1998 996 C2

[ATM]

identti said:

Nice

Your tyres look quite chunky. What size are they?

[Krikkit]

nebpor said:

Mine goes to 14V when cold, but drops back to just over 13 once warm - I assume that it's the battery being more hungry for charge after it's just taken a whack starting a cold engine?

14+V is typical charge voltage for most alternators, it will drop down a little once the battery is full.

[LordHaveMurci]

[ATM]

LordHaveMurci said:

Strong effort

[ATM]

Edited by ATM on Friday 27th April 10:03

[Dammit]

What was total weight?

[ATM]

Dammit said:

What was total weight?

No scales

[ATM]

Porsche specialist who serviced the car a few weeks ago said they would dial out some camber. Then said they couldn't as car was too low and had no adjustment left.

Then i take it somewhere i take all my cars and they get stuck straight in. Result is car now feels a lot better. Used to dart about on undulations. Now feels well planted.

All before and after numbers were well out.

They took off as much camber as poss on the front. Seems my tricky kw dampers do not have adjustable top mounts.

[Chris Stott]

-.23 toe on left front... must have felt a bit odd!

Looks good now - though still more front camber than stock settings.

[Dammit]

ATM said:

Here's mine:

[CornedBeef]

I think mine needs this, it darts around like you described at speed - and also tramlines a bit. I wasn't sure it it was just the nature of the beast!

[edc]

Dammit said:

Here's mine:

Thats a pretty standard and safe set up. I seem to remember you were going the uprated suspension route. If you're doing this and favour the B road blast rather than daily commute motorway then you might want something a bit more aggressive.

[Dammit]

When I get the car back from paint my intention is to try to do a days session per month with CAT driver training, then as I learn to be a better driver to adjust the geometry as/when. My request of CG was to make a fast, neutral road car when they installed the Ohlins.

[ATM]

CornedBeef said:

I think mine needs this, it darts around like you described at speed - and also tramlines a bit. I wasn't sure it it was just the nature of the beast!

Well i know F all about all this alignment malarky but i know this. Before the car was darting about and i too just thought it was thr nature of the low setup with camber. Now its a lot better. Feels completely different. Any bump before and it felt twitchy. Now not at all.

The word from the alignment guys is they are sensitive to toe these 911.

[ATM]

Chris Stott said:

-.23 toe on left front... must have felt a bit odd!

Looks good now - though still more front camber than stock settings.

Yeah it did feel odd. You felt less relaxed if that makes sense. Now hands off the wheel it just stays straight over bumps, cats eyes and dashed white lines.

I assumed my tricky kw dampers had adjustable top mounts but they dont. So all they could do was loosen the top mount bolts and knock them out as far as poss.

So i guess i either raise it or get some adjustable arms or top mounts if i want less camber. But for now it feels a lot better. I really should of had it done straight away.

[Chris Stott]

ATM said:

The word from the alignment guys is they are sensitive to toe these 911.

Had mine done at Kwikfit a few years back as they were half the price of my Indy. They got it all on spec and it felt fabulous, and only £75.

Left it with the wife for the week while I was on a business trip. Came home on Friday and she says 'the car doesn't feel right'. I take it for a quick spin and it's fking terrifying... every time I turn left it feels like the back is going too come round, and this is at sensible speeds in 30/40 limits, god knows what a lane change must have felt like on the motorway at 80ish

Pulled in to a garage to have a look and I could immediately see the OSR was toeing out - looked like the bottom arm was bent!

Took it back and IIRC, it showed -0.54 on the OSR! Adjuster had come loose.

ATM said:

I assumed my tricky kw dampers had adjustable top mounts but they dont. So all they could do was loosen the top mount bolts and knock them out as far as poss.

So i guess i either raise it or get some adjustable arms or top mounts if i want less camber. But for now it feels a lot better. I really should of had it done straight away.

I think you'll be fine at -1.5 on the front.. that's not excessive.

Edited by Chris Stott on Saturday 24th February 15:13

[ATM]

Edited by ATM on Friday 27th April 10:04

[ATM]

So been out testing the 17 inch wheel tyre combo. Stuck to same pressures as 18 inch setup 29F 36R. I couldn't find anything on Google about recommended pressure specific to 17.

Anyway it feels bouncy now pressing on. Worst in bends when it starts to feel unsettling. Only way i can describe it is like the damper rebound is not working.

Some people warned me on here - can't remember which thread - that a firm damper with a softer tyre can give tyre bounce. So now that's in my head.

I've never twiddled the knobs on the KW dampers so i guess that's next.

If i have only changed wheel tyre combo so far and it now feels bouncy then it could be this tyre bounce. My mates are saying add more rebound [no experts there] but I'm thinking maybe reduce bump setting to give tyre less aggro - does that make sense?

So what's the general advice on damper adjustment when switching to a softer tyre?

[ATM]

Kawasicki said:

ATM said:

Kawasicki said:

Be careful, sometimes uprated suspension doesn't work well with tall sidewalls. The car may start to bounce noticeably on the tyre and work the damper less. This feels sh!t and lessens grip too.

Ok thanks. How would I know if this is happening?

The effect is pretty noticeable, especially in pitching front to back. Vertically stiffer sidewalls will help.

Found it back here. Yes i think i have this going on now.

[RM]

ATM said:

Kawasicki said:

ATM said:

Kawasicki said:

Be careful, sometimes uprated suspension doesn't work well with tall sidewalls. The car may start to bounce noticeably on the tyre and work the damper less. This feels sh!t and lessens grip too.

Ok thanks. How would I know if this is happening?

The effect is pretty noticeable, especially in pitching front to back. Vertically stiffer sidewalls will help.

Found it back here. Yes i think i have this going on now.

poppopbangbang also mentioned stiff sidewalls in his thread, it may be worth asking him too. I'm interested as I have plans for a 996 on 17s!

poppopbangbang said:

I am using Yokohama AD08R, 235 on the front and 295 on the back. They are many times better than a R888 or similar in the wet, being actually usable in standing water but still a cut above a "normal" summer tyre in the dry - they also have a very stiff sidewall, something really needed on a 996 due to the high rear axle loading compared to most saloons and hatches.