High school drags!

[steve]

Hey guys finally got my car to the track today and the best I could run was a 14.1 @105mph. This is with my holset at 20.4psi. The problem was I couldn't shift fast because my clutch wasn't fully disengaging but I should be in the 13's when I fix my pedal assembly.Here's a vid.
http://s908.photobucket.com/albums/ac290/stevetalon/?action=view&current=100_1357.mp4

[Cloud]

I'm certain you can get into 13's if you can get it to shift properly. I think my first 1/4 mile run was like a 14.1 @95mph so you have 10 more mph to play with :)

[thiazole]

105 is easily good enough for 12s. Also, in my experience, when your ET is much worse than your trap speed, your trap speed also goes up by a small amount as you improve your driving ie, with my old T28 set up, after bogging, I ran a 13.8 at 102mph. With a good launch, I ran 13.3 at 104mph 30 minutes later. I'd say you could run a 12.5 at 108mph if you got a good 60' time and shifted quickly.

[thiazole]

I see you are FWD - you'd need some sticky tires to have any hope of running 12s in that case.

[steve]

Im AWD and the best 60 foot i pulled was a 2.2. I think it was a 2.2 because of how slow i had to shift into second gear. I didn't relize how slow i shifted into 2nd gear until I watched the video and noticed it took a while to spool back up(shifting slow?). It would be awsome to pull off a 12 second with this boost level but to even think about nlts I need to fix my pedal assembly because it did not want to go into gear.Here was my time sheet.

R/T .147
60' 2.200
330 6.163
1/8 9.308
MPH 82.05
1000 11.921
1/4 14.112
MPH 104.69

[thiazole]

Your 60' should at least be 1.8 sec then. Are you using DSMLink? If so, are you stutter launching to build up boost? You should try to launch with at least 8psi. Every tenth you gain in the 60', you will pick up 2 tenths in the 1/4 mile, so that is 0.8 seconds that you lost right there.

[steve]

Im running ostrich/jackal speed density. My studder was at 5250 building like 6-7 psi. The guys at dsmap haven't added any antilag code so I dont know how to do it on the timing map to build some more boost. Do you get to your 60' in first gear?

[thiazole]

Yes - you should be hitting about 30mph at the 60' mark.

[thiazole]

Also, even back when I had a 16g and my 2.0L (with a manual, of course) I studdered 5500 to launch. You probably need to increase your rpm a bit. I assume you are bogging out of the hole? I would try 5750 or 6000rpm.

[steve]

No it does feel like im bogging at all. Is it possible I may be loosing some traction because in second it fells like im bogging. Right when I start slipping the clutch I hit full boost and I felt wheel hop in the front on one of my runs.

[thiazole]

Are your tires crappy? I can't imagine roasting the tires with only 6-7psi boost. I have Discount Tire Road Huggers, which are pretty shoddy for traction, and I've never had problems getting enough traction for 1.8 sec 60' times. You weren't driving through the water, were you? What clutch are you using?

[dsm_gsx97]

+1 for 6K launch. The higher the RPM the faster you're out of the hole. An old member 8 years ago told me that and told me to test it so I upped my launch till I found my happy place which is 6K.

Drop tire pressure down to help with spinning, but if you're bogging in second than you want the spinning in first. If you have suspension tighten it up to the highest setting. No water box like Thiazole said.

The silver '95 GSX that I just sold ran 12.6@106-8mph consistently for 2 years with 1.6-8 60fts, a 6K launch and shift point with tire pressure dropped 22psi in my all seasons. Sounds like you've got a similar car that might even be a little faster if you got out the hole quick enough.

After you set your launch to 6K have a spotter watch you to see how bad you're spinning and drop tire pressure accordingly.

Remember wheel spin is good, bogging/jumping is bad. Keep those tires spinning or your center diff will tell you about it.

[thiazole]

If you can log and record your speed sensor, then that would tell you everything you need to know. I've actually had both bad tire spin and bog in 1st gear in the same run with a manual transmission. You shock the tires out of the hole, your rpms jump to 7000, then all of the sudden they grab and rpms drop to 3000 and you bog.

Here is what I suspect happened in your case. You shocked the tires out of the hole and your rpms went up pretty high. You saw that on your tachometer so you shifted, but it was premature as you were only really going about 15mph. The shift therefore occurred before the 60' mark killing your 60' time and was way too early causing a major bog in 2nd gear and killing the rest of your run.

The solution to this is figuring out where the 60' mark is on the track and watching that as your indicator to shift. If you need to pedal the throttle a little to control spinning in the meantime, you could do that, but this way you will know you aren't shifting too early. This will make a huge improvement in your 1/4 mile time if I'm correct in this assumption.

[steve]

Ok yeah thats makes sense I think thats exactly what was happening. Right when I got home my dad pulled out his time slips and he was getting a 1.3 60' with his neon lol(srt-4):p on street tires without 2 step. I was going to log with my palm but it was dead and I couldnt find the charger:mad: This is the second time I've ran at the track and first time with the new setup so I probably need to practice. Is there a cheap/easy fix for the pedal assembly?

[steve]

+1 for 6K launch. The higher the RPM the faster you're out of the hole. An old member 8 years ago told me that and told me to test it so I upped my launch till I found my happy place which is 6K.

Drop tire pressure down to help with spinning, but if you're bogging in second than you want the spinning in first. If you have suspension tighten it up to the highest setting. No water box like Thiazole said.

The silver '95 GSX that I just sold ran 12.6@106-8mph consistently for 2 years with 1.6-8 60fts, a 6K launch and shift point with tire pressure dropped 22psi in my all seasons. Sounds like you've got a similar car that might even be a little faster if you got out the hole quick enough.

After you set your launch to 6K have a spotter watch you to see how bad you're spinning and drop tire pressure accordingly.

Remember wheel spin is good, bogging/jumping is bad. Keep those tires spinning or your center diff will tell you about it.

Haha yeah I didnt go in the water box lol. Wish I could burn out. I should have lowered my tire pressure(I think they are at like 33) but my dad just told me i should leave it. Yeah I'm glad I put in a tre 4 spider so I dont have to worry to much but wheel hop can still kill them right?

[Cloud]

You sure it's wheel hop and not clutch chatter? I had no problem getting 1.8 60' times even with a crappy shifting trans. 2.2 is horrid. I was getting something like that when my viscous coupling fried and reverted to fwd mode. With a 4 spider all you need to do is launch a lot harder. If it is wheel hop then make sure your motor mounts aren't cracked apart and loose, and a stiffly damped suspension makes a big difference.

[steve]

Wow I though I had my master rod on its last thread but I guess not. I dont know if the rod was working its way in because the nut was loose or I left it like that. So I got that fixed:D and found my palm charger:D. I'll try to get some practice in before the tuner challenge. Here I come 12 second:p

[my1997gsx]

Are you pre loading?
It help a lot with wheel spin and 60' times

[steve]

It was preloading by itself because the clutch was not fully disengaging but I got that fixed and pulled off a 1.9 60 foot without preloading just slipping the clutch:D. It must have been the track prep or temp that day.