My JZA70 Track Times

[The Amazing Spider-Man]

Last night I went to the track (LACR) to get some practice. Now i know I'm not the best driver so my number are probably not impressive. The only thing I have on my car is a bone stock 1jz (stock air box, exhuast ect) and Tein suspension. Before i went on the track i lowered my tire pressure to 30 and took out the spare tire. I raced a dc2 integra, an ek civic, a non sti wrx and an sti wrx twice in that order. I lost to all but but the integra. my times actually improved each time i went except for the last one. My times were never this good before. As for my reaction times and launch they are really bad. I was wondering if you guys could give me tips on launching. I tried a couple different techniques but i don't know if its right or proper procedure. I tried reving 2500-2700 rpms and easing of the clutch which resulted in slow take off. Then I tried the same thing but released the clutch quickly and slightly quick on the gas which resulted in wheel spin. I also tried reving 3000 3400 rpms with the same techniques but both ended up with wheel spin. Is there any tips or different methods you guys can give me to imrove my launch?

here are my numbers in the order i raced. my reaction times really suck. i really don't know what i'm doing.

dc2 integra
e.t. 17.1
r.t. .020

spider-man
e.t. 15.8
r.t. .792
http://i28.photobucket.com/albums/c204/jza7089/lacr1.jpg
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ek civic
e.t. 15.7
r.t. .119

spider-man
e.t. 15.5
r.t. .901
http://i28.photobucket.com/albums/c204/jza7089/lacr2.jpg
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wrx non sti
e.t. 13.9
r.t. .586

spider-man
e.t. 15.4
r.t. .733
http://i28.photobucket.com/albums/c204/jza7089/lacr3.jpg
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stock wrx sti (he said he just got it from the dealer)
e.t. 14.8
r.t. .596

spider-man
e.t. 15.0
r.t. 1.052
http://i28.photobucket.com/albums/c204/jza7089/lacr4.jpg
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same stock wrx sti as above
e.t. 14.8
r.t. .592

spider-man
e.t 15.8
r.t. 1.231
http://i28.photobucket.com/albums/c204/jza7089/lacr5.jpg
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15.0 is the best time i've ever had so far.

[bowsercake]

Easiest way to improve, probably one of the most expensive options as well:
http://www.mickeythompsontires.com/images/products/et_drag_radial.jpg

What kind of tires did you have in the back? Were they worn out? Poor tires can really hurt your launch.

[NA86.5]

:withstupi

[Big Wang Bandit]

Nice going!

Keep it up

Drifting, Drag racing.

Your a jack of all trades!

[lagged]

tired motor.

[Mr.PFloyd]

tired motor.
i was going to say terrible terrible reaction times!
edit. sawbladz kicked my ass on that one, but i was going to mention 60 ft times as well.
:icon_razz

[Sawbladz]

Reaction time does not count in your elapsed time for a test and tune session. His problem is seen if you look at his 60 ft times. They range from a 2.3 to like a 2.8. The launch is crucial and it looks like you just need more practice and more traction.

[Doward]

Dude, you almost got beat by a Civic. :D

Nice, though! 5 spd or automagic?

[lagged]

Reaction time does not count in your elapsed time for a test and tune session. His problem is seen if you look at his 60 ft times. They range from a 2.3 to like a 2.8. The launch is crucial and it looks like you just need more practice and more traction.

im no expert but i would have to say that in my opinion more traction will not help much.

look at his trap speeds, he never got faster than 95mph. if i got those kinds of trap speeds id probably do a compression test to see where im at with that motor.

[upgradedsupra]

Easiest way to improve, probably one of the most expensive options as well:
http://www.mickeythompsontires.com/images/products/et_drag_radial.jpg

What kind of tires did you have in the back? Were they worn out? Poor tires can really hurt your launch.

Best advice here thus far

A guy local here runs a 95MPH trap and ran a 14.1 on street tires. It just takes practice but with ET streets it will solve any traction problem and then you can concentrate on driving and times.

Duane

[SD2JZA70]

im no expert but i would have to say that in my opinion more traction will not help much.

look at his trap speeds, he never got faster than 95mph. if i got those kinds of trap speeds id probably do a compression test to see where im at with that motor.
Traction is what he needs. I was running low 14s with similar mph back in the day. Also LACR where he raced is high elevation, he would run about 2-3 mph faster at sea level.

[The Amazing Spider-Man]

Dude, you almost got beat by a Civic. :D

Nice, though! 5 spd or automagic?
5 spd and the civic did win :cry: .

so you guys are saying that my traction is my problem and that i should get better tires? my tires were kinda worn when i went. how about my launch technique, should i change it or keep it the same? and how does sea level contribute to drag? sorry i'm kinda of a noob when it comes to this. btw thanks guys for the responses and tips

[837m]

Thats not much better then my almost stock non turbo 86 that i used to have. You should be doing way better then upper 15s.

[roadwarrior87]

I don't know if you've looked at the thread on SF about this, but here's the link http://www.supraforums.com/forum/showthread.php?t=350429 Looks like some cool info. There is one here too!(edit: it's the same thread here too, check out the sticky in this section) Keep practicing :icon_bigg

[tissimo]

Tires will help some.. but the car is WAY down on power..

My 91 with the 7m (3 years ago) went 14.3 at 95 mph bone stock with upped boost (hit 10psi fell to 7).. Stock exhaust and intake..

[lagged]

Tires will help some.. but the car is WAY down on power..

My 91 with the 7m (3 years ago) went 14.3 at 95 mph bone stock with upped boost (hit 10psi fell to 7).. Stock exhaust and intake..

im with this guy, i think that motor is pretty shot. id start savin for a rebuild!

of course better tires, better driving technique will get you better times to a point, but as a starting point those times are terrible, and not exactly because of your driving, more because of the motor.

even if you had terrible traction and a terrible launch id still think your trap speeds should be higher... the car had a whole 15 seconds to get to the low 90s so, yeah.

my 7m did about the same thing, mid 14s bone stock.

[The Amazing Spider-Man]

so lacr's website says the track is 2710 ft above sea level and that you should multiply your time by .97 . that gave me 14.5, is that still too high? and what does sea level have in play with my times? it also said multiply your speed by 1.03 which gave me 96.4 mph is that any good? oh and what numbers should a stock jza70 be doing anyways?

[mattjk]

I'm sure his motor is fine. It has a stock airfiter, stock 2" downpipe and stock exhaust...

if anything, i bet his stock muffler is broken inside and is choking power.

[tissimo]

I'm sure his motor is fine. It has a stock airfiter, stock 2" downpipe and stock exhaust...

if anything, i bet his stock muffler is broken inside and is choking power.
could be.. get a better exhaust and replace the cat with a high flow unit and see what happens. The car deff isn't making very good power, roughly 250-260 hp at teh crank I would say..

[lagged]

so lacr's website says the track is 2710 ft above sea level and that you should multiply your time by .97 . that gave me 14.5, is that still too high? and what does sea level have in play with my times? it also said multiply your speed by 1.03 which gave me 96.4 mph is that any good? oh and what numbers should a stock jza70 be doing anyways?

the reason power goes down with higher elevation is because the higher you go, the less air pressure there is. this means the air is "thinner" with less oxygen. oxygen is what makes power so if you have less of it, the less power you will make.

the fact that you have a stock exhaust and were at a fairly high altitude were all factors playing against you.

if i were you though i would compression test the motor just to see where youre at. like i said in my first post, im no expert i was just stating my opinion.

unless you are planning on entering into some events, it dosnt really matter what times you get as long as you are having fun with the car that is all that matters!

[scottiedawg66]

are you doing a burnout? Save the burn out for drag tires if u are doing one, and like everyone else said id do a compression test, they are so easy on a 1jz, take no more than 1/2 an hour.

~scott

[The Amazing Spider-Man]

no i don't do burn outs. now if i do a compression test i want my compresion to be at 8.5 right? thats the stock compression isn't it?

[BigTree]

you are thinking compression ratio.

You want your numbers to be around 160 on each cylinder. I am not 100% sure of the number off hand but it should be higher than 140 for sure. All 6 numbers should within 10% as well.

You want something like this
http://www.kctools.com.au/images/TOOLS/TOOL%20JPEGS/TOOL%20JPEGS%20INC%20DESCRIPTION/08122%20COMPRESSION%20TESTER.jpg

The gauge threads into a piece that threads into your spark plug hole.

You want to warm up the car first to operating temperature, let it cool down for ~2-5 mins, remove all 6 plugs, disable your ignition system, than start testing on number one.

You should hold the gas to the floor and let the engine crank over about 5-6 times on each cylinder.

Something like that.