408 stroker with twins
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Teching In
Joined: Jan 2014
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408 stroker with twins Ok so I'm new to this site but I'm looking to build a 408 stroker out of a 6.0l with a mild cam and a little head work going to go with the carb instead of fuel injection and I am wanting to run a twin turbo blow through system. I am new to the turbo game and curious what size turbos would get me to 800 rwhp at low boost?? Turbo sizes and suggestions on turbos plz?!?
FormerVendor
Joined: Feb 2011
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A pair of T4 turbos with a 61mm compressor and 65mm turbine wheel with a .68 A/R turbine
housing will make 1000+ HP and spool lighting fast. With a mild cam you will make good power up to about 6000 rpm.
If you put enough cam in it to make power to 6800-7000 the same turbos with a .96A/R
will let it make better power a higher rpm.
housing will make 1000+ HP and spool lighting fast. With a mild cam you will make good power up to about 6000 rpm.
If you put enough cam in it to make power to 6800-7000 the same turbos with a .96A/R
will let it make better power a higher rpm.
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Seems a little on the small side for a 408, I have that same setup on my 6.0L
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I have twin 66mm with 65mm turbines and .68 A/R on my 408. It put down 910 rwhp around 18 psi. I'll try again with my bigger injectors and more boost. I do think the .68 A/R housings are limiting me a little up top though.
I set my 2-step at 4,200 rpm and leave with 6 psi on the boost controller. Lag is dependent on your stall converter, vehicle weight, and gear ratio along with turbo selection. With my 9½" PTC converter, 3,700 lbs, and 3.08 gears it flashes the rpm up quickly and lag is not an issue.
FormerVendor
Joined: Feb 2011
Posts: 547
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Now I say small in contrast to a pair of 78/68's or 78/75's. Ether one of those can make 1500+ HP. Look at the Nova in the video, 5.70's @ 122! on almost the exact turbo.
He has 66mm and I suggested 61's.
The 61's are good for over a 1000 HP easily. That's a lot of power to drive on the street.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
Of course the other thing is not all 66mm's are equal, or indeed any other diameter.
A Cheapo chinese 66mm, a basic branded cast 66mm, and fancy billet 66mm, and on top of that volutes will all give the same inducer size turbo very different characteristics and power delivery/ability
Is it street use, drag use, manual/auto etc etc ?
A Cheapo chinese 66mm, a basic branded cast 66mm, and fancy billet 66mm, and on top of that volutes will all give the same inducer size turbo very different characteristics and power delivery/ability
Is it street use, drag use, manual/auto etc etc ?
9 Second Club
Joined: Oct 2006
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I was running twin 6266's making 1145/1269. CAr was absolutely uncomfortable on the street. Could have went back to pump gas and lowered the boost, would have helped. I'd suggest looking for 500-850 and get the whole combinations etup before you start forgin on past 1000. JMHO
TECH Fanatic
Joined: Nov 2001
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From: KS
I was running twin 6266's making 1145/1269. CAr was absolutely uncomfortable on the street. Could have went back to pump gas and lowered the boost, would have helped. I'd suggest looking for 500-850 and get the whole combinations etup before you start forgin on past 1000. JMHO