Fuel intectors...

[MYSHO1]

What size are you turbo guys using? where did you find them? also will other styles work? mustangs?

 

[stevemainian]

Theyre using 42lbs i believe.

 

[Sho-Driver]

The size of the injector all depends on the amount of boost you want to run. I am running 44lbs injectors for 12lbs of boost. PanamaPat is running 48lbs injectors for 15lbs of boost. IIRC, Pat maxed out 36lbs injectors at 380whp at 4500 ft above sea level.

Many go with Accel injectors. Both Pat and I are using Accel injectors. The rails will have to be bored out to about 0.550" to accept the larger injectors. Also, the Bosche style pintle caps will have to be converted to the Denso style. Basically you take off the pintle cap.

 

[SHO_Diehard]

Sho-Driver, what A/F ratio and duty cycle are you guys shooting for? Is this running the standard SHO fuel pressure?

Thanks,
Milt

 

[1slickRED89]

i got my FMS 42lbers from this this just ask for him to put a set of six up for you BIN, should be around $260 (lowest price per injector i could find at the time). i reused the stock split pattern caps but the engine hasn't run yet so i can't say much about how well that works. 'people who know' say they it doesn't really make a diffrence what cap one uses, if any.

i got a 255lph hi-pressure pump from here the FPF018 kit. i may make a post on how to modify the fuel rails to eliminate the need for a remote FPR...if my idea works. good luck, Corey

 

[Sho-Driver]

Sho-Driver, what A/F ratio and duty cycle are you guys shooting for? Is this running the standard SHO fuel pressure?

Thanks,
Milt

For a boosted applications, 12:1 is safe in any case. As far as the duty cycle, you obviously do not want to max them out over their capability and you don't want too large of an injector. In general you try not to go over 80% of the injectors capabilities.

 

[munkee]

So to figure the size of injector you will need, use this calculation. Desired HP multiplied by the maximum load brake specific fuel consumption (.55 for a turbocharged engine) divided by the number of injectors. Then divide by .8 (80%). For 300 hp you would need a 34lb injector. (300x0.55=165/6=27.5/.8=34.4) You could probably get away with using a 28lb injector if you didn't plan on maxing out your injectors very often and for very long, but as a rule of thumb you should try and go one size bigger than you need for future improvement.

 

[MYSHO1]

I can get 36 pound ford injectors my friend had in his stang for $200, is that a good deal?

 

[Sho-Driver]

I cannot tell you whether or not that is a good deal as I have never looked into Ford injectors. However, I was able to buy brand new 44lbs Accel injectors for $260 shipped... They were also already converted for the SHO and were flow tested (the results were sent to me in an e-mail).

 

[SHO--ripper]

SHO-Driver I'm curious what do you mean they were converted for the SHO?

 

[Sho-Driver]

SHO-Driver I'm curious what do you mean they were converted for the SHO?

.........................

Also, the Bosche style pintle caps will have to be converted to the Denso style. Basically you take off the pintle cap.

 

[pj'l_master]

i wonder if this thread has anything to do with this...
http://www.shoforum.com/showthread.php?t=42930

lol...but these are all good questions considering i would like to get a turbo myself

 

[tripleblack90]

what about your guys fuel pumps, can you use just a bigger pump, or are the injectors a necessity?

 

[SuperchargedSHOguy]

definitly a bigger pump

 

[1slickRED89]

what about your guys fuel pumps, can you use just a bigger pump, or are the injectors a necessity?

it sounds like you asking if one can use a rising rate regulator and keep the stock injectors, and if the stock pump can deal with that. i think not, that kind of system might only be practical up to about 8 psi boost which would put your fuel pressure well over 80psi. that would take a more powerful pump than the stock one. look at the link for fuel pumps in my last post.

I think that jeremy prines old car (the turbo one) used to have a setup like that (rising rate regulator w/stock injectors) from my very fuzzy recollection. but in my opinion larger injectors (new, or atleast flow matched) along with a larger pump and the proper ECM tuning is better, it's the path to 15+ psi boost pressures and easy tuning, regardless of the kind of car. Corey

 

[tripleblack90]

any suggestions on the pump size, 190?, 255?, i am very serious about putting a turbo on my sho, i need to know how its done on shos, and yes, i would like to have more than 8 psi, ill buy the injectors too then

 

[panamanick]

More than 8 PSI, you will need a 255lph pump. To further that, you will need to get an aftermarket fuel pressure regulator. You can run the car with this until you have money for the injectors.

 

[Sho-Driver]

More than 8 PSI, you will need a 255lph pump. To further that, you will need to get an aftermarket fuel pressure regulator. You can run the car with this until you have money for the injectors.

 

[stevemainian]

Would you need to get lower compression pistons as well? The compression on the sho engine is somewhat high, id imagine that 9+ psi of boost with the stock pistons would cause a bang.

 

[Sho-Driver]

No, you do not have to get lower compression pistons. You WILL need intake charge cooling. Turbochargers and superchargers produce LOTS of heat. Heat is the biggest killer causing detonation. You can cool the intake charge with an intercooler, aftercooler, water injection, nitrous, etc... Lower compression is a great way to do this as well. Even with lower compression, intake charge cooling is a good idea.