Author Topic: MX-5 NC with RX-8 231 Engine  (Read 39763 times)

Offline Grant Monkhouse

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1170 on: July 24, 2020, 09:35:38 AM »
This just came to me

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Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1171 on: July 24, 2020, 11:40:57 AM »
The engine is bridge ported. Might be the problem

Offline Grant Monkhouse

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1172 on: July 24, 2020, 01:03:47 PM »
I think the bridge port/tertiary ports open up around 7500 rpm based on the rotation of the sleeve.

That's what my bridge ported rx8 did. All on a stick ecu

The more you drive it the better the ecu compensates for the added air flow, its a smart ecu for what it is.

The problem is if you are watching the gauges all the time you are going to see things.

Best solution is to get rid of the gauge

Get some serious miles on the car and you will find that it goes away

With my bridged rx8 the "feel" of the engine power got better the more I ran it, possibly due to the engine bedding in and compression going up, but the transition of air and fuel delivery improved.

Best thing about it was that when the tertiary ports open you could feel the extra power come in and take you up to 9500 rpm without the power really dropping off

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Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1173 on: August 06, 2020, 11:29:55 PM »
So I swapped the exhaust manifold, same problem.
Played about with the maf curve and it was better.
I've hooked up a temp pressure gauge to monitor fuel pressure.

Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1174 on: August 13, 2020, 07:12:23 PM »
I have found the air leak..... Eureka

Offline Jamie R

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1175 on: August 13, 2020, 07:21:59 PM »
Go on ?


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Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1176 on: August 13, 2020, 08:17:34 PM »

Offline Jamie R

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1177 on: August 13, 2020, 08:31:18 PM »
Nice one bud


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Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1178 on: August 13, 2020, 08:55:16 PM »
Need to catch up on your build thread later

Offline Jamie R

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1179 on: August 13, 2020, 10:26:31 PM »
Need to catch up on your build thread later
No rush it’s just filler n grp, same old same old


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Offline Mr Spiller

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1180 on: August 14, 2020, 12:21:21 PM »
Happy days


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Offline Casey

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1181 on: August 14, 2020, 06:25:21 PM »
Nice detective work Paul  :sign0098:
RX-8 230 Bridgeported: Racing Brake Disks & 4 pot front calipers,Full Racing Beat (RB) SS Exhaust system,RB ARB's F & R,RB REVI intake,Tein MonoFlex Coilovers & front strut brace.
RX-7, KIMI 1, 1st Gen S2, Silver,1983 - SORN
RX-7, KIMI 2,^^Ditto - now sold
RX-7, KIMI 3, 1st Gen S3, Red,1984

Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1182 on: August 15, 2020, 09:29:49 PM »
Hmm

Offline Grant Monkhouse

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1183 on: August 16, 2020, 12:19:08 AM »
At a guess I'd say they're brokened

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Offline Casey

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Re: MX-5 NC with RX-8 231 Engine
« Reply #1184 on: August 16, 2020, 11:26:44 AM »
Those could be a problem  ;)
RX-8 230 Bridgeported: Racing Brake Disks & 4 pot front calipers,Full Racing Beat (RB) SS Exhaust system,RB ARB's F & R,RB REVI intake,Tein MonoFlex Coilovers & front strut brace.
RX-7, KIMI 1, 1st Gen S2, Silver,1983 - SORN
RX-7, KIMI 2,^^Ditto - now sold
RX-7, KIMI 3, 1st Gen S3, Red,1984