So i went to orlando speed world last night. The weather was bad. I got one run in then the rain started...so everybody went home. I had my tires to about 18psi. What happen was that the system was autostart off. orlando speed world is fixing the place up for a big world wide upcoming event. Anyways i got really confused when i seen no guy... As soon as i stage the light hits yellow yellow and then for whatever reason i nail it and pop the clutch out at 4k. I spun all the way through first. O and my buddy was in the car too he weighs around 220 and i weigh like 120. The car is 100% stock 5 speed on shi* street tires. 215 60 15. 1995 with 265,000 miles. orig. engine and trans.

R/T... .442
60'... 2.312<<< that was amazing after so much spin. I guess the 18psi helped.
330... 6.602
1/8... 10.111
MPH... 69.74
1000... 13.136
1/4... 15.669
MPH... 87.28

 

bad knock sensor?

 

A bad knock sensor would have gotten you even worse numbers. Your knock sensor is fine, lose the passenger and practice your launch and you'll get some low 15's easily.

Oh and try 24psi in the front and 40 in the rear. Don't do any burn out unless your forced to go threw water, if so just do a quick chirp to get the water off.

 

Yea the car was hot because i was hauling a** because its far and they closed at 10pm... and as soon as i came the lanes moved fast. I know how to launch the car it was just an accident.

 

not really i rana 15.2 with a bad knock sensor and a slipping clutch.

 

I got an egr code but that has nothing to do with it....right?

 

It couldn't have been that bad because I have had personal experience with a bad knock sensor and it knocked over a half second off my time and it knocked a second off of a buddy of mines time.

 

yes it was that bad . at idle it was pulling timing out and you could feel it.

 

Whatever, I just know from my personal experience and a few others that changed there's and dropped a half a second or more by changing it out. I went form a 15.8@87 to a 15.0@90 just by changing the knock sensor.

and I never felt it actually pulling timing, but did notice a loss in topend.

If I was him I'd change for the hell of it because its a 60 dollar part and relatively easy to do.

 

But I have no ks codes. I ran so bad because of the stuff that happend. I am pretty sure if i got a couple of more runs in it would be better because second wasent really a good shift since the rpm flew up because of wheel spin. But if i go back and i run shi* times then yea ill change it.

 

Easy to change? Yea not really . If it was that easy i would have changed it before i went boosted but instead i waited till i blew the motor so i could put the new one in the motor going in the car. Im not arguing that a bad ks wouldnt give him bad times as i knocked half a second off when i finally did change mine i just said that i ran a 15.2 with a very bad one thats all.

 

Took me 15 minutes to change mine. You just need small hands.

 

You don't need a code for a bad knock sensor. If you have a 200,000 miles and never changed it then you should just change it. It can only help and is only 60 bucks on ebay for a oem one.

I also agree that you can do better on the launch, lose some weight, and let the car cool down some.

Good luck and be sure to let us know how you do next time you go. You should also have some cooler temps to, which will also help with some better times.

btw you should also raise your tires up to about 22-24psi, because 18 is going to kill you trap speed.

 

Well guys thanks for all of the tips. I will post the times if i go to the track again. The last post really helped me understand why my trap was so low. If i had it at 24psi with a good launch that would result in a better time and not just trap speed right?

 

From MY personal experience on street tires 24 psi in the front and 40 in the rear seems to net me the best of both worlds(60ft and trap speed)

Now others will say lower, but you tried it and only netted 2.3's and a 87mph trap, which is low and was probably caused by your low tire pressure.

If all this doesn't help then I would definitely look into the knock sensor.

be sure to post up your new times.

 

Oh and on my turbo sentra I run my 185/55 14 street tires at the same numbers I just told you and get low 2.1 60's all night long and I have about 250whp.

 

do you really believe that one single run is sufficient data the determine that the tire pressure he used is the cause of his low trap speed and poor 60' time? that's a heck of an assumption.

 

NO, but 18psi is to low for street tires and it WILL kill your trap speed and bog and kill your 60ft IMHO. I just gave the guy some PERSONAL advice.

I have been going to the track for over ten years now and have a pretty good knowledge of drag racing and I am not calling myself a pro, but I am experienced enough to give some advice.

 

I've run street tires as low as 14psi and saw no drop in my trap speeds. 18psi will not drop your trap speeds in the slightest - in my opinion - and certainly would not drop them a full 2-3mph from where they otherwise should have been (considering the fact that he had a 200lb passenger with him, 89-90mph seems like a reasonable trap speed to expect from an average driver.)

 

I am trying to give the kid some useful info but keep getting side tracked. 15-18psi on street tires will hurt your trap, I've tried it many, many times on all different types of cars with the same results LOWER TRAPS and i already said get rid of the passenger first.

Disagree if you want, but let him atleast try it. If it doesn't work for him then let him go back down to a lower psi. I am done with this.


oh and 200lbs is not going to give him 3more mph in trap speed, he trapped at 87.2 when he should be trapping atleast 90+

 

I do not disagree that he could try raising his tire pressure, I've never found a reason to have street tires that low - it doesn't help your 60' on street tires imho, in fact the only time I bother dropping them is if I'm getting wheelhop because it does tend to help with that. I will continue to disagree that the cause of his low trap speeds is his tire pressure because it simply hasn't held true for me. not one iota. you are giving him false hope in that regard.

A 220lb increase in weight is just about exactly 3mph according to my timeslips actually, since I've actually run down the track with a guy who weighs about exactly that in my car. 90 or 91mph is all I'd expect out of a bone stock 4th gen in crappy weather. better weather and he'd get maybe 92mph.

I don't think his run is out of line with what I'd expect from your average first timer in a high mileage maxima with an engine that might be a little tired. he loses the passenger and loses a tenth off his 60' and he's knocking on the door to 14s I'd say. a few more runs at the track to analyze would help refine that prediction. one run is hard to tell because anyone can have a bad run on their first trip down the track.

 

Then I think we do agree on basically everything. I did tell him to ditch the passenger first and THEN raise the tire pressure up. This should net him the proper trap for a 4gen.

Now are we OK??

 

we were never not ok man, everything's cool on this side of the fence.

 

Cool....

 

Not everyone is you Neal lol. Im playin.