Is anyone running a boost a pump with a Radix? After talking to Magnacharger, C Motorsports, and some internet searcing, I'm thinking that the boost a pump might fix my high injector constant problem.

I have the 42 lb injectors and the Walbro pump included with the Radix and am seeing injector constants reaching 22.9 ms at 5700-6000 rpm as logged by HPT. I'm trying to command a 11.2-11.3 AFR. My wideband readings show me going leaner as the RPM's climb even though I have commanded more injector constant in PE mode. I believe that the situation is caused by the fuel pump dropping flow and/or pressure at the limit of my RPM band. I believe the boost-a-pump can correct or help this condition. Am I right?

I've been assured that the 42 lb injectors can carry my boost level (7.5 psi)but I think I may be close to the limit of either the injectors or the pump.

 

You can use a boost-a-pump. Give me a call, we have em. Good talkin to you this morning BTW.

 

Thanks, Brian, I know I need to solve this quickly because my new 2.9 pulley just arrived today

 

never did it occur to me to add a BAP to the GSS340, hmm, I wonder if that would truly extend the rwhp fueling capabilities?

 

I think the "use pump 'x' for 'z' amount of rwhp" can be misleading. I think my full time 4wd soaks up a bit more power and this is throwing the deal off. The walbro pump should be good for 600 flywheel hp or more.

 

are you seeing a drop in psi? what psi are you showing?

 

Don't know about a pressure drop for sure. I just highly suspect it. It's either the pump or the injectors and I can see the injectors hanging open for 22.9 ms so they are doing what they can. Based on the onversations on the phone today, I'm looking to the pump first. I wish I had fuel pressure guage to confirm.

 

it would be interesting to see if your fuel pressure drops at all.

 

Well, it's either the pump or the injectors. It's pretty simple. I don't think I have much room for growth with either. If the boost a pump alone don't fix it the boost a pump and 60 lb injectors will. I'll post the results.

 

My inline pump that came with my radix does fine for 541 ft/lb of torque with 12 lbs of boost...