[s-cars] Octane and Unleaded Race Gas Article

[Joseph Pizzimenti]

Matt, et al,
While filling up in upstate CT where I couldn't find a
sunoco the weekend of the s fest, I put 93 in instead
of the usual sunoco 94.  Got some retarted timing that
I could actually feel as a result of the switch, but
car came back after 2 94 octane treatments.

hth,
Joe
--- Matt Russell <skippertgore at hotmail.com> wrote:
> Hi guys! hope you all had a nice weekend!
>
> Just to clarify, I DO get some ping but it's been
> rare.  I can count the
> number of times since the chip upgrade, but I've
> been pinging more lately
> due to heat soak, which (since the only thing
> different about my car in the
> last few weeks) I blame on the removal of the
> undertray.  Long story, but
> it's a blown hose that I've now borrowed and want
> fast access to if it goes
> again before Samco arrives... (thanks again Joe)
>
> Mine seems to be coming from part throttle to wot,
> usually in 2nd or third,
> from 3200 or so.  it pings briefly, and goes bye-bye
> (guessing here) because
> the ecu backs the timing back.
>
> I'd love to get to the bottom of this one.  I
> realize the MTM 1+ is
> aggressive, but I'm seriously considering trying
> some different gas.
>
> Great link on the article, BTW... I enjoyed that.
> Thanks to whoever posted.
> So... I know I saw something on this before, but..
> who has BTDT on toulene
> mixing? the article seems to "knock" (pun intended)
> this as not being very
> effective and costing more than race gas.
>
> Oh, and does the ECU "learn" and adapt the timing on
> an ongoing basis?
> anotherwords, it detects ping, backs off the timing,
> waits awhile, and
> gradually advances again tll the cycle repeats
> itself?
>
> Perhaps I'm being a bit paranoid.  I'm planning the
> air/fuel & boost gauge
> (seperate post to come) install because I'm curious
> to moniter this a bit
> more accurately.  Me, I get a bit concerned about
> any ping, so I'm trying to
> change my driving habits so it won't happen at all.
> But hey, why buy a chip
> upgrade if you're not going to utilize that extra hp
> and put up with a
> couple minor details?
>
> Hope this wasn't too rambly.  I do love my Sunoco 94
> though...
>
> -Matt, CT
> 92 s4 that's waiting for the next wacky Wednesday
> gas sale to get filled
> up...
>
> --__--__--
>
> Message: 1
> Igor,
> AFAIK, Matt Russell runs the MTM 1+ with 94 octane
> here in NY/CT with no problems.  Is Sunoco 94
> available down by you?  Another peculiar thing is
> that
> some MTM1+'s ping while others don't, while most
> seem
> to be running 93 octane. 
>
>
>
>
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