Types of injectors for PE-LTD?

[ReadySetGo]

Just wondering what kind of injectors you guys are using with your F4i's? I know the stock injectors work, but how about RC injectors. I know it sounds kind of funny, but we are running RC injectors that are about 15lbh with high resistance and our start up pulse widths are about 10ms!! If we drop it down below 10 the car just doesnt want to start. I'm thinking it has to do with the RC injectors. We have played with the fuel pressure from 30psi to 60psi and it seems the lower pressure lets us bump the pulse widths down by almost 1 or 2 ms. This kinda sucks because we just rebuilt our waterbrake dyno and are itching to test it.

What do you guys think? Injectors or we are using the wrong hampsters to turn the crank?

[ReadySetGo]

Just wondering what kind of injectors you guys are using with your F4i's? I know the stock injectors work, but how about RC injectors. I know it sounds kind of funny, but we are running RC injectors that are about 15lbh with high resistance and our start up pulse widths are about 10ms!! If we drop it down below 10 the car just doesnt want to start. I'm thinking it has to do with the RC injectors. We have played with the fuel pressure from 30psi to 60psi and it seems the lower pressure lets us bump the pulse widths down by almost 1 or 2 ms. This kinda sucks because we just rebuilt our waterbrake dyno and are itching to test it.

What do you guys think? Injectors or we are using the wrong hampsters to turn the crank?

[BStoney]

Why did you choose to use the RC injectors over the Hondas?

[ReadySetGo]

because we already had a fuel rail and injector housings that fit RC injectors. I guess we could make some for the stock injectors really quick and see if that helps.

[BStoney]

I see. If you go that route..use the F4i fuel rail and have some parts machined for the bosses to accept those injectors. If you want to know further in terms of a drawing for this..contact me off the board.

[B Lewis @ PE Engine Management]

Hi Omar,

I spoke with Alexander (I think???) from your team last week and I suggested that your fuel pressure gage may be on the wrong side of the injectors (in other words measuring return pressure). You mentioned in your post that:

"We have played with the fuel pressure from 30psi to 60psi and it seems the lower pressure lets us bump the pulse widths down by almost 1 or 2 ms."

If you were actually reading the fuel pressure at the injector, lower pressure would mean that you would have to increase the open time to get the same flow, not reduce it as you have suggested. It sounds like you are adjusting the return pressure to be 30-60 psi rather than the supply pressure. If this is the case it makes sense that 60 psi on the return side would require very high pulsewidths becuase you are actually running very low supply pressure.

Please let me know what you discover. If it is not a case of the pressure gauge on the wrong side of the regulator, please let me know. If you need any other help please feel free to call.

[Cement Legs]

Hey Brian we have been looking into the pros and cons of your engine managemanet systems vs the Megasuirt II systems for a Honda F4i. The actual post is engine management. If you have time to read it over any ideas would be appreciated....

Sorry for the tangent http://fsae.com/groupee_common/emoticons/icon_biggrin.gif

[ReadySetGo]

http://fsae.com/groupee_common/emoticons/icon_rolleyes.gif http://fsae.com/groupee_common/emoticons/icon_redface.gif STUPID problem. Someone wired the tps power wire to the injectors. Man I should really pay attention to what the engine team is doing. Sigh, everything is gravy now. the injectors like seeing 12v instead of 5v. doh!

[osubeaver]

Wow, that is some bad wiring. You should keep an eye on whoever did that http://fsae.com/groupee_common/emoticons/icon_eek.gif. BTW, we have used RC injectors for a while now (195 cc/min this year) and they seem to work out fine except they are a bit spendy.

[B Lewis @ PE Engine Management]

Glad to see you got the problem sorted out. Thanks for the update.