I have a lot more data for me to analyze to my wit's end and for you all to roll your eyes at. The extra data has only muddled my thoughts...

Tonight I went to PMI, which is our other local dragstrip. It is much more backwoods and podunk than Bandimere in Denver, which is an NHRA-sanctioned track with great facilities, a great track surface, and usually great prep (at least during race events but not so much on TNT nights). Here are the main differences in these tracks:

- Bandimere is 1000' higher in elevation
- This results in a typically HIGHER avg trap speed at PMI, which is lower
- Bandimere has much better track prep and a much better launch surface
- This results in a typically QUICKER avg ET at Bandimere due to much better 60's and 330's

To reiterate from last week at Bandimere, I was hitting lots of 118mph traps but only hitting 11.8x ETs with mid-to-high 1.7s. Not good 60's due to no VHT and lots of tirespin, but 1.7s should be good enough for 11.6-11.7 with such high traps. I was only doing mid-to-high 11.8s, so I figured the traps were reading 2mph high.

Fast-forward to PMI tonight where it was about 80* when I got to the track. Due to my nice ETS FMIC and piping, I wasn't worried about losing power with 80* and was hoping that meant the launch pad would be warm and sticky. I also had on a brand new set of 255/40-17 Direzza Z1 Star Specs, which are no good for drag launches really, but I thought they may grip a little better than my 2yo RT-615s that were bluish and hard due to so much racing (drag/autox/track).

As I said before, traps usually are higher at PMI, but ETs are worse due to no traction. Here are my 1st 4 runs - all hotlapped:

11.88 @ 117.62 w/1.75 60' (whoa, ok, so I hit 117.6 right off the bat, but this was to be my BEST 60' of the night - ugh)
11.89 @ 117.91 w/1.76 60' (basically the same 60', and my trap went up a little)
11.84 @ 118.05 w/1.78 60' (ok, worse 60' and slightly higher trap, but a best-ever 11.84?? Imagine a 1.68 60' here, bah!)
11.88 @ 117.7 w/1.78 60' (still can't hook, but car is pretty strong)

From here I tried lowering my tire pressures and launch control, but it's just simply not doing anything. As temps dropped, the slick concrete surface got colder and more slippery. I kept dropping to where I was doing regular 1.82-1.85 60's and even had a 1.91, but none of these were bogs. All were spinning with very low tire pressure and low launch rpms. Also, my traps went down despite the cooler temps, but I think that's due to the cold tires and very low tire pressures. During my hotlap runs, the tire pressures climbed to 26-ish when I normally try to run 22. When I got them back down to below 22, the traps went down, and I was averaging 116.8-117.2 the rest of the night. Interestingly, though, I managed to pull an 11.97 even on a 1.85 60', so that tells me my driving (shifting) is back to full form, and with any decent 60's, I'd be pulling something closer to a low 11.7 @ 116-117, which is where I really should be anyway.

Best slip:


Losing bracket race slip:


Interesting 11-sec run with 1.85 60' slip:


That was an awesome heads-up showdown with my friend and fellow Revolutions Performance sponsoree - Steve - in his wingless GT35R STi. He just got the motor in and cinched up a few hours earlier and was testing at 17psi. He's already run 10.9 @ 130 up here at altitude, and it's still fast enough to beat me even at 17psi, haha. His previous 3 runs hadn't been so good, so I think I was able to really motivate him on this run, because he was able to barely run me down by half a tenth. He had just put down 408whp on the dyno where I put down 367 last week, so you can see the numbers are quite consistent with his traps showing the extra power from the dyno despite having to shift to 5th.

 

Here is my slip Clayton, not sure if it will help you any at all. Similar ET/MPH as Fathouse....

 

Warrtalon what cams are you running? and at how many lbs of boost are you at? also you have a 5 speed with 9 turbo correct? Not bad numbers at all.

 

Nuked, did you shift to 5th? Why was the trap so low? It should have been around 116, but you can really see the benefit of a good 60'. I don't make up that launch discrepancy until the 1000', but I highly doubt I was going 3.5mph faster on the top end, because I only catch up by .02s.

 

1) GSC 272i/264e - these are old school now with the S-series on the market
2) 26-ish psi
3) Yeah, 5spd w/IX turbo

 

pump gas?

 

That was holding the MR 4th out. I think it was mainly running outta gear and some 4th gear knock.

Yes I learned that the 60' makes or breaks the ET. With the new turbo I could not launch to save my life (2.0/2.1) and went 12.0 @ 120mph haha

SQ

 

Hell no, hah! This is a mile high, so power suffers greatly. I run on E-85 24/7.

Nuked, yeah, the MR 4th gear doesn't help.

 

Ah ic what do you have to upgrade to run e85 besides injectors.

 

Fuel pump, which most of us already have anyway, and then big injectors. I'm using 850s, and some people use 1000 just to leave room for a minor turbo upgrade down the road.

Some prefer to do the fuel rail at the same time, but I haven't bothered.

 

So wait, I thought you had the 5 speed now? Either way here is one of my timeslips from last summer..MR 6 speed, GSC S1's, hot air intake, exhaust, and perrin FMIC..Traction was non existant, I was spinning off the rev limiter with the stationary rev limit set at 4700rpm lol
880's go in tommorow, then I will be running E85 at the track..I don't know why I am even trying to make this car faster in the 1/4 with this transmission and this turbo, every time I shift, I am shifting right into the turbo falling on it's face lol..With this trans I need a slightly larger snail.
I'm on the left

Owned by LS1, I reeled him in surprisingly.
vid for that slip
http://www.youtube.com/watch?v=G_6U-RonLpA
Track prep owns me..Keep in mind this ET is only .03 fater then my car with only intake exhaust and boost WTF lol

 

Petey, you're feelin' me man!!! I thought that was one of MY timeslips for a second!

Yeah, I'm on the 5spd - I was just reminiscing with Nuked about the 6spd limitations at this power level.

You know my pain then. I am dreaming about cutting a 1.5 on the DRs next weekend during the big import event here. That would be a great time to do it, because you know what that's going to do to my ETs...

 

I think it has ALOT to do with track prep. This year I went to Atco firt run I bogged launching at 5600, next I bogged again at 5800, raised it to 6200 and guy in front of me broke (track cleanup for an hour or so) then I proceed to a 12.1@116 with a 2.0 60 foot time spinning and standing still basicly..25psi on a decent set of RE01R's 245/45/17..I can't win with theese tracks anymore!
I'm sure the DR's will help ALOT just don't break the car trying to "clean them off"
BTW I have tuned my car for 116 race gas, it made 400@ the wheels, but I am to broketo shell out that kind of money for gas,plus I realized the power level would probably be unatainable banging through the gears but rather a roll on power level since the turbo wont make the boost, hence my switching to E85 for the track.

 

Good, E-85 is our savior.

 

This is really part 3, but I figured I wouldn't make 3 threads on the same topic. I'm going to use my faithful timeslip from Fathouse to compare again, especially now since our numbers are even closer. I will compare with Manny and Wiznaz when I get their timeslips:

Timeslip-----Warrtalon---Fathouse2
60--------------1.68----------1.73
330-------------4.79----------4.88
1/8-------------7.44----------7.51
MPH-------------94.88--------93.35
1000------------9.72----------9.77
1/4-------------11.65--------11.68
MPH-------------119.67-------118.10

Ok, so now I start off with the better 60', but watch what happens. I go from a .05 lead on the 60' to a .09 lead at the 330. At the 330', I've already made 2 shifts and am well into 3rd. I then make my 3-4, which is an easy no-lift, before the 1/8th, yet notice he has begun to start catching up (.07 difference) at the 1/8th despite being 1.5mph slower? Not likely.

Then, the whole back eighth, I'm just chillin' in 4th while supposedly ripping up to nearly 120mph but somehow Fathouse is chasing me down with still 1.5mph less. He is down by .05 at the 1000' and .03 at the 1/4. So, how could he continually catch me while going slower? Consider if I was really going 92.88 at the 1/8th and 117.67 at the 1/4. Then, he'd have about a half mph advantage for most of the run, which would explain small gains in hundredths while traversing the last 990'. Right? It would mean that I was slightly quicker with a little less mph all due to a 60' that was a half-tenth better. I think it's cut and dry.