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| RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections. |
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| RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections. |
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04-16-2008, 12:55 PM
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#1 |
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The Newbie
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just installed MBC's, little concerned
So I added a set of MBC's per robrobinette.com I have been running 17-18 vac before I added them (I could only boost to 7psi of course) and after I added these, I have it at about 9 psi and the car is measuring 16/17 with a very rare dip to 15 if the idle drops a little. Car is still smooth and runs fantastic...just the haunting thoughts that I could have done something during my couple of boost pulls...any thoughts or am I just being a little too over concerned?
Trev
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2006 Porsche Cayenne Tiptronic S Silver *FOR SALE* 2002 Audi A6 4.2 Quattro 1994 RX7 Touring 5 Speed Black/Tan Leather *SOLD* 1993 RX7 Touring 5 Speed Silver/Red Leather *SOLD* 1987 Supra 1JZGTE 5 Speed Blue/Blue Leather *SOLD* |
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04-16-2008, 03:09 PM
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#2 |
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Rotary Fanatic
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this may not be the cause at all.. but any good MBC is vented, to prevent boost fluctuation. on mine, there was a small hole drilled into the part with the ball/spring. i'm thinking that the tiny bit of air sucked in through the vent is contributing to your drop in vacuum, and is totally normal.
if im wrong, my bad
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04-16-2008, 04:39 PM
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#3 |
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RCC Contributor
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I wouldnt worry, if it was blown you would know it. Could possibly be loosing a little vacuum where you added all the new lines also.
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David Jerome Broker for Speed For Sale LLC (David@SpeedForSale.com) (Pre-owned RX7/sports car sales & new parts sales/installs/tuning)  PM me about low priced, high quality port work 
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04-17-2008, 07:10 AM
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#4 |
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Rotary Fanatic
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^agreed, IMO vaccum is not a good indicator of engine health since their are so many things that can cause it change.
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1993 Rx-7 SM2 #11 At the local AutoX: http://www.youtube.com/watch?v=9VOSQkkSLQs Speed for Sale shootout 2007: http://www.youtube.com/watch?v=JiqlyAkGmpg A few laps at Barbers: http://www.youtube.com/watch?v=6_h5q...x=0&playnext=1 |
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04-20-2008, 10:31 AM
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#5 |
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The Newbie
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well,
I did swap out the boost control with a new ball bearing controller, but left the needle valve in charge of pre-spool. I am getting a 7-3-5 pattern now...guess I need to tweek it more...
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2006 Porsche Cayenne Tiptronic S Silver *FOR SALE* 2002 Audi A6 4.2 Quattro 1994 RX7 Touring 5 Speed Black/Tan Leather *SOLD* 1993 RX7 Touring 5 Speed Silver/Red Leather *SOLD* 1987 Supra 1JZGTE 5 Speed Blue/Blue Leather *SOLD* |
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