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Went to the track for 2013's last test n tune

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Old 10-30-2013, 10:10 PM   #1
Explosive
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Default Went to the track for 2013's last test n tune

My first time out since many bolts, nitrous and dyno tune.

I was disappointed on motor but pleased with the nitrous.



Pass 1 was on motor,

Reaction - .2640

60' - 2.11

1/8th - 8.89 @ 82.22

1/4 et- 13.64 @ 103.45



Pass 2 was on spray

Reaction - .2818

60' - 2.08

1/8th - 8.59 @84.43

1/4 et- 13.23 @106.62



Pass 3 was also spray

Reaction - .0579

60' - 2.11

1/8th - 8.58 @ 85.69

1/4 et- 13.19 @106.86



Pass 4, still spraying

Reaction - .2671

60' - 2.12

1/8th - 8.61 @86.03

1/4 et- 13.22 @105.59



Pass 5, motor and made my first pass in left lane (ive made about 60+ in right lane never the left)

Reaction - .2530

60' - 2.11

1/8th - 8.94@81.13

1/4 et- 13.77 @ 101.81



Pass 6, also motor and again left lane,

Reaction - .1071

60' - 2.05

1/8th - 8.82@81.95

1/4 et- 13.60 @102.75


I had a fuel pump issue on the dyno and was not able to spray much. Even the 50 shot went lean so we left the nitrous jet and went up one on fuel which is seemed to like but for reference, I did 286hp/302tq on motor and 356tq on spray did not bother looking at the hp on such a small shot but I'm going to guess 330ish on spray with the 356 tq.

I made 456 ft lbs @ 4400rpms on an aborted 100 shot run so next season once my fuel system is fixed I should be running well, also thinking of building my axle this winter with 4.10s and a 31 spline set up.
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Last edited by Explosive; 10-30-2013 at 11:28 PM.
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Old 10-31-2013, 08:14 AM   #2
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At least you got to run a few before the end of the year. Definitely need to sort out that fuel issue though.
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Old 10-31-2013, 09:13 AM   #3
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Yea, I also had no cool down at all, right from the freeway to tech to the lanes and low car count so it was pass after pass. That fuel issue sucks for sure.
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Old 10-31-2013, 08:22 PM   #4
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So these runs were done on a 50 shot?

Idk man, I was expecting the numbers you ran on the spray to be your motor ETs, and your runs on spray (even though a small shot?) to be well into the 12s.
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Old 10-31-2013, 09:52 PM   #5
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Not quite a true 50 by nx's chart. I too was expecting 13.20s on motor im not sure why it pulling the ****ty numbers on motor
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Old 11-01-2013, 05:22 AM   #6
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what tire on the back?
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Old 11-01-2013, 07:54 AM   #7
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That car should be in 12s, 60 foot is killing ya.
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Old 11-01-2013, 09:08 AM   #8
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+1 ^^^

Are you getting it to hook or are there traction problems? With close to 300 rwhp right now you should be in the high 12's na. Unless your car weighs 2 tons. Or the dyno #'s aren't accurate.
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Old 11-01-2013, 11:37 AM   #9
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Your sixty is average not great or terrible. A 1.9 and your in the 12s. How is your nitrous wired up? Are you using a window switch or spraying off the line?
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Old 11-01-2013, 01:02 PM   #10
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Quote:
Originally Posted by Explosive View Post
Not quite a true 50 by nx's chart. I too was expecting 13.20s on motor im not sure why it pulling the ****ty numbers on motor
If you're running the nitrous tune only for both the NA runs and nitrous, that would explain it being a tad slower on the motor passes.

You're pulling your fuel straight from the fuel rail right?
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Old 11-01-2013, 02:07 PM   #11
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Stock converter remeber its an auto. 305/35/R18 nt555r's out back.
Numbers should be right he show me sae and std abd i gave you the sae numbers. I have two tunes one for spray one for motor. My car could prob see high 12s on the spray i had the window switch on at 3000 off at 6100 and there was some lag off the line before i hit 3000 and slight bog on shifts. It dead hooks on spray even on spray
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Old 11-01-2013, 02:09 PM   #12
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Old 11-01-2013, 04:35 PM   #13
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The power is there on the spray to run mid-low 12s honestly. I think its some other things preventing it from happening though. Maybe your shift points are set pretty low, etc. Takes a little bit of everything to get the times to match the HP numbers.

Not trying to give you a hard time or beat you down, just hate to see a nitrous Mach still in the 13s and having owned 3 of them I know what they are capable of (automatic is a benefit in this case). I just feel like there is something somewhere slowing that Mach down that could easily be corrected.
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Old 11-01-2013, 10:42 PM   #14
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something just doesn't seem right even with a stock converter. in my old auto gt, back when it was midpipe/intake/tune/gear it went high 13's, like a 13.8 I believe. Your car should deff be upper 12's with a stock converter. Which track did you go to? I'd go back and get some more practice. Milans open for a few more weekends, test and tune this sunday.

also with your car making 350~ whp on the shot, just for a comparison my old gt with a 125 shot probably made within 25whp of you, and that car went 12.1 on a 555r. Your cars begging for a circle d and a shorter gear(not sure if you have a gear I didn't see that or not).


*edit* my gt ran a 13.70@100 with a 2.09 60' with midpipe, catback, tune, cai, and 3.73. The thing prolly dyno'd 230 if it was lucky being an auto. with 280whp you should be in the lower 13's stock stall/dr's.
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501/501 - 11.23@124

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Old 11-02-2013, 04:56 AM   #15
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350 wtrq not whp on the spray so the hp has to be a bit lower. I dont know whats causing it, too big a tire ? Ive got a **** ton of wheel time behind this car and have everything figured out at the track. It likes tire pressure and leave best off idle and was always slower on foot brake. I know he changed some tranny stuff with the new tune maybevi should have tried foot braking it? I cut like 3-4 tenths off switching to idle vs foot brake previously
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Old 11-02-2013, 10:33 AM   #16
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Ah I read that wrong then, still assuming 325 whp or so it should still be a very solid 12 car. Have you tried flashing the converter? that seems to be what a lot of cars like.
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654/546 whp/tq

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501/501 - 11.23@124
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Old 11-02-2013, 10:44 AM   #17
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How tall is the tire you're using? If its over 26", then that's a big part of your problem. Machs need to rev.
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Old 11-02-2013, 10:47 AM   #18
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Thats what i do, its always went better flashing as opposed to footbrake but like i said he made some tranny changes wonder if i should have tried foot braking once or twice. What makes it even worse is my entire back seat is out still so the thing weighs less too. I dont get it. Ive made so many passes in this thing i know how it likes to be driven. The only things i didnt do that i normally would is air up the front tires because one of thr cores are bent from all my track visits airing and dropping them so i left them alone
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Old 11-02-2013, 10:49 AM   #19
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Stone its a 305/35/18 so its big, and ive got 275's up front on 18x9's im fighting some rolling resistance for sure
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Old 11-02-2013, 11:08 AM   #20
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Yea, those tires are costing you some, but I don't think its worth ditching them over, not as good as those wheels look.

You would know if he tuned your trans aggressive or not. The WOT shifts should be barking 2nd gear on street tires, with a very noticeable thump in your back on every shift.

Flashing usually is the best technique on stock verters, either that or leaving off idle. Although my wife's TBSS leaves much harder when foot-braked to as close to 2k as possible. Sounds like you've got that part figured out though, I'd love to see a 4.10 gear, a solid 100 shot, and some hard WOT shifts out of your car. Run 11s.

Maybe give him a call and see if you can get some specs on the trans tuning. Locking the converter between the 1/8th and 1/4 will give you a nice bump in trap speed if thats something you want.
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Old 11-02-2013, 11:08 AM
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