How low can you go?? (JRSC)

[Sonnyballs]

Hey guys,

How low are you able to set the atmosphere pressure with JR FMU? At 6psi on the stock injectors (~240cc), I'm guessing that I'll need to set the FMU at roughly 56 psi.

However, I may very soon install some 290cc injectors (~20% more flow). To compensate, I'll need to reduce the FMU pressure to about 45 psi. Is this gonna be doable?

I already have the AEM FPR to allow me to lower my idle pressure.

Sonny

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Sonny Van Hook ([email protected])
2000 Civic Si
1999 Tonykart/Honda 80cc Shifter

[5 Liter Eater]

What fuel pump do you have? Even w/ a big honkin' one I don't see a problem with the AEM.

[Sonnyballs]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by 5 Liter Eater:
What fuel pump do you have? Even w/ a big honkin' one I don't see a problem with the AEM. <HR></BLOCKQUOTE>

I have the Walbro GSS342. The AEM does not let me adjust fuel pressure at atmosphere (0 psi). The FMU has to do that. I need to know how low the FMU will let you go.

Thanks,
Sonny



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Sonny Van Hook ([email protected])
2000 Civic Si
1999 Tonykart/Honda 80cc Shifter

[Mr Rogers]

I think the closest any of us has ever gotten using the JR supplied POS was 40-45ish using the Vortech or B&M regulator.

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98 GS-scR w/ 11psi JRSC, Walbro HO fuel pump, AEM cai, Endyn Kamikazi header, Godspeed testpipe, Thermal Exhaust, Skunk Works cam gears, J&S Ultra safeguard v1, RC 370's, Cartech FMU, Vortech regulator, Apex-i
V-AFC, H&R sports and KYB AGX's,ITR LSD, JR flywheel, Clutch Specialties stage 4, MSD digital 6 & HVC coil, Endyn stepper pulley, NX nitrous and of course to slow down, KVR X-drill F&R rotors and Carbon Kevlar pads and V1 to signal the slowing down.
Best et ==&gt;13.6 @ 103mph w/ 2.3 60ft on Nitto drag radials @ 8psi of boost

[Sonnyballs]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Mr Rogers:
I think the closest any of us has ever gotten using the JR supplied POS was 40-45ish using the Vortech or B&M regulator.

<HR></BLOCKQUOTE>

Thanks, Javin!! That's exactly what I needed to know.

Sonny



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Sonny Van Hook ([email protected])
2000 Civic Si
1999 Tonykart/Honda 80cc Shifter

[Holden]

Tomorrow night I will be removing the OE FPR and replacing the injectors with Venom 320's.

I'll post how low the pressure will go with only a Cartech.

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Greg Holden
96 GSR, JSRC @6psi, AEM CAI/RSR 4-2-1/Greddy PE, Cartech 20005/Walbro GSS-342/TPS Mod, JR BTC, KYB AGX/H&R OE Sport/ST 19mm Rear Swaybar
Best 1/4 ==&gt; 13.937 @ 101.41mph
My JRSC Install Site

[Holden]

Actually, I just did it.

Here's some pics:






I only tested it at idle, no test drive. No leaks. Before, fuel pressure was 52psi idle, 64psi static. It's now 35psi idle, 55psi static.

Sounds like a safe place to start tuning from. I'll open the bleeder up a bunch tomorrow for a test drive.

I think a 25-85psi range will be good for 10psi. I'll work towards that.

I've lost my restrictor, so I'll likely be stuck rich until I get a replacement. (Paging Doctor Helbing...)

Rafe: If you're listening, what FP's are you at now? Thanks.

Greg

[blwncvc]

310 RC's no OEM regulator ... idle pressure is 25-30 ... WOT pressure is around 55-60 ...three green bars at WOT .. no tip in problem ... only running Cartech FPR

[Holden]

lostsol and blwncvc: What boost on what engine are you running?

Thanks,

Greg

[lostsol]

i have a b16 from a 99si and boost is about 9 psi. i also have the 342 pump and str fuel rail. i have not noticed any detonation with 13 degrees of timing. i alos have no a/c or p/s.

stacie