Parts Catalog Accessories Catalog Tech Info Tech Forums
 
  Search our site:    
 Cart  | Project List | Order Status | Help    
  Join us November 1st for Casino Night at the Pelican Parts Open House!
Benefiting LuMind - Research and Treatment for individuals with Down Syndrome
Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 911 Technical Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
pete917's Avatar
 
Join Date: May 2006
Location: United Kingdom
Posts: 452
Ride Height

Im trying to collect some data on various ride hieght setups on our (1974-89) 911's.

I know this is not the best way to measure ride height, but if you have the info could you share your ride height as measure from the ground through the centre of the wheel to the wheel arch lip. Both front and back.

Here's mine:

Front Right: 25" (63.5cm)
Front Left: 25 1/4" (64.12cm)
Right Rear: 24 3/8" (61.9cm)
Right left: 24 3/8" (61.9cm)

There are measurements without m in the car. (some balancing to be done on the front )

Cheers guys.
__________________
Pete
Porsche, there is no substitute!
911 Coupe 1974 plus bits | Stuttgart eXchange | Channel P101tv
Old 04-19-2010, 10:25 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #1 (permalink)
coolcavaracing.com
 
Kroggers's Avatar
 
Join Date: Mar 2005
Location: Helsinki, Finland
Posts: 3,510
Garage
Send a message via Skype™ to Kroggers
Hi Pete,

I have been following your other discussion as well, and very interested in the end result. I have my car booked in for a full alignment and corner balance in two weeks time.

The current ride height on my 1978 911SC, measured to the arch lip is:
Front: 62.5cm
Rear 63cm

I am not sure how much this will change when the alignment is done though...

This is my current suspension configuration to help with your analyses:
.- Glen Sanders 23mm hollow front torsion bars.
.- Glen Sanders 33mm hollow rear torsion bars.
.- Koni Yellow adjustable front and rear shocks.
.- Elephant Racing PolyBronze front and rear bushings.
.- Elephant Racing Low-Friction Control Arm Mounts.
.- Elephant Racing Weather-Sealed Trailing Arm Monoball.
.- Elephant Racing Weather-Sealed Front Monoball Cartridge.
.- Elephant Racing ASP - Adjustable Spring Plate with ER QuickChange Splined Hub kit .
.- Tarett Adjustable Hollow Front Sway Bar
.- Tarett Adjustable Hollow Rear Sway Bar
.- Wevo Rear Sway Bar mounts
.- Turbo Tie Rods
__________________
Pål (Paul) - The Norwegian lost in Finland...
1978 911SC 3.6 | 2001 Boxster S Racing Car | 1966 912 based 911 RSR replica racing car (for sale!)
come and follow the Porsche Sports Cup racing fun and me at www.facebook.com/coolcavaracing
Old 04-20-2010, 05:14 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #2 (permalink)
Registered User
 
Talewinds's Avatar
 
Join Date: Jan 2009
Posts: 966
Garage
Add photos...

Mine: 25-1/2" at all four corners.

__________________
88' Carrera, Black/Black/Black, "Murdered Out" OEM.
06' BMW 'M' Roadster (Wife's car and WAY faster than mine)
Old 04-20-2010, 07:26 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #3 (permalink)
Wash. State
 
nesslar's Avatar
 
Join Date: Jun 2006
Posts: 3,566
Just had an alignment done and had the ride height adjusted a bit (mainly left rear, which has always been just a touch too low.
Now I'm at about 25" rear, about 25.75" front; rocker panel "rake" is 3/4" higher at the rear, measured at tip of rocker to ground. I like it.
Side-to-side measurements at like points ground to chassis are identical front, identical rear.
Lotsa guys like 'em lower, but I like to see some "air" over the tires (about 1" or so rear, 1.5"+ front....approx. ...I'll edit for photo later...
Seems identical measurements to fender lips can be hard to obtain; years of body twisting, settling, suspension wear, whatever....one of many interesting little idiosynchrasies with these cars...including the owners, lol.
Old 04-20-2010, 07:31 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #4 (permalink)
I'm here to cause trouble
 
jimbauman's Avatar
 
Join Date: Mar 2005
Location: CA
Posts: 853
@Pete... my ride height measurements are just about identical to yours with 16" wheels ... 23/30 TB's, Koni adjustables, ERB bushings, turbo tie rods and bump spacers on the front, Bilstein Sports and SAW adjustable spring plates and bushings on the back...

JB
__________________
'86 Carrera Cabriolet '73 911T Sporto (RIP)
'90 Miata LeMons Contender! '71 Datsun 510 (RIP)
'67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP)
'62 Plymouth Valiant '60 Ford Galaxy 500 (RIP)
Old 04-20-2010, 07:32 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #5 (permalink)
Registered User
 
Join Date: Oct 2005
Location: Idaho
Posts: 1,724
(sorry for bringing this up) I know this has been said ad-nauseum in other posts . . . but measuring from the fenders is not a great way to be accurate when measuring ride height. My car has welded on rear flares and they are off by almost 1/2" side-to-side (crappy PO welding job too). The front fenders are stock, but are off 1/4". The best way (from the factory manual even) is to measure from the centerline of the torsion bars. You can use the spring plate covers in the rear and the rear end caps in the front. This will be much more accurate (again sorry).

Tom
__________________
'74 911 Red Sunroof Coupe (not stock)
Old 04-20-2010, 07:56 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #6 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Somatic Negative Optimist
 
Gunter's Avatar
 
Join Date: Mar 2002
Location: Winlaw, BC, Canada
Posts: 7,081
Garage
Cool

Being that low, you have issues with bump-steer.
Did you install the spacers under the rack to lessen this problem?
If not, I suggest you do it. :

Decide what height and alignment you want before you have it done.
Some popular settings:
Fender height front 25" and rear 24.5" which gives the desired 1 deg nose-down attitude.
Castor: 6 to 6.2 degree,
Camber: front 1/2 to 3/4 degree, rear 1 to 1.5 degree,
Toe: front slight Toe-in like 1/8", rear 0 (Neutral)

The Tech doing the work will love you if you open each bolt, apply Antiseize lube and re-tighten.
If you do that beforehand, it'll save time and make things easier.

Expect things to settle, i.e., after about 1-2 weeks after adjustments, the height may settle 1/2" to 3/4" down.



Quote:
Originally Posted by Kroggers View Post
Hi Pete,

I have been following your other discussion as well, and very interested in the end result. I have my car booked in for a full alignment and corner balance in two weeks time.

The current ride height on my 1978 911SC, measured to the arch lip is:
Front: 62.5cm
Rear 63cm

I am not sure how much this will change when the alignment is done though...

This is my current suspension configuration to help with your analyses:
.- Glen Sanders 23mm hollow front torsion bars.
.- Glen Sanders 33mm hollow rear torsion bars.
.- Koni Yellow adjustable front and rear shocks.
.- Elephant Racing PolyBronze front and rear bushings.
.- Elephant Racing Low-Friction Control Arm Mounts.
.- Elephant Racing Weather-Sealed Trailing Arm Monoball.
.- Elephant Racing Weather-Sealed Front Monoball Cartridge.
.- Elephant Racing ASP - Adjustable Spring Plate with ER QuickChange Splined Hub kit .
.- Tarett Adjustable Hollow Front Sway Bar
.- Tarett Adjustable Hollow Rear Sway Bar
.- Wevo Rear Sway Bar mounts
.- Turbo Tie Rods
__________________
1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats.
Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
Old 04-20-2010, 07:59 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #7 (permalink)
Taking it apart is easy
 
Jerome74911S's Avatar
 
Join Date: Nov 2009
Location: rural Quebec, Canada
Posts: 1,429
Garage
Quote:
Originally Posted by Tom '74 911 View Post
(sorry for bringing this up) I know this has been said ad-nauseum in other posts . . . but measuring from the fenders is not a great way to be accurate when measuring ride height. My car has welded on rear flares and they are off by almost 1/2" side-to-side (crappy PO welding job too). The front fenders are stock, but are off 1/4". The best way (from the factory manual even) is to measure from the centerline of the torsion bars. You can use the spring plate covers in the rear and the rear end caps in the front. This will be much more accurate (again sorry).

Tom
Tom's is a really good point. I never thought about the fenders being off. But, there is another point that confuses me. When I am sitting in the car, then the heights are equal right to left side within 3mm (assuming the fenders are okay). Is this the right way to measure, or should there be no weight in the car?

Jerome
Old 04-20-2010, 08:02 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #8 (permalink)
Registered User
 
Join Date: Oct 2005
Location: Idaho
Posts: 1,724
Quote:
Originally Posted by Jerome74911S View Post
Tom's is a really good point. I never thought about the fenders being off. But, there is another point that confuses me. When I am sitting in the car, then the heights are equal right to left side within 3mm (assuming the fenders are okay). Is this the right way to measure, or should there be no weight in the car?

Jerome
When you drive your car, and you're cornering and braking and testing the car's balance are you in it? : ) : ) YES!!!! The best way to take all these measurements is with you or your equivalent weight in the driver's seat. Great point.

Tom
__________________
'74 911 Red Sunroof Coupe (not stock)
Old 04-20-2010, 08:07 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #9 (permalink)
Registered User
 
Join Date: Oct 2003
Location: UK, Cheltenham
Posts: 318
Final settings following a full ride height/corner weight/alignment session are (roughly):
Rear camber -1 deg 32'/-1 deg 38'
Toe +1.5/+1.8 mm


Front camber -0 deg 56'/-0 deg 58'
Toe +0.7/+0.7 mm
Castor: +5 deg 30'/+5 deg 38'

Ride heights (left/right) - measured torsion bar centre to wheel centre:
Front (before) 127/122mm Front (after) 133/132mm
Rear (before) 239/254mm Rear (after) 254/257mm


__________________
"Racing is Life. Anything that happens before, or after, is just waiting"

1988 Carrera 3.2 Sport Coupe - my mistress
2009 BMW E60 saloon - the work horse
2012 BMW F11 touring - the dog bus!

Last edited by UK Carrera; 04-20-2010 at 11:21 AM..
Old 04-20-2010, 11:19 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #10 (permalink)
Registered User
 
Talewinds's Avatar
 
Join Date: Jan 2009
Posts: 966
Garage
Wow, that looks perfect to me! Nice. Got any more photos from the side?
__________________
88' Carrera, Black/Black/Black, "Murdered Out" OEM.
06' BMW 'M' Roadster (Wife's car and WAY faster than mine)
Old 04-20-2010, 11:32 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #11 (permalink)
Registered User
 
Join Date: Oct 2003
Location: UK, Cheltenham
Posts: 318
Here you go - just about to undergo corner weighting:

__________________
"Racing is Life. Anything that happens before, or after, is just waiting"

1988 Carrera 3.2 Sport Coupe - my mistress
2009 BMW E60 saloon - the work horse
2012 BMW F11 touring - the dog bus!
Old 04-20-2010, 11:51 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #12 (permalink)
 
Now available:  101 Projects for Your Porsche Boxster!
Registered User
 
Talewinds's Avatar
 
Join Date: Jan 2009
Posts: 966
Garage
Ya. Really really nice. Thanks!
__________________
88' Carrera, Black/Black/Black, "Murdered Out" OEM.
06' BMW 'M' Roadster (Wife's car and WAY faster than mine)
Old 04-20-2010, 01:22 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #13 (permalink)
Registered User
 
Oh Haha's Avatar
 
Join Date: Oct 2003
Location: Michigan
Posts: 10,991
Garage
Holy Schmoly!!!!!

She is awesome!!!



Now I know what mine would look like with silver petals.


Hmmmm---it IS supposed to rain this weekend.
__________________
1981 911SC ROW
Pacific Blue

Wayne
Old 04-20-2010, 01:53 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #14 (permalink)
UFLYICU
 
ZOA NOM's Avatar
 
Join Date: Feb 2003
Location: Livermore, CA
Posts: 5,418
Garage
Send a message via Yahoo to ZOA NOM
Quote:
Originally Posted by UK Carrera View Post
Here you go - just about to undergo corner weighting:

Oh my, what a beautiful car...

I'll never let either of mine go...

__________________
Racer Rix Spec911.com #5 PRC Website
2005 Seal Grey 997 Carrera Coupe (Daily Driver)
1988 Venetian Blue Carrera (former Daily Driver)
1987 Venetian Blue Carrera Track Whore "Shellback Racing" (Porsche Racing Club Spec 911)
Old 04-20-2010, 03:36 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #15 (permalink)
Registered User
 
Join Date: Oct 2003
Location: UK, Cheltenham
Posts: 318
Note that the wheels on my car are not painted - the centres are bare aluminium.

I have simply stripped the paint from the centres.
__________________
"Racing is Life. Anything that happens before, or after, is just waiting"

1988 Carrera 3.2 Sport Coupe - my mistress
2009 BMW E60 saloon - the work horse
2012 BMW F11 touring - the dog bus!
Old 04-21-2010, 11:27 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #16 (permalink)
Registered User
 
pete917's Avatar
 
Join Date: May 2006
Location: United Kingdom
Posts: 452
Quote:
Originally Posted by UK Carrera View Post
Here you go - just about to undergo corner weighting:

Great Pic fella. What size tyres are you running?

That side shot tells a great story with regard to ride height. Mine sits the same as yours to the rear but a little higher to the front.

Since my first post, I have managed to get a consistent reading on the inclination of my car.

I placed a block adjacent to the centre of the wheel on both front and back. Both blocks the same thickness;

I then ran a straight edge from one block to the other. The top of the straight edge now represents the angle of the car at the tyre contact points.

Next I zeroed my inclinometer on the straight edge

Then I transfered the inclinometer to to the centre point of the door sill.

I measure an inclination of 0.4 degrees (down at the front)

So, the distance between weel centres on my car is approx 231.5cm. Over that distance at 0.4 degrees there should be a difference of 1.61cm. Looking at my original readings of rear 61.9cm and front 63.5cm thats a difference of 1.6cm.

So, Porsche recommend a 1 degree gradient. This means I need a further 0.6 degrees or 2.42cm less onfront. This would make my ride heights as follows:

Rear 61.9cm
front 61.08cm.

So I have some adjusting to do

Just for reference. A 1 degree slope over 231.5cm is 4cm. So the front of the car needs to be 4cm lower than the rear. So clearly the height of the arches at the front and rear of the car are not the same....
__________________
Pete
Porsche, there is no substitute!
911 Coupe 1974 plus bits | Stuttgart eXchange | Channel P101tv
Old 04-22-2010, 12:15 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #17 (permalink)
I'm here to cause trouble
 
jimbauman's Avatar
 
Join Date: Mar 2005
Location: CA
Posts: 853
Here's what 24"/23" ride height and 1 degree slope looks like with 15" wheels....





JB
__________________
'86 Carrera Cabriolet '73 911T Sporto (RIP)
'90 Miata LeMons Contender! '71 Datsun 510 (RIP)
'67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP)
'62 Plymouth Valiant '60 Ford Galaxy 500 (RIP)
Old 04-23-2010, 12:13 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #18 (permalink)
Registered User
 
pete917's Avatar
 
Join Date: May 2006
Location: United Kingdom
Posts: 452
She looks nice Jim. You can see te slope of the car from the side skirts.

BTW, what tyres are those?
__________________
Pete
Porsche, there is no substitute!
911 Coupe 1974 plus bits | Stuttgart eXchange | Channel P101tv
Old 04-23-2010, 12:19 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #19 (permalink)
I'm here to cause trouble
 
jimbauman's Avatar
 
Join Date: Mar 2005
Location: CA
Posts: 853
Thx Pete - it was aligned and corner balanced this week...

Those are Nitto NT01 225/45-15's - I got those for the track to replace the Toyo RA1's when they were no longer available.

JB
__________________
'86 Carrera Cabriolet '73 911T Sporto (RIP)
'90 Miata LeMons Contender! '71 Datsun 510 (RIP)
'67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP)
'62 Plymouth Valiant '60 Ford Galaxy 500 (RIP)
Old 04-23-2010, 12:24 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #20 (permalink)
Old 04-23-2010, 12:24 PM
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 



All times are GMT -8. The time now is 08:03 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.