Rick

Chrisitian, ive said this before - ur car is geared up, and as u are still crossing the line in 4th, it will be slower then std gearing. It's simple. All gears are a multiplting factors of the engines torque. Ie in first u have over 3 and a half times the torque being delivered to the wheels than in 4th. As u have higher ratios, u have less torque in a given gear than a std rst

Anonymous

I just changed my gearing and did a 0-100 in 8.9 rather than my last of 9.8.

My gearing has made the car slower off the mark, not faster.

Simple maths really.

Mass, distance, accerlation, velocity......and an algorithmn - use www.google.com

Grip has an issue but if you have x amount of power then u will normally hit the terminal speed eventually. Might take a few runs, but you do get it....Unless you either aint got the power claimed, you have concrete in the chassis or you can't drive for shit.

My last 3 runs @ pod were crap but then i had no drive over the line, and was doing max in 3rd minus 2 secs really where i was fightin with the box.....terminal was 99-101 mph - yet i have done a 8.9 0-100 when i had the gears...

If you wheel spin then it makes little difference if you have power.

Example - mine on low boost 1st and 2nd, no wheel spin really high boost 3rd etc and it used to do 13.3/4/5 all day.

high boost and wheel spinning did 12.8/9 to 13.2 all day......terminal speed was all the same ish - 116-119mph 330bhp, which when you look at oli's with 320 and 114/5 terminals then it makes sense.

Oli's car is lighter than mine also.

Mike Rainbird

iTrader: (3)

Christian,
Because previouslyI had three gear changes (each estimated at costing 0.25 - 0.50 secs), when I had the taller gearing that slowed the acceleration of the car down, I only had two gear changes, so this offset the time and I was still doing my normal high 12s / 111-116mph terminals.

Karl,
Well I agree that aerodynamics is yet another factor that plays a role in this. However, with the light-weight comes the additional problem of putting that power down to the ground, so this could be why the teminals are similar . However, you will find that the terminal speed WILL increase if the traction remains good with a subsequent increase in power to weight ratio . However, in the real world (without a purpose-built drag chassis / set-up), an increase in power to weight gives a similar decrease in traction .

As has been hinted at earlier with Tim's car, increase in power to weight doesn't always give an increase in ET even if the terminal speed is improved. As an example, when I went from 385bhp to 420bhp, my terminals went up by a few mph from 112-115 to 117-119, but my ETs went down to an average of 13.1-13.2 instead of 12.8 to 12.9. This was all due to the time lost over the first 60 ft, where it was impossible to balance the wheelspin / bog effect created by the 0.63 a/r turbo compared to the ease of launching the 0.48 a/r item.

Anonymous

Mike, my times were better with a 0.63 t34 than a .48 t3 mate....both on greens.

60ft better to

Shings

Christian 2.1 60ft is very good... from memory Andy Nichols and the maestro (which lets face it in an ideal world we'd like to beat him) used to do 1.8/1.9's

Which is fucking awesome for FWD

On comparison- my only trip to the pod on the death run (pmsl) I was usless and got 2.4's 60ft and 103 terminals with 15's and Karls old 3 door tyres... really shite- engine wasn't right hence taking it apart etc.

Will be back for the last RWYB of the season hopefull

J

Rick

shings, what was wroing with engine - were things worn?

Shings

yeh it was just tired really a few things needed setting up and just generally needed a bit of money spent on it- Tim didn't know when he sold it and Chad never drove it so I wasn't arsed really....just one of them things.

Compared to when Tim had it however its fucking awesome- a lot faster now. Which is funny to say cuz it wasn;t ever slow

J

morpheus1967

Surely all forward motion is done by power to push some thing forward.
So more power more speed.

Less Weight More speed.

Less drag more speed.

Thats how i understand it all anyway.

Tim

iTrader: (1)

2.3 was my fastest 60 ft if i remember right ,if you look at the slip against christian its obvious that his gearing rev limiter plays a big part as my car pulled constantly away down the strip by 1/8th i had gained 8 mph and 1 sec on him so i would guess that, a/ his limiter was way too low and this exaggerated the longer gears.
Too be honest a high rev limit and longer gears may well be a good compromise there are no easy answers i recon its a trial and error thing ,as you have good front sus (same as i will be fetching ) so im told there are things you may well try.
Oh and it looks that you made progress with better times sunday think about what you done to make improvements.(and tell me only)

Shings

Tim- I am also fetching some proper bo bits for the front too