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Author Subject: Denis's Rallye
Denis

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Location: Cambridge

Registered: 07 Sep 2004

Posts: 491

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Post #126
The springs are 2.5” and as it is two springs - they come down a long way down the strut. So with 15x7 ET15 wheels – I have to run 15mm spacers to comfortably fit the wheels. (This is also the reason that I had to take off my negative camber hubs – the wheels where much closer the struts).
It is not ideal to run with ET0 as it increases scrub radius and the car is prone to tracking the road.
The right solution would be to run 406 hubs (the dimension of the flange to strut is 15mm larger) and longer wishbones (at the same time could lengthen the balljoint and improve the angle of the whishbones!). But also would need longer driveshafts.

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Cherry Red Rallye Project thread
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Posted 28th Jun 2011 at 03:35
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daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

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Post #127
russian guy wrote:
The springs are 2.5” and as it is two springs - they come down a long way down the strut. So with 15x7 ET15 wheels – I have to run 15mm spacers to comfortably fit the wheels. (This is also the reason that I had to take off my negative camber hubs – the wheels where much closer the struts).
It is not ideal to run with ET0 as it increases scrub radius and the car is prone to tracking the road.

The right solution would be to run 406 hubs (the dimension of the flange to strut is 15mm larger) and longer wishbones (at the same time could lengthen the balljoint and improve the angle of the whishbones!). But also would need longer driveshafts.


Thanks Dennis. Sounds like a lot of extra work and expense though, I think I'll forget about helper springs and just get shorter main springs for now. I've got brand new drive shafts and neg camber hubs so I can't face the prospect of getting rid of them and starting over.

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Posted 28th Jun 2011 at 03:43
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Denis

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Location: Cambridge

Registered: 07 Sep 2004

Posts: 491

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Post #128
adam b wrote:

Will have a chat with you in the near future about the tender progressive springs as that might be the answer to my Volvo ride quality problems. Its having different springs today (longer 400s) so hope that will sort it out. I've been thinking for some time that smaller progressives with a stronger main spring might be the way forward, but bit looked into it.


When you run two springs, one on top of the other, this is the same as having two resistors in parallel. So that overall spring rate is lower than smallest.

So with my 250-550lb tender progressive and 650lb main springs the overall rate starts with 180lb when the front wheels start to touch the ground. Goes to about 270lb with the car on the ground, then it is 300lb when the tender progressive closes and the spring rate goes to 650lb.

What it means in practice is that you get very low spring rate when driving in a straight line. Once you turn in to a corner and weight transfer happens – the outside of the car rides on very stiff spring which resists the roll. As a bonus, as the other side gets unloaded – there spring gets softer and it pushes up less = still less body roll!

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 28th Jun 2011 at 04:23
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adam b

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Post #129
Sounds very interesting indeed. I guess it helps a lot having the 3-ways to control the springs. Would my singles cope or would I end up with too much damping for most bumps and possibly not enough later on in the travel?

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Nothing to see here
Posted 28th Jun 2011 at 14:20
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Denis

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Location: Cambridge

Registered: 07 Sep 2004

Posts: 491

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Post #130
Single adjustable are fine – that is what I had on my car for the past year. I felt that the spring rates were very good and kept the same springs when upgrading to 3-ways.

Have a look at Eibach ERS for more info.

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 28th Jun 2011 at 23:57
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Denis

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Location: Cambridge

Registered: 07 Sep 2004

Posts: 491

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Post #131
From Thursday:





Short clip: video

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 9th Mar 2020 at 20:33
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cosmic spanner

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Location: North London

Registered: 11 Oct 2004

Posts: 10,399

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Post #132
russian guy wrote:

Short clip: video


Superman it must be embarrassing being in something so impractical and uncomfortable as a caterfield.. and being unable to catch an old french hatchback in front, who for all you know is listening to the radio! LOL

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Posted 13th Aug 2011 at 20:01
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jimmy_boy

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Location: Christchurch

Registered: 09 Jun 2003

Posts: 14,751

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Post #133
cosmic spanner wrote:
russian guy wrote:

Short clip: video


Superman it must be embarrassing being in something so impractical and uncomfortable as a caterfield.. and being unable to catch an old french hatchback in front, who for all you know is listening to the radio! LOL


.. and here's you waffling on about P6000's hahaha! (Uploaded by the same caterfield guy)

CLICK

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Posted 14th Aug 2011 at 17:52
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cosmic spanner

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Post #134
jimmy_boy wrote:
cosmic spanner wrote:
russian guy wrote:

Short clip: video


Superman it must be embarrassing being in something so impractical and uncomfortable as a caterfield.. and being unable to catch an old french hatchback in front, who for all you know is listening to the radio! LOL


.. and here's you waffling on about P6000's hahaha! (Uploaded by the same caterfield guy)

CLICK


LOL I should be careful what I say in future! Doh

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..Liberty is a well-armed lamb contesting the vote.

Project é - my 306 project thread.
Posted 14th Aug 2011 at 18:19
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Denis

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Post #135
Details of the plates that I made for Safety Devices 6-point cage. The Idea was to spread the load out as much as possible and try to tie in to the structural part of the car, as the floor under the cage feet is very weak. The welding was done by a company called Fabricage, near Cambridge (they specialise in manufacturing and installing custom roll cages).





The rear plates shaped to the profile of the wings.





Extra mount for the a-pillar



Extra mounts for the b-pillar using the seatbelt fixings



As the sun-visors can�t be used with the cage, made some brackets to keep them

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 9th Mar 2020 at 20:57
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Denis

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Post #136
Made some seat subframes to re-use existing standard fixings and lower the seats as much as possible. Not to mention that the driver�s seat is perfectly in-line with the steering wheel (which most people do not think about when fitting bucket seats).



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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 9th Mar 2020 at 20:58
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Denis

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Location: Cambridge

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Post #137
Home-made induction kit. RS engine seems to respond very well to long inlet, so I�ve moved the filter as far away as possible from the throttle body. Rolling road showed some nice results...



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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 9th Mar 2020 at 20:59
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Denis

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Location: Cambridge

Registered: 07 Sep 2004

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Post #138
Who cares how the inlet manifold looks on the outside? It is the inside that counts. So cut it open, smooth and polish all the runners and trumpets. Seat dyno says that the engine breathes better at the top end.



Polishing the insides



Welded back up

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 9th Mar 2020 at 21:00
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Denis

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Location: Cambridge

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Post #139
Design of some new top mounts for 2 deg of extra castor and adjustable camber 1 to 4 deg.

Wooden prototype



Freshly made



Plate fitted to the car and metal cut away to give clearance for 3deg of camber (no need to cut anything for 1deg, but anything else needs a bit grinding away)



Finished item set to 2deg

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 9th Mar 2020 at 21:02
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Denis

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Post #140
Brake disks cracked from multiple heat-cycles

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Cherry Red Rallye Project thread
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Posted 9th Mar 2020 at 21:03
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jeffers Forum Admin

Location: Leeds

Registered: 14 Dec 2003

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Post #141
Denis, them front topmounts are a work of art! How much did they cost to have made in the end? Unsure

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Posted 11th Mar 2012 at 22:57
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Denis

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Post #142
jeffers wrote:
Denis, them front topmounts are a work of art! How much did they cost to have made in the end? Unsure


They cost quite a bit as 10 sets had to be made to make it economically viable to produce CAD drawings etc. I am just in the process of finalising the list of fittings and getting some prices for a batch of bearings. Once this is all done – will know the final price.

The first set is behaving well on my car. It is surprising how much heavier the steering is with the extra castor!

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 11th Mar 2012 at 23:10
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jeffers Forum Admin

Location: Leeds

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Post #143
I may be interested obviously price depending, you got anything booked for the near future? Oh and have you seen the thread on a forum trackday? Just thought you may be interested! Thumbs up

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Team Running Engine again!
Team Negative Camber!
My Budget track engine build thread!
Now appearing at a Trackday near you!!Hyper Hyper
Posted 11th Mar 2012 at 23:15
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phillipm

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Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,607

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Post #144
russian guy wrote:

The first set is behaving well on my car. It is surprising how much heavier the steering is with the extra castor!


Feckin' loads, I feel like Popeye trying to park mine LOL

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Posted 11th Mar 2012 at 23:31
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adam b

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Post #145
phillipm wrote:
russian guy wrote:

The first set is behaving well on my car. It is surprising how much heavier the steering is with the extra castor!


Feckin' loads, I feel like Popeye trying to park mine LOL


'ello sailor... Wink

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Posted 12th Mar 2012 at 08:41
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cjm_harris

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Location: Parts for Sale section

Registered: 04 Dec 2007

Posts: 7,442

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Post #146
Good effort on putting the pictures of the cage plates up Thumbs up

I have got a SD cage, so good to know the best way to mount it.

Car is looking great as always Smile

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Chris
1999 China Gti6 Supercharged Devil [Fun car] >>Project Thread<<
2000 Bianca 306 Diesel [Work runabout]
Posted 12th Mar 2012 at 10:11
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Denis

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Location: Cambridge

Registered: 07 Sep 2004

Posts: 491

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Post #147
jeffers wrote:
Oh and have you seen the thread on a forum trackday? Just thought you may be interested! Thumbs up


Thanks Lee, have seen the thread and planning to come Cheers

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 22nd Mar 2012 at 22:24
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Denis

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Location: Cambridge

Registered: 07 Sep 2004

Posts: 491

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Post #148
I had chance to run the car at Snetterton yesterday, so put the top mounts through further tests. The conclusion is that the extra camber has improved the grip in low-speed corners. Also they seems to cope without any issues if you take a bit too much curb Superman









Still getting all the bits to assemble the mounts and will have the pricing shortly.

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 9th Mar 2020 at 21:11
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rallye1999

Senior User

Location: redcar

Registered: 05 Jul 2009

Posts: 717

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Post #149
What's that on the roof
Posted 22nd Mar 2012 at 22:34
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Denis

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Location: Cambridge

Registered: 07 Sep 2004

Posts: 491

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Post #150
rallye1999 wrote:
What's that on the roof


LOL Everyone was asking me two questions on the day: what is under the bonnet (the right answer is BAD dampers) and what is this box on the roof (that would be some RF equipment, can’t say more)?!

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Cherry Red Rallye Project thread
WhiteBMW M140i
Posted 22nd Mar 2012 at 22:39
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