[cdstalon]

Actually it's the retarded timing that lets you see really hot EGTs. What happens is that the ignition occurs so late in the process that all the hot air just immediately leaves, and blows right on your temp probe.

 

[16g-95GSX]

Cdstalon is right about the timing thing, the later the ignition occurs the hotter the gases will be as they come out. Now here is a question for everyone to add in with their input. Is Cazzo right about the temperature thing? Just curious, as if he is and I have been tuning for 50* less temps this whole time, then I can lean her out quite a bit and gain quite alot more power.

 

[awdboost]

Quote from RRE on Hi tuning and EGT

"The higher rpm ranges on the AFC are probably the easiest to tune (if you have an EGT). Use 3rd & 4th gear and go for long runs & watch your EGTs... If the temp gets over 900 Celsius in third gear, you are too lean. We've found that above 5,000 rpm, the settings are typically set very similar to each other."

I thing it more how long your on the 900 and up mark that will alow you to melt pistons. not what you hit. 850 is a safe mark but too rich still. I've alway like staying on the safe side and away from 900 but I do hit it once in a while, but am not on it that long.

 

[16g-95GSX]

O yea I definately won't go over 900 if that can cause problems, but someone once had told me not to tune for JUST below 900 so I have kept it simple. Damn, perhaps I have more to pull out of her still. Awesome

 

[Cazzo]

Actually it's the retarded timing that lets you see really hot EGTs. What happens is that the ignition occurs so late in the process that all the hot air just immediately leaves, and blows right on your temp probe.

Exactly, Too lean (retarded timing) makes you hot, obviously, but too rich (advancing timing) does the same thing. There is that threshold between the two, which for me isnt at 900, but more. I still tune for 900 though, even though I know there is more power in there. You aren't cruising at 900 anyway, which is why 950 doesnt do immediate damage either. I would turn up the boost, but I'm not too sure how much more the stock gaskets and studs on my car will handle, and I am not willing to find out the hard way.

AS for the quote from RRE, guess who tunes my car and gives me information that I sometimes write? They put that on their website so that you can make "safe" power and keep them out of court. Being safe means being conservative, and conservation is not the same as being optimized nor efficient. But as I said in my last post, don't go out and tune for 950 just to see what happens, because nothing will. Keep tuning at 800-850 where nothing will definately happen and your car will be "safe".

 

[awdboost]

Exactly, Too lean (retarded timing) makes you hot, obviously, but too rich (advancing timing) does the same thing. There is that threshold between the two, which for me isnt at 900, but more. I still tune for 900 though, even though I know there is more power in there. You aren't cruising at 900 anyway, which is why 950 doesnt do immediate damage either. I would turn up the boost, but I'm not too sure how much more the stock gaskets and studs on my car will handle, and I am not willing to find out the hard way.

AS for the quote from RRE, guess who tunes my car and gives me information that I sometimes write? They put that on their website so that you can make "safe" power and keep them out of court. Being safe means being conservative, and conservation is not the same as being optimized nor efficient. But as I said in my last post, don't go out and tune for 950 just to see what happens, because nothing will. Keep tuning at 800-850 where nothing will definately happen and your car will be "safe".

but you can still tune for just under 900 and be fine.. in 3rd gear when you shift you egt go lower anyways. Also use of a pocket logger can help to see your timing geting pulled. It all good.

 

[Cazzo]

but you can still tune for just under 900 and be fine.. in 3rd gear when you shift you egt go lower anyways. Also use of a pocket logger can help to see your timing geting pulled. It all good.

I agree, anyone tuning for 900c on an upgraded turbo and fuel system should be using the proper tools.

Is that conversion of lb/min to HZ an actual conversion or did someone just do some basic algebra with no proof? It does seem pretty close though according to the numbers in this thread. It's just an approximation right?

 

[All_turbo16]

Is that conversion of lb/min to HZ an actual conversion or did someone just do some basic algebra with no proof?

Not sure actually. I wrote it down along time ago from a post in DSMtuning@yahoo groups. It works though so it's good for getting a good approximate number