IPS/SPS/WTF?

[bobo]

So the Exige V6 Roadster gets SPS. The Evora got IPS (which wasn't too clever a system apparently - well according to the press anyway).

Whats the difference? Why the shift? Does anyone have a view?

Thanks...

[kambites]

I believe IPS is a Toyota torque converter auto, SPS is a clutched auto.

[bobo]

interesting as they have an off the shelf IPS solution already... i guess they think its not aggressive enough?

[Thorburn]

I've written a few bits on the IPS and SPS gearboxes in the Evora and the Elise respectively.

IPS: http://wiki.seloc.org/a/Gear_Ratios_-_Evora
SPS (EC60A): http://www.seloc.org/articles/guides/speculating-o...

The Evora GTE also uses the EA60 box with SMT automation. Both the SPS and IPS systems are controlled by the same Transmission Controller Unit (http://issuu.com/lotuscars/docs/lotus_controllers_r1).

In the Elise SPS the SMT setup appears to adds around 5-10kg. The U660E is quite a bit heavier, is presumably larger as well, and in the Evora IPS needs a separate cooler, so I'd guess the decision is down to size, weight and packaging in the smaller Exige S chassis.

That and they still haven't sold any SPS equipped cars yet. I wouldn't be surprised if that the Evora IPS was effectively a stop gap with a fully developed gearbox so they could get an automatic Evora in to the market a year or two before the SPS package was ready.

[Scuffers]

ones an old-style auto-slush box, the other is an automated manual box

[bobo]

thanks boys ...

[Moospeed]

TMFA - another step closer to Porsche