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jgrx7
Apprentece
USA
7 Posts |
 Posted - May 15 2007 : 9:18:50 PM
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Please respond even if you are not Aaron.
Aaron,
Information on your site is not only informative but well written, very appreciative. Here is my story; 88 TurboII rebuilt myself, fire, rebuilt, no longer daily driver, started it after periods of time, fuel leak, teardown, and now I am finding more fire damage.
The wire to the Air Control valve is crisp and detached. I now realize the fire from the fuel damper was not limited to the fuel rail area but swept around the intake manifold. I believe that the ACvalve is destroyed.
I could go to a junkyard or...block it off. Can I just block off the ACvalve or do I need to block off the numerous others as well? Secondly do you recommend blocking off the EGR system?
Thanks for your time,
Jason |
Edited by - jgrx7 on May 15 2007 9:27:05 PM |
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jgrx7
Apprentece
USA
7 Posts |
Posted - May 15 2007 : 9:25:37 PM
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The site that sells the kit is 2751engineering.com. It seems they have the kit for most RX-7s.
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - May 17 2007 : 09:26:25 AM
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If you are blocking off the ACV, you disable the emissions sytem entirely so you might as well go through with the entire emissions removal. You would need blockoff plates for the ACV and EGR. You should also have one for the cold start assist system (should be removed per Mazda TSB).
If you have a cat, you need to keep the ACV. |
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jgrx7
Apprentece
USA
7 Posts |
Posted - May 20 2007 : 07:43:25 AM
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I've decided to replace the valve if available. The junkyards need to come through or my garage this morning.
I read through many discussions on the RX-7 club page and decided not only did I find time laundered but only applicable to N/A within the i.e. actuators. I understand most of your experience comes from N/A not turbo. I allow for correction. I need advice.
I want my RX-7 TurboII to perform as it did, surpassing all vehicles in '88 besides the top three; Lamborgini, Porsche Turbo and another I cannot remember above the Porsche.
The entire Exhaust Recirculatory System does drag HP. Can I remove only part of it, or what parts are independent? If I remove the EGR system will this only harm emmissions but performance? My S4 turbo is not found within the fathoms of knowledge in the RX7Club without total time. I ask for your help.
Thanks,
Jason |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - May 21 2007 : 10:08:14 AM
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You'll want to get a junkyard or used ACV as the new ones are about $600.
The EGR system really has no effect on horsepower. In fact, as of '89 Mazda dumped the system since the rotary has so much natural EGR due to the overlap between intake and exhaust ports and the shape of the combustion chamber. I think they brought it back on the FD for one reason or another. |
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jgrx7
Apprentece
USA
7 Posts |
Posted - May 24 2007 : 02:02:55 AM
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I wondered about the fact why so much EGR is present when the Wankel breathes like a two-cycle. Appreciate the solidification. I suppose the Rennisis is EGR ridden with the way it maximizes ratios i.e. no rolling exhaust on the leading edge.
All of my parts are ordered/in and plan to start my RX this weekend (for the second time this year). My decision to not block off the EGR system was made mainly due to finding a spare ACV while cleaning the garage.
I have threes of so much c@)p; even on ebay I wonder if they have value.
The one thing I will be blocking off is the sub-zero start assist valve "thing;" courtesy of the previous mentioned website. Reading through the threads on RX7club lead me to the resolution. Your posts make complete sense.
Thanks again.
The air pump must rob some power? Is it possible due to the large pulley size it minimizes the impact? Honestly can't say I turned the pump fast enough to create pressure.
Lastly, do you have your EGR system intact? Why or why not, curious.
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jgrx7
Apprentece
USA
7 Posts |
Posted - May 24 2007 : 02:08:33 AM
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| Could you refer me to the Mazda technical service bulletin that implied required/recommeded removal of the start assist system? |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - May 24 2007 : 09:40:15 AM
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quote:
Originally posted by jgrx7
I wondered about the fact why so much EGR is present when the Wankel breathes like a two-cycle. Appreciate the solidification. I suppose the Rennisis is EGR ridden with the way it maximizes ratios i.e. no rolling exhaust on the leading edge.
Yes, I'm assuming the Renesis needs EGR due to the lack of overlap.
quote:
The one thing I will be blocking off is the sub-zero start assist valve "thing;" courtesy of the previous mentioned website. Reading through the threads on RX7club lead me to the resolution. Your posts make complete sense.
Could you refer me to the Mazda technical service bulletin that implied required/recommeded removal of the start assist system?
I think it might be TSB: # F00590 JUN 90 Sub Zero Starting Assist Device - Discontinued
quote:
The air pump must rob some power? Is it possible due to the large pulley size it minimizes the impact? Honestly can't say I turned the pump fast enough to create pressure.
The drag from the air pump is mimimal. Maybe 1-2 HP at the worst. It's a fairly free-wheeling device and doesn't create much pressure.
quote:
Lastly, do you have your EGR system intact? Why or why not, curious.
Nope. I run a full standalone EMS system and thus do not use any of the stock emissions controls. |
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Question: Block-off Plates TII
