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Old 02-11-2009, 01:51 AM   #1
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Default JRSC boost dropped... timing problem?

when I first got this car it only put out about 4psi. after I upgraded the old style engine management to the newest powercard pro it cured my stalling problem and my boost went up to 5-6psi. however, I think this may have been from jiggling around the crappy wiring job the previous owner did with the JR timing box and now I think it may have shorted out again.
Today I got in my car to drive it around and noticed im back to 3-4psi...
Im thinking its got to be that timing box. anyone confirm that or have any other ideas? does timing effect boost?

thanks
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Old 02-11-2009, 02:50 AM   #2
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nevermind
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Old 02-11-2009, 08:50 PM   #3
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As far as I know, timing doesn't effect boost. You may have a leak in your line.
See the below photo. I found out that my the rubber coupling hose on to my gauge was all cracked and I had major boost leak. My gauge wasn't vacuuming and I was never able to hit over 3PSI.

I replaced it and now it's vacuuming -12 to -15psi and boosting about 4.5-5psi.

Hope that helps.

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Old 02-11-2009, 08:52 PM   #4
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wow
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Old 02-11-2009, 09:22 PM   #5
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hmm. I ripped out all the cilicon hoses this guy had in there and replaced them with new black rubber. I will check the conections again while im installing my coolant rerout and cops. thanks for the idea!
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Old 02-13-2009, 12:50 AM   #6
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make sure you have good hose clamps on the crossover tube, i "gained" 2 psi after i found out i could pull out the crossover tube with my hands because the clamps were garbage.
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Old 03-29-2009, 04:24 AM   #7
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just a little humorus update.
aparently at 3000 ft I lose 3 lbs of boost on this thing.
I only figured this out after dismantling my SC and intake mani and all my hoses... stupid altitude.
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Old 03-29-2009, 10:16 PM   #8
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Quote:
Originally Posted by cfdrifter View Post
just a little humorus update.
aparently at 3000 ft I lose 3 lbs of boost on this thing.
I only figured this out after dismantling my SC and intake mani and all my hoses... stupid altitude.
TOO FUNNY!!!! I wasn't happy the boost my jrsc m45 made w/big boost kit. I checked connections, clamps, ect and averaved 6.5-7# (maybe a little more on a COLD damp day). Then I too relized altitude!!!! This was only 3 days ago that I too, figured this out.

It should ROCK when I go to the beach in a month or so.

Just an addition. I just had the car dyno'ed (nearest shop is at the base of the mountain). Low and behold I picked up an extra # of boost. The m45 kicked the car up to 172 hp (not bad for the lil blower I thought).

Last edited by mountainmiata; 03-31-2009 at 02:54 PM. Reason: adding info
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Old 05-24-2009, 09:44 PM   #9
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That's not bad power for the JRSC!
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