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twin turbo l33 in a 85 monte carlo ss advice

Old 09-17-2013, 12:56 PM
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Default twin turbo l33 in a 85 monte carlo ss advice

Hey guys, I'd like to pick your brains about this build. Here's what I have so far..
1985 Monte SS about 3400 lbs
two Holset Hy35's ( t-3 footprint about 64 pounds per min maxed)
l33 alm blk, stock rotating assembly, 243 heads
I'm going to use the truck intake/ tb
E85 fuel
Megasquirt 2
Th400 (reverse manual-t brake)
ford 8.8 31 spline axles, carrier

The car will be a street car with weekend strip duty. Im undecided on the cam, converter and gears. I'm wanting a streetable 700 rearwheel hp car.
I'm thinking between a 3.08 and 3.55 gear, 3600 stall and maybe a tsp 224r cam. Any ideas, suggestions?

Oh, I don't care about cam surge or a lumpy idle.
Old 09-17-2013, 05:06 PM
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Id go with 3.73 gears
Old 09-17-2013, 08:09 PM
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3.73's? For a twin Turbo application? I was thinking 3.55's are a lil steep.
Old 09-17-2013, 08:18 PM
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Sorry your right I was thinking naturally aspirated. My fault
Old 09-17-2013, 09:52 PM
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Id go 3.25's personally
Old 09-18-2013, 08:38 AM
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Lol no harm.
Yeah, ill most likely use those or 3.08's
Old 09-18-2013, 08:53 AM
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Lol no harm.
Yeah, ill most likely use those or 3.08's
Old 09-18-2013, 09:12 AM
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I don't have any turbo experience but it sounds like it'll be a fun ride. Good luck with build
Old 09-18-2013, 03:32 PM
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Thank you sir.
Old 09-18-2013, 04:25 PM
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I'd do HX35's not HY's. The little 9cm2 T3 housing will choke like crazy with 163ci each. The HX35 has the exact same 56mm compressor wheel with a larger 12cm2 T4 turbine housing and a slightly larger turbine wheel. Twin HX40's would be the **** but they are harder to come by.
Old 09-18-2013, 08:02 PM
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Originally Posted by S13LSx
I'd do HX35's not HY's. The little 9cm2 T3 housing will choke like crazy with 163ci each. The HX35 has the exact same 56mm compressor wheel with a larger 12cm2 T4 turbine housing and a slightly larger turbine wheel. Twin HX40's would be the **** but they are harder to come by.
I'm gonna give them a try. Lots of DSM guys run them fine and have no back pressure problems. The 4g63 is only 122 cubes but, a lot of guys rev to 8k. I myself had one on a 4g63 logging 64 lb/min.
I'm going to limit myself to a 7k redline. So, Im curious as to how they will perform. If they choke , x35's and 40's are common here. I live in the middle of a performance diesel mecca.


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