I made 704whp sbc 350cid, glide, 12bolt witj 3.55

 

you were on a VERY happy Dyno...

80lb injectors on e85 are good for around 750 to the Flywheel....maybe 575 to the tire with a stick shift

I'm curious too as i am putting an l33 with 80s.
Is that with 58 psi base? What pump?

the math is based on actual flow.....doesnt matter if its 80lb rated at 43 psi, or 80lb rated at 90 psi......
80 lb/hr flow...is only good for 750 to the flywheel (at the Most...) on e85

 

I'm curious too as i am putting an l33 with 80s.
Is that with 58 psi base? What pump?

 

http://www.promracing.com/injector.php/

 

not sure about hp numbers but stock48 ran 8.90 at 157 on 83# ers on corn. denmah made 720 wheel as well. not sure if he was maxed or not.

 

Must be a bunch of base pressure going on or something. I'm using about 135lbs of fuel on my car per injector running about the same MPH. Car/Weight aside.

 

I went 9.78 at 140mph at 3500lbs s10 blazer stock suspension. To top it off on with a china 74mm single turbo, china heads, hell i think the injectors are china smartfire 80lb dual 255lph walbros sbc 350cid stock crank 2 bolt main oem roller block 15lbs of boost

 

If you a common injector such as the Siemens Deka 80lb/hr that are rated at 43.5psi and change the base to 75psi the flow rate is raised to 105lb/hr. As an example:
(105lbs/hr X .80 DC) ÷ 0.80BSFC = 105hp/inj
105hp/inj X 8 = 840cshp

Someone may chime in with a more accurate BSFC value but I think .8 is a reasonable number and at 80% duty cycle there is some extra capacity figured in. Some people have run higher base pressure but I have personally run the Siemens Injectors at 75psi base for the last couple years with zero problems. Hope this helps.

 

I think he crutched it with a meth system.

 

Had 80's on a 4V cobra on E85 and higher fuel pressure, through a Th400 was high 7xx whp but were maxed

 

E85 and meth my 80s maxed running low 9s at 58psi base.

 

80lbs base pressure made 720 through a th400 and e85. Cars been 147mph at 3680 lbs 98% idc

 

But according to S2H its not possible

 

I went 158mph at 3350 lbs on 83's and 70 base psi E85 no meth inj. That run was only 125 mph in the 1/8. Track was really bad that night and had to peddle car a lot. Had another pass that was almost 128 in the 1/8 but had to abort just past due to traction. That was a cast S475/83 on 16-17 psi. Later after switching to a cast S480 and 20 psi it was out of fuel really quick. The meth inj and 2000cc injectors were installed after. Funny thing was the 2000 cc's on 43 base ran my 4303 pumpout of fuel about the same power as the 83's maxed out at 70 base.

 

850+ rwhp dyno proven on a few cars, my fox at 3340lbs on mud and snow tires went 159mph on the 80lb injectors. If you turn up the fuel pressure(100 in boost) and run high duty cycle(over 100% as that is just a calculated number), they will support a lot of power. We have had ZERO issues doing this on many setups for years. 143-146% on stock ecu and holley is when they will stop adding fuel, this has been tested and proven.

 

Just because the idc is over 100% does that mean is still flowing more? I was told it doesn't. So f idc is 150% essentially your flowing 120 lbs of fuel at same base pressure they rated at for 80lbs per hour?

 

My Vega made 729hp with the 80 lb Siemens injectors at 58 psi base on e85. They were showing over 100% IDC by 6,000 rpm.

 

Awesome info here. Not really looking to run huge injectors if I can get away with it.

 

Call me crazy, but 100psi+ on injector o rings is scary. Hahah

 

Especially through some plastic truck rails. They don't exactly have the most rigid mounting points but they work... lol

 

I see 110-115psi fuel pressure on my Siemens Injectors that are +6yrs old with no issues under race conditions. I had the fuel system dry for a couple months during winter upgrades and when I primed the lines back up the injector rails leaked like two shower heads. The o-rings had lost their elasticity and looked tire shaped with a flat outer side instead of being doughnut shaped. This was on methanol and never had any issues keeping methanol in the system just capping the vent on the cell. Replaced o-rings and had no more issues.

 

Dang thats alot of pressure lol

 

That's at 35psi boost pressure.

 

"when I primed the lines back up the injector rails leaked like two shower heads. The o-rings had lost their elasticity and looked tire shaped with a flat outer side instead of being doughnut shaped"
I see this on injs I flow/clean. After a couple showers in flow fluid, I make it a practice to change them before I do the initial test. Some alky inj o'rings I remove are so hard that they crack when I take them off.
If I know they are an alky app, I can use o'rings designed for such.

 

Couple years I made around 940rwhp on e85 through a 6-speed...if I recall base pressure was around 60psi and DC was around 108% according to SCT log

 

Lold at 940 wheel on e85

 

Glad you find it funny, but doesnt make it any less true

Found the info from my thread from years ago
-Built 4.6 w/ precision 7675
-24psi --- 945 rwhp/891 tq
-injector duty cycle was 107% so they were maxed out, but the A/F was steady

 

What did it trap

 

It went 141 on 13psi(700rwhp on same dyno) so the dyno numbers were right in line for a 3500lb race weight.

I ended up making changes at the end of the season which included ID 1000cc injectors and next season it made roughly the same numbers with injector DC around 88%