A lot of information… for those of you with Internet ADD (too many words, man, let me just look at the pictures), I offer the below images, video, and the following summary:
Racing is fun, 270/23psi is the new 272/18psi, 80% throttle, more power, bang, let's go running, nice cars!
Mt. Okemo #1 / 2009 Video
I finally got around to putting together the video from the Mt. Okemo (#1 / 2009) event. I was waiting to get some course-side video from Joey’s father (I will post up all the course-side video that he took later this week). The video (2:27.85) is not of my best run (2:27.01) of the day, but the best run was a bit aggressive and I think sloppy in some spots, so I present the slightly slower (think “one-one-thou….” of “one-one thousand”) and cleaner run.
It’s dyno time…..the saga begins
Let's start by throwing some numbers out there.... 245, 270, 272 and 300.
Friday was a trip down to http://www.ktrmotorsports.com in Ayer, Massachusetts for a dyno tune by Marc Swanson of EFI Express (a4kquattro on Motorgeek.com / phone 603.413.6833); Marc tuned the car using the dyno at KTR. I got to KTR a little late because of a roll over on I-89 due to hydroplaning and driving around Ayer, MA trying to find KTR as they do not have a sign of any sort at the end of the "Truck Entrance" road that they are located.
First thing we did was get the next standalone coils hooked up and setup in the ECU. Next was the baseline dyno to figure out where I was all this time. At a dyno in my area, they determined that I had 272wHP (245, 270, 272, 300) at 18psi. Marc street tuned the car last summer to 23 psi of boost so I must have more than 300.... wouldn't you think? First run was 245wHP (245, 270, 272, 300), but there was something wrong.
Actually two things wrong.
Next few runs left Marc a bit confused as the HP was not increasing with advances in timing (I'm running full race fuel; 109 octane unleaded). Jim (KTR) noticed that the dyno only had readings up to 5000 RPM while we were bringing the car up to redline at 6700 RPM. The car was spinning on the rollers. Fixed. Twice.
Next run didn't quite seem right either and that was when Marc noticed (per the computer hooked up to the ECU) that I was only running at 80% throttle. It seems the cable was stretched a bit so I have been driving the car for quite some time at 80% (or so) throttle. Man, all those hillclimbs that I wanted "just a little bit more" in the straights.... and it could have been there. Darn!
Okay, we have a stuff together now and finally get the baseline power (remember, this is at 23 psi, so it has to be a lot more than the 272wHP/18psi power).... how about 270wHP? Yep, different dyno yields different results. Since last summer, the street tune gave me 270wHP. Of course, I wasn't using all of that thanks to a stretched throttle cable.
Time to get a little more power out of it, but more importantly, power where I need it for the hillclimbs (more low-end grunt). Marc and Jim spent the next hour making adjustments to get the power where it should be.
Marc tuning from the co-pilot seat while Jim controlled the dyno from the driver's seat... while I stood around not knowing what to do with myself, but noticing an empty box of Harpoon and a running refrigerator in the corner.
So what did we end up with? 299.4, but let's round that up to 300 since it is OVER 299, a bit shy of 300, and I feel like rounding a .4 up this time. (245, 270, 272, 300) But, let's talk about that number. It is not the limit of the turbo, engine, injectors, fueling, etc. It is actually the limitation of the 034EFI MAP sensor inside the ECU; it is limited to 2.5 bar. So, to get another 50wHP (per Marc), I would just need to send the box back to 034EFI to get the sensor upgraded. I might as well get the 034EFI "hiccup" fixed while I'm at it (the engine is running just fine and stops for a second like I hit the rev limiter). So, there is more that can be obtained, but I have to ask myself if it is worth it as 350wHP would be great on the track with FWD, but it might just communicate to wheel spin at the hillclimbs.
Time to hit the track... the running track. When I got home with the car I decided to take it for a little spin. I drove it very slowly/low RPMs until I was out of town; I turned right on a side road and gave it 50-75% throttle as the gas pedal felt a little funny going that extra 20%, and grind-grind-grind. Great, there goes my Drive Shaft Shop 475wHP CV joint. Or not. It seems that those 3rd gear pulls on the dyno did the transmission in (or perhaps it is just the clutch). I had to run/jog 3 miles home (good time to leave my phone at home, but who would I can anyway as Julie wasn't home.... my cat hasn't learned to drive the truck yet) to get the truck and trailer, come-a-long the car on the trailer in the rain, and then finally getting home by 9pm. Ack! Someone, somewhere, hates me (well, more than those ex-girlfriends). Time to drop the transmission and figure out what happened. If it is the transmission, I might look into the option of a 6-speed if it is something easy(ish) to convert and if the LSD can transfer from 5-speed to 6-speed. We will see. Maybe I'll get lucky and it will just be the clutch (wishful thinking).
Wow, look at all those nice cars!
KTR is a very large facility with A LOT of very nice cars (most of which I cannot identify, but you don't need to understand art to enjoy it). This is just one of the small rooms of cars directly outside the dyno room. There is soooo much more. It is like a racing-orient version of RPM (http://www.RPMvt.com).
Lotus Europa (but that isn't a stock engine)