Scoobynet Drag Strip Leaderboard!
13 March 2016, 10:03 PM
#391
Unmapped 12.4s @ 105
iTrader: (29)
Join Date: Apr 2005
Location: Newcastle. 330bhp-289lb/ft @ 1bar boost - 12.4s @ 105mph
Posts: 11,776
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Trust me to listen to others. Shame on me.
13 March 2016, 10:07 PM
#392
But yes you are 100% correct, holding revs does not work. Any muppet knows that.
14 March 2016, 12:13 AM
#394
Scooby Regular
Thread Starter
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.
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.
14 March 2016, 12:15 AM
#395
Scooby Regular
Thread Starter
and this is another goal ticked off the list...
I've had to wait a long time to post it!
Last edited by RS_Matt; 14 March 2016 at 12:17 AM.
14 March 2016, 09:21 AM
#400
Scooby Regular
Thread Starter
14 March 2016, 09:24 AM
#401
Scooby Regular
Thread Starter
14 March 2016, 10:01 AM
#404
Scooby Regular
14 March 2016, 10:27 AM
#405
14 March 2016, 10:31 AM
#406
Scooby Regular
Thread Starter
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.
14 March 2016, 12:56 PM
#407
Scooby Regular
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.
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.
We all think we're John Force, but drag racing is a far harder discipline to master than many think.
14 March 2016, 01:25 PM
#408
Scooby Regular
Thread Starter
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.
14 March 2016, 02:44 PM
#409
Scooby Regular
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 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.
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.
14 March 2016, 03:18 PM
#411
Scooby Regular
Thread Starter
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.
14 March 2016, 03:30 PM
#412
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.
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.
14 March 2016, 03:34 PM
#414
14 March 2016, 04:00 PM
#417
Scooby Regular
Thread Starter
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).
14 March 2016, 09:59 PM
#420
Scooby Regular
Thread Starter
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