Need help choosing the right size fuel injector? Ask in here

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Jan 28, 2015 | 07:01 AM

#76

tscompusa

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From: PA

To quote your original response you deleted:

Quote:

Tom I have a friend with 1450cc FIC's in his car making 540awhp on a mustang dyno with the idc's over 110% running E85 and the tuner says his injectors are maxed out and he needs to go bigger.

This doesn't sit right with me, I think his fuel system is done wrong and he is out of pump. He has one walbro 400lph in tank and a bosch 044 inline by the tank, uses all oem fuel line till it gets to the bosch 044, then goes to -6 from there to the rail.

I told him I want to redo the fuel system like mine and run a double pumper with wally 450's and -8 to the rail with a -6 return and those FIC 1450 injectors should get him over 600 mustang dyno easy.

What do you think?

The answer is, 540WHP on a mustang properly calibrated will be approx 8-12% variance from a dynojet. so 540 is at max 604WHP dynojet.

1450cc inj are good for WAY more then that, so the tuner is clueless to say such a thing, and the fuel pump or something in the fuel system in general is bottlenecked / not working properly.

Jan 28, 2015 | 01:36 PM

#77

Migsubishi

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From: Tampa bay area

Quote:

Originally Posted by tscompusa

To quote your original response you deleted:

The answer is, 540WHP on a mustang properly calibrated will be approx 8-12% variance from a dynojet. so 540 is at max 604WHP dynojet.

1450cc inj are good for WAY more then that, so the tuner is clueless to say such a thing, and the fuel pump or something in the fuel system in general is bottlenecked / not working properly.

I didn't think anyone was going to reply..

Thanks, that's exactly what I was thinking. I'll get to redoing his fuel system right away.

Thanks!

Jan 30, 2015 | 06:26 AM

#78

tscompusa

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From: PA

That's what I figured, so i brought it back & answered it

Feb 5, 2015 | 05:37 PM

#79

ExViTermini

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From: Virginia

dynojet power, 2 255's, 1450's, e85, whats the max the fuel system will support?

Mar 1, 2015 | 06:49 PM

#80

schuhie

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From: WI

OK so I am thinking of upgrading my turbo soon and am looking for some tips on fuel system.
Planned setup:
750cc injectors (currently in car)
Single 255 (currently in car)
Kelford 272 (currently in car)
Ecu boost (to be added)
FP green hta 73 (to be added)

With this on pump 91 will I be able to supply enough fuel to have the 91 be the limiting factor or will it be the 750s?

Last edited by schuhie; Mar 2, 2015 at 05:00 AM.

Mar 2, 2015 | 07:09 PM

#81

sssr20det510

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From: vancouver washington

Looking at 400 on 92 pump stock turbo. 2006 evo 9 What size injectors do u recommend. Also thinking of upgrading turbo later for 500 whp 400 tq and don't want to buy another set later on.

Mar 2, 2015 | 11:37 PM

#82

tscompusa

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From: PA

Quote:

Originally Posted by ExViTermini

dynojet power, 2 255's, 1450's, e85, whats the max the fuel system will support?

I need to know the engine displacement.

Off the top of my head in vd dynojet:

2.0L = 700whp
2.4L = 620whp

Quote:

Originally Posted by schuhie

The injectors will be done before the pump in this case yes. with 440whp or so in vd dynojet you'll be maxed out at 99-100% duty cycle on regular gas based on a customers car i just pulled up.

If you have the $ id probably go up to a 1000cc or so just to give yourself some security.

PM me for pricing.

Quote:

Originally Posted by sssr20det510

Looking at 400 on 92 pump stock turbo. 2006 evo 9 What size injectors do u recommend. Also thinking of upgrading turbo later for 500 whp 400 tq and don't want to buy another set later on.

based on what you just told me id go with something 1000cc+.

FIC 1250cc - 1450cc

PM me for pricing.

Dec 1, 2025 | 11:07 PM

#83

evopapi

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From: San Diego

Quote:

Originally Posted by tscompusa

Choosing the correct injectors for your application based on power level and fuel type

Id like to help others choose the right size injectors for their applications.

I will post some data in here. for now just ask in here and i will respond when i can.

Popular injector brands for the Evo 1-9 include but are not limited to:

FIC
PTE
MAPerformance
Injector Dynamics
Bosch
DW

not sure if thread is still active but
Context*** I have an evo 8 that was setup for a 6766 but I put it on a Evo 9 turbo for a temporary setup
•full radium fuel system
aem rail
aero motive FPR
has two 450s in hangar but only running 1
gscs2 cams
2.3L stroker

I have an evo 9 turbo rn because this is my first Evo and I just wanted to experience it at its “ starting “ form and then build up from there leaning towards what I feel the car lacks or what I want from it . I need new injectors but I don’t want to buy something just for the 9 turbo I would want something that can also handle a FP red or so turbo . Not sure if I’m gonna be pure e 85 maybe but forsure want to be able to run it

Dec 2, 2025 | 06:04 AM

#84

schuhie

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From: WI

Quote:

Originally Posted by evopapi

If the red/black is as big as you plan to go, I'd look at the ID1700x. Its what I run on my car full flex fuel and they are great. And they will have no issue idling or anything like that.