I'm sorry- after wade said he wouldnt' worry about 100 percent duty cycles i stopped reading.

The previous bullets i all agree with.

 

I don't think this is the smartest way to build a fuel system, however, I have been running a Cartech RRFPR with stock injectors to support a TO4E stock ported mortor @ 13-14 psi. Wide band tested 11.7 to 1, augmented with water injection. I do push the injectors to the mid 90's, 2 1/2 years later, so far so good...

 

I've got an SR RRFPR for sale if anyone wants to play with it:
http://maxcooper.com/rx7/forsale/5/index.html

I has been for sale for a long time. I will reduce the price to $20 + shipping if anyone wants it. I just want to get rid of it, since I don't use it anymore.

-Max

 

Great Deal!

 

I agree that this isn't an ideal way to go, When you go static, the only way to control afr is with fuel pressure. For drag racing or occasional short blasts this might be OK with an FD. If you are on the road course or for long pulls on open road, probably not a good way to go.

Keep duty cycles below 85% and use a good fuel controller.

 

I agree

 

Just a fyi

I took the car to 1/4mil and got a 12.88 with 2.02 60ft and 110mph @ 1 bar with stock injectors.

 

A couple of things:

Injectors won't over heat with high duty cycles since more fuel is flowing thru them and at the same time cooling the coil windings.

There can be a problem with very high duty cycles and high RPM's. It is possible to have an injectors "hang" somewhere between full open and closed. This is due to the finite amount of time it takes for an injector to open and close. I have witnessed this on the flow bench.

In most all cases the 85% rule is too conservative, but it is only a guideline.

Gordon
WitchHunter Performance