[misc_work] Still Nothing To Do With 205's...

[Rippthrough 98]

Keeps me entertained, springless front suspension this winter for the buggy I think.

[Rippthrough 98]

Well, times and results have just come through, and if we hadn't abandoned the second stage and nipped back into service to change coils, we could have had 4th place even with the engine playing silly buggers.

 

Doh!

[Rippthrough 98]

Actually, if my maths is right, we've won the 2wd championship again, looks like nobody can catch us now even if we stay at home for the next 2 events

[Cameron 16]

Nice one!

 

Are any of your events daan saaf? Would be cool to come and have a nose round!

[Rippthrough 98]

That one at sevenoaks was about the closest to you, next one is Minehead, then ooop north.

[Rippthrough 98]

In the hope of sorting out the munching coils issue, there's a set of D585 coils on the way from the 'states, they're a lot more powerful than the stock mazda coils, but more importantly, the components are rated for a higher ambient temperature (120*c instead of 85*) and they come with their own heatsink on the ignitors to help with cooling.

 

Should help with coil life, they're a damn sight cheaper too, bought 8 x D585's for less than the price for 4 Mazda OEM coils.

Got some rewiring to do to make them fit, and need to make some new ends for the Magnecor leads, and some tweaking to the dwell tables in the ECU to charge the new coils for longer.

 

Fingers crossed!

Edited September 8, 2011 by Rippthrough

[Rippthrough 98]

Shiny new leads, beefy coils and new wiring, hopefully should stand up to the heat and abuse a bit better than the Mazda ones!

 

[Rippthrough 98]

Found quite a neat car simulator last night:

 

205 GTi vs Buggy

 

Mud tyres modelled on the buggy if you're wondering about the slow start.

 

Edit:

 

VS T16 is quite interesting:

 

http://www.vimulator.com/#/v3/drag/2055+12089

Edited September 23, 2011 by Rippthrough

[welshpug 1,621]

interesting, what the hell do you put on the engine page when creating a car?!

[Rippthrough 98]

Yeah, took some working out that.

 

First one is rev limit (labelled as such), and then they go down in columns for the torque figures, starting at 0rpms and going up in 500rpm steps.

 

So, if you had a 3000rpm limiter and a completly flat torque curve, say 100lbft, from 0rpm to 3000, you'd have:

 

3000

100 <0rpms

100 <500rpms

100 <1000rpms, etc

100

100

100

100 <That's 3000rpms

100 <The program interpolates, so you need an 'extra' entry 500rpm after the limiter)

Edited September 23, 2011 by Rippthrough

[Rippthrough 98]

Oh, if you link just to the buggy it gives you the traction/torque/power, etc too:

 

http://www.vimulator.com/#/v3/sim/12090

[Rippthrough 98]

Fixed the engine!

 

Broke the gearbox!

[welshpug 1,621]

vandal!

[Rippthrough 98]

Yep!

 

We were slithering up this wet grass side-slope:

 

 

That bloody slippery we were at 6krpm in 3rd on half throttle and still spinning the wheels up, me hanging onto a fiddle brake and Ed on opposite lock trying to keep it pointing toward that corner, the inside wheel was probably doing about 3-4 times the speed of the outer one and it appears one of the spider gears objected to being abused like that for 20 seconds or so and picked up on a shaft and snapped it

[Rippthrough 98]

Hmm, not the spider gears as expected, but still the diff:

 

[Rippthrough 98]

[Rippthrough 98]

Arrrgh, spare gearbox in, test run, stuck it in reverse and it jammed there and won't come out. Engine out again... :cry:

[Rippthrough 98]

Engine out, gearbox apart, 5th gear synchro/selector was worn just enough to move ~1mm on the shaft and jam the whole selector mechanism.

 

Put a 45* bevel on the edges of the selector to help if anything similar happens in future, and 5th gear/selector and it's fork are on the bench looking lonely

 

Gearbox back together, engine and box back in, radiators back on, fluids refilled and bled, test driven, works beautifully.

 

4-speed gearbox now, it's lighter, might go faster

[Rippthrough 98]

Right, after a very rough event at Kirton today, we've managed to claw a couple of places back and end the year 8th overall in the Championship, albeit after battering the skid pans to death, punching two holes in the floor, cracking the windscreen on a hard landing and hitting the engine skid pan hard enough to dent it the whole way across and put a dent in the sump too.

Oops.

This stand-in engine was feeling decidedly unhappy towards the end of the day too tbh!

 

 

Writeup later!

[joey21 0]

Just read through the thread, looks wicked! How often do you actually get to use it?

[Rippthrough 98]

We generally race once a month + a few trackdays through the year.

[Rippthrough 98]

Mocked up the new front arms tonight, 4" of extra travel:

 

[welshpug 1,621]

is it a trailing arm torsion bar thing?

[Rippthrough 98]

Yeah, it's all all VW beetle-based suspension, trailing arms all around. Handles like it's on greased tyres

[Rippthrough 98]

5 degree's of static negative camber, 7.5 to 16 degrees of castor (varies with travel), 4 inches of extra travel, 1 inch less scrub and 2 inch wider track

 

 

Old arms at the top!

Perspective skewed a bit as there's a lot more droop on the new arms in that picture.