Where do 80# inj top out on E85
07-13-2018, 12:43 PM
#1
Where do 80# inj top out on E85 Doing some upgrades to my street car. And converting to E85. It has DEKA 80# inj AT WHAT HP DO THEY TOP OUT? Thanks
Set up is
LS1 block
Forged pistons (dish)
H beam rods
BTR stage 2 turbo cam
Ported 799 heads (race flow valves)
96mm intake
92mm TB
80mm turbo
Trans is built 350 with a break
9" rear (QP)
Set up is
LS1 block
Forged pistons (dish)
H beam rods
BTR stage 2 turbo cam
Ported 799 heads (race flow valves)
96mm intake
92mm TB
80mm turbo
Trans is built 350 with a break
9" rear (QP)
07-13-2018, 12:55 PM
#5
Plan on taking it to vengeance to get a Dino tune so referring to wheel hp. I know I could push the limits on my part with pump gas and meth (I have a kit) just don't want to leave I live on the table with topped out injectors because I swapped to e85
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07-14-2018, 04:58 PM
#10
Restricted User
Jarrett was running mid 8s back when he had the SBE record and was on E85 with a single magnafuel pump and 80 lb injectors. 70 PSI base fuel pressure and over 20 PSI of boost.
07-14-2018, 06:06 PM
#11
yes it is a 2005 5.3 with triple 12 cam. fuel system is a black eliminator pump and -8 line to a holley reg. with boost reference. return style . feeding a stock single feed fuel rail from a 2005 sierra deadheaded. 50 psi base engine off. runs up to 6700 rpm.
07-19-2018, 11:58 AM
#16
10 Second Club
iTrader: (2)
I see people running high base pressure to make power with smaller injectors. I’m planning to run lower base (43.5 ish) with larger injectors on the fuel system I’m installing now.
On a street car is there a benefit to either approach or does it really make no difference as long as the AFR requirements are met?
On a street car is there a benefit to either approach or does it really make no difference as long as the AFR requirements are met?
07-19-2018, 12:06 PM
#17
Restricted User
For a given AFR, higher fuel pressure will run better. Better fuel atomization. Injector flow gets sloppy at low pressure and you get more of a squirt/leak than a spray/mist.
07-19-2018, 12:35 PM
#18
07-19-2018, 01:33 PM
#19
Catch 22 kinda thing IMO. I believe GM went up to 58psi from the standard 43 to improve spray patterns and fuel delivery in general. So going lower on the pressure will hurt you there in theory.
Though with the “pencil” spray pattern injectors I don’t really see it being a big issue. They have crap for a spray pattern anyway. 80lb, 160lb, 220lb etc.... They look like a squirt gun at any pressure.
Higher pressures affect the speed an injector opens and closes for sure. How much will depend on a ton of variables. Idle and cruise will be the most affected. A 2:1 rising rate regulator or similar would be a good solution IMO. Or staged/variable DC to the pumps.
Though with the “pencil” spray pattern injectors I don’t really see it being a big issue. They have crap for a spray pattern anyway. 80lb, 160lb, 220lb etc.... They look like a squirt gun at any pressure.
Higher pressures affect the speed an injector opens and closes for sure. How much will depend on a ton of variables. Idle and cruise will be the most affected. A 2:1 rising rate regulator or similar would be a good solution IMO. Or staged/variable DC to the pumps.
07-19-2018, 01:42 PM
#20
Restricted User
Even decapped or injectors with no pintle cap flow much better at high pressure. I've flowed decapped injectors on my little homemade flow tester and 58 PSI made a noticeable difference over 43.5 PSI as far as spray pattern.
Try a meth nozzle at low vs high pressure. It makes the difference between a less flowing shower and a high flow mist.
Try a meth nozzle at low vs high pressure. It makes the difference between a less flowing shower and a high flow mist.
