Hyde made a little bit o'power ... - Toyota Nation Forum : Toyota Car and Truck Forums

JekylandHyde · 04-27-2006, 07:40 PM

This is a copy/paste of the post made by my tuner on mr2oc.com about Hyde's dyno session today:

Quote:

Originally Posted by NoShoes

Today was a fun day! Boost creep and clutch slippage contributes to a healthy 3S-GTE reality diet! Yay!

Please keep in mind that these are preliminary numbers. There are still several things that need to be addressed:

1) Wastegate boost creep issues (It creeps to 27 psi by redline)
2) A single disc clutch that just won't get things done at this level
3) The ignition timing map (I'm still running timing values that were more suited to the engine in this thread: http://www.mr2oc.com/showthread.php?t=178295 )
4) The a/f is still not cleaned up to my liking (I prefer to run 12.2-12.4:1 on Sonoco 110......it has a higher specific gravity than pump pee water, thus needed less parts fuel per parts air)
5) I did not get the chance to move the cam gears around. The intake cam is retarded 8 degrees of crank rotation (at 110btdc) from the intake cam from last year.

All that being said the engine did tremendously well. There are no really odd noises other than a little valvetrain noise. (I'll be re-shimming this motor later on).

When dealing with boost creep in this situation, I instructed Jeff each pass to allow for a little higher boost, and a little higher rpms. We finally found the boost leveled off at 27psi near 8300.

When a car has a boost creep problem like this, I find the highest it creeps to, and determine whether or not I feel comfortable tuning at that boost level. On Hyde, I have no problems with up to 30 psi, so I had Jeff add duty cycle into his boost controller so we could get to 27 psi for the full pull. We only got to 23 psi, so the pull posted below is 23 psi creeping to 27 psi at 8300 rpm.

On the next pull, we got 25 psi when the wastegate opened, but the clutch failed. It's now time for a twin disc setup of some sort. Jeff and I have several options lined up so he can hit the time attack event in May.

Here's the video:

http://www.jekylhyderacing.com/image...7_dyno_mr2.mpg

Here's the dyno, compared to last season's run at 22psi. The uncorrected number is 554.

The car's curb weight is about 2650.
With me inside it comes to about 2820.

Typically people refer to a fast street car having a weight-to-power ratio of 10:1
In MR2s, they look for 300 rwhp in a 3000 lbs car (mine's been lightened).

I think the really fast open wheel cars that run the hill climbs have a ratio of roughly 8:1.

Last year, at 440 rwhp we had a ratio of 6.4:1.

We are now sitting at: 4.9:1.
That's some crazy stuff right there.