Ok, well my first attempt at the track last weekend yeilded me a 15.6sec time, granted this was in horrible conditions. I went back to the track today to find out i was still running where i shouldnt. My best time was a 15.01 and just shy of 92mph, WTF? I know i should be weeeell into the 14s with my Y-pipe alone. And yes, i can drive a 5sp very well, my friends stock 5sp (except for panel filter) ran a 15.1 today. Has anyone had any problems with their Y-pipe, more particularly the flex section collapsing?! I havent got to take a look at it yet...



eric

EDIT: Also, ive raced my friend in his 5sp, and i cant pull at all on his car (from a roll) like i should...

 

can you post your slips please?

 

Ok, heres some pics, sorry if some are fuzzy, took um with my diggy real quick (no scanner)








those were the best out of my 26 runs i made today


eric

 

the rest







eric

 

hmmm. i was hoping to see high 60 ft's or something. Everything on your slips look to be in order and consistent. is your car cali spec?

 

well my 60fts arent impressive by any means...kinda bad i think, i could use some better tires ( running on non-grip friendly allseason-540treadwear rated tires), but thats the thing, everything looks consistent, but SLOW, my friend ran almost as fast as i did (.1 off), not something that should happen when a y-pipe joins the equation..


eric

 

Your car is definately not making the power it should be. What elevation is your track at? Check that Y-pipe too.

 

im in FL, so below or right at sea level pretty much... Yeah, thats my thoughts...gonna be checked in a coupla days...


eric

 

Yeah, that looks like you still have a stock y-pipe? What type of y-pipe is it anway?

My car at 500ft ran the times in my sig with just y-pipe and intake, so my bet is on a bad flex section.

 

Oh, you did take the subs out of the trunk right??

 

My times went from 14.4 to 15's, once my y-pipe closed up almost completely.

If you have a Cattman, I would suspect thats the problem. That was with my 97 SE 5 speed, with JWT Intake, 2.5 inch custom exhaust, and the Cattman Y-Pipe.

 

What track do you go too? I live in FL

 

Those times aren't too bad. And you improved almost a half second from last week, so you're going in the right direction.
Are you keeping the car in third gear at the end, or are you going to fourth? I know our cars lose power past 5.5K but I've gotten my best times leaving it in third.
Also, what's the condition of your spark plugs/fuel filter?
An intake wouldn't hurt either

Terry

 

I think it depends on how fast you shift. I was never able to break 15's stock while leaving it in third, but a quick snap into 4th put me into 14.9's? This of course has been discussed and beat to death though lol

 

ok... My best runs were by launching a tick over 2Gs with minimal spin and no bog, and leaving it in 3rd all the way, however i was at or past the redline every time (6600). My Y-pipe is from Budget exhaust. And yes, those are the times of a STOCK (exception of K&N panel filter) MAx, friends ran a 15.1-- with very similar 60fts...I went to Desoto Speedway in bradenton...also my tires were set at 19psi with my best run...

now my pipe is coming off wednesday for a meticulous check and i pray somethings wrong, it doesnt pull like it used to, perhaps a collasped flex section?


eric

 

If it's not pulling, it's probably not breathing very well (from one end or the other). If everything in the intake system is good, then I'd say it's the exhaust.

 

Try shifting to 4th at around 6000rpm instead. Also, where are you shifting at up through the gears? The 4G motor has no top end, so it's actually quicker if you short shift a little bit. Redline on the 1-2, about 6200-6300 on the 2-3, and about 6000-ish on the 3-4.

19 psi is a little low and might actually be slowing you down even more. Try lower 20's instead. Also, considering all the stereo equipment in your trunk, your 15.01 @ 92 really isn't a bad time. How much would you estimate all of that stuff weighs, and did you remove any of it? It can make a pretty noticeable difference.

Just because one person gets a 14.7 with only a y-pipe doesn't mean that you will too. I know Dave B has mentioned this in another post, but all tracks are different. If you can run a 14.7 at one track, you might not be able to get below a 15.0 at a different track.


Have you dynoed your car at all?

 

the only advice i can give you is to work on your R/T. I say this because on one of your runs you have a 1.25~ reaction, i am sure that run could have been in the high 14's with a better R/T.

 

R/T has absolutely nothing to do with ET!!!

 

Pet peave?

 

well obviously RTs mean squat, you can sit there for 25minutes and still run a 14.5 , all they determine is your REACTION TIME from the moment the lights turns green and you move...And when i wanna get a kick *** RT, i can, got a .522 last week



anyways, 19psi is a bit low, but they provided the best and worst grip of the day. You have to remember, first im running on wrong sized tires, its what came from the dealer, small *** 205/55-16s, and they have a 540treadwear rating, their hard as rocks compared to my last tires on my old car (Yokos AVS ES100, great tires!) I tried lowering the pressure to about 25, they built up to around 28, lowered to about 21.5, and the built up to 24.5, so i just decided to go real low (19PSI), and low and behold, i had my best run IMMEDIATELY after that, a 15.01.


Also, i had my stereo removed , and i guestimate it weighs 60-70 (?) lbs, not to heavy. I mean i tried everything to get a better time, even removed my filter, lol, that yieled a .1 SLOWER time, consistently....

And quicksilver- theres no way it can really be my exhuast itself, ive noticed the downfall in power AFTER i installed the y-pipe. When i first installed it, i couldnt grip in first, i could floor it at any time in first and i would lose control a bit from lack of grip, yeah that doesnt happen now. I dont get that wonderful pull, all i get now is a rediculous rasping noise thats getting worse and worse, almost sounds like a damn air leak now coupled with ratting. I know its got to to with that damn y-pipe and i hope it does...


ill keep you guys posted since its getting looked at real soon

Oh yeah, also, has anyone had their Cat prematurely clog after installing the Y-pipe, since its letting more **** go to the actual cat. Just curious...

And another question, i noticed that when i was crossing the line on one of my runs, i saw the speedo well over 95ish mph, yet my slip said 91 and change, wtf? are our speedos that far off at that high of speed? I remember reading something that one of the org members said, saying that the max speedo is 3mph off??


eric

 

Yep.

 

Dude, that's what I'm talking about. Your Y-pipe is part of your exhaust now...so R&R it, make some more runs, then see if that helps.

 

qn[

 

Your 1/4 mile trap speed is averaged over the last 60' (I'm pretty sure it's 60 feet) so the speed on your slip will be slower than the speed on your speedometer. Plus the speedo is probably at least 2-3 mph fast at those speeds.


Go get your car dynoed and see what it's putting down to the wheels. I think that's the best thing you can do at this point. Either it's putting the power down or it isn't and there's something wrong, and a dyno will help to determine that.

 

not sure what the hell happend to this post of mine, but it was basically what stev said? lol

 

I am anxious to get my car dynoed too. Would like to see the A/F/R. That would be part of the dyno right?

 

theres no dynoes near me that i know of, i live in Spring Hill, FL 45mins or so north of tampa, anyone know of one near me?!


eric

 

Jacksonville, FL here

 

Something is wrong here, Maybe its a worn out injector or something. Get a tune up. Are you elavated at all, elavation=Slower times

 

AssyrianRicer id like to see you go to the track see if you can still beat that z28...

 

Was the humidity level high during your runs?

 

nope. Weather was great, got a lil hot toward the end of the day...



eric