Hypforlife32

iTrader: (5)

Whats up guys, i have a few questions about my fuel setup. long story short i made 1025whp through my th400 with twin 450 in tank walbros.

Car is a 99 camaro plastic tank - current squash hanger

My base pressure is a little high of 55 with boost reference. 25psi of boost puts me at about 80 which like i said is a little high for walbros.

I know dropping base down to about 43 will help out some but im looking to make over 1100. for now

My options -
1st - Triple 450s in tank
2nd - Stock bucket, bulkhead fitting -8 to fuel filter. SINGLE 450 as well as a bulkhead on bottom of tank with magnafuel 4703 on a hobbs switch. with a Y into the fuel filter. Also have a switch for manual overide over hobbs if your flat out at the track.

Last is a single pump in tank to a surge tank with a 4703 feeding from hobbs.

I have a buddy on a similar car who ran out of fuel with his 4303, thats why im looking into the 4703. E85 car.

Stock pcm as well!

Any input would be great guys. thanks!

pantera_efi

iTrader: (1)

Hi, the Porsche Turbo uses TWO electric pumps INLINE.

THUS Option #3 add a CIS pump rated at 100 psi to each channel in series.

Lance

tech@WS6store

iTrader: (2)

Instead of Y-ing them together, run them to each rail.
BUT you may be overlooking the power supply issue. What alternator/battery combo do you have? What balancer are you running?

stevieturbo

You dont mention what fuel you're using ?

A pair of 450's should be able to do well in excess of 1k on pump/race fuel without worry.

Is fuel pressure dropping ? How are IDC's ?

Size of lines, filters etc ? How is wiring, voltage at pump under load ?

You could BAP on one of the pumps which would offer a decent improvement. Not sure if a BAP could tolerate two of those pumps.

Dian

interesting. any idea why this didnt work for me?

https://ls1tech.com/forums/fueling-i...fuel-pump.html

stevieturbo

Why are you trying to pump through a fixed orifice ?

That serves no real world purpose.

And if you want to see what work either pump is doing regardless of perceived pressure/flow, measure pump current.

And pretty sure the 044/AEM will be ( trying to ) outflowing your 255 at all times in that test, so not really able to contribute much ?

gametech

iTrader: (1)

You are in the deep end of the pool now. Find a belt-drive mechanical pump, and keep one of your electric pumps as a primer to avoid vapor lock.

Lonnies Performance

iTrader: (16)

Your twin 450 pumps will support probably 1400rwhp. I'm assuming you already have a -8 supply line with a good front mounted regulator. Twin 255's will support over 1000rwhp when designed properly.

What you need to do is put in the proper size injectors so they will flow the appropriate amount of fuel at 43psi or even slightly lower (maybe 35) if desired. Then your pump capacity will increase as the pumps are operating at a pressure they were designer for.

Correct what needs fixed instead of trying to band-aid it with parts you do not need. Otherwise you will end up ruining pumps & blowing out internal fuel lines & end up with more problems.

Hypforlife32

iTrader: (5)

I have Id2000s at 71 percent duty cycle. I think you may be refering to pump gas or a race gas. I have never seen once a e85 car clip 1200whp in an auto application. Everywhere rates twin 450 pumps at 1200whp which stick shift guys accomplish. am i missing something?

Hypforlife32

iTrader: (5)

I run e85, 23 lbs was about 62 percent IDC on the 2k injectors. to make 50 whp more we had to add a lot of injector all the sudden. about 71 percent for 50 whp. and inconsitent AFR

Voltage is fine. 13.4ish underload. -10 feed split to -8s before the rails. large regulator. both pumps have there own relays and circuit breakers. my tuner said pressure is dropping.

Hypforlife32

iTrader: (5)

Are you refering to e85 or pump/race gas? I do Run e85.