Silver C70 T5 - Manual - 400BHP

[Wobbly Dave]

the advantage is that they rev quicker dont they being lighter?

That would matter if I was revving to 9k. I have a turbo that drives my engine so if I
had a highly strung race engine there would be a point to a lighter flywheel. Differences in this case I believe are negliable.

[smithy]

i understand what they are saying because the dmf makes the car smoother due to weight and balance but a good smf would be alot lighter and cheaper for clutch upgrads.my 940 uses a dmf as standard but i stuck a smf due to the dmfs not taking the power ,now i have a ttv racing smf and 850r clutch no probs at all

[Wobbly Dave]

Well I had to go with vendor advice, for better or worse. Perhaps I am older and more doddery than most

[smithy]

Well I had to go with vendor advice, for better or worse.

as long as it works and takes the power that is what counts mate now sort that map out

[jardon]

Well I had to go with vendor advice, for better or worse.

Fair enough Dave, but I wouldn't agree with their advice. All the early T5's had an SMF and sprung clutch disc and I haven't ever heard of cranks snapping. In tuned cars with significant torque increases the DMF springs bottom out and it fails - launching and hard gear changes will shorten the process. This has happened to a few of the cars in our little community and fitting an SMF sorts the problem.

I can't wait to get shot of my DMF as it's just another place for slop in the transmission - I don't like how woolly it makes pulling away feel and it vibrates quite badly under full load if the clutch doesn't slip (springs failing). I have driven Tim Williams car which has an SMF/solid hub paddle clutch and it's a pussycat in car parks/hill starts. I appreciate that clutch feel and idle vibration are quite subjective but getting out of my DMF/stock clutch P2 into his 850 was a really pleasant surprise. Don't forget Tim is running 650nm through that unsprung/no DMF set up on road/track and has been for years with no snapped crank or driveshafts. A lighter flywheel won't make be as noticeable in higher gears but off the line the lower rotational inertia makes a significant difference.

Tim is fitting a sprung hub CG Motorsport 5 puck cerametallic clutch for me together with a TTV SMF and Gripper diff this week. It will make low gears more usable and improve standing start acceleration.

Glad you like the Quaife. A few of the boys have said it takes time to get confidence in LSD's/ATB's and yes it likely would just plough straight on if you overwhelmed traction at both wheels in a corner.

[T5frankie]

Fair enough Dave, but I wouldn't agree with their advice. All the early T5's had an SMF and sprung clutch disc and I haven't ever heard of cranks snapping. In tuned cars with significant torque increases the DMF springs bottom out and it fails - launching and hard gear changes will shorten the process. This has happened to a few of the cars in our little community and fitting an SMF sorts the problem.

I can't wait to get shot of my DMF as it's just another place for slop in the transmission - I don't like how woolly it makes pulling away feel and it vibrates quite badly under full load if the clutch doesn't slip (springs failing). I have driven Tim Williams car which has an SMF/solid hub paddle clutch and it's a pussycat in car parks/hill starts. I appreciate that clutch feel and idle vibration are quite subjective but getting out of my DMF/stock clutch P2 into his 850 was a really pleasant surprise. Don't forget Tim is running 650nm through that unsprung/no DMF set up on road/track and has been for years with no snapped crank or driveshafts. A lighter flywheel won't make be as noticeable in higher gears but off the line the lower rotational inertia makes a significant difference.

Tim is fitting a sprung hub CG Motorsport 5 puck cerametallic clutch for me together with a TTV SMF and Gripper diff this week. It will make low gears more usable and improve standing start acceleration.

Glad you like the Quaife. A few of the boys have said it takes time to get confidence in LSD's/ATB's and yes it likely would just plough straight on if you overwhelmed traction at both wheels in a corner.

i wish i would have known this when my clutch and flywheel went i couldnt find a secondhand dmf anywhere so had to buy a complete engine with one attached could of got a brand new smf for alot less than i paid lol

[jardon]

as long as it works and takes the power that is what counts mate now sort that map out

Having said all that in my last post - I agree with Smithy, enjoy it.

[smithy]

i wish i would have known this when my clutch and flywheel went i couldnt find a secondhand dmf anywhere so had to buy a complete engine with one attached could of got a brand new smf for alot less than i paid lol

if you would of asked before you looked for a dmf i would of told you to get an 850 smf and 850r clutch mate but aslong as you are sorted that is what counts

[Wobbly Dave]

Fair enough Dave, but I wouldn't agree with their advice. All the early T5's had an SMF and sprung clutch disc and I haven't ever heard of cranks snapping. In tuned cars with significant torque increases the DMF springs bottom out and it fails - launching and hard gear changes will shorten the process. This has happened to a few of the cars in our little community and fitting an SMF sorts the problem.

I can't wait to get shot of my DMF as it's just another place for slop in the transmission - I don't like how woolly it makes pulling away feel and it vibrates quite badly under full load if the clutch doesn't slip (springs failing). I have driven Tim Williams car which has an SMF/solid hub paddle clutch and it's a pussycat in car parks/hill starts. I appreciate that clutch feel and idle vibration are quite subjective but getting out of my DMF/stock clutch P2 into his 850 was a really pleasant surprise. Don't forget Tim is running 650nm through that unsprung/no DMF set up on road/track and has been for years with no snapped crank or driveshafts. A lighter flywheel won't make be as noticeable in higher gears but off the line the lower rotational inertia makes a significant difference.

Tim is fitting a sprung hub CG Motorsport 5 puck cerametallic clutch for me together with a TTV SMF and Gripper diff this week. It will make low gears more usable and improve standing start acceleration.

Glad you like the Quaife. A few of the boys have said it takes time to get confidence in LSD's/ATB's and yes it likely would just plough straight on if you overwhelmed traction at both wheels in a corner.

I appreciate your input.

I am quite literally still getting to grips with the ATB. I will say that the assistance it provides is very smooth, maybe not as hardcore as some may wish. I certainly wouldn't want a paddle clutch within the realms of my plans - far too harsh.

I realise the DMF is a road based compromise but it was one I was prepared to make for sake of smoothness. It is at the end of the day stil the daily drive - with occasional track use.

[Engineer]

That would matter if I was revving to 9k. I have a turbo that drives my engine so if I
had a highly strung race engine there would be a point to a lighter flywheel. Differences in this case I believe are negliable.

Not so Dave check out MOI ...............

[Wobbly Dave]

Moi as in the french me? Engineer have you gone all pretentious on me? LOL.

Details, details...

[Wobbly Dave]

Just thought I would post this as I am missing the C70 which is still sans gearbox.

[ame]http://www.youtube.com/watch?v=8A5TKrs7e8w[/ame]

Think she suprised as few people that day.

[p fandango]

Just thought I would post this as I am missing the C70 which is still sans gearbox.

http://www.youtube.com/watch?v=8A5TKrs7e8w

Think she suprised as few people that day.

i thought they were powering up the fan, didn't realise your car was running its too quiet lol

[Wobbly Dave]

This was Claymore's specialist place over near Shrewbury.

Granted standing still at tick over she is quieter than a D5 (58dB).

[p fandango]

Granted standing still at tick over she is quieter than a D5 (58dB).

i meant on the power-run, as i said i thought it was the fan until your car moved after they backed off lol

[Wobbly Dave]

If it was that quiet why was the mike on my phone clipping out!!

[p fandango]

If it was that quiet why was the mike on my phone clipping out!!

just listened to it again, sorry it does just sound like the fan's on overdrive

[Wobbly Dave]

That's what she sounds like but you cannot tell that well with the poor sound quality.

[Happygilmore78]

Ahhh, the silver bullet - love that car!

[Wobbly Dave]

Gearbox/ATB project progress is slow but steady. I haven't said a great deal as things were still a bit up in the air, but this is getting somewhere now.

As I may have hinted before there is a problem with the refurbished box. HLM have dropped & returned both original & refurbished M56 boxes to Hertfordshire. As the firm in question did not fit the gearbox the extent of their warranty was only within the box itself. I can understand it but it does mean paying for the 2nd drop.
I must say a big thanks to StormTroll for picking them up.
I appreciate that the silver bullet will be getting a bit under foot in Bromsgrove - Hamish has been very patient & understanding (rare I know ).

I have finally spoken to the gearbox specialist, who thinks he knows what the issue is. There is some "float" on the selector for 2nd. To me that sounds like there is some play in the selector fork that could be rattling around & knocking it out of gear. I am no specialist but I heard a similar story on certain Ford gearboxes.

He will inspect my original box with a view to either repairing the selector in the newly refurbished box - swapping the ATB quaiffe diff into my original or making a good box out of both.

In hindsight - something at least I can pass on - M56 parts are not available anymore. Volvo don't sell 'em - so what ever box you choose for such an upgrade/mod will always bear some risk. I think the fact that the new gearbox was running the wrong oil in it goes some way to explaining the wear. So if you do buy a 2nd hand box ensure it has the genuine oil specified for the box. Without the precise history of the donor box - I guess it is difficult to say.

Just thinking out loud - My original gearbox has been well used, so ending up with it would be a known quantity but in the end with 150K of driving, there is an element of compromise. How much long will it last? There again the new box could last longer be less worn in other areas. I just hope something good will come out of this.

The perfect fix would be a brand new gearbox - but I cannot justify this on 11 year old C70, plus I would like to remain married.

Just be aware when you buy a 2nd hand box - even if you are getting it rebuilt - there are no new internals available to buy. So perhaps buying 2 cheap ones is the way to go?

I will find out later in the week what the prognosis is. Safe enough to say no draggy for me this weekend.