scorke

iTrader: (18)

What are you guys running for fuel delivery and what sort of duty cycles are you seeing on pump gas and race gas. I have 780s right now but feel I might be pushing them close to the edge on race gas, what do you reckon? Walboro too but everything else is stock.

Scorke

evo_08

iTrader: (1)

i have ams 1000hp fuel system and rc1200cc injectors.

dubbleugly01

iTrader: (24)

I'm seeing upper 80's for duty cycles on PTE 780's on a 50 trim, stock block and head, cammed, with AMS Vsr, Walbro, on pump gas with a/f's of low 11's. Redline set at 7800. I think you'll need bigger injectors at a minimum.

scorke

iTrader: (18)

What power/boost are you seeing those duty cycles at?

Scorke

8URVTEC

iTrader: (13)

IA Performance went with the recommendations of David Buschur. He recommended the dual pump system and an adjustable fuel pressure regulator. I have a 2.3L, Stage 3 head and GT35r. Before this was only a single Walbro 255lph and 1000cc PTE's it was running in the upper 90 duty cycle on 33psi of boost.

scorke

iTrader: (18)

Really upper 90s at 33 psi, what power were you putting down?
I am thinking 1000's are the way to go, I don't want to mess wit the duel pump, fpr maybe.

Scorke

dubbleugly01

iTrader: (24)

360 whp on a conservative DD, or about 410-420 whp on a dynojet. This was at 22#'s boost.

scorke

iTrader: (18)

Jesus i have made 490 480 on my 780s on topspeeds dynojet at 30 psi. I had room to go, im thinking 9 somethings.

Scorke

8URVTEC

iTrader: (13)

563hp and 513ft/lbs on a Mustang Dyno, don't know what that is on a dynojet! WIth the new pumps, fpr and new clutch I think low 600's is possible.

CBRD

iTrader: (60)

im at 441whp on our mustang.... 850 cc's... im at about 70-82% IDC... depending on the rev range...

this is on pump gas... I also have 1000's in the cabinet, and will be going to the upgraded walbro for now (the modded one)

cb

dubbleugly01

iTrader: (24)

yeah, tell me about it. Either the DD is extremely consevative (overly consevative), or maybe my wideband was reading conervatively, or my system is whacked out. I did get another set of new 780's on the off chance the first set wasn't flowing properly. Same result...... upper 80's on duty cycle. I'm running about 47'# base fuel pressure to boot.

Per RC Engineerings injector calculator, it predicts my injectors almost perfectly at a bsfc of .65. But alot of people seem to make more hp on smaller injectors and lower duty cycle than my example.

I'm sure you've seen this, but here's a convenient link for others

http://www.rceng.com/technical.htm#WORKSHEET

scorke

iTrader: (18)

Yeah damn, sounds about consistent with what I ahve heard abotu 780s. I feel like 850-1000's will be a good comprimise for what I am looking to do, maybe 950's.

8urvtec sounds like your setup worked pretty damn well.

Scorke

8URVTEC

iTrader: (13)

Scorke, that is all before the twin pumps and fpr! The new stuff is suppose to be installed next week, we will see new numbers I am sure after they retune!!!!!

Spooldyou

iTrader: (52)

i have 1000cc's in my car now, and its seems to be alittle overkill to be honest for pump gas. i think i over shot it with the that size, But, i think that i might be in the market in for a set of 880s... Im on the stock ECU.

If your running AEM the injector driver isnt as efficent, which might yield the need for a bigger injector, if your running the stock ECU too, then i would suggest 880s

Nesiop

iTrader: (25)

AEM or not I have heard from a few big time tuners the Injector driver box is a pos and is pointless.