Drag On Saturday Willowbank

[bazr33]

Saturday, i managed to get down to the track with a group of guys that hired it out

Had a few fair runs down, and couldnt quite manage to get into the 13 sec bracket

The only problem i can see that is restricting me to this is my tyres and traction.

At the moment i have 225's street tyres

my starts felt fairly slow, due to trying not to spin the wheels And lack of revs so it wouldnt spin.

Best time i could get was a 14.2

Best 60ft was a 2.2sec

Best 660ft 9.1sec

1000ft 12sec

Best mph was 102.

As not having alot of experience at the drags, im still gettin use to when my best shift points are

And when its not making anymore power at certain revs .

I DO know that i need either slicks or wider tyres to gain some traction and some quicker starts.

But i think my main issue is my starts

My mods are

Power fc

AVCR

FMIC

Walbro fuel pump

Hiflow r33 turbo (plain bearing, 270 thrust bearng) 12psi

3" exhaust

CES Racing split dump

And thats about it, everything else is stock

At the moment i am up for new injectors, AFM and a fuel regulator.

as my injectors and AFM are close to maxing out.

Any advice or information would be appreciated.

[BezerkR32]

Mickey Thompson ET Street Radials 255/50/16 will pick you up 1/2 a sec in your 60 foot time.

Saturday, i managed to get down to the track with a group of guys that hired it out

Had a few fair runs down, and couldnt quite manage to get into the 13 sec bracket

The only problem i can see that is restricting me to this is my tyres and traction.

At the moment i have 225's street tyres

my starts felt fairly slow, due to trying not to spin the wheels And lack of revs so it wouldnt spin.

Best time i could get was a 14.2

Best 60ft was a 2.2sec

Best 660ft 9.1sec

1000ft 12sec

Best mph was 102.

As not having alot of experience at the drags, im still gettin use to when my best shift points are

And when its not making anymore power at certain revs .

I DO know that i need either slicks or wider tyres to gain some traction and some quicker starts.

But i think my main issue is my starts

My mods are

Power fc

AVCR

FMIC

Walbro fuel pump

Hiflow r33 turbo (plain bearing, 270 thrust bearng) 12psi

3" exhaust

CES Racing split dump

And thats about it, everything else is stock

At the moment i am up for new injectors, AFM and a fuel regulator.

as my injectors and AFM are close to maxing out.

Any advice or information would be appreciated.

[2rismo]

Mickey Thompson ET Street Radials 255/50/16 will pick you up 1/2 a sec in your 60 foot time.

...AND 1 - 1.3 seconds off your ET.

Incidentally, 306hp and 102mph don't match up. Don't put too much stock in dyno figures.

Adrian

[bazr33]

yeah i think the reason for the 102mph

is my starts, werent too crash hot

And with mickey thompson street radials i reckon i could pick up a sec with the starts i was doin, and still learning my best shift points.

Next time i go out, i'll try my 235's. see if i can scrape into the 13's

Thanks

[2rismo]

yeah i think the reason for the 102mph

is my starts, werent too crash hot

Your start makes almost no difference to your TS.

[HR31_RB20DET]

Also don't forget that when you were racing last Saturday, track temp was between 40-42, when out there on Saturday night just passed, temps were 20 degrees cooler, so that would be effecting your MPH a bit.

[bazr33]

yeah i had 95 octane fuel in my car from 7 eleven

could of got some shit fuel. And yeah it was fairly hot that day

Ijust took my car for a spin and put in some optimax

feels much quicker to get through the rev range, gets up and goes with the cooler weather

might even go to next test and tune and give it a run with my 235s on.

2rismo, could you please tell me whats the best way you know to launch with 235 street tyres.

Is there any point in dropping the tyre pressure on street tyres?

I did try havin the handbrake half up and clutch half out and bringin revs up and found it was workin a bit betta then just bring the revs up and slowing takin the clutch off to reduce wheel spin.

What revs should i bring it up too?

I also got to find what revs i should be shifting at, and when its not making anymore power. ( i think my shift light is set at 6000 or 6200 at the moment, but it does rev right out to 7300.

Thanks

[Pal]

Bazr33, you should be getting way more than that, my PB is a 14.08, with a shitty start and axle tramp and im only runnin 190rwkw. better chuck on some better tyres and what that time drop well into the 13's. good luck

Edited May 29, 2006 by Pal

[gtr660hp]

Go A set of slicks-ET's are good

should be pumpin out 13.2@108mph then

[bazr33]

yeah on my stock turbo on 12psi

i managed a 14 flat, i had my 235's on the back then

then put the hiflow on and i bought stock r32 gtst rims

and put 225s on them

so i'll have to give that ago .

within 2 months time be puttin the boost to 18psi

[bazr33]

put my 235's on and managed a first run of 13.7

60ft was 2.250

and mph was 105

so the colder weather, bigger tyres and 98octane fuel helped

again i was very slow with my launches, cause i thought my wheels would of spun. and only got two goes, cause there was alot of ppl there

so more practicing it looks like

Edited July 30, 2006 by bazr33

[TurbostyleR]

Your start makes almost no difference to your TS.

you cant be serious with that statement?

YOU of all people!

[MrBlonde]

you cant be serious with that statement?

YOU of all people!

Your short time has almost no bearing on your trap speed. Trap speed is all about how much power your engine is making on that track at that time. Your 60' time is about a whole host of things, including driver skill, rubber, suspension setup, track condition, etc.

[2rismo]

Took the words right out of my mouth, Kenny. I have run identical, (not close, not near enough) IDENTICAL terminal speeds with 60' times different by .5 of a second.

The jury is out on whether to drop tyre pressures for street tyres. Some people say drop em a bit (me included) and some say leave them as they are. What most people agree on is that performing a nice, long smokey burnout is pretty pointless. Get the water off of them, maybe a bit of smoke if you're keen and that's it. Street tyres tend to perform worse when smoked to hell.

The things that have made the most difference to my times are:

1/ Practice

2/ Tyres

Forget power, torque, dynos, "but my mates car does...", heresay, factory figures, forums, guestimates etc.

The best way to improve your times on a street car is practice and purpose made tyres.

Adrian

[benm]

Your short time has almost no bearing on your trap speed. Trap speed is all about how much power your engine is making on that track at that time.

Doesn't matter how many times I read this I still do not believe it.

Take 2 100% identical automatic cars with identical power/torque/accelleration etc, driven by 2 identical robots.

Car A starts at the starting line (400m total)

Car B starts 50m ahead of the starting line (350m total)

Which car will have the higher TS? Car A - longer distance to gain higher speed = higher TS.

Now if both car A + B start side by side at the starting line and Car A has a 1sec 60ft and Car B has a 2sec 60ft it means Car B is going at a slower speed than Car A with the same distance left to travel .

Noting this, how can Car B (being identical to Car A) possibly get a higher TS than Car A when they both have identical power/torque/accelleration etc?

[MrBlonde]

Doesn't matter how many times I read this I still do not believe it.

Take 2 100% identical automatic cars with identical power/torque/accelleration etc, driven by 2 identical robots.

Car A starts at the starting line (400m total)

Car B starts 50m ahead of the starting line (350m total)

Which car will have the higher TS? Car A - longer distance to gain higher speed = higher TS.

Now if both car A + B start side by side at the starting line and Car A has a 1sec 60ft and Car B has a 2sec 60ft it means Car B is going at a slower speed than Car A with the same distance left to travel .

Noting this, how can Car B (being identical to Car A) possibly get a higher TS than Car A when they both have identical power/torque/accelleration etc?

Neverthless real world experience shows it to be true. My best short time and my worst short time have the same trap speed.

Do an experiment. Do a full on pass with your best launch. Then on your next pass, break the beams and wait. Then go for it. Your trap speed will be the same.

[1JZ.747]

Doesn't matter how many times I read this I still do not believe it.

Take 2 100% identical automatic cars with identical power/torque/accelleration etc, driven by 2 identical robots.

Car A starts at the starting line (400m total)

Car B starts 50m ahead of the starting line (350m total)

Which car will have the higher TS? Car A - longer distance to gain higher speed = higher TS.

Now if both car A + B start side by side at the starting line and Car A has a 1sec 60ft and Car B has a 2sec 60ft it means Car B is going at a slower speed than Car A with the same distance left to travel .

Noting this, how can Car B (being identical to Car A) possibly get a higher TS than Car A when they both have identical power/torque/accelleration etc?

that is not relevant i hate to tell you,

both cars have 400m to cover, same scenario but one car smokes the tyres to the 100 foot mark it wont make a difference. 50m of track will cause a difference as he is 50 meters ahead with no inertia.

real world examples show it for me, kenny, buster, adrian.

another example would be my best mates vl turbo, the fastest SOHC in NSW.

he ran his highest MPH at the old eastern creek track which was up hill, smoking 205/50/15 simex street tyres to half track he netted a trap speed of 134 mph and a 11.8 et

same car, same tune same driver, trans brake start on slicks ran a 10.01 et at 133 mph.

simex were 26 inch tall

slicks were 28 inch tall.

[benm]

I realise what you guys are saying, i've seen it happen many times in my 10yrs of drag racing spectating.

At the end of the day drag racing is all just a big maths equation, with the primary equation being Speed = Distance/Time (or in our language - MPH). A shorter distance gives a slower Speed (MPH) provided that Accelleration is kept equal.

Edited August 2, 2006 by benm

[TurbostyleR]

Sorry I disagree with you guys here on this one.

the thing about turbo cars is their inconsistancy, BUT from personal experience everytime I have gone to the track my best mph has always resulted from a better 60 foot. (Take no note of my signature as those times and TS have resulted from different power levels)

I totally agree that power dictates your terminal speed, however your 60 foot does come into play. Especially when you have a big turbo that lags...

From personal experience, If I launch and fry the tyres in first, and second and pick third the car usually bogs down as it doesnt have enough speed and rpm for the turbo to make boost and therefore I have significant lag time in that run hence less distance to get my trap speed up..

Mr. Blond, your scenario also has no relevance to 60 foot times.

Just a quick addition my track times for the last few weeks:

5.7.06

Time 1:

13.4@114mph - 60 foot 2.7

Time 2:

12.6@121mph - 60 foot 2.2

19.7.06

Time 1:

12.8@117mph - 60 foot 2.4

Time 2:

11.8@119mph - 60 foot 1.8

Im always going to say that a better 60 time SHOULD net you a better TS. Im not saying it will always do it, but it should do it.

Edited August 2, 2006 by TurbostyleR

[1JZ.747]

Sorry I disagree with you guys here on this one.

the thing about turbo cars is their inconsistancy, BUT from personal experience everytime I have gone to the track my best mph has always resulted from a better 60 foot. (Take no note of my signature as those times and TS have resulted from different power levels)

I totally agree that power dictates your terminal speed, however your 60 foot does come into play. Especially when you have a big turbo that lags...

From personal experience, If I launch and fry the tyres in first, and second and pick third the car usually bogs down as it doesnt have enough speed and rpm for the turbo to make boost and therefore I have significant lag time in that run hence less distance to get my trap speed up..

Mr. Blond, your scenario also has no relevance to 60 foot times.

Just a quick addition my track times for the last few weeks:

5.7.06

Time 1:

13.4@114mph - 60 foot 2.7

Time 2:

12.6@121mph - 60 foot 2.2

19.7.06

Time 1:

12.8@117mph - 60 foot 2.4

Time 2:

11.8@119mph - 60 foot 1.8

Im always going to say that a better 60 time SHOULD net you a better TS. Im not saying it will always do it, but it should do it.

manual?

ever thought about the fact you may have f**ked up a gear change.

manuals are whole different story

example

my car 3440 pounds 490 rwhp trap speed 130 mph 10.5 et with street tyres

next car ra23 celica, same engine same turbo same power output but his is manual

he weighs 350 pounds less than me, that good for 3.5 tenths of a second he runs 10.46 130 MPH on slicks

we both sixty footed at 1.54 he changes gear slower then me hence part of the difference