that's why i chose the AI, the methanol and distilled water mix costs me about $3 per full tank of fuel to run which is much cheaper than race fuel and will also bring your EGTs down a few hundred degrees.

 

I think egts are still very important even with AI. Without it really you are just guessing what is going on with your ai system. One of the best ways to tune with ai is through egts. Without monitoring that your motor is only surviving on a prayer because your not exactly sure if you are injecting enough of whatever substance you are using to combat egts and iat. After all what is AI really for? if you get right down to it, it's to reduce egts and iats so why not use both of those tools to monitor what your ai system is doing?

 

what are you using to control it? I have a m5 noozle and thinking of putting it on throttlebody.

 

EGT gauges are great. It's the only way to really tune timing, get that nice lean cruise without melting the turbo, etc. A narrowband A/F and an EGT make a great tuning combination that doesn't cost a lot IF YOU KNOW HOW TO READ IT. And that last point is important because most here can't read EGTs so the wideband is far more convenient for them. And keep in mind that you might get 100 recommendations for something on this forum, but only 2% of those that are making the recommendation have actual experience....

 

My ears are red!

My Alkycontrol system hasn't failed at all. Infact, I peaked at 24.4psi of boost today on 93 octane and methanol as I was edging the leading spark advance forward a bit. Here's a link to the thread and the datalogs:

http://forum.teamfc3s.org/showpost.p...&postcount=258
http://forum.teamfc3s.org/showpost.p...&postcount=259

EGT's... this one's a difficult one. I think the single biggest problem with dealing in this EGT subject has to do with a lack of true reference or standard on where the probe is mounted. I have mine mounted in the downpipe about 3 to 3.5" past the turbo's v-band flange to the downpipe. Some people, however, mount them in the exhaust manifold. Surely, there will be a difference in temperature reading due to these varied locations as a result. Therefore, it strikes me that it will be difficult to nail down what a truly "safe" EGT is under load -- perhaps we all should just mount them in the exhaust manifold and then go from there.

/Shrug

B

 

****lack of true reference or standard on where the probe is mounted**********

Yeah. Exactly.

 

^^ as far as alcohol systems, I'm not saying there aren't reliable systems out there. I'm saying that I'm a dumbass who will probably find a way to screw it up anyway.

 

there is no exact science to how hot is too hot for EGTs, it does depend on the location of the probe but there is also going to be people comparing their readings to those of someone on opposite poles as far as ambient conditions go. you can't compare an EGT from your engine at 110F ambient temp and beating the crap out of the car on the track vs someone cruising down the highway for one spirited boost run on a 40*F ambient temp day. EGTs will range even on the same car and tuning is a little tricky with them, you have to make some real changes to timing to notice the change and how is it to say the car, oil cooler, cooling system and IC core aren't heat soaking and you aren't pushing things too far or not far enough? all you can really aim for is to keep them as low as possible but for a reference point, even one from your own car, well that just comes with time and experience in driving your car and becoming familiar with how it reacts to different situations.