KCIR ( Kansas City MO) had another test-n-tune session today. They opened the gates at 11:30AM, and scheduled to close at 4PM. Nice day - 60 degrees - it was partly sunny - a beautiful day for November. I got there at 11:30 for opening, and the schedule fell apart after that. Lots of mechanical problems on the track - lots of cleanup of parts and oil - and lots of delays. Between 11:30 AM and 4 PM, I got four passes. All set for 75-shot plus 75-shot, and using my version of Shift_Fast shifter set at 6300 RPM. I had my ignition coil voltage booster connected and set for 16 volts, and all new plugs set at .035, up from .030 .

These are my times for the day:

R/T.......043.........163..........100.........137
60'........2.016......2.083........2.074......2.06 2
330.......5.593......5.747........5.765......5.747
1/8.......8.595.......8.753.......8.766......8.767
MPH......81.58.......81.08.......81.26......81.16
1000.....11.202.....11.377......11.379....11.387
1/4........13.406....13.586......13.587....13.603
MPH......102.33.....102.91......102.23....101.68

By the numbers, this isn't much improvement over the last trip there, but I could really feel the top-end pull harder, with 102 MPH common. The ignition-voltage boost w/.035 gaps makes a difference!

Launches were OK, but the 60' showed no improvement, and I still didn't have much traction during the 1/8 mile except for the first run. Weird. I tried a roll-into-it launch, spraying after some time in first, and launching into 75-shot spray right at the light. No appreciable difference, it seems.

This may be the best this car can do - certainly this season is over. Maybe bigger tires would help ??

I am planning on a dyno on Nov. 18th - maybe something will show up with a dyno. I haven't dynoed since the car was stock - something like 145 WHP, I recall.

 

Are you using the second stage in 2nd and up gears? Does the 150shot hold traction or are you spinning? I also cant remember if you use slicks or dr.

 

I usually get into the first stage in first gear, then into the second stage either while still in first or wait until second gear. At this point, there isn't much difference in performance.

My tires are M&H Racemaster slicks, 23"x8.5"x15", mounted on 8" alloy wheels (American Racing) which weight 34lbs combined for each wheel. Short and sweet and light... Sounds like a diet, don't they?

I know they're spinning - I can feel the car move around in the front - and the next 75-shot in second gears spins the slicks for a while. I image it isn't just the power - it's the sudden application of power that knocks the slicks loose.

Too much of a good thing, I guess.

 

Arent these the same slicks that jime used for his 150 shot setup, also wont it be better to use 100 shot in 1st gear and engage 50 in second. That would deff give you better 60 time and make the car move faster.

 

I was thinking that Jime used M/T slicks "back in the day". He's hooked up with M&H ripple walls at the moment.....

(Remember, my auto is an Infiniti VLSD tranny, so I'm spinning both tires.)

Actually, the car seemed happier with the 50-shot first stage I was using, followed by a 75-shot #2 stage. I've pulled a 1.88 60' with that, and several 1.9xx 60'... I don't get it.. More power does not equal quicker..

 

I can't believe that you cant hook with slicks in first even with 75 shot.

 

Harry,

Sorry I didn't show. The conditions were ideal enough for me It was a hell of a nice day, but the calculated DA was still in the 900-1,100 foot range. I'm waiting for a 40-50 degree day with the DA in the sub 200 foot range before heading back out to KCIR. Also, I had over a 3/4 tank of fuel and I don't want that extra weight slowing be down

From the sounds of it, the track wasn't in great shape thanks to the break downs. I'd imagine there was some diff oil in the 60' area.

 

Hi, Dave - there were two lines of cars and trailers from the gate to the highway at 11:30 AM, when I got there. I got my first run at 1:20 PM, and got three more in - the last was 3:50PM, just before track closing. Crowded staging, lots of junk breaking on the track, tons of "hot cars" and bikes, so street cars only got 1/3 of available track time. Lots of fun, though!

I was definitely pulling harder at the top end with the 150-shot- almost clocked a 103 MPH pass. (102.91) Something is wrong with the first 330' performance of my car. Comparing Sunday to previous trips, and after smoky burnouts with the M&Hs, i'm stuck with the same ETs in the 330'. It's probably the driver, but I'm not hooking up well just after launch. Not that I'm complaining - 13.4s are OK.

I am pleased about the ignition voltage booster I installed - running 16 volts on the coils lets me use a .035 gap through the traps now. Before, with 125-shot, I had to gap down to .030 to get above 100MPH.

Heck, I'm glad the car still runs after four 150-shot passes Sunday and three others on the wet-track day! Next time.

 

did you try just running one stage and see the results, and you should try 100 shot as the first stage. also how is your tranny shifting? is it quick and firm or laggy.

 

wasent jime in the 12s with just 100shot?

 

Probably - but I'm not.....

 

The Infiniti VLSD tranny works great with the Shift_Fast mod. No problem there.

So you think I should launch w/100-shot and what - follow with a 50-shot once I'm into 2nd gear? I guess that would test traction, but I'm usually spraying 150-shot before I'm into 2nd gear - any combination seems to give the same 330' ETs, with one or two rare exceptions.

Have you used a 100-shot on launch - how did that work for you? Any advice on slicks? I'm baffled - but I got top-end ignition sparks now.....

 

you need the initial power of the 100 shot to give you a good 60 ft then the additional 50 shot should come by third gear. your shocking the motor and tranny with a 150 shot so quick and your probably just detonating and creating havoc.75 shot to 100 is the most i'd give at take off. you should try just a 100 shot and i bet you get in the 13's, easy the additional 50 shot will give you the last hump to reach 13's or even 12.9 with no problems.

 

Interesting - I don't have any preignition or detonation problems - 104 octane Sunoco "blue" and shaved-ground 2-step-colder plugs take care of that very well. I have run one 13.31, and that day I ran a 13.4 with three of the four runs over 102 MPH, so the power is there. I have run several 13.4s and more 13.5s this season. I have done a 1.88 60' with several 1.9x and buckets of 2.0x 60's.

However, the 100-shot launch followed by a 50-shot second-gear shot might be interesting..... Somehow, I don't get good traction in the first 330'.

Maybe this "Tonk Hawk" video of my last run would help - poor quality, but the real thing...

http://s48.photobucket.com/albums/f2...Nov05_0012.flv

 

its hard to tell with the wind noise but something sounds a little sluggish, what kind of tranny do you have? is it built, and how many miles. keep be clutches going bad and not gripping the power good enough, or your detonating. what program are you using for the nitrous, that 150 shot might be fighting with you. i'll give you an example, i ran a 75 shot with boost and ran a 12.8 and when i went to a 100 shot ran a 13.3. when i got home and ran my j&s i found out the car was retarding and slowed it down. the only way for me to make it work was to retune the car.

 

The tranny is a '99 Infiniti VLSD - pretty new. I run the tranny pressure at maximum on the strip and shift with my MSD-controlled Shift_Fast controller.

The ECU is stock and holds at 17 degrees advance WOT. No detonation or preignition evidence. I use the blue Sunoco 104 octane and shaved ground plugs with ignition coil voltage set to 16 volts and gap at .035.

Funny thing - I ran about as quick with the first stage set at 50-shot and the second stage set at 75-shot. Traction seems much better this way. That first 330' still feels wrong to me.

 

Speaking of shaved-ground plugs, here's a shot of one of my plugs after six 150-shot runs at KCIR. A nice clean insulator, no damage to the shaved-ground strap, and no ignition issues with the voltage boost set to 16 volts.

http://i48.photobucket.com/albums/f2...3/Dscn1407.jpg

And the booster power supply:
http://i48.photobucket.com/albums/f2...3/Dscn1408.jpg

Harry