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Turbo Question

How to make it go fast

Moderators: Greenleaf, KTA, BC847, Richie O

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Postby KTA » Sat Mar 17, 2007 12:01 pm

The big turbo needs to be big enough to supply enough air to build boost against the small turbo or you dont get any compounding effect and therfore lose the effeciency gains of running series twins. If you run 2 turbos of almost the same size you wont get a big boost number because of air flow, maybe because of alot of drive pressure, but not from performance.
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Postby Begle1 » Sat Mar 17, 2007 2:41 pm

What about the all the guys running dual S-300's? All they're getting is increased pressure?
1990 D-250 Regular Cab: Tweaked injection pump, built transmission, a cataclysmic charlie foxtrot of electronics, the most intense street-ran water injection system in the country, and some more unique stuff.
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Postby gman07 » Sat Mar 17, 2007 4:30 pm

I think most twins with two S300s (as in the BD twins) have two vastly different S300s. The S300 has many wheel and housing options; I think the BD twins use a small one (probably 57mm compressor inducer) on top and a custom-engineered S300 with bigger wheels on the bottom.
1992.5 W250 pump tweaked, straight pipe, gauges, 3200 Gov. spring, AFC lever partially ground, timed at 1/8", Fuel pin ground, BHAF, HTT Stage IV H1C/E 60/12wg (ported), Transgo shift kit, KDP clothes-hangered, 202,000 miles - 36psi, 1250°
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Postby 92 D/UNIT » Sat Mar 17, 2007 4:53 pm

gman07 wrote:I think most twins with two S300s (as in the BD twins) have two vastly different S300s. The S300 has many wheel and housing options; I think the BD twins use a small one (probably 57mm compressor inducer) on top and a custom-engineered S300 with bigger wheels on the bottom.


but how much bigger? i thought they ran a s400 on the bottom.
i would like to have 425-450 hp that i could do just about anything without having to worry so much about egts, so i thought about a hx50 on the bottom, is the hx 50 a viable candidate for a bottom turbo?
Brian 92 D 250 250K, A518, pump mods, BHAF, 4X15s, 4" turbo back dual exh, 3200 spring, HTB2 62/12.

SOLD 92 w250 ex cab, 5 spd, 3.54, 320,000, WH1E 14, Fuel pin, pods,shortened 4200 gs, Bhaf, 4" turbo back
388/886
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Postby KTA » Mon Mar 19, 2007 5:57 am

The bd twins use a 57mm and a 71mm wheeled s300. They are intended for limited compounding that is why they are designed to only run about 60psi max. The Hx50 is also most likely a 71mm so that would be a good choice for the power level you are wanting.
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Postby 92 D/UNIT » Mon Mar 19, 2007 6:48 am

Thanks for the info gentlemen :)
Brian 92 D 250 250K, A518, pump mods, BHAF, 4X15s, 4" turbo back dual exh, 3200 spring, HTB2 62/12.

SOLD 92 w250 ex cab, 5 spd, 3.54, 320,000, WH1E 14, Fuel pin, pods,shortened 4200 gs, Bhaf, 4" turbo back
388/886
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Postby TOMTOM » Fri Mar 30, 2007 9:16 am

What are you using for a top turbo?
TOMMY
93 CLUB CAB LE SHORT BED 209,000 MILES AUTO/OD 3.54 GEARS 4" TURBO BACK EX NO MUFFLER P7100 PUMP MODS B/D INJECTORS 13.55@99 MPH 440HP 967TQ ON #2 ONLY. PSD INTERCOOLER,BD SUPER B TURBO)47RE FULL MAN SUNCOAST TRIPLE DISC
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Postby 92 D/UNIT » Fri Mar 30, 2007 5:45 pm

i was either going to use a hx35 or a wh1e.
Brian 92 D 250 250K, A518, pump mods, BHAF, 4X15s, 4" turbo back dual exh, 3200 spring, HTB2 62/12.

SOLD 92 w250 ex cab, 5 spd, 3.54, 320,000, WH1E 14, Fuel pin, pods,shortened 4200 gs, Bhaf, 4" turbo back
388/886
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Postby TOMTOM » Sun May 20, 2007 3:53 pm

What's the latest on this project?
Whats up BRIAN?
TOMMY
93 CLUB CAB LE SHORT BED 209,000 MILES AUTO/OD 3.54 GEARS 4" TURBO BACK EX NO MUFFLER P7100 PUMP MODS B/D INJECTORS 13.55@99 MPH 440HP 967TQ ON #2 ONLY. PSD INTERCOOLER,BD SUPER B TURBO)47RE FULL MAN SUNCOAST TRIPLE DISC
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