oh my!

[Zed Five]

Just noticed that Birds do a 400bhp conversion for the 35is, £1090..

... that does not invalidate the bmw warranty.

Would this be drivable without the lsd conversion too?

edit , no they dont. Its £5k

[Jasey]

The last thing the 35iS needs is more power it can't put down

[Maniac]

I think they offer their own warranty as BMW don't support modification against their warranty do they?

[Zed Five]

"All Birds conversions are guaranteed for up to 3 years and do not affect the manufacturers warranty on your car."

Apparently

. Quite interested.

[Garvin]

The last thing the 35iS needs is more power it can't put down

^^^ This. The 35is struggles without a LSD as it is - definitely needs one before any more oomph is applied.

[SO8]

The last thing the 35iS needs is more power it can't put down

^^^ This. The 35is struggles without a LSD as it is - definitely needs one before any more oomph is applied.

I don't find it does ... though too much more would be an issue.

[techathy]

The last thing the 35iS needs is more power it can't put down

^^^ This. The 35is struggles without a LSD as it is - definitely needs one before any more oomph is applied.

OE tyres? Running on the OEs mine had much more power than grip. On Uniroyal Rainsport 3 265/35R18 it feels like it can hand a fair bit more.

[sars]

You really need to know what and where there is an increase in torque, if there is a big increase in low end torque then this will cause you traction problems, however if the increase occurs at higher RPM then traction shouldn't be that different.

Power is a function of torque and RPM, Power enables the car to travel faster, torque is a force at a radial distance resulting in acceleration.

[TitanTim]

One for Maniac

Tim.

[stuartinzg]

Yes mine is getting the LSD before any more power... total beast on full chat already even with super sticky MPSS ...

Wheel spin and almost going sideways at 80+ mph changing from 3rd to 4th in the damp is not a fun experience

[techathy]

Problem is the Z4 has quite a lot of static neg camber at the rear. This reduces pressure on the outside shoulder of the tyre & puts more weight on the inside shoulder when the car is trailing in a straight line. On the MPSS this means when not turning the car is not pressing the sticky rubber into the road. I know on the GT86/BRZ people running high neg camber were finding they could accelerate harder round a gentle corner than dead straight with MPSS tyres.

[Maniac]

One for Maniac

Tim.

To do this I need a working car in the first place. Currently I have a very large paperweight.

[stuartinzg]

Problem is the Z4 has quite a lot of static neg camber at the rear. This reduces pressure on the outside shoulder of the tyre & puts more weight on the inside shoulder when the car is trailing in a straight line. On the MPSS this means when not turning the car is not pressing the sticky rubber into the road. I know on the GT86/BRZ people running high neg camber were finding they could accelerate harder round a gentle corner than dead straight with MPSS tyres.

Very interesting, thanks.

I had planned to reduce the camber, I was looking at some rear camber adjustment arms from germany - looked very high quality. Coupled with the H&R springs and LSD I think it shouldn't compromise then handling?

What are other people's views?

[john-e89]

Problem is the Z4 has quite a lot of static neg camber at the rear. This reduces pressure on the outside shoulder of the tyre & puts more weight on the inside shoulder when the car is trailing in a straight line. On the MPSS this means when not turning the car is not pressing the sticky rubber into the road. I know on the GT86/BRZ people running high neg camber were finding they could accelerate harder round a gentle corner than dead straight with MPSS tyres.

Presumably to aid corner handling if this is correct but if there was a lot of neg camber car would wear the inside shoulder quite quickly and unevenly surely?

Not arguing with you but I'm struggling to think this is right as I've not heard of stories of the E89 wearing the inside shoulder prematurely.

[stuartinzg]

Problem is the Z4 has quite a lot of static neg camber at the rear. This reduces pressure on the outside shoulder of the tyre & puts more weight on the inside shoulder when the car is trailing in a straight line. On the MPSS this means when not turning the car is not pressing the sticky rubber into the road. I know on the GT86/BRZ people running high neg camber were finding they could accelerate harder round a gentle corner than dead straight with MPSS tyres.

Presumably to aid corner handling if this is correct but if there was a lot of neg camber car would wear the inside shoulder quite quickly and unevenly surely?

Not arguing with you but I'm struggling to think this is right as I've not heard of stories of the E89 wearing the inside shoulder prematurely.

Actually lots of discussion online about it... and my run flats had a lot more wear on the inside than outside (at least 2-3 mm difference)

Reducing the rear and front camber so the rear is 1c less can make a huge difference.

What's not really clear is why the BMW spec allows such a huge variation (from -1.9c to -2.8c) and why we can't get it down to -1.0 with OEM adjustments, but the Z4 does have after market camber arms which allow you to get down to -1.0.

There are various threads floating around which state it causes more oversteer, and this is one of the reasons they added neg. camber - it isn't really helping us on the street...

I'm no suspension expert so I'm only going by what people have written and detailed who have first hand experience.

Cheers,