Author Topic: MX-5 NC with RX-8 231 Engine  (Read 18891 times)

Offline boosted

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Re: MX-5 NC with RX-8 231 Engine
« Reply #960 on: September 30, 2019, 08:59:57 AM »
Been staring at the vac lines diagram are struggling to see where the positive pressure  can come from..
If you pull off the vac pipe feeding the vac chamber at the vac chamber should hear a psst noise as air rushes in equalise pressure. If no noise then there is a leak...are you sure the check valve is in the right way round? As vac opposite to what you think...flow from vac chamber to Uim.

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92 FD rx7 Twins 13.5psi. Track car
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Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #961 on: September 30, 2019, 05:08:44 PM »
Just a thought. Where is the vac sensor?! Or is this figure predicted by the ecu?

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Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #962 on: September 30, 2019, 05:10:01 PM »
Well done. the tail pipes are just right, any shorter and it would have droned in the cab. Racing Beat make three different length tail pipes because of this.

The SSV problem was a mechanical thing as the valve used to get carboned up, so I'm guessing you know that that's free to move OK   
SSV moved fine when I checked. The actuator took a lot more vacuum to move than the vdi actuator

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Re: MX-5 NC with RX-8 231 Engine
« Reply #963 on: September 30, 2019, 05:10:16 PM »
No vac sensor Paul...i was wondering how your monitoring this pressure in the vac chamber?

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92 FD rx7 Twins 13.5psi. Track car
94 Westfield Se 231 rx8 street port powered. Race car
EAT SLEEP ROTOR REPEAT.

Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #964 on: September 30, 2019, 05:11:59 PM »
No vac sensor Paul...i was wondering how your monitoring this pressure in the vac chamber?

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I was using torque Pro...

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Re: MX-5 NC with RX-8 231 Engine
« Reply #965 on: September 30, 2019, 06:54:00 PM »
Had no dealings with tech pro or mazda edit
..but there defo isnt a vac sensor...
If the vac chamber is holding vacuum when the car is off...then no leak.
I pulled the plug off and used 12v of the jump pack to fire my ssv with the stored vacuum.

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92 FD rx7 Twins 13.5psi. Track car
94 Westfield Se 231 rx8 street port powered. Race car
EAT SLEEP ROTOR REPEAT.

Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #966 on: September 30, 2019, 06:59:31 PM »
Must be theoretical pressure.

I checked all of the vac lines previously. All seemed OK... Definitely worse when hot. Need to double check connections

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Re: MX-5 NC with RX-8 231 Engine
« Reply #967 on: September 30, 2019, 07:09:35 PM »
Maf sensors calculations?..

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92 FD rx7 Twins 13.5psi. Track car
94 Westfield Se 231 rx8 street port powered. Race car
EAT SLEEP ROTOR REPEAT.

Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #968 on: September 30, 2019, 07:10:31 PM »
Maybe. Not thought of that.


*off to look at wiring diagram *
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Re: MX-5 NC with RX-8 231 Engine
« Reply #969 on: September 30, 2019, 07:39:22 PM »
Phil bate answered it. Calculated from engine load

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Re: MX-5 NC with RX-8 231 Engine
« Reply #970 on: September 30, 2019, 08:05:56 PM »
Ok...its gonna be something simple...just blimin finding it...

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92 FD rx7 Twins 13.5psi. Track car
94 Westfield Se 231 rx8 street port powered. Race car
EAT SLEEP ROTOR REPEAT.

Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #971 on: October 05, 2019, 03:30:41 PM »
I got a replacement SSV Actuator and vac lines from bigpete on rx8oc.
The old actuator was a bit slow to respond so see if that eliminates that issue. I've got a spare solenoid if not.

I'm trying to come up with a way of keeping a bit of heat away from the solenoids. I might make a heat deflector plate which will shield them from the direct engine heat.

The vac tank is holding pressure :)

The next thing I might look at is the breathing mod which will do away with the catch tank. The oil filler tower is directly linked to the inlet manifold bungs/nipples

Fitted a replacement rear o2 sensor, hopefully will fix the heater failure fault code.

I've raised the rear by 15mm so the exhaust doesn't scrape so bad

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« Last Edit: October 05, 2019, 03:33:02 PM by Paul_13 »

Offline Paul_13

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Re: MX-5 NC with RX-8 231 Engine
« Reply #972 on: October 08, 2019, 11:51:57 AM »
Next job. Oil pressure and temp

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Re: MX-5 NC with RX-8 231 Engine
« Reply #973 on: October 08, 2019, 08:10:53 PM »
Looks a nice bit of kit
Its just Rotors and GRP

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Re: MX-5 NC with RX-8 231 Engine
« Reply #974 on: October 08, 2019, 08:20:23 PM »
Cheap ass amazon crap :D

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