Help with fuel injector selection

[eficonnection]

450-500hp engine build. Using SyTy intake manifold and fuel rails. Adjustable regulator. What injectors do you guys recommend and who sells them?

Thanks!

 

[Quickstop [UK]]

Re: Help with fuel injector selection

High impedance #63 lb SIEMENS injectors are what I have for my planned eventual 600hp. I Got them from Racetronix. They're readily available. Just get high z and don't get the 50s. They're highly variable. I got rid of my 50s and put the 63s in.

Sytyperformance.com do them for $60 each which is about standard.

Plenty of info and recommendations for injectors on here.

Happy New Year!

 

[sytyguy]

Re: Help with fuel injector selection

Sytyperformance.com do them for $60 each which is about standard.

Ahem - http://www.racetronix.biz/itemdesc.asp?ic=FI114961&eq=&Tp=

 

[eficonnection]

Re: Help with fuel injector selection

Ahem - http://www.racetronix.biz/itemdesc.asp?ic=FI114961&eq=&Tp=

Thanks for the Racetronix link.

So one injector is $45.00, but a set of six is $330.00? The markup is $60.00 for a flow matched set? That's a bit much to ask for a flow matched set. No?

 

[sytyguy]

Re: Help with fuel injector selection

I've bought 5 sets and always bought them individually (not flow matched). $270 and no problems. But you do whatever your heart desires.

 

[Quickstop [UK]]

Re: Help with fuel injector selection

Ahem - http://www.racetronix.biz/itemdesc.asp?ic=FI114961&eq=&Tp=

Now I remember - that's them

And I did say "about"

 

[Flyin Ryan]

Re: Help with fuel injector selection

http://www.turbotweakstore.com/ProductDetails.asp?ProductCode=1010-FM

A vender here as well

 

[Gnocide]

Re: Help with fuel injector selection

i would listen to they guys above that have times at the track to prove.

however here is a base guideline
http://witchhunter.com/injectorcalc1.php

 

[nallj92]

Re: Help with fuel injector selection

I also would look at the 60lb Semiens/Deka Mototron's There are mutiple deals on these around the web. You could also up it to the 80lb mototrons as well if you wanted to ever run E85.

I got mine here:

http://www.fullthrottlespeed.com/itemdesc.asp+ic+709FI114961+eq++Tp+

 

[Gnocide]

Re: Help with fuel injector selection

dont believe all the calculators like the one i have above
from kenne bell
ENGINE HP AND “ACTUAL” INJECTOR FLOW
We’re often asked:
“How come he can make more HP with 39# stock injectors than I can with 55's.?” “What fuel
pressure do I need?”“How much HP can I make with this injector?”
There are a lot of variables in making HP. Many aren’t understood or even considered in the
overall equation. We are fully aware of the confusion that exists about fuel systems as the basics
of flow and pressure are seldom understood.
Here’s a formula that we use to determine safe potential engine HP from ACTUAL INJECTOR
FLOW for a supercharged Ford V8 at a safe 11.5:1 Air/Fuel Ratio and 85% injector duty cycle:
(ACTUAL INJECTOR FLOW x .85 x 8 x 2) = ENGINE HP.
EXAMPLE: (38.5 (Cobra stock injector at 39 psi delta) x .85 x 8 x 2) = 523 ehp
ENGINE HP x CORRECTION FACTOR (DYNOJET) = rwhp
EXAMPLE: 523 x .86 = 450 rwhp
It’s IMPORTANT to remember this is a guide for delivering 11.5:1 all the way to redline AND it
is based on 39 delta psi. Anyone with the knowledge and right software / hardware can make
more HP with this same injector if a) you raise the delta psi, and/or b) extend the duty cycle
and/or c) run the engine leaner. 10% leaner from 11.5 to 12.65 = 10% less fuel used to make the
same hp - or 10% more fuel to make 10% more hp. At 650 hp using the 10% savings in A/F
Ratio can make as much as 65 MORE HP, or 705 hp with the same amount of fuel.

 

[leadfoot]

Re: Help with fuel injector selection

450-500hp engine build. Using SyTy intake manifold and fuel rails. Adjustable regulator. What injectors do you guys recommend and who sells them?

Thanks!

It can't get easier than this: :tup:

http://www.gtsparkplugs.com/InjectorSizeCalc.html

 

[BMFB]

Re: Help with fuel injector selection

buy the biggest injectors you can and never look back

 

[Throws]

Re: Help with fuel injector selection

It can't get easier than this: :tup:

http://www.gtsparkplugs.com/InjectorSizeCalc.html

Bookmarked! Thanks! :tup:

-P

 

[Aeroking]

Re: Help with fuel injector selection

i bought my 65s through PTE.

Their chart shows.

are you looking for 500 at the crank, or at the wheels. Figure 25% drivetrain loss.

 

[skwayb]

Re: Help with fuel injector selection

Ahem - http://www.racetronix.biz/itemdesc.asp?ic=FI114961&eq=&Tp=

Hood, which 80lb High Z injectors do we use?

 

[sytyguy]

Re: Help with fuel injector selection

Hood, which 80lb High Z injectors do we use?

D4 Motron IIRC - http://www.racetronix.biz/itemdesc.asp?ic=FI114992&eq=&Tp=

Connector and body length look right, but I have the PN at work to verify.

 

[Damian]

Re: Help with fuel injector selection

So the 50lb injectors are good for 564hp then going by that chart?

 

[sytyguy]

Re: Help with fuel injector selection

So the 50lb injectors are good for 564hp then going by that chart?

That 94hp per injector is ambitious (read unrealistic) IMO. The BSFC calculator comes out at 80hp per injector (480hp total), which I feel is closer. The sad truth with most of our trucks is that the tune or combo is so far off that the injector gets the blame for fueling inadequacies. In a properly tuned/built truck, 480hp (and 500+ for that matter) is achievable with 50s. I just don't like the inconsistency of the Delphi 50s. I've tuned over 20 trucks with them (including my own) and no truck has fueled like any other, they all have idle inconsistencies, and have non-linear flow vs fp. 60s/63s are FAR superior IMO.

 

[dgoodhue]

Re: Help with fuel injector selection

480hp (and 500+ for that matter) is achievable with 50s.

Phillip Long had 50# injectors on his truck. His truck did 399 awhp on a dyno (about 500 crank hp). He said his injector duty cycle was 90%. Obviously you could do more hp but that is pushing. As Hood mentioned, I would (and did) use the 60/63 injectors because of ease of tuning.

 

[sytyguy]

Re: Help with fuel injector selection

Phillip Long had 50# injectors on his truck. His truck did 399 awhp on a dyno (about 500 crank hp). He said his injector duty cycle was 90%. Obviously you could do more hp but that is pushing. As Hood mentioned, I would (and did) use the 60/63 injectors because of ease of tuning.

My point exactly. Phil was one of us who could tune and was able to get much more out of his truck/build than most. His results with 50's were closer to the injector's calculated potential.