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

bump

what gauge did you get? I have the top of the line autometer EGT gauge, and it is very accurate, but the lower priced ones are crap.

Ya I was wondering this too. I bought the GReddy elec. one and will be putting the probe the same place.

You should be looking for around 1500-1550 F at WOT.
It will be much more accurate than the LED show of the AM A/F meter.
Sean Cathcart

GReddy should read 780&#176C at WOT.



-Ted

Ok and I'm sorry if I sound stupid but what is where you definitely don't want it to get, like too lean?

Anything over 800&#176C under WOT!&nbsp The EGT's will sometimes over slightly over 800&#176C under steady state crusing - this is due to the ECU running in closed loop trying to keep stoic on the AFR's.&nbsp If you see it creeping upwards on WOT, lift off!&nbsp Otherwise, you don't want to see anything over 900&#176C - there's a reason why the GReddy "redlines" at 900&#176C! :eek:



-Ted

800C+=?farenheit?

800=1472 900=1650

I'd really get a wide band o2 for tuning...

What is the ideal A/F for a wideband?

820 was the number to watch for on an NA, correct?

Depends on where you place the EGT probe?



-Ted

right after the exhaust manifold where my exhaust starts and it's easier to drill in a probe.

Yeah, just about.&nbsp I'd try and shoot for 800&#176C first then start leaning out to see if it's safe...


-Ted

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?

I'd say it'll do 150 easy.&nbsp You talking stock exhaust manifold right?




-Ted

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.

So with the probe plumbed into my downpipe just after the flange, at full boost WOT, I should be looking for temps between 750 and 800, correct?

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).

Yes, there are differences between NA and turbo.

For one turbos run a little richer to ward of detonation.&nbsp I typically see 780&#176C on my GReddy in the turbo exhaust manifold BEFORE the turbo itself.&nbsp When I was running the GReddy EGT in the downpipe (Racing Beat 3"), it used to read 720&#176C at WOT.&nbsp A turbo AFR runs about 11.5:1 to 12.5:1 ratios.&nbsp 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.&nbsp Thus the lower EGT readings in the downpipe after the turbo.


-Ted