new - New Zealand MX-5 Forum

dscotland · Post by **dscotland** » Fri Aug 27, 2004 12:16 pm

Hi, finally managed to get on this list.
Got a 1990 MX5 with Jackson racing supercharger and can't get the thing to
idle. Also, it is running very rich and burning through the gas at an
alarming rate. Anyone got any ideas on how to fix, (without spending $$$
on an aftermarket computer)
Thanks,
Duncan

rotarypower · Post by **rotarypower** » Fri Aug 27, 2004 12:41 pm

ring rotarypower ltd 4435762 fitted quite a few regards glenn munro

dscotland@repco.co.nz wrote:

[...]

MX5PWR · Post by **MX5PWR** » Fri Aug 27, 2004 1:24 pm

Hi Duncan, welcome to the list. Where are you living?

Nigel

From: rotarypower <rotarypower@value.net.nz>
Date: 2004/08/27 Fri PM 12:41:07 GMT+12:00
To: MX5List <mx5list@mx5club.org.nz>
Subject: Re: Fw: new

ring rotarypower ltd 4435762 fitted quite a few regards glenn munro

dscotland@repco.co.nz wrote:

Hi, finally managed to get on this list.
Got a 1990 MX5 with Jackson racing supercharger and can't get the thing to
idle. Also, it is running very rich and burning through the gas at an
alarming rate. Anyone got any ideas on how to fix, (without spending $$$
on an aftermarket computer)
Thanks,
Duncan

ring rotarypower ltd 4435762 fitted quite a few regards glenn munro

dscotland@repco.co.nz wrote:

Hi, finally managed to get on this list.
Got a 1990 MX5 with Jackson racing supercharger and can't get the thing to
idle. Also, it is running very rich and burning through the gas at an
alarming rate. Anyone got any ideas on how to fix, (without spending $$$
on an aftermarket computer)
Thanks,
Duncan

dscotland · Post by **dscotland** » Fri Aug 27, 2004 1:36 pm

Pukekohe
|-----------------------------+-------------------------------------------|
| <nigel.e@xtra.co.nz> | |
| Sent by: | |
| e-admin@mx5club.org.nz | To|
| | MX5List |
| 27/08/2004 01:24 p.m. | <mx5list@mx5c|
| | lub.org.nz> |
| Please respond to | cc|
| MX5List<mx5list@mx5club| |
| .org.nz> | Subject|
| | Re: Re: Fw: |
| | new |
| | |
| | |
| | |
| | |
| | |
| | |
|-----------------------------+-------------------------------------------|

Hi Duncan, welcome to the list. Where are you living?

Nigel

From: rotarypower <rotarypower@value.net.nz>
Date: 2004/08/27 Fri PM 12:41:07 GMT+12:00
To: MX5List <mx5list@mx5club.org.nz>
Subject: Re: Fw: new

ring rotarypower ltd 4435762 fitted quite a few regards glenn munro

dscotland@repco.co.nz wrote:

Hi, finally managed to get on this list.
Got a 1990 MX5 with Jackson racing supercharger and can't get the thing to
idle. Also, it is running very rich and burning through the gas at an
alarming rate. Anyone got any ideas on how to fix, (without spending $$$
on an aftermarket computer)
Thanks,
Duncan

ring rotarypower ltd 4435762 fitted quite a few regards glenn munro

dscotland@repco.co.nz wrote:

Hi, finally managed to get on this list.
Got a 1990 MX5 with Jackson racing supercharger and can't get the thing to
idle. Also, it is running very rich and burning through the gas at an
alarming rate. Anyone got any ideas on how to fix, (without spending $$$
on an aftermarket computer)
Thanks,
Duncan

Lou Girardin · Post by **Lou Girardin** » Fri Aug 27, 2004 8:34 pm

Check the afpr settings. Should show 50 psi at idle.

Jeff · Post by **Jeff** » Sat Aug 28, 2004 1:31 am

I hear the JRSC uses the ol' "resistor trick" to fool the stock ECU into
thinking it's really cold, and dumping lots of fuel to compensate. That sort
of thing should only be going on under boost, not all the time ...?

If we fix it, do we score cool stuff from Repco's ??

SLYDIT · Post by **SLYDIT** » Sat Aug 28, 2004 9:01 am

Could just be a faulty Air flow meter, the plugs on
them have been known to cause problems especially when
so close to the enginge block as with the JRSC.
I thought the fuel pressure should be 50psi at idle
only when you pulled off the vaccum line to the
adjustable regulator??? should normally be 40ish when
idling.??
If your running rich then youve probably fouled your
plugs resulting in poor idle. I beleive the correct
plug for JRSC cars is an NGK bkr6e.which is one step
cooler than a stock plug.(please correct me if any
info isnt correct
Also some after market fuel pumps around can actually
overpower the stock fuel pressure regulator due to
massive fuel flow and the idle fuel pressure would shoot up around 50-to 55ps.
Once youve got it sorted get yourself a "BIPES TIMING
CONTROLLER" from the states. It allows timing
adjustment and has temperature compensation to prevent
detonation that can still occur even when the timing
has been backed of to 6*. theyre about US$200.

Fletch · Post by **Fletch** » Sat Aug 28, 2004 9:15 pm

The JRSC for 1.6 and 1.8 NA's uses an adjustable fuel pressure regulator...

The JRSC for NB's uses the resistor trick (they dont have a fuel-return loop
to the tank like earlier cars, and its far harder to control fuel pressure
in that sort of system).

Fletch.

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