Vetal

iTrader: (3)

I made few pulls after installing TC78 to my 383ci. It's non-intercooled as of now, at 0.5 bar. HPT showed that at 6000rpm my 42lb injectors are working at 115%. AFR was 10.8. Is this possible? What power I should be making then?? I thought I have no more than 500HP (crank), but apparently injectors shouldn't be maxed out then??

onfire

iTrader: (17)

Very possible with 7.5 lbs of boost through a 383 at 10.8 : 1 AF.....that AF will really work those injectors.

What's the fuel psi? Boost referenced?

dschmittie1

iTrader: (64)

My 60# injectors are at 98% duty cycle with 14psi on my 347 and that is at 83# of fuel preasure at 6500rpm MY base is 58psi at idle with a boost referenced regulator.

onfire

iTrader: (17)

That matches my buddies LPE Vette. 15psi boost, 60# and 98-102DC at 6700rpm......80's are going in this weekend.

Vetal

iTrader: (3)

Stock pressure, stock regulator

dschmittie1

iTrader: (64)

Well I would suggest a Boost Referenced Fuel preasure regulator. It helps take your injectors further. But considering you have a 383 and I am assuming you will turn up the boost at some point get the 60lb injectors aftermarket rails and a BR FPR. When I got my procharger I sold my 42lb injectors right away and got 60's

Louis

iTrader: (7)

Oh yes, definitely out of injector, and potentially less fuel pressure with the returnless setup, not to mention the lack of a 1:1 FPR.

Vetal

iTrader: (3)

So does that mean that I might produce 550-600 crank HP?
I'm thinking more about some 96lb, to be able to run 850-900hp on ethanol... Or is it overkill?

lt170chevelle

iTrader: (2)

Yeah i was going to say maybe you otto go a little bigger than 60s ..my lt1 is almost maxing my 42lbers out at 10lbs and im only a 350...383 will definitely need more injector

Vetal

iTrader: (3)

I'm going to run on ethanol to be safer (less chance of detonation), so thinking about 96lb

dschmittie1

iTrader: (64)

Well I am making 676rwhp on 93 and Meth I have a Buddy with a Procharged C5 with a 383 making 770rwhp on 93 and Meth.

Are you talking about Running e-85? You will need a lot of pump and bigger injectors as e-85 requires more fuel.

Vetal

iTrader: (3)

Yes, E85. You think 96lb will not be enough for 900HP on E85?

Louis

iTrader: (7)

900 rwhp? Or FWHP? you would be nearing the end of the injector at 900 rwhp and E85. It all depends on pump size, base fuel pressure, and a lot of other little bits, but it should be damn close!

Sluggish

iTrader: (10)

All I could run was 8psi with my 42lbers also.

Vetal

iTrader: (3)

Was thinking about 900@fly, but might as well go for 1000... TC78 is rated at 1100, so maybe 1000 is achievable...