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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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04-01-2008, 07:47 PM
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#1 |
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Victory Is Mine
Join Date: Feb 2008
Location: Suwanee GA
Posts: 428
Rep Power: 18  |
Ported engine normal to have a rough idle?
Im just checking if its pretty common for the idle to be kinda rough like its got a cam if it was a piston engine. Its consistant just kinda lopey. Ive got it at like 1100rpm right now. Its rich as hell also. Still trying to see how to tune for the 1300cc secondaries without my datalogit which ill have back this weekend.
l8r Jeremy
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 www.dealsgaprotaryrally.com 1994 Rx7 White 2001 RZ GT35R'd 1972 Rx2 Orange Coupe 5spd 2006 STi 1986 Buick GN |
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04-01-2008, 08:04 PM
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#2 |
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Rotary Fanatic
Join Date: Feb 2008
Location: Smyrna, TN, USA
Posts: 239
Rep Power: 18 |
To some degree, just depends on how much overlap there is in the ports.
Dan
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 93 RX7 BB (Race Car) 93 RX7 SSM (Soon to be IBM and a daily driver) 05 Silverado Z71 08 Mini Cooper 80 LS RX7 (for sale) |
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04-02-2008, 01:24 AM
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#3 |
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Rotary Fan in Training
Join Date: Feb 2008
Posts: 45
Rep Power: 0 |
I have 850 primary and 1300 secondaries with a very good idle on my large street port with a pretty good amount of overlap. Something else is going on with yours.
Just change the injector size to 1300 on the commander, for the secondaries that will automatically adjust the duty cycle to compensate. |
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04-02-2008, 08:07 AM
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#4 |
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Rotary Fanatic
Join Date: Feb 2008
Location: B'ham, AL
Posts: 329
Rep Power: 18 |
1300sec. don't effect idle at all. If it's idling super rich that can cause it some. Mine use to idle perfect til I but 850prim. in and now it lopes some(probably cause it misses) and actually pulls a lower vaccum. Just mess around with the idle fuel and timing with the commander. It's only a few cells.
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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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04-02-2008, 12:04 PM
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#5 |
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Victory Is Mine
Join Date: Feb 2008
Location: Suwanee GA
Posts: 428
Rep Power: 18 |
huh looks like I just need to figure out the idle fuel and timing then for idle. Tuning anything in the PFC is all new to me.
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www.dealsgaprotaryrally.com 1994 Rx7 White 2001 RZ GT35R'd 1972 Rx2 Orange Coupe 5spd 2006 STi 1986 Buick GN |
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04-02-2008, 01:40 PM
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#6 | ||
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Rotary Fanatic
Join Date: Mar 2008
Location: Rockville MD
Posts: 456
Rep Power: 18 |
You should get Chuck Westbrook's notes if you haven't already very helpful.
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93 Frozen Grey Metallic FD Build thread here 17 Camaro SS 1LE 04 RX-8 GT Quote:
Quote:
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04-02-2008, 03:12 PM
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#7 |
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RCC Addict
Join Date: Feb 2008
Location: VA
Posts: 1,812
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And where would one find the chuck westbrooks notes?
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04-02-2008, 03:28 PM
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#8 |
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Rotary Fanatic
Join Date: Feb 2008
Location: Smyrna, TN, USA
Posts: 239
Rep Power: 18 |
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93 RX7 BB (Race Car) 93 RX7 SSM (Soon to be IBM and a daily driver) 05 Silverado Z71 08 Mini Cooper 80 LS RX7 (for sale) |
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04-03-2008, 01:17 AM
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#9 |
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RCC Contributor
Join Date: Jan 2008
Posts: 713
Rep Power: 18 |
If you are still running the 550cc primaries the stock base map should not have the car running rich at idle at all.
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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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04-03-2008, 08:31 AM
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#10 |
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Founder/Administrator/Internet Pitbull :)
Join Date: Jan 2008
Posts: 644
Rep Power: 10 |
Also check for vacuum leaks.. If you have a vacuum leak somewhere, it could also cause your idle to be rough.
Are all the o rings around the injectors new? Can you hear any high pitch noise? Also, make sure your wires are not crossed
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 DGRR 2013 - Year of 13B www.DealsGapRotaryRally.com http://www.facebook.com/Herblenny |
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04-03-2008, 04:45 PM
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#11 |
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Victory Is Mine
Join Date: Feb 2008
Location: Suwanee GA
Posts: 428
Rep Power: 18 |
huh, I need to check a few things but im pretty sure everything is good. Yeah all new O-Rings on the injectors. I did just notice that the hose/pipe that comes out the back of the manifold for the cat isnt blocked off. Should it be if I got rid of everything under the manifold?
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www.dealsgaprotaryrally.com 1994 Rx7 White 2001 RZ GT35R'd 1972 Rx2 Orange Coupe 5spd 2006 STi 1986 Buick GN |
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04-03-2008, 04:50 PM
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#12 |
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Rotary Fanatic
Join Date: Feb 2008
Location: B'ham, AL
Posts: 329
Rep Power: 18 |
There is a hose/pipe on the back of the manifold that doesn't need blocked, that may be it. Actually I'm pretty sure that's it.
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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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04-03-2008, 11:38 PM
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#13 |
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The Judge
Join Date: Feb 2008
Posts: 196
Rep Power: 18 |
I have done the Mazdatrix (RB) mild and PineApple medium ports to engines, and they idle smooth with no sign of loping.
If you turn off the normal idle control system and manually tune idle timing and fuel, you can not only achieve a smoother idle but also leaner. That will be in the range of about 12 degrees IGL idle timing instead of the patheic retarded values that Mazda uses for emmisions control. Last edited by cewrx7r1; 04-07-2008 at 05:26 PM. |
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