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-   -   Twin Turbo 4.8 Results / Single 80mm Build (https://ls1tech.com/forums/forced-induction/1880770-twin-turbo-4-8-results-single-80mm-build.html)

svslow 09-17-2017 09:59 AM

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

https://preview.ibb.co/c4SmKQ/IMG_1223.jpg
https://preview.ibb.co/cAvTYk/IMG_0548.jpg
https://preview.ibb.co/cCENtk/IMG_2905.jpg
upload my photos

badass68 09-17-2017 10:26 AM

Hell yeah! Looks good. What trans and using tb?

svslow 09-17-2017 10:42 AM

It's a TH400 with trans brake. Using the "bump box" feature on the MS3Pro.

forcd ind 09-17-2017 11:19 AM

Pretty cool, bad azz ride for sure

svslow 09-17-2017 02:30 PM

Thanks guys.

turbotruck2007 09-17-2017 02:43 PM

Keep at it ... If you do it the numbers will come ..
Nice car ..

rkupon1 09-17-2017 02:46 PM

Cool set up. I dont know everything, so just asking, but is that compression ratio rather low? Any particular reason why? Still some stout numbers, im just curious is all

svslow 09-17-2017 02:59 PM


Originally Posted by rkupon1 (Post 19726846)
Cool set up. I dont know everything, so just asking, but is that compression ratio rather low? Any particular reason why? Still some stout numbers, im just curious is all

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.

3 window 09-17-2017 03:26 PM

Very nice setup. Super clean under the hood!

rkupon1 09-17-2017 04:26 PM


Originally Posted by svslow (Post 19726855)
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.

Got ya. Makes sense now. And it seems to be workn just fine!

stevieturbo 09-17-2017 05:01 PM

And who said lower compressions couldnt work....

And you could easily run a lot more boost very safely too.

SSZ 09-17-2017 06:42 PM

Nice results. Love those little motors that can:judge::judge:

svslow 09-17-2017 08:47 PM

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.

HighLiner 09-17-2017 09:31 PM

did you use to race this car at Mid Michigan with the 4 banger?

Tjabo 09-17-2017 09:47 PM


Originally Posted by HighLiner (Post 19727082)
did you use to race this car at Mid Michigan with the 4 banger?

Is that Stanton?

HighLiner 09-17-2017 10:30 PM

Yes. Use to be a guy that had one that raced in the street car program

svslow 09-18-2017 06:29 AM


Originally Posted by HighLiner (Post 19727082)
did you use to race this car at Mid Michigan with the 4 banger?

No that's not me. I did the 2.3 turbo thing for a while though, until I got tired of making 400hp.

Forcefed86 09-18-2017 07:51 AM

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! ;)

svslow 09-18-2017 08:04 AM

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.

Forcefed86 09-18-2017 09:05 AM

Sounds like a great option, I hadn’t seen anyone using those before. Does the guy have a link to his build? Curious about the rest of the engine run down. Any track times with it? What kind of boost?


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