big motor may also need a bigger turbine than your listed turbo. You'd need to ask Jose on that one.
There's a guy on TTF that's going 9.40 in 4400 lb truck & 383sbc with only cal tracs for suspension mod and AFR 195's.
Best chance with the 80mm is a 370 and mid size PI cathedral head.
It should have no problem running off the map w/ some rpm.
The smaller setup should get the compressor up in the higher PR section of the map for max compressor capacity.
But it's easier to change heads later than a crank so the 4xx motor has is pros too.
It's kind've a balance with CID and boost w/the 4 bolt head.
Small motor and $$ heads or big motor and cheap heads.
I think the 402 and $$ heads will out run what an 80mm can push
Guys are doing 9.3ish on 370's with AFR 225's and PT88.
Big motor may also need a bigger turbine than your listed turbo. You'd need to ask Jose on that one.
There's a guy on TTF that's going 9.40 in 4400 lb truck & 383sbc with only cal tracs for suspension mod and AFR 195's.
Best chance with the 80mm is a 370 and mid size PI cathedral head.
It should have no problem running off the map w/ some rpm.
The smaller setup should get the compressor up in the higher PR section of the map for max compressor capacity.
But it's easier to change heads later than a crank so the 4xx motor has is pros too.
It's kind've a balance with CID and boost w/the 4 bolt head.
Personally I went the route of saving money on the heads, and putting it in the turbo, the ultimate determinate of how much power its going ot make.
4 bolt head vs small/big engine, boost doesnt lift heads does it? Cylinder pressure does, low or high boost 1000 hp is a certain cylinder pressure Id think. Tuning window and spooling window will be smaller with smaller engine yes. You run out of turbo with a 80mm on a 370 no problem, mines choked I know
07-28-2010, 11:48 PM
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9.40 w/80mm 16-17psi at 4400lbs nothing done but cal tracs......needs valvetrain or bigger turbine, not sure which and pretty expensive fix for a 9sec street truck that tows a boat. Dropping 1000lbs off that combo would be in the 8's easy.....
9.30 is with an T4 based 88 370 street car. -98Z28Cobrakiller
OP is in the desert so running off the map will add even more heat to the air.
More guys lifting at 20+ than 15.....but an 80 will flow more air at 20+ than 15.
Tune lifts more heads than boost and you know it.
Based on your comments and agreement on the 370
The 370 with as cast 220's and a 234/238 cam should about max an 80mm out.
But I'd like to see someone doing 8's with as cast TFS 220's first.
If I had the coin, I'd get the PI heads no matter what.....still might, but I have reservations on
spending that much on heads and keeping a stock crank.
9.30 is with an T4 based 88 370 street car. -98Z28Cobrakiller
OP is in the desert so running off the map will add even more heat to the air.
More guys lifting at 20+ than 15.....but an 80 will flow more air at 20+ than 15.
Tune lifts more heads than boost and you know it.
Based on your comments and agreement on the 370
The 370 with as cast 220's and a 234/238 cam should about max an 80mm out.
But I'd like to see someone doing 8's with as cast TFS 220's first.
If I had the coin, I'd get the PI heads no matter what.....still might, but I have reservations on
spending that much on heads and keeping a stock crank.
Last edited by TurboS10; 07-29-2010 at 12:01 AM.
