Audiboy

Yesterday, Mike and I did a quick datalog of a few blocks. His car currently has a front mount so I told him I was curious to see how the new intake temps look like.

3rd gear, level road ~3000-6500 rpm runs

A combined chart of some essentials looks like this...
<img src="http://pictureposter.audiworld.com/9/a4_s3_dlog1.jpg">

I was quite impressed with the numbers - of course while trying not to puke as he accelerated back and forth hehe. Last time before we did a dyno day, I had recorded about 160-163F intake temps before the power cutout at 5252rpm (outdated software issue). He had the stock IC then.

So, I told Mike, I can estimate his boost and a few other things with the short datalog runs we did. Mike also has a Greddy TT with boost reading for reference. He peaked around 1.7bar somewhere even with a front mount!

Some quick manipulation after playing Gran Turismo - and I can't beat Mike on my own game damn! He doesn't even have a PS2 yet. Here's what an estimated boost looks like (note: right Y axis for units)
<img src="http://pictureposter.audiworld.com/9/a4_s3_dlog2.jpg">
Note, this is an estimate. This is not going to be close to real world because I am using a fixed value for air mass at 15C (59F). Nevertheless, based on a peak recorded boost reading, it's ok enough to go on.

Then, after further cranking - Mike I told you I can estimate intercooler efficiency
<img src="http://pictureposter.audiworld.com/9/a4_s3_dlog3.jpg">
Note - again, this is an estimate because of the air mass being constant, plus I didn't bother plugging in the different efficiency ratios of the turbo at a given pressure ratio. So, I just used 70% turbo efficiency. Plus, some other constants I just used.

Remember the 160-163F old number? Plug and chug gives me around 55-60% efficiency. Note to self - stock IC meant for stock boost of stock KO3. ;P Notice that efficiency goes down after time. Mike, fix this with a NOS intercooler mister he he.

By the way, I have a lot more charts including Mike's attempt to do a 0-60 run using the built in speed sensor (datablock 005). All I can say, for 91 octane gas, and if Mike knows how to shift under 1 second, with a slightly abusive (~4000 rpm launch), it's a 5 second car . Now with Mike launching at 2000 rpm, bogging it to about idle, then the slightly slipping clutch each time, and a 1+ second shift, we got 6.3 - not bad! Mike, I'll calculate your clutch slippage next ;P

Yippers®

Interesting read. Gotta say, I'm pleased I don't have to run that 91 .

CharlieGSanD

lucky!

Yippers®

.. instead of that gasoline/urea mix you poor guys get.

paul cormier

Whose FMIC is he running?

Mike M.

EVO

Mike M.

Very cool, Eugene! Thanks for compiling the data and the use of resources! Now we just have to round up the buddies with the other big turbo kits and mods, including that S4 with the NX IC misters.

Looks like there could be a "datalog" day as well as a "dyno" day.

Next round will be on 100 octane....

Bryans12v

I guess I dont have it so bad after all.

Sunoco 94, nothing else.