It's not a racecar... without fire

[Flexicoker]

http://www.youtube.com/watch?v=lY79M57l-pw
http://www.youtube.com/watch?v=kH2nioND0rc

[Kirk Feldkamp]

It appears to be mostly off throttle overrun. Too much fuel or too little timing. It didn't seem to be popping much, so my guess is fuel.

Altogether it sounds pretty good. What kind of driver feedback are you getting with the turbo 250 vs. the old N/A 4-cylinder 600?

-Kirk

[KevinD]

just so everyone knows, this is our F06 car. we thought we would show the people at detroit what they are missing (trust me, we are WAAAAAAY more disappointed then you are that we are not going).

and the flames are from us playing with the Decel compensation. we were working on seeing how much it affected the endurance fuel mileage http://fsae.com/groupee_common/emoticons/icon_smile.gif

[Kirk Feldkamp]

What were the EGT's looking like in that region? Any noticeable 'antilag' benefits from doing that?

-Kirk

[Bill Kunst]

Why are you not going? I am sure that you mentioned it somewhere else, but I am lazy.
Bill

[KevinD]

we didn't have the EGT logger on for that run. i had to much data aq stuff on the car at one time and it was killing our batterys by the end of the day. sense then i have reduced the amount of DAQ equipment and it is happy again. P.S. 250s have a small charging system...

but our EGTs have been in the 900-1000F range previous to turning the boost up higher.

[Kirk Feldkamp]

How hard are you pushing the engine now? Boost? Power? Dyno graph? http://fsae.com/groupee_common/emoticons/icon_biggrin.gif

I don't ask much!

-Kirk

[Flexicoker]

What kind of driver feedback are you getting with the turbo 250 vs. the old N/A 4-cylinder 600?

-Kirk

Its usually along the lines of, "(heavy breathing) I need to go change my pants now"

[KevinD]

Originally posted by Bill Kunst:
Why are you not going? I am sure that you mentioned it somewhere else, but I am lazy.
Bill
See Dr. Woods post in the competition forum here.

[KevinD]

Originally posted by turbotwig:
How hard are you pushing the engine now? Boost? Power? Dyno graph? http://fsae.com/groupee_common/emoticons/icon_biggrin.gif

I don't ask much!

-Kirk

good question. turns out the data aq was reading map wrong. i suspect wrong calibration curves... we thought we had it up to 14 psig but that is in fact incorrect. the map is reading high. additionally we though we had full boost by 9k rpm but i suspect that is also incorrect. its gonna be more like 10-11k. when i get the right calibration in i'll be fixing my data... prolly do that tomorrow.

[Kirk Feldkamp]

What ECU are you using?

-Kirk

[Drewbe]

Performance Electronics

And here is a link to the forum kevin mentioned earlier:
here (http://fsae.com/eve/forums/a/tpc/f/825607348/m/80810952331)

[Erich Ohlde]

They are really just scared of the KU car http://fsae.com/groupee_common/emoticons/icon_wink.gif

[Jersey Tom]

That's pretty wild. Hows the transmission and clutch handle the power output now that its turbo'd?

[KevinD]

the transmission does fine. it likes to go to neutral on the 1st to 2nd shift which can be problematic, but with practice you figure it out.

[Mexellent]

Originally posted by turbotwig:
Altogether it sounds pretty good. What kind of driver feedback are you getting with the turbo 250 vs. the old N/A 4-cylinder 600?

-Kirk

Once it gets into the boost it pulls REALLY hard. The F4i on our 05 car is practically useless under 7500 RPM's, and once you pass that point, its a very damatic increase in power. Surprisingly enough, the turbo 250 comes into power much smoother than the 600 does.

[Jersey Tom]

Interesting. You can drop the start of the powerband down on a F4i to 5000rpm without much work though (props to Rich K). Ours used to pick up around 7500 as well.