Boost possible with 10.7:1?
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From: Roscoe, IL
Car: 1991 Trans Am
Engine: LQ4
Transmission: T-56
Axle/Gears: 3.70
Boost possible with 10.7:1?
On my 383, Lunati and JE bottom end, rated to 900 hp and 8k RPM, AFR 210s ported to the moon and back, running on megasquirt. I want to go TT, what size turbos would I need? I can get 110 all over around here, but could I turn the boost down and run 93? it was intended to be N/A and 93 with no probs. wanted 500 rwhp. maybe its just a pipe dream and i should stick to my original plans
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From: Woodland, CA
Car: '02 Z06
Engine: L33 5.7
Transmission: T56
Axle/Gears: Stock IRS
I just recently went through this on my 10.7:1 cr engine, I have found its not really going to be benificial at all. I in fact tore down my engine and am redoing it for 8.7:1 which is a pretty common low compression number I have found for 383's
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Joined: Apr 2006
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From: Fresno, CA
Car: 99 Ford Ranger
Engine: 3.0 Flex Fuel V6
Transmission: The kind you have to change by hand
If youre running a high CR, then boost will be very low. I would say roughly 8-10psi on a T3 unit. If you really want boost, get cams that are designed for it, and a lower CR if you really want the power.
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From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
bust out the nitrous and skip the boost for when you build an o-ringed block for big numbers and low compression
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Joined: Apr 2002
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From: Roscoe, IL
Car: 1991 Trans Am
Engine: LQ4
Transmission: T-56
Axle/Gears: 3.70
thanks for the input guys. ill guess ill just spray the light house at it until it goes 
then ill build a TT 377
then ill build a TT 377 
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From: miami, florida
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From: garage
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Good choice on using the N2O instead. In order to use the 10.7:1 CR you would have to throw a giant cam in it to leak down the cyls for normal street use but then the cam would be too much for the street. Race gas and a huge intercooler would also be needed.
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From: currently Jacksonville NC
Car: 91 z28
Engine: 383 sbc, 88mm turbo a2w IC, CSU 750
Transmission: th-400 PTC 4000 stall
Axle/Gears: ford 9" 3.55 gear
probably meth injection too....
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From: Maui, Hawaii
Car: 1984 Trans Am
Engine: broken 385sbc
Transmission: G-Force rebuilt T-5
Axle/Gears: Currie 9" Ford 4.30:1
if your heads weren't so AFR-ish and "ported to the moon and back", i would say get some heads with 76cc combustion chambers and some MLS head gaskets.. then boost it up to about 12-15lbs intercooled.. i assume you have the heads with 66cc combustion chambers.. so a 76cc will bring you down to about 9.6-9.7:1.. but thats just a thought.. i would stick with the AFR's and nitrous the crap outta it.. just tune well and hope for the best..
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