Oops. I was just relaying what Andy Forrest and Steven Darley both told me to do. They both obviously need to start asking Matt for advice.

Trust me to listen to others. Shame on me.

 

You should know better.....

But yes you are 100% correct, holding revs does not work. Any muppet knows that.

 

How about launch control...sure mine has a cyclic rev limit that creates boost but could be wrong...I dont use it often

Infact last time I didn't use it I got a 12.5 in my STi

 

Different strokes for different folks. If you have shorter ratios and more torque (especially in a lighter car) then launching at high revs will end in big wheelspin.

I've watched Forrest launch and I suspect he's running very long ratios to launch at the revs he does.

If I launch lower than 4500rpm this happens every time. My turbo doesn't spool until 3800 which doesn't help.

 

TBH you don't have long to hold the revs when you stage and I'm not letting the other lane leave me!


and this is another goal ticked off the list...



I've had to wait a long time to post it!

 

Amazing what you can get printed up these days....

 

lol.

 

That cat thing was on the telly last night.

 

I think k you missed the point of rwyb.....

 

I've been saying he's gonna be a record cat from him being 12 week old!


....people never believe me though.

 

I enter Ultimate RWYB which puts cars into classes and you get a leaderboard printout that's updated every run.

It's certainly better for the FWD guys.

 

Another thread ruined but suppose its good for site traffic....

 

I think with how crap the UK roads are getting drag racing is finding a new audience. Chevet Lane is horrendous.

 

I need 0.07 to go from a 10 second 1/4 to a 9 second 1/4, trust me 0.7 is the earth in 1/4 mile terms.

 

Bow down to matts superior 1/4 mile knowledge. We can never compete, don't even try!!

 

Yes, that's true but at the other end of the spectrum something like going from 15seconds to 14.9 is absolutely nothing at all, as I suspect you know, maybe a slightly later change up or change in wind direction.

For me personally I think the big power hikes are needed at around 11.5 or less.

I've gone from 14.5 1st run to 12.6 last run without drastic modifications. 48bhp, harder launch and around 15kg in weight saving! I suspect 12.6 to 10.7 would need another 300bhp and complete changes to the engine and transmission.

 

A fair part of that will be purely learning to drive too.
We all think we're John Force, but drag racing is a far harder discipline to master than many think.

 

It's easier in mildly tuned cars too!!! I often post vids of 500bhp STi's running 12-14 secs, jesting how slow they are but there is a fine line at those power levels between wheelspin and bogging down, and they ultimately get low 11's by the end of the day.

It's weird how it all works, you notice things. I remember Andy Forrest getting quicker and quicker ET's but slower and slower terminals and I couldn't work it out for ages.

I realised as the day goes on your oil is getting thinner but heatsoak is getting predominantly worse. So you're getting a little less friction for pulling away but a loss in power for top end. There probably other factors too such as tyres getting warmer with the PSI rising and just the day growing generally warmer so air thickness drops.

 

It's about having more time to accelerate in the distance meaning a higher terminal speed for slower ETs. So for instance you may be slow over the first 1/8th due to a poor launch, fluffed change, too much power too early meaning you're losing traction even at half track and then make it up top end with bags of power.


You can then sort out the issues, get a cleaner launch, no missed changes, full traction all the way down the strip and arrive earlier meaning you had less time to accelerate the mass and therefore a slower terminal.

Unfortunately our local RWYB doesn't do 1/8th mile timing because I'd have liked to have seen the data for that on my 10.06 run. My 60ft was crap at 1.80 seconds as the surface is poor at best but I suspect after that it was actually quite good at the 1/8th and stronger from there on in as the nitrous came in from 3rd gear onwards on that setup.

 

Matt if you want to experiment with rev launching...if the car is bogging down put more air in the tyres....if it's wheel spinning let some out, basics really

 

I don't think spin will be an issue for me when I next go, I'm not going if it's rained though!

The 0-60 foot seems to be in and around 1.8 for Subarus from 280bhp to 700bhp that don't run drag tires and are launched more or less to the best of their ability.

I think MickyWRX got a 1.7 and has less power than myself and Martyn's Rocket.

They say most of the time is made up in the launch but I guess it's not that true with most perfectly launched Subarus matching each other to I guess 40mph? I know some will say a 500bhp+ STI hasn't been launched to get a 1.8 but they won't take into account that cars with that much torque and stock tires will need to ease off the throttle a little to get the same traction as a 300bhp STI that is being launched at the limiter. I guess a 700bhp STI would spin a little after engaging 2nd too where a 300bhp STI probably will have no issues. I see a lot of drivers of big bhp Subarus fluffing 2nd gear too as it's harder to get a perfectly timed change when the revs go towards the limiter so fast.

 

That's why you buzz the limiter twice, it reduces wheel spin

 

what's that?

 

Let's the drive train catch up with engine speed giving you a better change into 2nd reducing wheel spin.

Mainly applies to fwd applications but works on 4wd if you have enough power to spin the wheels

 

JG, does your clutch slip a little when you change gear rapidly?

 

No not at all...

 

My clutch doesn't slip in the classic sense, like revs rising when floored in 5th at 30mph, but I do get the telltale smell when I change to 2nd or 3rd fast at high revs (without launching).

 

True, but, I also kicked the living **** out of my car that day.

There was no way I was letting someone with and extra 500cc's and 110BHP beat me.

 

I did a 1.7 on my road tyres and road pressures without my suspenion in "drag" mode....

My car ha done a 1.4 before

 

That's 0-60mph in around 2 seconds, you can now see why my claim of 3.0 seconds without your traction/gear change worries isn't so absurd!

In fact I've just been on two 0-60ft calculating sites and a 1.4 second 0-60ft means you are travelling at circa 58mph after 1.4 secs!

http://users.erols.com/srweiss/calc60mp.htm

http://ls1tech.com/forums/drag-racin...mph-times.html