SUSPENSION - Recomendations

[Mavros]

Does anybody have any recomendations as to the suspension for a supercharged Mk1.
The car is only used on the track so comfort isn't important. Koni do a non adjustable kit which I'm inclined to use.
I may race the car next year and a lot of regs don't allow adjustable/coilover suspension.
Will be uprating the bushes and possibly doing the ARB,s as well.[/u][/i]

[kaiowas]

KYB is the common option for uprated non-adjustable dampers. They're pretty cheap too.

I'd also highly recommend upgrading the rear ARB at the very least.

[Rogue]

I may race the car next year and a lot of regs don't allow adjustable/coilover suspension.

Actually, you'll find with a supercharged MR2 the series that you're eligible for will allow adjustable suspension. The MR2 Championship (and mk1 Racing Series) require fixed dampers but will only allow normally aspirated cars, so you wouldn't be eligible.

The MR2 Super GT series allows you to use any Toyota engine, modified any way you see fit, subject to not exceeding power-to-weight limits that are policed using a datalogger. Suspension is a controlled item, and the series uses BC Racing RM type MH kits. These are inverted monotubes with pillowball top mounts that offer independant ride height, spring preload, damping / rebound, and camber adjustment. They're available for all three versions of the MR2 which levels the playing field with regards to suspension.

As a controlled item they must be purchased from Rogue Motorsport Ltd, but they are available to registered competitors at a significant discount.

http://www.bc-racing.co.uk/search/?pfin ... rch=search

If you want any more information about racing in the MR2 Super GT series then please feel free to contact me or visit our website:

http://www.mr2supergt.com/

It would be fantastic to have a mk1 join the grid - we currently have mk2 turbos, mk3 turbos and mk3 V6's, so a mk1 supercharger would fit in very nicely!

Best regards,

Patrick Mortell
Rogue Motorsport Ltd
01676 530222

[Mavros]

Super GT looks like the direction to go in, quite like the idea of really modding the car. It's currently running about 200bhp but we also have a mk3 which we were planning on fitting a supercharger.
Patrick can you give me a price for these coilovers?

[Rogue]

Replied by PM.

[Mavros]

Cheers Patrick,

Will give you a call next week.

[pbmr2]

just out of curiosity, what is the power to weight ratio limit?

say for a mk2 mr2..

[Rogue]

just out of curiosity, what is the power to weight ratio limit?

say for a mk2 mr2..

Power to weight limit is the same for all cars and there are limits at ~200bhp/ton and ~250bhp/ton. Aerodynamic efficiency plays a part as well.

[Shmed]

Am I missing something with power to weight? Surely 250bhp per ton is just a lightweight, but otherwise standard rev3?

Not that Super??

[jasongtr]

a rev3 turbo under 1000kgs? with a cage and fire system, possible im sure but lots of expensive lightweight body panels i would of thought

[Rogue]

Am I missing something with power to weight? Surely 250bhp per ton is just a lightweight, but otherwise standard rev3?

Not that Super??

Yes, that easy and really that Super! Power figures are at the wheels and measured in real time by a datalogger. No bullshoot dyno flywheel figures here.

I know 250bhp/ton doesn't sound like much but it really is plenty to get yourself into trouble with. My v6 mk3 race car has around 260rwhp and I challenge anyone in any specification of road based MR2 to keep up on a circuit.

[Shmed]

Like I say, I'm probably missing something in that I haven't really pushed a higher powered 2 round the track.

The rev 2 weighs about 1200kg standard, is that right? I see what you're saying about the power figure Patrick, so a conservative estimate of 224bhp atw (20% trans loss from 280bhp standard) on a rev 3 that's about 187bhp/ton with no lightening? Shed 200kgs to get to 224/ton?

I'm only upset because I hoped I 'might' be able to enter the super GT one day - when I have more time, but I expect to be running around 380bhp/ton. Is the theory that that would be undriveable?

[jasongtr]

i doubt a rev3 turbo is 1200 std, more like 1300

[Rogue]

Standard flywheel horsepower figure for a revision 3 car is 241bhp.

Have a look at the following video - it shows me driving a car roughly equivalent to what you're suggesting. It's a stripped out Championship car with a forged - but otherwise standard - rev 3 turbo engine. ECU is stock, turbo is a stage 1 hybrid and it has an ST205 chargecooler. Look how quickly the two GT250 cars pull away (despite the bizarre start line antics!):

http://www.youtube.com/watch?v=3OIAW-nlUHM

In race two, look how quickly we drop the Championship cars!

The great thing about building a car that is too powerful is that it's very easy then to turn the boost down or add ballast. You can then concentrate on maximising the power across the rev range (the area under the curve on a dyno plot) rather than the peaks.

This video also nicely illustrates the difference between a GT200 and GT250 class car:

http://www.youtube.com/watch?v=iq_eVZvxpJM

[Shmed]

Standard flywheel horsepower figure for a revision 3 car is 241bhp.

of course it is

I see the difference, still looks like fun though. There would be no point in de-tuning from a 3076 though would there? Wouldn't that be too laggy?