Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > 911 / 930 Turbo & Super Charging Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Doug Siegel
 
Join Date: Oct 2007
Location: Bloomington, IN
Posts: 314
Front-end lowering cont.

On last weeks post about front end lowering, Fredmeister suggested......

"Try to make sure you have a slight 1 degree angle of attack when viewing the car from the side, when you are finished. Meaning the front should sit slightly lower than the rear.This is critical to aero downforce when driving these cars fast."

The guys who lowered my car said that Euro specs set the front a half inch higher than the rear.

Any opinions?

Does a lowered 930 need a bump-steer kit?
Old 03-26-2008, 06:06 AM
  Pelican Parts Technical Article Directory    Reply With Quote #1 (permalink)
Max Sluiter
 
Flieger's Avatar
 
Join Date: Mar 2006
Location: So Cal
Posts: 19,578
Garage
Maybe they are measuring ride height to the fender lip. The front wheel cutout is higher than the rear. It is closer to a circle than the more eliptical rear. Therfore, the front fender lip to ground clearance would be greater than the rear. The important measurement is from "axle" center line to the center of the wheel hub, I think, and this is what effects suspension geometry,handling,downforce,etc. This should show the rake with the front being lower (a larger distance between the front "axle" center and front wheel hub center)
__________________
911S
1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
http://www.flickr.com/photos/max_911_fahrer/
Old 03-26-2008, 10:47 AM
  Pelican Parts Technical Article Directory    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Dec 2005
Location: Atlanta, Georgia
Posts: 459
After lowering inspect your steering arm angle, if they are still horizontal then, I believe, the rack spacers are not needed.
__________________
87 930
96 BMW M3 Coupe
89 951
Peugeot moped
Old 03-26-2008, 04:05 PM
  Pelican Parts Technical Article Directory    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 3,401
The front fender lip should be 1/2" higher than the rear.

The bump-steer kit is not a must; however, you will find out as soon as you drive the car few miles going through pavement joints and bumps mainly while turning = jerks on the steering wheel will be obvious, if so, then you need it.
Old 03-27-2008, 10:49 AM
  Pelican Parts Technical Article Directory    Reply With Quote #4 (permalink)
Smart quod bastardus
 
fredmeister's Avatar
 
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,175
Garage
Yeah the easy way to measure the ride heights is to the fender lips. This is inaccurate and is misleading because of what Flieger said.
A more accurate way is to measure along the body lower rockers with an angle gage. Or actually you will need to get the specs book out for the vehicle and determine through math what the relationships between axle centerline and hub centerline should be for the Euro ride height.
This gets very involved when you start digging into what is "right" and I have been trying to keep it simple.
Ideally the front lower control arm should be parallel with the ground at ride height which gives minimal camber change as the car rolls side to side. This should also align the steering arm links horizontally for least bump steer effect.
__________________
1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 03-27-2008, 12:09 PM
  Pelican Parts Technical Article Directory    Reply With Quote #5 (permalink)
Doug Siegel
 
Join Date: Oct 2007
Location: Bloomington, IN
Posts: 314
Thanks guys. Now I know exactly what to tell the guys who will reset the height, alignment, and corner balance.
Old 03-27-2008, 07:55 PM
  Pelican Parts Technical Article Directory    Reply With Quote #6 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Smart quod bastardus
 
fredmeister's Avatar
 
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,175
Garage
Let us know what they charge for all this work if you don't mind.....I have been trying to get a feel for the price of corner balancing and an aggresive alignment.
Local Porsche dealers will not do alignments here in Detroit area. Most shops are used to muscle cars and just the fact that the engine is in the TRUNK throws them off. I have been doing alignments myself, but without the cash to spend on corner weight scales.....a professional corner balance is on my list of things to do when I win the LOTTO.
__________________
1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 03-28-2008, 09:32 AM
  Pelican Parts Technical Article Directory    Reply With Quote #7 (permalink)
A fellow Pelacanite
 
NathanUK's Avatar
 
Join Date: Nov 2006
Location: UK
Posts: 2,002
Garage
The factory took their ride height measurements from the torsion bars to the ground.
__________________
1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 03-31-2008, 02:12 PM
  Pelican Parts Technical Article Directory    Reply With Quote #8 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 12:40 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2016 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.