Power Limit on 47lb Injectors

[hossman]

Anyone know what is the power limits on the 47lb injectors running 93 pump gas? I’m doing some upgrades on my 17 Roush Phase 2 with a VMP 67mm twin jet throttle body and PMAS intake along with VMP custom tune.

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[Guard5.0]

I think anything above the Phase 2 will likely require larger injectors. I went to a VMP custom tune after the Phase 2 (original 47’s) and Brenspeed installed Deatschwerk 95lb injectors for the upgrade. On a 93 tune I’m right at 700rwhp. Not sure there is a cut and dried hp limit but both Brenspeed and VMP required larger to go to the current hp level

 

[Guard5.0]

I’m also running the 75mm pulley and the original phase 2 installed BAP

 

[hossman]

Wonder if the 56lb injectors will work or need to go with FIC1000’s.

 

[Guard5.0]

Your call. I wouldn’t. If you’re like most this won’t be the last tune. I’d just go ahead with the ID1000’s or DW 95’s or similar. Give you some nice room for growth. Mathematically the 47’s are tapped out where you’re at. The 56’s may get you one more upgrade.

 

[hossman]

Thanks for the advice!

 

[cdq85]

I'm on 56lb injectors with phase 2 roush. 82mm pulley. It's somewhere around 645whp. I believe VMP told me if I wanted to go anymore, I'd need more injector.

 

[sy1462]

It irritates me to death with this setup you can't see pulse width or injector duty cycle. About all you can do is watch other PID's... knock, short term fuel trim, AFR, etc. to know if you are in or nearing saturation. FWIW, I'm still using the 47lb injectors with the phase 2 setup and VMP 93 tune and it runs very well. With that said I know I am running on the ragged edge... planning on upgrading them but I hate to mess with it since the tune is very good.

 

[hossman]

Ive been going back and forth with VMP about the upgrades they will be installing on my 17 Mustang GT Roush Phase 2 and they said no need to upgrade the 47lb injectors that came with the kit. Below is my car and set up an what is getting installed.

2017 Mustang GT
- 6 Speed Manual
- 3.55 Gears
- Roush Phase 2 Supercharger
- 80mm Pulley
- 60mm Throttle Body
- 47lb Injectors
- Boost-A-Pump
- Roush Axle Back Exhaust
- Steeda H Pipe
- BMR Rear Vertical Links
- BMR Rear Cradle Lockout Kit
- VMP Remote Custom Tune
- HP Tuners Ngauge

Here is what VMP is installing....

- VMP Twin 67 Throttle Body
- Pmas Supercharger Cold Air Intake
- RR14YS Silver Spark Plugs
- Dyno Tune

Looking forward to getting around 680whp on 93 pump gas.

 

[WhiteyDog]

Ive been going back and forth with VMP about the upgrades they will be installing on my 17 Mustang GT Roush Phase 2 and they said no need to upgrade the 47lb injectors that came with the kit. Below is my car and set up an what is getting installed.

2017 Mustang GT
- 6 Speed Manual
- 3.55 Gears
- Roush Phase 2 Supercharger
- 80mm Pulley
- 60mm Throttle Body
- 47lb Injectors
- Boost-A-Pump
- Roush Axle Back Exhaust
- Steeda H Pipe
- BMR Rear Vertical Links
- BMR Rear Cradle Lockout Kit
- VMP Remote Custom Tune
- HP Tuners Ngauge

Here is what VMP is installing....

- VMP Twin 67 Throttle Body
- Pmas Supercharger Cold Air Intake
- RR14YS Silver Spark Plugs
- Dyno Tune

Looking forward to getting around 680whp on 93 pump gas.

I'm switching to a somewhat similar set up this winter: 80mm pulley, NGK plugs, JLT 125 CAI, ID1050x's, and another 93 tune by Lund. Lund suggested I go with the 1050x's and I already installed a VMP fuel pump booster, IAT 2 harness, and Reische 170 thermostat last year. Also all suggested by Lund.

 

[djcodeman]

Ive been going back and forth with VMP about the upgrades they will be installing on my 17 Mustang GT Roush Phase 2 and they said no need to upgrade the 47lb injectors that came with the kit. Below is my car and set up an what is getting installed.

2017 Mustang GT
- 6 Speed Manual
- 3.55 Gears
- Roush Phase 2 Supercharger
- 80mm Pulley
- 60mm Throttle Body
- 47lb Injectors
- Boost-A-Pump
- Roush Axle Back Exhaust
- Steeda H Pipe
- BMR Rear Vertical Links
- BMR Rear Cradle Lockout Kit
- VMP Remote Custom Tune
- HP Tuners Ngauge

Here is what VMP is installing....

- VMP Twin 67 Throttle Body
- Pmas Supercharger Cold Air Intake
- RR14YS Silver Spark Plugs
- Dyno Tune

Looking forward to getting around 680whp on 93 pump gas.

thanks for posting that info... i have a really similar setup. will be going to a local tuner here so I can see it on the hub dyno..... was going back and forth about upgrading injectors as well.. will probably just do a BAP and call it a day...

 

[K4fxd]

It irritates me to death with this setup you can't see pulse width or injector duty cycle.

What setup is this? The injector pulse width and duty cycle PID is there.

 

[2022 Mach 1]

Here is a quick chart from summit on injectors.

https://help.summitracing.com/app/answers/detail/a_id/4807/~/what-size-injectors-do-i-need?

 

[Grimreaper]

From old logs they are at 85%DC at 7000rpm on 8 psi (85mm) for a roush tvs with ported lower mani. Once COT hits its 96%dc. This is with stock fuel system and BAP.

They can be taken further if you remove the bottle necks between the pump and fuel rail. Or full fuel system. Its the pressure drop that really hurts them first.

 

[djcodeman]

From old logs they are at 85%DC at 7000rpm on 8 psi (85mm) for a roush tvs with ported lower mani. Once COT hits its 96%dc. This is with stock fuel system and BAP.

They can be taken further if you remove the bottle necks between the pump and fuel rail. Or full fuel system. Its the pressure drop that really hurts them first.

whats the bottle neck you are referring to?

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