Well gotta say, I am happy with the 3" exhaust and the 225/50/15 Hoosier DRs. My first few runs were pretty bad launches (1.9-2.0 '60s) where I was inhibited either by me not being man enough to drop the clutch or my 2-step (apparently) slowing me down. My best launch of the night was a hard slip from 6k rpms on my final run that got me a 1.83 which I'm very happy with on radial tires.

Here is a breakdown of my 3 fastest runs.

First run off the highway 6pm, DA 1877. DRs at 20psi, short first gear burnout.
Video:

Slip:


2nd good run, only time I managed to launch decently with my 2-step. DA 1444. DRs still at 20psi, still failing at launching hard enough. Loving this trap speed, that's over 1mph faster than last year's PB 107.5 run....



My final run of the night, DA 1298. DRs at 19psi... I slipped the clutch hard from 6000 rpms after a healthy 2nd gear burnout and hooked pretty well (tiny bit of wheel hop as I pop the clutch) to a 1.83 '60 foot and a new PB. I actually saw the 1.83 up on the board and had a momentary brain fart in which I lift shifted into 2nd (just listen to it compared to the 3rd gear shift) which probably lost me.5-1 mph.
Video:

Slip:

 

nice times!

 

Nice times ... typical gain with a dude that knows VQ35's from so ... 0.125 to .25 = 20+ .. = minimally 107+ MPH ...

 

great times. That UTEC tune must be doin real nice. You going to get on the bottle this year at all?

Edit: what was your 2-step set to? For me, the 2-step has to be set a little differently from the xRPM launch. Also takes a bit of getting used to. However, once you get used to it you will find that it helps a lot with consistency

 

Yeah on my PB runs, I was getting 84/83 1/8th traps for my 106-107s. Around 22-24mph in the last 1/4 is pretty normal for me to pick up.

Also my 13.0 was on a 8.38 1/8th mile! If i'm quicker down the last half of the track now also, that could be a 12.7-12.8. Now watch me have to wait until this fall waiting on weather to run a 12. haha.

The 2-step was set to 4k. It works great and increases my consistency with street tires, but it's difficult to launch hard enough with it on the DRs. I may have to set it to a higher RPM for it to work out for my DRs.

 

Great job.. Congrats..

 

what would be the times in the 1/4... calculations please

 

Considering I gain the same amount of time and MPH in the last 1/8th mile as I did in my previous PBs (should actually be a little quicker, though), you're looking at a high 12.7 or 12.8 with a 108ish trap. Corrected to a 0 DA from 1200, it could be around 12.5-12.6@109-110, but I doubt that correction is very accurate.

 

yea... but good shiiit

 

Yeah man I'm stoked! Was getting really tired of running on street tires... Last time I went to Piedmont with the 2.5" exhaust and street tires, I was running 8.7-8.8@83s.

It may be Fall before I get a decent <500 DA day at rockingham or coastal plains for a new 1/4 mile PB, but I'm hoping I can still pull a very high 12s this Sunday with a 2k DA at rockingham.

edit: actually, if it gets down to 70 or so and the pressure doesn't drop below 30hg, then I'll be looking at a 1000ish DA at rockingham this weekend. That isn't terrible!

 

^^^ oh yea aint it yall big track day this sunday???

 

Nice. I think my best was a 8.4@83.

 

Yeah but Steven managed to pick a pretty bad day for it. Not only is it some kind of huge event/car show thing, but it's a day race... On the same weekend that both friday and saturday are night test and tunes. haha

 

hmm...

 

Badass man! That's a great time!

Looks like those radials are working pretty good for you.

Oh...do you have more info on your clutch/flywheel setup?

 

I love that no lift shift! Really big difference in engine tone and overall performance in that last video!

 

Clutchmasters flywheel, clutchmasters stage 4 6-puck clutch.

 

Yeah if you listen closely in the 2nd video, the 1-2 shift isn't a no lift... I saw the 1.83 up on the board after my '60 and brain farted just before my shift, and ended up lift-shifting into 2nd and then did a good no-lift into 3rd.

I'm actually not using the WOT box for no lift shifts anymore... Since it cuts power the MOMENT the upper clutch switch gets tripped (almost as soon as you touch the pedal), it actually unloads the car by cutting power just before the clutch gets disengaged... It wouldn't matter in a F/I car, but that extra moment of power seems to make a big difference for me.

 

Aren't you able to adjust the time the box is allowed to cut timing/power?

Man I can't wait for the track to open up! Have been dieing to test out my current 3" setup!

 

Haha our tracks are open Mid january through mid december...

Of course I can adjust the amount of time that it cuts power, but it still cuts power as soon as the clutch switch is engaged. There is no delay or any way to create a delay, so I have that maybe .05th of a second that I am slamming the clutch pedal down in which power has been cut, but the clutch is not yet disengaged, which really eats at the momentum through the gear shift.

I do fine no-lift shifting without it, and the tire shock on the shift seems to gain me considerable trap speed. When I tested it at piedmont with my 2.5" and street tires, 90%/lift shifting would give me 81-82 traps, while no-lift shifting would give me 82-83 traps. That may not seem like much, but it's pretty substantial when you're pushing everything you can out of your setup.

 

3" FTW! lol

 

It's nice, but my previous bests were done with an open Y-pipe, which obviously flows a little better than a 3" pipe, but obviously not much difference.

 

Good job, I always enjoy these types of threads!

 

Nice Run Sparks! Wish I could say the same.....Right B4 I registered my car there were two blown engines..... and both lanes got soiled......I got 2 runs and not so happy results with my new 3" catback.....but faster than my last 2.5" times 0f 14.6 @ 94 mph....
Right off the highway my first run was in the right lane:

R/T .198 (Great!!)
60' 2.247 (sucked) I'm normally in the 2.1's without ES MM, now I have ES MM! This is where I need to improve....
330' 6.198
1/8 9.417
mph 77.68
1000' 12.208
1/4 14.580
mph 95.01

2nd run was in the left lane (greasy):

R/T .168 (Even better)
60' 2.325 (Tried leaving harder) burnt a little rubber
330' 6.302
1/8 9.555
mph 77.20
1000' 12.362
1/4 14.757
mph 94.14

So I'll practice launching this 3" beast some more....my speedometer and Gtech have me at 105 on my road tested 1/4 mi....on my little testing ground....will concentrate on my 60 ft acceleration and I should be trapping @ 100-105 mph....I find the 2.5" bpipe and Oem rear Muffler too really be great at producing good 60 ft accelerations, never had one above a 2.194 and that was with bad Oem MM.....I'll try again.....ran 23 psi in the fronts with no burn out.....maybe next time I'll heat them up a little....But I'll hit another track maybe tonite!!!!! Gtech is measuring 6.3 sec 0-60, not bad for my wife's car with my daughters car seat in place....LOL! It seems to have a lot more torque in 2 gear than the 2.5" setup....By the way several folks thought my car was turbo'd due to the butter smooth exhaust note last night.....LOL!

 

I wouldn't blame your results on the 3" catback. Remember that every day you go to the track (even if it's the same track) you can have wildly different results. When I had basic boltons/no tune, and only street tires, I would vary from 96-102 mph and 14.0-14.9 lol. With so much variance there's no way to really tell what a single mod gave you unless you're comparing with a similar DA and '60 foot.

First thing I would do is find out what the DA was. Just search DA calculator in google and use the dragtimes one. It works quite well. After that, just keep going back practicing and look for a good DA.

 

I'm not blaming the 3"....I found out after paying for my registration that someone's engine let go on the track....My 60' was worst but my times and mph were better....So I'll concerntrate on my launch and 60 ft and I'll get it to the 100 mph trapspeed....I didn't even powerbrake just stomped it with some control....I'll powerbrake next time between 1500-2000 rpm and use a bit of finese' to not light them tires up, just keepin those rpm's up...I'll check out what the density altitude was last nite as well......thanks

 

I like how you concentrate on your launch so much. As in not trying to get a perfect reaction time since your not "racing"

Thats something more people need to realize when they are trying to go for a new PB (including me)

 

Yep, concentrating on the lights is definitely a distraction.

Don't think I'll be sleeping at the tree if I go to Maxus, though... about 2 out of every 3 runs i've done overall in this car has been practicing both R/T and launch. Last time at Piedmont I was able to pull .1X R/Ts and ET within .1 on 5 runs in a row

 

Also usually when you light them up, your 60' and ET suffers but trap goes up.

 

That's not usually the case for me. My trap remains nearly identical as long as my shifting remains the same. In the same respect, if I light them up in 1st, I will certainly also light them up on the 2nd gear shift, which destroys my trap speed.

The main reason I got a lower trap on that 1.83 '60 run is because of my failure to no lift 1-2.

 

Moereso pronounced in the quarter without aid....2 step

 

I have only had the 2-step for 1 track day which was Thursday. I only used it 3 times, even then.

Still works the same way for me in both situations. The last 1/4 is just 1 extra gear shift. It may be different for you with the auto, though.

If spinning off the line would actually give me better trap speeds, then it stands to reason that bogging or pussyfooting off the line would also give the same effect.

However, my best trap speeds have almost always been on my most solid '60 foots.

For example a couple of weeks ago at coastal plains, I pulled a 2.7 '60 foot and pulled a 14.0@104 because of spinning horribly off the line, then a 2.4 '60 foot and a 13.6@105.

All that said, I'm not saying you are 100% wrong, but I would like to hear you break down the logic of what you are saying if you have the time. Just an explanation of how a reduction in traction and thusly a reduction in speed at the '60 foot mark would cause an increase in overall acceleration would be great.

 

Sweet times man, are those n/a or nitrous passes?

Its amazing how much of a difference 60' makes on the ET. I get the same 85mph but with 8.5sec, but a 2.3 60'

 

Oh that's N/A. I trapped 90mph in the 1/8th with the 75 shot back when I was trapping 80-81 NA.

 

Not to get into a pissing contest, but that’s what car forums are for right?

Anyhow, this proves my point, maybe I wasn’t clear. But spinning horribly doesn’t make you get better times/traps, but gives high traps compared to their ET’s, as in what you just said. 4 tenths with a difference of 1mph …

That was my point.

 

Now what you are saying makes sense, but reread your wording below...

That certainly sounds like you were claiming higher traps when you light them up than when you don't light them up. Maybe saying "but trap remains the same" would have been a little more clear.

 

it was too early and from my phone at the time, and I have poor communication skills

 

It's all good!

So when are you taking that beast of yours to get some track times???

 

Wow I would think a 8.5 with a 2.3 '60 would need a 90+ trap. When I run 2.2-2.3 '60s, my 1/8th time is more like 9.0-9.2

 

Best DA’s around here occur at either end of the season, which the track closes in mid November. I could probably get close to 0-1000’ DA’s, which would be nice considering the track is @ 5200 ish.

After I get my dyno and exhaust, etc, I might get a hair up there and go within the next couple of months.