Motorsport 635csi

Andy Boy wrote: ...1983 635CSi Auto       0-100 20.5 secs, 15.7 1/4 mile.

Interesting. The best I could get for mine was 17.01 for the 1/4mile...

1978 635CSi manual 0-100 23.4 secs, 16.2 1/4 mile
1983 635CSi manual 0-100 19.9 secs, 15.4 1/4 mile
1983 635CSi Auto       0-100 20.5 secs, 15.7 1/4 mile
1989 635CSi Auto       0-100 21.5 secs, 16.7 1/4 mile

Fastest non M Power 1/4 mile was posted
by.....original 1976 4 speed 633CSi, 14.9 secs. It's all
about gearing as well as weight.

AndyS wrote: I see the latest diesels have an alloy block. The 535d twin turbo has 272bhp & 413lb/ft torque. Now that would overcome any excess Highline weight.

Diesel 635?? Lovely.....

Seriously though, I am quite interested in the whole carbon fibre bodywork idea. From what I can tell there's outer wings, bonnet and front airdam available in carbon fibre - that's got to add up to quite a weight saving. I don't know what the weight distribution is on a standard 6 but that should balance it up nicely. Shame about the price though....

think the point's been missed

as stated the extra weight will make a difference

if you don't notice it will probably be because you're not tuned in to these things

not saying there's anything wrong with that but if that's the way you are don't make out that just because you can't notice it must be because there's no difference

as i said it's not just the power to weight thing it's the handling, stress on tyres and brakes etc

as for hairdressers, hope you're not going to tell me you don't know what i mean..

I like many others have no problem running 95 RON unleaded in the earlier 10:1 cr engine, even though you can't readily adjust the ignition timing, it seems fine without any tweaking.

 Oh, and I weighed my aluminium bumper parts;

The front bumper (Al part only + number plate mounting only) weighs in at 14kgs. This isn't disasterous- I think there is quite a lot of metal in the chrome version.

However, the rear bumper (with underside valance and brackets fitted, but otherwise incomplete) weighs over 30kgs (over 66lbs in real money...). I was definitely in the mood for a little sit down and a nice cup of tea after I'd weighed this....

The chrome rear bumper is postively gossamer-like by comparison. Maybe they were trying to even out the slightly front-heavy weight distribution... who knows...

Here's a thought; although the M30 engine is great, and it is lighter than the M-car engine it is still a very heavy engine. So how about fitting the new lightweight 6-pot engine/gearbox in an E24 (E28 base) chassis? You'd be looking at very good torque, 250bhp, a very slick gearbox and about 1350kgs (or a bit less) with improved weight distribution in standard trim. This should match or better M-car performance up to about 130mph, and would be better round corners and on the brakes. With no need for a catalyst and less demanding emissions tests I'd imagine there would be more power to come without too much difficulty also. With a range of E24 Carbon bodywork parts now available (front bumper/spoiler, wings, bonnet etc), a sub 1300kg kerbside weight with a fairly standard appearance is on the cards, potentially making it a real 'Q' car.

...hmmmm, interesting....

Who wants to go first?

cheers

 

 

Jonners wrote: That extra weight will make a difference on the road - the question is whether you will notice

Well if you don't notice it then it isn't making a difference!

When the E30 Zoners took their cars to a rolling road session they were expecting big things - chipped, cone filters, big exhausts, modded afm's you name it. There was only a couple that put out more power than standard. But they all thought their cars were faster.

Fact is an '85 "basic" has a power/weight ratio of 149bhp/tonne whilst a Highline has 139bhp/tonne. Like you'll notice that on the A635. Autocar bangs on about tenths of a second here & there. You just don't notice unless you're using a stopwatch.

What have you got against hairdressers? Did one pass you in his Highline?

Brucey wrote: I have a chrome bumper 635 and I got tired of the chrome bits rusting.

You and everyone else, Brucey......

Brucey wrote: So I went out and bought some second-hand aluminium 'highline' bumpers, intending to modify them with wrap-round bits so they resemble the style of the chrome bumpers a bit better.

Oh dear.....!

Brucey wrote: Aluminium will be very light and corrosion resistant, I thought to myself. Well, this turned out to be a stupid idea. Although they could have been very lightweight, they are nothing of the sort. The aluminium bumpers are HEAVY, really really really HEAVY because they are made of very thick material and are designed to meet US spec parking lot collisions.

The Yanks don't call them "Park Benches" for nothing.

You've learnt your lesson now, I take it

Brucey wrote: ...Despite the drawbacks of the chrome bumpers, I'd not trade mine for a highline spec; but hey, each to his own, eh....

The only drawback is fragility. And besides, I like chrome.....

I have a chrome bumper 635 and I got tired of the chrome bits rusting. So I went out and bought some second-hand aluminium 'highline' bumpers, intending to modify them with wrap-round bits so they resemble the style of the chrome bumpers a bit better.

Aluminium will be very light and corrosion resistant, I thought to myself.

Well, this turned out to be a stupid idea. Although they could have been very lightweight, they are nothing of the sort. The aluminium bumpers are HEAVY, really really really HEAVY because they are made of very thick material and are designed to meet US spec parking lot collisions.

I think most of the weight gain in the highlines comes from these fat so-and-sos, and the rest comes from the electric seats, the self-levelling suspension, rear air-con and the leather dashboard etc etc. All of which I can live without quite happily thank you, especially if it tots up to 120kg+.

To put this into perspective this is about the same as the weight of the 6 cylinder engine in the new 6-series. Around a race track, this much extra weight would be like be like losing 20bhp or more. 

All 12V highlines have a lower compression engine and a slightly hotter cam than the earlier cars. Although peak power and torque are comparable with earlier engines there is going to be a smaller area beneath the torque curve. This plus the extra weight means they are mostly fitted with a shorter diff ratio to keep the acceleration reasonable, but this probably has a negative impact on the fuel consumption.

  Despite the drawbacks of the chrome bumpers, I'd not trade mine for a highline spec; but hey, each to his own, eh....

cheers

 

Great info AndyBoy - so the highline m635 is 63 kilos more than a non highline - about 140lbs in old money - that's a significant difference

might not be that noticeable if you're not hugely performance orientated but it's not just the acceleration - the handling will suffer too

added to which if i understand things properly the ecu on highlines had the US setting which produced less power...

633CSi = 1460kg
635CSi = 1480kg (E12 based 78-82)
635CSi = 1453kg (E28 based 82-88)
M635CSi = 1507kg
628CSi = 1438kg
635CSi Auto Highline = 1576kg
M635CSi Highline =1570kg

Jaguar XJS V12 Auto 1693kg :-)

Autos weigh about 20 kilos more due to the weight of
the autobox/torque converter.