Should I upgrade to 30lb Injectors?

Brent Francis

New Member
Feb 19, 2019
9
0
1
51
Maryland
Car came to me with 24lb injectors, Edelbrock Performer RPM intake, 70mm throttle body, aluminum heads, powerdyne supercharger, crower stage 1 cam with 1.7 rockers, BBK headers, Crane ignition box, 5 speed with 373 gears. I want more power so am thinking of upgrading to 30lb injectors. What do you think?
 
  • Sponsors(?)


90sickfox

I didn't really have an issue with the stink...
SN Certified Technician
Mar 2, 2015
5,319
4,360
203
42
With the supercharger you should be running at least 30lb injectors. 42lb would get you in the factory ford lightening range.

If you change the injectors don't forget the mass air flow has to match....or your tune needs adjusting.

If you want more power looks like you'll need a smaller blower pulley to up the boost. No idea where you are ( as far as boost ) now though.
 

Dan02gt

10 Year Member
Mar 2, 2003
603
252
103
Greenville, NC
So you have a H/C/I set up with a supercharger and 24 lbs injectors? I would think you have those 24s maxed out. There is a chart floating around that gives recommendations for injector size based on HP.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
28,753
10,775
224
Box behind Walmart
www.stangnet.com
I would imagine that there's a Fuel Management Unit in there somewhere perhaps?

Anything that you do with injectors larger than 24s is going to require a tune. You need to factor this in when talking about swapping to larger ones.

Swapping to 30 lb injectors over 24's wouldn't be my first pick either.

If you're going to go through all the hassle, I might pick an injector that's large enough for I plan to do once the blower runs out of steam.

How is the rest of your fuel system? Pump, rails? All stock?

Edit: Oh, and the alternator.
 
Last edited:
  • Like
Reactions: JimZim

2000xp8

SN Certified Technician
Aug 8, 2003
6,885
1,029
194
NJ
If it runs well and reliable you may not want to mess with it.
Powerdynes aren't exactly known to be the highest quality supercharger.
Before i'd add more boost and spin it faster, i'd want it serviced and/or upgraded.

I believe 928 motorsports is the only place to get parts or have one upgraded.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
28,753
10,775
224
Box behind Walmart
www.stangnet.com
If it runs well and reliable you may not want to mess with it.
Powerdynes aren't exactly known to be the highest quality supercharger.
Before i'd add more boost and spin it faster, i'd want it serviced and/or upgraded.

I believe 928 motorsports is the only place to get parts or have one upgraded.

This is what I'm thinking... except for the keeping of the SC.

Unless the plan to add a significant amount of boost through say... an S-Trim or something along those lines, I can't see a reason to go through all the hassle of swapping injectors. I've a suspicion that other components might also need an upgrade to accomodate an injector large enough to make it worth it.

If there is an FMU in the mix, swapping to a larger injector can be a can of worms.

We really do need a complete list of current fuel system components.
 

VibrantRedGT

"STANGNET'S PENGUIN SMACKER"
15 Year Member
Nov 29, 1999
14,689
434
144
49
Boca Raton, Florida
www.mustangworks.com
I over inject everything. Went lean on my Vortech supercharged H/C/I/E car and paid the ultimate price. Had to go 347 Stroker and even that had 36lb injectors, Pro-M 80MM MAF. My current 94 project car with just an Edelbrock Performer intake, BBK X-Pipe and Flowmaster 2.5" Cat Back (no other mods) has 24 pound injectors and BBK 76MM MAF.

Oh and I over exhaust everything too. With the Vortech Supercharger it had MAC 1-5/8" Long Tubes, MAC 2.5 Inch Prochamber and MAC 2.5 Inch Cat Back. When I went 347 Stroker it had MAC Ceramic Coated 1-3/4" Long Tubes with 3" Collector, MAC 3" Inch Prochamber and MAC 3 Inch Cat Back.
 
  • Like
Reactions: General karthief

Wayne Waldrep

Before I post a pic, do you have one of yours?
15 Year Member
Apr 14, 2003
876
453
83
53
Cuba, AL
I had a Powerdyne blower on a stock engine long ago. It was stock so no comparison to your set-up but like others have said, that blower is a very basic unit with an FMU. When I first installed mine it was virtually silent. It made decent power but nothing big. I sent it back to Powerdyne and they put the newer upgraded impeller in and man what a difference. The blower was loud and whistling then....I loved it...lol. It put out much better power then. It was a 9psi unit but I never saw over 7.5psi. Back then people would try and put a smaller pulley on but most of them had trouble at that point. It has an internal cog belt instead of gears and just doesn't respond to a lot of extra spinning in my opinion. It a great simple bolt on. I'd say if you decide to go with bigger injectors to ditch the FMU and tune it to run without it. Do lots of research before though since things have changed a lot since my heyday. I built an N/A engine as my last performance build and ran 24# injectors. They were running at 85% duty cycle with a dyno of 321hp at the tires. That's past the comfort level really. That was also 15 years ago.
 
  • Like
Reactions: JimZim

JimZim

Member
Feb 20, 2019
35
16
18
64
Indiana
30 lb. injectors, Quarter Horse (Moates) tuner, adjustable fuel regulator and 190 LPH (min.) pump would be a good way to go. I was able to street tune without bypass tube after some effort learning adjustable parameters and tables. NO warning lights or backfires with Powerdyne 9 lb. , exhaust and intake improvements.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
28,753
10,775
224
Box behind Walmart
www.stangnet.com
30 lb. injectors, Quarter Horse (Moates) tuner, adjustable fuel regulator and 190 LPH (min.) pump would be a good way to go. I was able to street tune without bypass tube after some effort learning adjustable parameters and tables. NO warning lights or backfires with Powerdyne 9 lb. , exhaust and intake improvements.
I'd be a bit wary of that 190L when using with an FMU. For whatever reason, the 190L Walbro in-tank pumps have a tendency to pop the internal bypass in the pump during elevated fuel pressures. You can imagine what might happen if fuel flow fell on its face while you're in boost.

You have 30's an a tuner but I figured it would be worth mentioning for FMU folks.
 

Blown88GT

Founding Member
Nov 13, 1999
2,046
468
134
Palm Beach Gardens, FL
Car came to me with 24lb injectors, Edelbrock Performer RPM intake, 70mm throttle body, aluminum heads, powerdyne supercharger, crower stage 1 cam with 1.7 rockers, BBK headers, Crane ignition box, 5 speed with 373 gears. I want more power so am thinking of upgrading to 30lb injectors. What do you think?
Powerdyne SC is 6lbs. Total max HP < 300.
You're fine, even though I would love to sell you my FRP 30lb'ers
 

JimZim

Member
Feb 20, 2019
35
16
18
64
Indiana
Walbro has the GPA series pump but I have alway looked for the GSL line for the 190 or 255 liter unit. Is the GPA's the series of pumps that you were referin to with the internal bypass?
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
28,753
10,775
224
Box behind Walmart
www.stangnet.com
Walbro has the GPA series pump but I have alway looked for the GSL line for the 190 or 255 liter unit. Is the GPA's the series of pumps that you were referin to with the internal bypass?
I'm not sure it was specified at the time other than to say it affected units that were not designated "high pressure". Here's a link to the article:
https://www.stangnet.com/mustang-forums/resources/fuel-flow-forensics.55/history

It's a download and the button is in the upper right hand corner
1550709006049.png
 
  • Like
Reactions: JimZim

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
28,753
10,775
224
Box behind Walmart
www.stangnet.com
Good reading. Thanks for the link.
I still have that issue still laying around somewhere. Years after first reading it (when I couldn't find the magazine to save my life) I found that same article online.

It is very good at breaking the different pumps down into like terms. I've also used it as a good explanation of the difference between pressure and volume in fuel delivery conversations.
 
  • Like
Reactions: General karthief

Brent Francis

New Member
Feb 19, 2019
9
0
1
51
Maryland
I would imagine that there's a Fuel Management Unit in there somewhere perhaps?

Anything that you do with injectors larger than 24s is going to require a tune. You need to factor this in when talking about swapping to larger ones.

Swapping to 30 lb injectors over 24's wouldn't be my first pick either.

If you're going to go through all the hassle, I might pick an injector that's large enough for I plan to do once the blower runs out of steam.

How is the rest of your fuel system? Pump, rails? All stock?

Edit: Oh, and the alternator.
 
Thread starter Similar threads Forum Replies Date
P low mile,all original 7up, should I upgrade it or not? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 61
Gunmonkey Forced Induction 93 with HCI. Getting ready to supercharge. Anything I should upgrade internally first? Fox 5.0 Mustang Tech 8
M Upgrading to BOSS 302 intake manifold, should I beef up auto tranny? 2010 - 2014 Specific Tech 2
txredgt And the next upgrade should be? 1996 - 2004 SN95 Mustang -General/Talk- 5
Chowder Head Suspension upgrade...what bushings should I get? 1994 - 1995 Specific Tech 11
053vstang Should I upgrade to Shelby GT500 suspension 2005 - 2009 Specific Tech 3
killer5.0 want to do a brake upgrade and i want new rims...should i swap to 5-lug? what do i.. Fox 5.0 Mustang Tech 20
SCalla1384 Need new Rotors, going to upgrade what should I get? SN95 4.6L Mustang Tech 6
CobraRed_96_GT Should I upgrade me coil packs SN95 4.6L Mustang Tech 9
streetstang67 Questionable alternator...should I upgrade? Classic Mustang Specific Tech 6
1993SSP GT40 heads, what should I upgrade? Fox 5.0 Mustang Tech 3
Yellow302 Picked XE270HR-14 cam to go with my GT40p's should i upgrade springs? 1994 - 1995 Specific Tech 13
BigChiefSmokem Should I upgrade my brakes, or just get fluid flushed and new pads? SN95 4.6L Mustang Tech 22
98blackstallion need new MAF sensor which one should i upgrade too? SN95 4.6L Mustang Tech 5
2 Suspension Upgrade to M5400A - What bushing should I replace? SN95 4.6L Mustang Tech 6
InMyPrimeSVT Should I upgrade my thermostat? Fox 5.0 Mustang Tech 23
BlueOvalStangGT How much power are 36# injectors good for? Should I upgrade? 1994 - 1995 Specific Tech 11
GDawg What engine parts should you upgrade when putting in a SC? SN95 4.6L Mustang Tech 4
sodaking663rd should i upgrade the injectors? Fox 5.0 Mustang Tech 3
BlueOvalStangGT Shop says I need new gears, should I upgrade to something else? 1994 - 1995 Specific Tech 22
R Should I get the upgraded front controll arms? 1994 - 1995 Specific Tech 7
M Should i upgrade my chargin system? Mustang Sound & Shine All 8
BlownStangGT How much fuel system upgrade should I consider? Fox 5.0 Mustang Tech 6
Craig Mack 295/35/18 rubber isnt cutting it, what should I upgrade to? SN95 4.6L Mustang Tech 32
D Should I upgrade my exhaust?-Which one if I do? SVT Tech Forum 10
D How far apart should LT header exit pipes be - x pipe won’t fit headers SN95 4.6L Mustang Tech 1
H 2000 mustang gt should I supercharge 1996 - 2004 SN95 Mustang -General/Talk- 4
markinms Engine Should Auto Trans Be in Drive When Setting Base Idle Fox 5.0 Mustang Tech 7
LILCBRA This should be required viewing for haters 1974 - 1978 Mustang II Talk & Tech 9
C 1998 v6 automatic should I manual swap it? 1996 - 2004 SN95 Mustang -General/Talk- 4
revcor Suspension Previous owner installed cheap no name coilovers, included a box of a bunch of extra coilover hardware, should I be concerned? Fox 5.0 Mustang Tech 1
L Just bought 2010 GT with 38k, what should I look out for? 2010 - 2014 Specific Tech 3
S Should I mod the 302 or run the 390? 1965 - 1973 Classic Mustangs -General/Talk- 34
1989FoxFan Interior and Upholstery [Solved!] Should I replace the pads and cables for my top 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
A How should I go about getting to 600hp? 2005 - 2009 Specific Tech 3
Prerunner5.0 Buying a 5.8 swapped Stang, anything I should be aware of? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 34
79pace Moates / TwEECer / MicroSquirt? Which one should I look into? Digital Self-tuning Forum 16
K Fox Should I/would you still use single after market gauges? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 5
9 Should i buy a 3v 2005 - 2014 S-197 Mustang -General/Talk- 2
derek2079 After installing a 195F Thermostat my car runs hotter and I don't like it. What temp should I run? I don't know what temp was in there before? Classic Mustang Specific Tech 9
D 19641/2 Mustang convertible valve covers need to know what color they should be 1965 - 1973 Classic Mustangs -General/Talk- 15
Mstng93SSP Should I just swap the whole tank? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 31
M Digital Tuning What should I set my AFR to? Fox 5.0 Mustang Tech 10
J What should I put in a 1998 GT roller? SN95 4.6L Mustang Tech 1
K (UPDATE, more pictures!) I was just offered a Fox Body for $1,000. Help me decide if I should take on this burden 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 44
E Rebuilding need advice as to what kit I should get and what bore 1994 - 1995 Specific Tech 19
Hudson N Should it run with IAC unplugged? 04 gt SN95 4.6L Mustang Tech 6
J What setup should I choose, ,331,or 347? Fox Engine Swaparoo 4
M manual calls for 6qts what should dipstick read 1996 - 2004 SN95 Mustang -General/Talk- 1
gonzo.ayres looking at selling my mustang ii and buying an s197. Anything i should look for and look out for? 2005 - 2009 Specific Tech 6
Similar threads