Your 4th gear has to be pulling timing, your back half is only 20MPH, you are getting to the 1/8 at good speed though (roughly 90MPH). I would suggest turning the boost down to 22 (if you are running straight pump) and running again. You already stated you bogged your launch so that will effect it some as well.

 

He is bogging cause he doesnt know how to slip the clutch yet.

 

Edit: Looks like driving is the #1 factor. As others have said 24psi is very high for pump gas alone.

 

Yes. Now I was asking why my times were off, and my main thought was because of the launch. Im not getting "good" traction anymore with my new clutch. I was hoping that when I posted, and my thread was actually read by members, you would have noticed that I wasn't worried about my mods or the power I am making.

The 12.2 was on race gas, Forge mbc at near 24lbs, and still on the tune prior to getting cams. I figured I would match or beat that time with it tuned for the cams and boost. Thats why I was wondering if having my 60' being a 10th of a second off would equal half a second by the 1/4.

My car was just tune about a week ago by a very good tuner. I trust what he did. I am going to talk to him, but he is on vacation for about another week.

 

The 12.2 was a little while ago, not on the new tune with c16. 24lbs is what the tuner set it to, that must just be the spike.

 

If I can get a laptop with me to the track I will log the run. The boost right now is being controlled by the EMS so me changing it isn't going to happen. You are the first to give me a good breakdown of my runs, I thank you for that.

 

Yes I did bog, the 1st run, but only the 1st. This is a new clutch (exedy twin) and this was the first time I launched it at the track(only once on the street). Still getting used to it (launching wise). But it just grabs and spins the tires, my stock clutch would just slip. I am also now using the 2-step, first for that too. These room to slip it, but not much.

 

Ok well let me just make one observation ok? Please bear with me. Now before your new mods you were running around 12.2 correct? Then after the addition of your new mods you all the sudden cant get traction and because of which you are now going a half a sec slower. Am I correct here? Now you tell me. Are you sure this has nothing to do with your mods? I mean I dont know how else to put it to you. I mean I have put it to you the easiest way I know how. The point is before your clutch and your absense of knowledge to increase boost to 24psi on pump caused you to run so shabby. Now if you were to just take my advice and look at the root of the problem instead of trying to ignore the facts then your problem would be solved.

The problem is your new clutch grabs so well(and because you dont know how to slip it yet) is causing you to not get traction. Also increasing boost to 24 on pump caused you to pull timing and therefore caused you to lose alot of power rendoring you low trap speeds.

Turn your boost down to 21-22 on a mixture of pump and race. Learn to slip your clutch and you should be fine. Problem solved. Any questions?

 

Yes I thought you had the twin disc. I am assuming you got the HD? With that clutch you need to decrease your tire pressures and using slicks for a drag is a must. Cause your right that clutch is very hard to slip.

 

However, your clutch making lose traction still doesnt cause your traps speeds to be so low. So dont think for one second that your clutch is the reason.

 

Best time I ran was 12.4 with 344awhp with 80-90F temperatures and high humidity. I'm shooting for 12.0-12.2 this Friday since it should be in the 60s, 70s.

With 24psi on a 8 you may be pulling timing. I would suggest putting in some race gas next time and leave everything the same to see if thats the case.

 

if your tuned right 24psi is no problem on pump gas. that is what I run. best time to date is 12.4at110 on an VIII

 

The only thing that changed from the 12.2 to now is the clutch and the tune. Thats it. My car was just tuned about a week ago so the power I say I am making in my sig is up to date.

And I didn't turn it up, it was tuned for 24lbs. I don't know if what you thinking is I am just turning it up on my own, with out it being tuned or something, but thats not what is happening.

 

Correct, its the HD. And this whole statement is what I was thinking. And I think your starting to figure out where I'm coming from.

I know my clutch isn't making my car slow. And I understand what everyone is saying about the 24lbs, Im going to talk to John, but I completely trust him.

I just hope that when I get the launch down, and the traction better, that my et will be what I had expected.

 

Just so you know 24psi on the street doesn't always equal 24psi at the track. I also have a 3bar MAP sensor so I know exactly how much boost I'm running. I need to turn my MBC up about 1/2 a turn from how I drive on the street otherwise I'll only be @ 20psi while blasting down the track. It has to do with how the car is loaded when doing a 3rd gear pull from 2k-7k rpm on the street vs. shifting 1st-4th @ 5-7k RPM.