I just bought my car about a week ago, its a 96 GSR with JRSC running 11psi. It uses the CRV pulley?

Anyhow everything has been great up till yesterday when I'm driving along and I get into it and all of a sudden I get to about 6k and the car pulls back drastically, felt like some major detonation and I looked at my boost gauge to see 15psi.

So I'm at a loss here because I do not see how its possible for a supercharger to all of a sudden start making more boost then its supposed to. My one friend say last time he saw that was due to the engine being blown so we did a compression check and everything came back fine.

What happens is you'll be driving around like say I take off in first, shift into 2nd and floor it it goes up to 11lbs almost instantly and then it sounds like some scuffing kind of noise and the boost gauge jumps to 15lbs and then the car pulls back and the boost gauge drops again to 11lbs.

I need help, anyone have any idea whats wrong and how I can get the boost back to a steady 11lbs?

 

Also this only happens at wide open throttle. When I'm partial the boost only goes up to about 11psi and the car runs fine.

Its almost like I'm spinning the pulleys faster then before but only sometimes?

 

what other pulley are you running ?

i have the same setup, im running crv pulley plus alternator upgraded pulley, netting me 16 psi at WOT.

 

I honeslty don't have the faintest clue. I just bought the car with this setup and don't know much about it. All I was told is that its got a CRV crank pulley.

I know the pulley on the JRSC is still the same, the seal is still on it.

 

no , you have to ask the guy you bought the car from whether or not he was running the "alternator stepper pulley " along with teh CRV pulley.
heres the rundown basically :

stock pulley setup = 6 psi
alternator stepper pulley changed = 12 psi
alternator stepper pulley + CRV pulley = 16 psi

i don't think you can hit 15-16 psi with just the CRV pulley. Unless the charger pulley has been changed to a smaller one also.

 

I'll have to check but when I purchased the car the guy said he had the boost upgrade from Jackson but I can see the pulley on the blower has not been changed. He told me that the car was running 10lbs.

What doesn't make sense is why this happened all of a sudden. I mean I've been getting on it ALOT since I bought the car and its been running a steady 10-11lbs and all of a sudden yesterday after we did the new rotors/pads the blower just decides to jump up to 15lbs. It only does it for a split second though and its not like instant like its supposed to run 15. It gets to 11 and then about 2-3 seconds later it jumps straight to 15 and then backs down.

 

check the relief valve on the blower inlet, make sure it's not stickin'
this shouldnt produce 15 psi anyways.
the only thing i can think of is the pulleys or your boost gauge hose, check for kinks etc...

 

someone else mentioned that maybe the belt is to tight? Said something about if the top belt is tight and the bottom is lose or something this could happen?

If it was the pulleys what could be the problem with the pulley?

 

the only thing that could be wrong with the pullies, would be if you had 2 or more pulleys changed out from the JR stock setup. The belt tightness can also affect the boost, but you don't want the belts too loose either, or they'll slip off, but you also don't want them too tight, could be the problem. You should be able to feel a little flex in the belt as you push on it . If it seems too tightn have someone loosen it, its esay, 10 minutes to do .

 

I'm hoping its just the belts being too tight. We just tightened them the other day because the boost dropped to 5-6lbs and I could hear the belts slipping.

 

yeah, the belt tightness can play a HUGH role in boost on these JR applications.
if it's too loose, low boost, too tight, possible high boost. Belts that are too tight, can also cause alot of other problems, BAD ALTERNATORS, BAD chargers seals, be careful, just loosen it all the way, then retighten them a little, test the car, and retighten them again if needed. Tightening them too much the first time will cause you a blown motor or burned up charger seal.
btw , heres my video of my charged, air to water intercooled Civic:

12 psi, crv pulley, alternator stepper pulley.
http://www.schybrid.neptune.com

 

yea I actually watched the video earlier. I love the cooler.

 

FYI, we found out what part of the problem was earlier today. The fuel cut like symptom was the car not engaging VTEC at 6k. I was low on oil so it was keeping the car from going into VTEC and then the s/c was trying to make up for that by boosting more.

We filled up with oil and that problem is fixed. The problem I'm having now is the charger is hitting a solid 12lbs of boost and the car has hesitation like detonation. I'm going to install my wideband so I can figure out whats going on.