tuning with an egt guage Q's
04-18-02, 10:58 PM
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tuning with an egt guage Q's
I havent installed it yet, but will be putting a 1600 guaqge with the probe in the most upper part of the downpipe in my T2. What #'s should I be looking for (ie 2rich 2lean)? Also how accurate is this guage compared to my AM AF guage? Thanx guys
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04-19-02, 11:18 PM
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Anything over 800°C under WOT!  The EGT's will sometimes over slightly over 800°C under steady state crusing - this is due to the ECU running in closed loop trying to keep stoic on the AFR's.  If you see it creeping upwards on WOT, lift off!  Otherwise, you don't want to see anything over 900°C - there's a reason why the GReddy "redlines" at 900°C! 
-Ted
-Ted
04-20-02, 08:54 PM
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great, thanks!! also, assuming I'm running those EGT numbers, what kind of RWHP figures should my 88 NA put out with the following power mods?
-2.5 inch downpipe, mid pipe (no cats), 2.25 inch Y pipe w/ 2.5 inch Apexi mufflers, K&N, underdrive crank pulley, no ACV/Airpump, open 6 ports, RB aluminum flywheel w/ centerforce dual friction clutch, TB mod.
Would 150 @ the wheels be unreasonable?
-2.5 inch downpipe, mid pipe (no cats), 2.25 inch Y pipe w/ 2.5 inch Apexi mufflers, K&N, underdrive crank pulley, no ACV/Airpump, open 6 ports, RB aluminum flywheel w/ centerforce dual friction clutch, TB mod.
Would 150 @ the wheels be unreasonable?
04-21-02, 12:54 AM
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yea, stock manifold...headers on this setup I suspect would be WAY loud and the racepipe is supposed to give similar gains compared to a header from what I've read. I'd like to hit 14's before I have a motor built to handle a turbo and I wonder how far off I'd be.
04-21-02, 10:55 PM
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according to what RETed has said (and I trust him since I bet he's been asked MANY MANY times), I guess there is a slight difference between the TII and NA (NA can run a little leaner i gather) but seems like thats the ballpark. I'd try to run a little more rich in the turbo just because temps and elevations will effect boost without a good boost controller (i think).
04-22-02, 06:44 PM
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Yes, there are differences between NA and turbo.
For one turbos run a little richer to ward of detonation.  I typically see 780°C on my GReddy in the turbo exhaust manifold BEFORE the turbo itself.  When I was running the GReddy EGT in the downpipe (Racing Beat 3"), it used to read 720°C at WOT.  A turbo AFR runs about 11.5:1 to 12.5:1 ratios.  An NA can run leaner than that, so therefore the slightly elevated EGT's for an NA.
Second, the turbo uses some of the heat from the exhaust to work.  Thus the lower EGT readings in the downpipe after the turbo.
-Ted
For one turbos run a little richer to ward of detonation.  I typically see 780°C on my GReddy in the turbo exhaust manifold BEFORE the turbo itself.  When I was running the GReddy EGT in the downpipe (Racing Beat 3"), it used to read 720°C at WOT.  A turbo AFR runs about 11.5:1 to 12.5:1 ratios.  An NA can run leaner than that, so therefore the slightly elevated EGT's for an NA.
Second, the turbo uses some of the heat from the exhaust to work.  Thus the lower EGT readings in the downpipe after the turbo.
-Ted
Last edited by RETed; 04-22-02 at 06:49 PM.
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