Wheel spin is killing your time. You didn't mention until your last post that you had any so it was confusing trying to figure it out. Think of it like this, if you are spinning hard off the line then the car really isn't moving anywhere, BUT the time is still ticking away. Once you get traction there is still plenty of track left for the car to get up to speed thus resulting in a good trap speed. Don't be dissapointed. Your trap speed reflects the HP you gained and your time will too without the wheel spin. It's time to work on traction...

 

14.2 @ 87.5 mph seems like a strange time for you to have run pre-vortech.

 

Yet another thread to scare me towards the ATI

 

I think the 14.2 was with a 50 shot but I lost tracktion like I said I usuallt averaged mid 13's on n20.

Here is the 14.2 slip:
r/t .62
60' 2.136
330 6.014
1/8 9.181
mph 76.90
1000 11.906
1/4 14.269
mph 87.59

 

why would this thread scare you towards the ATI? so the vortech is causing the low times, right? so an ATI will produce the same (less) hp, BUT NOT produce wheelspin? come on. it has zilch, nada, zero, to do with the vortech.

 

it must be the custom painted interior that is causing it, damn im not gonna get that now!

<----rolls eyes

 

I posted that before I read that he had wheelspin. You don't have to get all heated. I'm just saying that lately I have been seeing more and more people talking about how they have under 8lbs of boost with a 9 lb pulley and that the numbers appear to be off with what they should have. I have always been a fan of the Vortech kit and BEILIEVE me it was my first choice. I just lately have been seeing that maybe the ATI unit does have more power potential there. Even the Vortech rep was on here saying that the impeller speeds appear to be AT or NEAR their max at 7100. Conversly the ATI unit have a lot of head room left stock. Just an observation and what I see. Sorry if I insutled your Vortechness

 

So you ran a 14.2 @ 87mph on a 50 shot? I dunno man, things just aren't adding up. Either you're not driving a Z or something is really wrong w/ your car.

 

miaplaya.....i wasnt heated, i just found it strange if you meant that the wheelspin would steer you from the vortech, about the boost issue, i recently did some runs and recordings with my R4 software and im getting 7.5psi with the 8lb pulley, but im not reaching the limiter, i think my exact numbers were 7.5 @ 6600, so i hope with my 9lber ill get over 8psi.

the way i feel about the units reaching max impeller speed, is that it doesnt matter how much more room you have if your motor is near its capabilities, why say the ATI has more potential if you cant use it without a motor build.

 

That was only one run when I was trying different launches I broke loose at take off for a sec.FYI n2o definatly added more torque in the low rpm range causeing the added wheelspin my best run on the 50 shot was a 13.3 given I have a 5a/t with a system and full body kit I feel that is pretty good.As for the vortech kit last night I checked all my vac lines and tighened a few and with the stock pully I am now getting a full 8 psi at redline.But the point of this thread I am trying to figue out why I am having to try to get low 13's or even a high 12 when I am showing about a 100 hp increase over stock.The car definatly pulls like a b-tch with the vortech mostly in the higher rpm range.

 

On another note I am happy with the fit and quality of the vortech so far my only complaint right now is me track times I just feel I should be getting better times than that.And the hp to time ratio does not seem to add up especially when I can definatly feel the added hp it feels almost just like the n2o maybee even more but I am not seeing the n2o 1/4 numbers.

 

You have been chiming in on every Vortech thread saying the same thing....stop talking and go get that ATI...then come back and we will help solve your problems....WITH THE ATI.....If you do a search you'll find lots of people with either SC have little problems that need to be solved

 

real test of hp is 40-70 runs...

im guessing you are launching wrong. a 2.2 60ft is just poop. i did that in my gfs 150hp turbo beetle. you should be down around 1.8 at least. im GUESSING but you are probably bogging down...launch a little higher, lower the rear tire psi a 3-4 pounds from street use. but use your noodle and dont blow out your diff if the track you are on is super sticky or your main prob is wheel spin in first.

heres my post up from another thread "Launching my car with street tires is a difficult and tricky process due to the amount of power, limited traction, and wheel hop that occurs on standing start acceleration.
I never slip the clutch. Slipping the clutch results in quicker clutch wear and isn't necessary for good launches. I always let off the clutch very quickly.

First, find an RPM point to launch at that is just high enough to avoid bogging down the car. For my car, this point is around 3,500 RPM.

Hold the RPM's at the point that you found and quickly let off the clutch all the way. The car should start spinning the tires. When the tires start spinning too quickly and you feel that the car is approaching wheel hop, lightly let off the throttle. Modulate the throttle to keep the car moving and tires spinning, but not wheel hopping. As soon as you feel the car getting more traction apply full throttle. This may seem difficult at first, but will eventually start working for you with practice.
"