Anyone have any experience with this unit. Does it have adjustibility? Is it simliar to the vortech S-FMU? Thanks


[Modified by lshatchturbo, 10:45 PM 7/20/2002]

 

No, the rise rate is not adjustable. The rise rate is fixed at 5:1.

Sonny

 

Cool thanks for your help. I had a freind come to me with this question about his greddy kit. He currently upgraded to a 3" downpipe, cat and exhaust. He is running this Jackson Racing FMU, with the greddy 310cc injectors that come with the kit. He is not using the FCU that came with the greddy kit. Also, he is running the walbro 255lph high pressure pump and a VAFC. I swayed him to Hondata describing and showing the great gains everyone he has had with hondata. My question is, with this setup, what kind of boost levels can he run until he can get the hondata setup with the new injectors. His bottom end is pretty beefed up with JE 9.1 and pawter (think thats how you spell it) rods with a block guard. Just wanted to know everyones opinions.

 

I'm surprised your friend isn't running lean with the JR FMU and 310cc injectors. Most people who run that kit using an FMU use an 8:1 with 310cc injectors. Have you guys verified that the engine isn't running lean with that setup? I'd make sure of that before going too crazy with the boost.

Sonny

 

We drove from Orlando to gainesville, something like 115 miles or so, filled the tank up before we left, when we got home, it was gas light was. He is also shooting black smoke at of his exhaust. I didnt realize the jackson racing fmu is 5:1. Are they all like that or do they have different ones like the vortech.?

 

Every JR FMU I have seen has been 5:1 and the rise rate is fixed. One thing you can adjust on the JR FMU is the static fuel pressure (the fuel pressure at 0 psi of boost). If you set this artificially high (it's basically required with the JRSC to combat tip-in detonation), you'll get the fuel pressure you need at the cost of it being too high at lower boost levels.

It looks like this, right?



In this pic, it's at the top of picture...mounted to the firewall. It didn't take long for me to ditch it and go with Hondata.

Sonny

 

Yea right on the money. The silver one pictured in your pic. I am not to familiar with this unit.. so thanks for your help. I get what your saying about the static fuel pressure. Is that what the top screw on the FMU is for? To control static fuel pressure.