Twin Turbo 4.8 Results / Single 80mm Build
#1
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Twin Turbo 4.8 Results / Single 80mm Build
Finally got some results I'm finally happy with. This set up has been fighting me all year.
Chassis: 1984 SVO Mustang, full factory interior, 8pt cage, never been weighed but I figure its 32-3300lbs with me in it. 255 ET Street R tire
Motor: 2009 4.8, 241 heads (about 8.8:1 CR), BTR Stage 2 TT cam, LS1 Intake, stock head gaskets, reused head bolts
Turbos: Home made hot side, Rev9 7268's, Treadstone intercooler
Runs on an MS3Pro Ultimate, 210lb injectors and E85
On 13psi its only been low 10s at 133mph. It takes a good amount of boost to get this thing to move but last night it went 9.32 @ 147.5 on 24psi/14.5*. Need to get the 60' figured out, hoping to see 8.99 next time out.
https://www.youtube.com/watch?v=ba56...ature=youtu.be
upload my photos
Chassis: 1984 SVO Mustang, full factory interior, 8pt cage, never been weighed but I figure its 32-3300lbs with me in it. 255 ET Street R tire
Motor: 2009 4.8, 241 heads (about 8.8:1 CR), BTR Stage 2 TT cam, LS1 Intake, stock head gaskets, reused head bolts
Turbos: Home made hot side, Rev9 7268's, Treadstone intercooler
Runs on an MS3Pro Ultimate, 210lb injectors and E85
On 13psi its only been low 10s at 133mph. It takes a good amount of boost to get this thing to move but last night it went 9.32 @ 147.5 on 24psi/14.5*. Need to get the 60' figured out, hoping to see 8.99 next time out.
https://www.youtube.com/watch?v=ba56...ature=youtu.be
upload my photos
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#8
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Long story short, the motor ended up being a spare parts type build. Its got 241 heads off an LS1 I got for $80. The combustion chambers are a bit bigger than any head a 4.8 came with.
#13
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As everyone says, I definitely think there is more in it. Before that last pass I added 1.5* timing and it picked up 3mph. I've had it on 25-26psi before with a lot lowering timing. Going to wait until we get some cooler air and turn it up a bit more.
#17
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#18
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Congrats! It can’t be in its happy spot timing wise if it’s still picking up that much per degree. How do the straps on the plugs look heat wise?
We need to tap the hotside and see what back pressure is doing with these turbos. Maybe they are working a lot harder than we think. MPH and trap speeds are on par with the small wheel cast S475 setups. (if not a little less). Yet looking at Chris Bishir’s old S366 results… his SBE 5.3 was picking up almost 24+ hp per pound without an intercooler on cast S366’s.
Saw VSracing dropped their S366 clones down $350. That turbine wheel looks funky, but might be worth a shot. I’ll donate $100 if you try them out for us!
We need to tap the hotside and see what back pressure is doing with these turbos. Maybe they are working a lot harder than we think. MPH and trap speeds are on par with the small wheel cast S475 setups. (if not a little less). Yet looking at Chris Bishir’s old S366 results… his SBE 5.3 was picking up almost 24+ hp per pound without an intercooler on cast S366’s.
Saw VSracing dropped their S366 clones down $350. That turbine wheel looks funky, but might be worth a shot. I’ll donate $100 if you try them out for us!
#19
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I have not looked at the plugs. There is a bung in my hotside near the turbine inlet for back pressure, but I've never hooked anything up. I can't imagine the S366's would be any worse than the 72s for spool, and they have been proven to work very well. It would take a little work to make them fit. After seeing a guy on YB make 960whp with a pair of On3 61/65s, those sounds pretty enticing for the price point and would drop right into my car.