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Old 06-12-2003, 03:16 PM   #1
Mancini
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Location: Pittsburgh, PA
Question How to tune?

I've read through the archives and searched for good ways to road tune RS-T's but haven't come up with much that I found to be extremely useful. Most of the posts end up reverting to "get a wideband."

I was hoping that there might be some suggestions for the best way to road tune and things we can do or use to help prevent problems when tuning doesn't go quite right (injectors, gauges, things like that). That's why I put this in AFI instead of Tuning, but mods feel free to move it.

So here's what I've been doing, feel free to critique and give some help. In my setup I have an SAFC2, ITC, RRFPR (not using anymore), and autometer fuel pressure, egt, o2, and boost gauges.

When I first started out I richened everything up to 15% with my SAFC2 for all the RPM points that would see boost at high throttle. This was way too rich for slightly less than 4psi I'm seeing at the manifold. I could tell this cause I'd be cruising on the highway around 3k in 5th and when I'd go to build boost my egt's would drop from ~1375 to ~1300.

Using either 4th or 5th gear, depending on the RPM range I would cruise till my EGT's stabilized then would step on it and build boost. I would drop out fuel if my EGT's were falling and did so until they stabilized. I would also keep an eye on a/f and it was well into rich.

So as of now I have my fueling set up so that EGT's no longer drop and never climb above 1400. I then started playing with timing a little bit. I had timing set for 2 degrees of retard after 2400 rpms. I dropped this to 1 degree and noticed no serious increases in EGT's, but left it alone after that. BTW I'm running 93 octane.


The main thing I've noticed besides more power and better fuel efficiency is that it still is a little slow on hot and humid days. We had a nice cold morning this past weekend and it was scary how hard it pulled. This makes me think I could still take some fuel out but I don't want to get ahead of myself.

Well thanks for reading, suggestions welcome and I'd love to read how other people have gone through tuning their rides.
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Old 06-12-2003, 04:17 PM   #2
BOY
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99 RS-T RIP
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You're in the same boat I am, lots of fuel and relatively low EGTs and decent A/F readings. I've run with and w/out timing retard and things still feel pretty good until 5th gear. You're on the right track, but also remember that low EGTs can be a sign of det... although I think you're fine. As for running better in cooler weather, welcome to owning a turbocharged car, the TMIC doesn't help matter much either.
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Old 06-12-2003, 05:19 PM   #3
Mancini
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Low EGT's can be a sign of det as well Hmm...the dentist suction tool sound of my wastegate dumping doesn't help all that much with listening either. Only saving grace is the knock count on the safc2. But I honestly was not aware that det could cause low EGT's...anyone care to explain?
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Old 06-12-2003, 05:33 PM   #4
Graham
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If your sitting around 1400 EGT wise, I think you are on the right track. Have you been looking at your 02 sensor at all? Not that it is going to give you a perfect measurement, but it will give you an idea of your rich/lean condition.

My car NEVER goes above 1470 degrees on my EGT gauge. Also, my car was dyno tuned using an A/F ratio pinpointed to 11.5:1, which is a good A/F ratio. So, if you can hit those EGT's, you might be pretty close to being perfect.


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Old 06-13-2003, 10:42 AM   #5
BOY
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mancini, I wasn't implying that you were having det... your EGTs are pretty good. What I was implying was don't get caught up in the idea that only high egts are an indication of det. High EGTs will cause det, low EGTs (I mean sudden drop, abnormally low readings, etc) are one indication that that cylinder/bank isn't firing correctly from det. Don't worry, I was when it was first explained to me.
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Old 06-13-2003, 11:16 AM   #6
Mancini
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Ah ok, makes more sense I guess. I just figured as long as I don't see any quick rises in EGT's I'd be fine, but it's more like as long as I don't see any very sudden changes I should be fine.

Graham, as for o2...its rich when I'm on boost and tends to get slightly more rich at higher rpms. I glace at it occasionally just to keep an eye on it, especially during transitions.

So how have you guys gone about tuning when your not on the dyno?
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Old 06-13-2003, 11:22 PM   #7
jdk
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From my experiences the egt wont show signs of detonation,1300-1650 wot, just rich-lean.Of coarse this is w/ A.Meter pyrometer 2" from #2. DET needs to be heard w/ all windows up, pinging.

Running too rich (also warming your car up for 5min a day) can form carbon deposits on the piston creating a couple tenths more compression(less advance ,more pinging). I noticed this w/ my car
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