Miata List Archive

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Mail From: rmcelwee (robert mcelwee)

I bought a 1991 with a JRSC (along with headers and full JR exhaust
including cat) for my wife. The car has some black soot on the tailpipe, the
idle gets a little low sometimes (to the point it stalls - probably just old
plug wires), and it doesn't feel like I am getting the full 60 hp increase
(compared to my other 1991 that is NA). Is there a place I can get Jackson
Racing documentation (scanned manuals, etc) on how to service it and tune it
up to get it working 100%. We just got back from a 19hr trip to pick up the
car and I really haven't started doing any research on it yet. I know that
the car has an MSD boost control and I have not adjusted it yet (it seems
like it is not adjusted properly - the 1st four leds light up all at one
time and then start backing down - you never see all 6 light). Also, what
octane gas do you guys run in your JRSC cars? Thanks for the help! (and
thanks for understanding that I have no idea what I am doing <G>)

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Mail From: keith (Keith Tanner)

>... and it doesn't feel like I am getting the full 60 hp increase
>(compared to my other 1991 that is NA).

A 1.6 6 psi JRSC will usually pull 120 rwhp on a dyno - a strong one that's
had a lot of work (and 8 psi) will make 140. A stock 1991 will get about
90. So a 30 hp gain is more what you should be expecting...

Keith

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Mail From: Bassmaster790 ((email redacted))

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Most 1.6 6psi JRSC dont dyno over 130 rwhp. I should feel like a good kick
in the pants.
1) check your timing. If the motor will tolerate it a bump up to 14 degrees
will make a difference.
2) New plugs,plug wires. My JRSC liked the Bosch Platinum Plus 4's.
3) I personally liked the J&S over the MSD..but Check with Scott at Roadster
Performace for MSD mods that seem to work very well.
4) Air/fuel ratio meter...are you running rich/lean may need simple AFPR
adjustments...may need high flow fuel pump..works wonders at 8psi.
5) Check out the miata net forum...tons of information on FI.

Charles Campbell
97 FM turbo 262 RWHP



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Mail From: Simknabpt ((email redacted))

Join the Sebring Super Charger Owners Registry (SSCOR) list. Everything you
ever wanted to know about the JR and more.

sebringmiata.com/page7.html

Stripey Si.