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Just Couldnt Get The Power Down

R33GOD

By R33GOD,
in Motorsport Discussion & Builds

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Yes it does. Depending on the track and dyno, I've got an pretty damn good "hit rate" on predicting ETs and trap speeds here. You guys just have weird reading dynos :ninja:

You guys use the Hub Dyno's... not the rollers :(

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Robo's Mentor

Robo's

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Yes it does. Depending on the track and dyno, I've got an pretty damn good "hit rate" on predicting ETs and trap speeds here. You guys just have weird reading dynos :(

Not exactly, considering a stock turbo R33 will max push 200rwkw, and you can easily run 106-107mph with this power. I say the dyno is high or the driver is shit.

some_cs_student Veteran

some_cs_student

Posted
Posted
Not exactly, considering a stock turbo R33 will max push 200rwkw, and you can easily run 106-107mph with this power. I say the dyno is high or the driver is shit.

Ok, here's one thing I'm not getting in these MPH vs RWKW argument, not saying you guys don't know what your talking about, I would just like to understand what your talking about :(

How does the MPH in the quarter mile compare to the RWKW (or AWKW) figure? Is that what your comparing?

Or are you looking at the MPH on the dyno?

I mean, if you got a really bad launch then wouldn't you not reach the same MPH?

2rismo Grand Master

2rismo

Posted
Posted
Ok, here's one thing I'm not getting in these MPH vs RWKW argument, not saying you guys don't know what your talking about, I would just like to understand what your talking about :)

How does the MPH in the quarter mile compare to the RWKW (or AWKW) figure? Is that what your comparing?

Or are you looking at the MPH on the dyno?

I mean, if you got a really bad launch then wouldn't you not reach the same MPH?

Although it's not 100% accurate, there is enough data logged from drag racers all over the world in various types of race machinery to make a pretty bloody good estimate of power when you know the weight of the car and the terminal speed in mph. In general, it would take about 320hp (at the flywheel) to propel a car weighing as much as an ordinary R33 gtst to 106-107mph. That usually equates to about the 250-260hp at the wheels or about 190-200kW.

A bad launch will always result in a slower elapsed time but will sometimes improve the terminal speed. Don't ask me why because I haven't been able to get a definitive answer yet.

rev210 Grand Master

rev210

Posted
Posted (edited)
I have no idea how you guys get those kinds of times, but they sound extremely unrealistic most places. I reckon a high 13 at ~103mph with 190-195rwkw and maybe a low 13 with MickyT drag radials would be a decent target with a decent driver etc in any tracks/dynos I have come to know.

1.81 60ft on shitty road tires just messes with my head - I have no idea what you did there. Are you running 90:10s etc?

What you reckon is basically attached to being unable to drive a faily slow car off the line at the drag strip.

Ask him (2rismo) how to drive a car off the line, actually go to the drags and talk to people who race. They are friendly and believe me getting a 8 second car off the line and down the track safely and worse trying to run in a bracket involves far more skill than the slow 12/13 second cars lots of guy punt around in. They will point you in the right direction in no time. Then you just practice what you get told. It's instant improvement.

I was at the drags a few weeks back not racing and talked to a couple of young blokes with skylines and helped them both lop half a second off their times with one conversation after they had been running the usual 'forum expected' times all night.

The lessons are usually short and mostly it just involves using the two ears on your head. Biggest problem with guys racing thier street cars is that they talk amongst themselves about how to launch a car, it's a pool of ingorance. And on this forum it's been that way ever since. I remember copping all sorts of flak when I ran 13.8 in a fairly stock gtst on 205's and even more when I ran 13.4 on the same tyres, I seem to recall you gave me some of that flak back then too? :)

Based on non-wanker power numbers

170-ish rwkw is enough for a high 12 in a gtst

190rwkw is an easy 12, simple as that. And proven to boot.

Now why don't people start asking how they can do the same thing?

Your mph says you have an 11 second car there, so the good news is theres plenty of time to lose from your 13.3 :)

Edited by rev210
some_cs_student Veteran

some_cs_student

Posted
Posted
The lessons are usually short and mostly it just involves using the two ears on your head. Biggest problem with guys racing thier street cars is that they talk amongst themselves about how to launch a car, it's a pool of ingorance. And on this forum it's been that way ever since. I remember copping all sorts of flak when I ran 13.8 in a fairly stock gtst on 205's and even more when I ran 13.4 on the same tyres, I seem to recall you gave me some of that flak back then too? :ermm:

Apologies for hi-jacking the thread, but is this something I could listen to with my eyes ? :D

Granthem Mentor

Granthem

Posted
Posted

Well i supposedly have 161.1rwkw. Thats a GTT, with cat back zorst, and slight boost (but had dropped off to .55 bar when it made this power anyway)

Im heading to the drags this friday, and will see what MPH i did.

For reference, with just the cat back it was only running 93ish mph. Time after time. And the car itself seems very healthy. Has anyone else run around that MPH for the same mod?

2rismo Grand Master

2rismo

Posted
Posted
Well i supposedly have 161.1rwkw. Thats a GTT, with cat back zorst, and slight boost (but had dropped off to .55 bar when it made this power anyway)

Im heading to the drags this friday, and will see what MPH i did.

For reference, with just the cat back it was only running 93ish mph. Time after time. And the car itself seems very healthy. Has anyone else run around that MPH for the same mod?

That sounds about spot on for a stocker.

Granthem Mentor

Granthem

Posted
Posted

Well hopefully i can pick this MPH up abit.

I have now got around .8 - .9 bar peak, and as the revs rise this drops quite hard. However, for most the the rev range I will still have more then stock boost, which hopefully in turn nets me a few more MPH at the end of the track!

Any estimates as to what MPH I might gain? (I know its a tough one but I guess im hopeing for around 96mph)

2rismo Grand Master

2rismo

Posted
Posted
Well hopefully i can pick this MPH up abit.

I have now got around .8 - .9 bar peak, and as the revs rise this drops quite hard. However, for most the the rev range I will still have more then stock boost, which hopefully in turn nets me a few more MPH at the end of the track!

Any estimates as to what MPH I might gain? (I know its a tough one but I guess im hopeing for around 96mph)

I reckon 97mph

NoFX_Hardcore Proficient

NoFX_Hardcore

Posted
Posted (edited)

I really think your 60ft time is where most people need to concentrate on because I managed 104mph in my r32 but only a 14.3 sec quarter... and i'd estimate the power would have been around 200rwkw mark

EDIT: and your gear changes... 3rd is always a killer.

Edited by NoFX_Hardcore
Granthem Mentor

Granthem

Posted
Posted (edited)

Nah tested my car then... only hitting .5bar in first. LAME.

Need a quick smart fix to happen before friday... the turbosmart single stage is sitting at home. Might rig that up

Hopefully it can hold the boost abit better, its still gonna drop, but right now im dropping back to stock

(and for those who want to know, right now ive tried to hold the wastegate shut for longer with springs lol)

I will be running Federal super steel 255/17s for these runs on friday, hopefully i can pull my 60ft down to close to 2

Any launch tips 2rismo?

Any idea how long you ride the clutch for in seconds off the line? how many revs do you launch from. im thinking around 4000rpm

Edited by Granthem
NoFX_Hardcore Proficient

NoFX_Hardcore

Posted
Posted (edited)

yeah hook that up. wouldnt take much to do. or goto autobarn and get a 50$ GFB bleed valve lol....works for the pig granthem.

otherwise, thought this might come in handy...

http://search.ebay.com.au/search/search.dl...&category0=

Edited by NoFX_Hardcore
NoFX_Hardcore Proficient

NoFX_Hardcore

Posted
Posted
lol the silvia didnt hold boost. It would peak at like 17 then just start the downward spiral lol

yeah but like i said, it was coz the bleed valve itself was f'd... and probably the turbo hahaha.

when i first bought it it held quite well. especially between 7-12psi.. i reckon visit my link and do it proper.

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