Most liked posts in thread: ECT and IATs at the track

why do you think we run methanol?

 

Data analysis! Fun!

The first thing I'd want to overlay is a speed graph. This will allow you to "normalize" the IAT's relative to what you're doing on track. Were you getting faster as the session progressed? Were you stuck in a train for part of the run?

Also, we really need to know the hysteresis and resolution of the stock sensor to interpret this properly. One key thing I've learned is that the stock sensors are very purpose-selected (i.e. limited ranges, built-in smoothing, etc.).

I'd suggest doing the same kind of logging on-street to better understand the overall behavior of the system.

And I'll see if I can dig up some of my old logging data with my top-mount GRS to compare this to....


My 2c

 

Just common sense that when your sitting still with the motor running and no airflow through the IC that IT's will rise as heat builds and the IC gets hotter. Same sort of thing happens when tracking, as the under hood temps grow the IC get's hotter as do the inlet temps. At least I haven't found any easily availabe IC solutions that make a signifigant difference over stock so the use of meth injection seems to be the best answer for the track to cool the air. Using Meth to do this is nothing new, it was first used to cool the temps in WW2 fighter aircraft when they didn't have at the time ICs for the turbocharged engines......


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FWIW, I run a meth setup (not RMW- though I love theirs!) and spray just a bit for cooling... and it makes a HUGE difference on IATs. I haven't logged at the track - but watch the scangauge carefully. While I see temps similar to what you logged with the meth turned off at the track, I see max temps of 100-110-120 F with the meth on, spraying with the smallest nozzle, progressively from about 7psi-12psi boost, then wide open above that. While the injector pulse controlled systems (like RMW's) are more controllable (and tunable), for cooling, a little bit of meth can do a lot....

On the street, when the meth kicks in, IATs drop below ambient temps... It's like driving in winter ambient temps all year round...

 

I'm boarderline surprised your ECT's stayed around 200. Mine is very close to the edge of it's cooling capacity. Any hint of draft and she'll start to climb which says to me it's running at the max of it's capacity. I haven't data logged it yet (which I should, but I'm kinda afraid to see it).
Your making no HP with the IAT's that high.

 

Of note: I never had a cooling issue when running the Alcohol injection. I'm not sure how it relates but cooling the intake charge cooled the whole motor is my assumption.

 

I spray what I suspect is a tiny amount of meth compared to what Jan uses with his system. It's almost entirely for cooling. I'm not tuned for it - and doubt I'm spraying enough to have a significant impact on either octane or fueling (though I haven't logged sufficient AFR data to confirm that). It's primarily intended as a slight performance enhancer and additional margin of safety when hammering the car. Because I'm not tuning to assume the presence of meth, i don't need failsafes and don't have to worry about killing the engine if I run out of meth or if the system fails.

The progressive boost-controlled system I'm using is OK for this application (cooling, no meth-specific tune) - but is NOT the way to go if you want to tune for it, because it doesn't provide anywhere near the controllability of the RMW-style injector duty cycle based system with high speed valve, etc. So it's all a matter of what you want to get out of it. If you want your car to run like Ian's did last year... then you need Ian behind the wheel :lol: as well as an RMW-type setup and an appropriate tune.

 

we do.........but then I would have to kill you:aureola:

 

you have to understand 1 simple thing...........

I have spent time and money developing a system that works better than the competitions.......showing them exactly how to do it isn't going to happen. We can all sit here and read about how my car made 10whp etc over and over with their meth kit but they have no track data. Big difference but as usual the devil is in the details.

btw.......if you want to see it in action.......come to Sebring......bring your camera and umbrella..........

 

FYI I was planning on contributing some more data/info to this thread, but I've been overloaded at work. I'll try to send it this weekend.

IMHO I think a little more analysis/evaluation of the problem is in order before jumping to a particular solution. Yes, Meth definitely helps cool down whatever's there...but at the cost of considerable additional complexity.

I cannot over-emphasize enough how important the K.I.S.S. Engineering principle is...and I say this from *extensive* personal experience :crazy:

Besides, if you do cool things down a bit without the Meth, think how much better it'll be with it!

My 2c

 

Might want set the camera for high-speed, cause it ain't going to be in front of ya long!! LOL

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