A DEE O

iTrader: (2)

We were adding fuel in large % incriments and the a/f did not budge. Car is making 11# on dynojet. Pulls were done from 2500 to 6000 rpms. The car jumps to 11# and never falls until I let off. The first pull was 597rwhp 594rwtq with an 11.3 A/F until 5200 where it went to 12.1 to 12.3 when I let off. I had 0 knock on that run. We then tried to richen that span and did not have much luck. The car was jumping on the dyno and I blew out my A/F box for the dyno. It was reading 92F in the shop. I figured I would tune it on a hot day, to know I would be safe a majority of the time. The car seems to love 11.0 across the board and the most we could get was 11.7 in the upper rpms? The car also "shrudders", at certain rpms 4.5k and above, with 0 knock. The only thing we can come up with is that it may be running out of injector. I was also maxing the MAF at certain times today? It is stock with ends. Help, Angelo

MelloYellow

Pump setup?

A DEE O

iTrader: (2)

Inline Wal GSL392

A DEE O

iTrader: (2)

Lightbulb! Intank. What kind? Thank You

y2khawk

iTrader: (5)

Dual 340's

We were on the dyno w/ an Incon setup, 10.5 to 11 psi, SVO 42's, single intank 340, and full returning fuel system. Pump starts to run out at 6k RPM. 600 RWHP dynojet, 580 RWHP Mustang dyno. Same setup.

Still have some injector left, but not much.

Have you hot wired the pump, it'll get you a little breathing room. But not much.

There's always a sumped tank and a BIG external

http://harlan-engineering.com/fuelsystem/

BIGBOS

I'm using 42.5 injectors....255inline, 255intank, CAS regulator, and hotwired pump...my fuel pressure will stay at like 63psi no matter what....

Thats with my 372 iron block....

A DEE O

iTrader: (2)

I will try and be brief. Friday morning I filled up with 100oct at the pump. After leaving that station I floored it and it started bucking and not making any boost. Finally I figured I had gotten a BAD tank of gas. I burned out that $42, pretty much N/A. Sat night I went to a different station and got 100 at the pump. I went to floor it and I got a loud backfire and the car would barley move. The EGTS would soar and the manifolds were glowing red. I have now been told that the pcm went into fail safe evey time I went to WOT with the bad gas (3-4), times, it retareded the timing. The car never, even with 11#, ran out of fuel. I still have the stock fuel filter, which now may be clogged with sediment. It was suggested that the abuse the stocker in the tank has seen, is finally saying adeeo. I will do an intank, or two and a new fuel filter. My brother in law said it may be a good idea to check to plugs. Then a retune and off to the track, hopefully.

BIGBOS

I've been running around on 100 since I've gotten my car back for a few days, its been hot out and I don't want to take any chances, my car isn't fully tuned yet....

Don't want to come close to going lean....

A DEE O

iTrader: (2)

I guess the moral of the story is to buy 55gal drums of race gas, the stuff at the pump, sucks. Even if its not the sediment, which this was for sure. They had the race pumps bagged that evening i had a chance to go back there.

BIGBOS

How much does a 55 gal drum of 100 or 110 unleaded usually cost...

I recently found a spot by me that has 110 unleaded all the time...

y2khawk

iTrader: (5)

my normal station has 110 turbo blue for $3.50 a gallon, year round Good run around gas for me.

I just split a drum of C16 with DERTY, it was around $420 for 55 gallons. Good ****

Crunch

I think I may have to do this.
My fuel pressure will NOT stay up. As soon as I drop the hammer, it begins the slow march to 30PSI by 6400RPMs. You can feel the car just lagging the higher up the RPMs go.
Damn FUEL!!!

smokinHawk

iTrader: (48)

Got walbors

http://www.cofba.org/users/smokinhaw...-pics/fuel.htm

DERTY

Nothing like a little 118 Octane for breakfast. Now go back to bed!

cablebandit

iTrader: (37)

I would say dual pumps and a rising rate regulator and you will be fine for 600 rwhp with those injectors.

y2khawk

iTrader: (5)

:p :p :p :p

S_J_H

Monitor your fuel pressure and injector pulsewidth.
60000/rpm*2= max available on time for the injectors. So if you see 20ms at 6000rpm, you are maxed out.
I am using 42.5's at 62psi at full boost with the PE table leaned out to compensate for my alky system.I'll run anywhere from 10.7-11.7 A-F.
I would be maxed on the injectors if I tried to run it at 11.0-1 with no alky.I am at around 90-95% duty cycle plus enough alky for another 60-75hp.
I run a external aeromotive pump with top mount 10an custom pickup.I run 14psi in a 348.
Also,how much timing are you running?
Steve

RICE ETR

iTrader: (3)

Hey Harlan, what A/F ratio are you tuning for with 110 gas? Didn't know if it was the same as pump or what.

Thanks

1dirtyZ

iTrader: (1)

holy crap! what size hose are you running from the "Y" to the pump harlan?? -10??

smok'n, i was thinking of doing what you did but i wasn't sure how to do it , thanks for the pics.

what harm would it do if you left the return part as is ( from the "T" back to the tank)??
what did you use to seal the hole where the wire comes out?

Pro Stock John

iTrader: (34)

Do you have a FP gauge on the car, is the FP keeping up at higher rpms?

I'm running an external Weldon 2025 pump with a Weldon regulator, -10 to the front, and -6 return all braided.

If I did a street version I would look into running dual external Bosch pumps or something that would keep you from needing one huge external.