bisdakr

went to the track again today, the weather was nice at 52 degrees..seemed like everyone was hitting the 13's except for me..had couple of 350z's and sti's there stocks were running 13.6 to 13.8 with traps at 103-106mph..I on the other hand with my evo-x with 4500miles on it only ran a 14.0 at the best..made 4 runs last night and all trap speeds were well bellow 100mph.. my best was only a 97. my launch felt really good and car took off nicely but it felt like I was loosing power on the high end..I shifted a 7, 7.1 and 7.2 at the most but I really feel like im loosing power..shouldn't i alteast be hitting 100mph trap speed? I haven't done any engine mods to the car..The only thing I did was lower it and change the wheels and kept the same tires. Any diagnosis? I know my driving isn't best but at decent I really feel i should be hitting atleast 100mph.

--photo of slip updated on pg 2

project_skyline

iTrader: (30)

Wheels and tires, slips???

Your probably shifting a little high, i would shift lower to stay in the power band and then ride 4th out

bisdakr

No slips at all my launch was just right..I also shifted right before 7k and ran a 95mph.

Svendiesel

iTrader: (25)

Check for boost leaks definitely. Boost leaks are huge power killers. If youre tuned at 20psi and only 12 or whatever psi is making into the motor because of a huge leak, theres your explanation for the low trap. I know you said youre stock and I dont know what stock boost is on an X, but I was just using those numbers as an example.

bisdakr

Sounds reasonable..sorry for the noob question but how do I check for leaks? The Evo x has no boost gauge.. I don't even have an idea how much I'm boosting..hehe. Thanks again for the reply.

bsmart82

Post your time slips. 97 does not sound that bad for a bone stock X.

erald01

iTrader: (5)

you are traping that low cause your 60fter is bad let me guess its above 2.000.?

bisdakr

that's the thing i didn't like about the track last night..the time slips were only showing reaction time, trap speed and quarter mile. I know the last time i went though I didn't get the launch down at all and was bogging almost every time and traping 95-97. This time no bogging at all and it felt really good and I felt that kick on take off and tires grabed the whole way, i just dont have the 60ft to prove it but i'm sure it was atleast decent if not a good launch. I raced a Z that ran a 13.6 and left him off the start but he ran a 13.6 and I ran a 14.1 traping 96. almost all the drag threads on here on bone stock X are trapping over 100mph even first timers in the track.

bisdakr

actually on one run I hit a 14.4 and 3rd gear didn't go in on the 1st try but still traped 96mph.

Mellon Racing

iTrader: (38)

the stock tune is pretty horrible, have you considered getting that fixed?

Svendiesel

iTrader: (25)

Youd make a boost leak tester, very cheap to make. Heres a write up https://www.evolutionm.net/forums/ev...er-5-02-a.html

DRAG

iTrader: (3)

97 isn't that far off depending on how you drive. I ran 13.7 @ 100.9 stock but I was driving pretty hard to get it.

Did you make sure to turn your stability control completely off? I have left mine on accidently before and it cuts power through 1st and also right when I hit 2nd gear.

bisdakr

I did turn it off..you're talking about the asc right? Hold it down till it beeps?

BGevoIX

iTrader: (75)

I haven't seen a lot of Xs run in stock form, but that seems kind of slow. I thought they were pretty on par with stock 9s...mid to low 13s and trapping a little over 100mph???

THUB

iTrader: (5)

A X is like 4-500 lbs. heavier than a IX. They're definitely not directly comparable. the IX can run low 13's stock perhaps even 12.9 with a really good driver. The X is a high 13 second car (at best) with a good driver.