I am planning to replace my RC 37 LPH injectors with RC 55 LPH injectors but I saw the Mototrons and Siemens injectors. Does anyone have any info on these (not Specs). I want to know how they have worked for you good or bad. Any issues or praise. Please let me know before I purchase R.C's. Thanks to all.

Fig

 

We use the 60# Mototron alot they are very easy to tune and handle big HP.

Nate

 

I have the 57 (or 55 depending how you spec them) Siemens in the car now and they work fine for me. Also had good luck with the Motoron 60s in other cars so pretty much whatever you get cheaper I would get

 

I agree, we use them alot as well with good results. Bob

 

Anyone else?

 

I sell a ton of em. I have them on my GTO and 93 Cobra as well.

 

I have the 55 Siemens and am about 93% or better at my top RPM.
Would the Mototron 60's give me the extra umph to take me into the 80~85% area, do you think?

What is the biggest hi-z injector out now?
I've heard the Mototron 60's tune easier than the Siemens 55's... is that true?

 

60 lb instead of 55 lb should bring you just at 85% instead of 93% duty cycle. Personaly I don't know bigger high impedance injectors than 60 lb.

But RC Eng seems to have some 750 cc/min (71 lb/hr) high impedance injectors, but I don't know if they are compatible with your application.

http://www.rceng.com/prices.htm

Which fuel pressure do you run ? Will it be possible to raise it ?

 

i have the moto 60#ers....they idle like stock on just a base tune.and the 60# rating is at 3 bar of fuel not 4 so theyre actually like 68#ers i think at our fuel pressure.theyre good to alot of horsepower.

 

Base pressure with vacuum line off RRR is 68~69. vaccum line goes on, it reads about 61~62. It rises 1# fuel/1# boost.

 

That sounds promising.

See my post above ... I feel I'm pushing it now. Any opinions?
Besides, I'm hearing the shortcoming of my Walbro's is that they don't flow well at higher pressures. I'm not sure how to compensate for that.

I think I need to see how MightyMouse plumbed his Tee and outlet from the Fuel Sender. I definitely have a bottleneck there. This big cube + supercharger is sucking down the fuel, but I think if I can get increased flow ... not neccesarily increased pressure, I may get the volume I need.

What do you think?

 

Also, I was one of the first in line to get the Siemens 55's when they came out ... I'm not positive they were flow-matched. If I got a set of Racetronix's flow-matched 60's, I'd feel a lot more comfortable. His wiring helped me get over my last fuel hurdle before I upped the boost.

I MAY go back to a larger pulley and take the boost back down. I hit 12~13 PSI in 1st, then 2nd, but when it goes to 3rd (most of the run down the track), the boost drops down to maybe 8. I don't think most of that is RPM related ... I think the belt (8-rib) is still slipping like mad. (No, more crank bolt back-outs, though. ) A bigger pulley will cut down on the power down low (where I'm having trouble hooking up anyway), and reduce my Octane requirement. But, I'm hoping the boost stays up (around 10, I guess), throughout the remainder of the run.

At 7~8 PSI with 6 rib, I ran 10.84 @ 125 MPH before I killed my transmission. She's been sitting up for over a year. I just got "tired-out" from all the issues .... especially the transmission and the cooling.)

 

I am running the tron 60lb injectors right now. Python (Venom) supposedly has created an 83lb high Z and a 96 high Z injector. There is a member here that bought the 96lb highZ ones and is about to test them out to see if it is for real. If that pans out then I'm going for the 83lb highZ injectors next.

 

Then I guess I should pla the waiting game right now, huh.

I think 83's would be just fine for me.
Is there a better/less expensive alternative for lo-Z injector solutions, now (as opposed to a year or two ago)?

 

The reason I ask; I understand lo-Z injectors tune a lot easier, relative to their fueling capability, right?