I got an f1a to run on my 355 LT1, shooting for around 700rwhp through an m6 with meth. What injectors would you guys recommend? Would 60's be big enough?

 

60s should be plenty for that power level, especially with methanol.

 

Is there a preferred brand?

 

Motron/Siemens is what we sell and use in all builds making 500+HP

 

Ok, cool! What is the max hp you think they will support?

 

I maxed out a D1SC, 346cid, with motorons 60lbs @ 100 percent duty cycle @ 737rwhp... Just some food for thought... Thats on straight MS109 race fuel... Kp runs 83lbs, i believe, and had an identical setup to me...

Jay

 

That sounds like it would be cuttin it close. Whats the next size up after 60's that are good to use?

 

I have seen they have some 75#'s out, don't remember who has them but it is one of the sponsors here------>. I think that is the next size up

 

I saw Racetronix has some 79's but I havent heard any experiences with them?

 

yea that is true, I haven't heard anything about them either.

 

If your looking to stay high-Z then you can use the RC 75s, a bit pricey but they have lasted us to the 750-800rwhp range depending on base pressure.

 

im building a 370ci iron block and plan on maxing the little D1 out, should i consider bigger than 60#'s?? everyone else seems to think they would be sufficient?? just wanna make sure before i buy them

 

If you want to be on the safe side, the 75s would be fine, the 60s depending on heads and the cam , as well as max boost level, might come close to 100%dc

 

The 75 RC are a complete bitch to tune for idle. They are much nicer in the mid to upper RPM range once they start to flow good.

Keith

 

Linky for the RC75s:

http://www.exoticperformanceplus.com...html?item=1066

 

Thanks! Bob

 

I am having good luck with RC75's. Tuned up real smooth.

 

Im using RC 73lb.... At the time I bought them, it was the biggest they offered.
Im running 66psi base pressure. Mine does idle fine at the minute....but the Siemens injectors are far far better in terms of idle etc.

And TBH.....switching between the 2 running, and running a high base pressure. I dont honestly believe the RC's continue to flow as well as the Siemens for any given pressure.
The upgrade did help, but not as much as I had hoped.

Racetronix do a 79/80lb, but I dont think its worth the hassle for me to upgrade from what I have.
But if starting afresh, it could be a good place to start.

Ive also seen these online....and one person did tell me ages ago that they used them, but didnt get any more details on them.
Ive just emailed them myself now though to see if the ad is correct....
http://www.schimmelperformance.com/O...jector90lb.htm

 

Just got an email back....the Schimmels are indeed high impedance 90lbs.



mmm adds to shopping list...

 

It depends on the spray pattern and if they are drilled out injectors. If they are drilled you might run into some tuning issues.

For the money on the 75s, you might also consider a AEM injector driver and a set of 83s or 96s depending on power level.