front alignment specs
03-02-2009, 05:04 PM
#1
Racer
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front alignment specs
After putting on the new caster blocks and M030 struts/springs and 17" wheels I'm going to need a front end alignment. The local Porsche dealership is running a March special, so anyone have the specs for the above set-up? Street car with a few DE events mostly stock 88 951. Thanks. Dan
03-02-2009, 05:30 PM
#2
Rennlist Member
Stock setup, which the dealer will have.
If you'd like, you could add an extra 1/2 degree of negative camber to both sides. I wouldn't go farther than that... If the DE events are really "few and far between", I'd stick with stock.
If you'd like, you could add an extra 1/2 degree of negative camber to both sides. I wouldn't go farther than that... If the DE events are really "few and far between", I'd stick with stock.
03-02-2009, 06:39 PM
#4
Drifting
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yup - for street car definitely street align it (factory spec or very close)
the advantages on the track of a track alignment frankly you will not even notice on a stock setup with street tires for a few DE sessions a year. However you will pay dearly for it on the street in the form of; tire wear, poor street manners, tracking high spots in the road, darty steering on odd/poor surfaced streets etc.
the advantages on the track of a track alignment frankly you will not even notice on a stock setup with street tires for a few DE sessions a year. However you will pay dearly for it on the street in the form of; tire wear, poor street manners, tracking high spots in the road, darty steering on odd/poor surfaced streets etc.
03-02-2009, 08:43 PM
#5
Racer
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My daughter uses one of my 944's for AX, DE, and it's also street driven. I set it up with a "compromise" alignment consisting of 2-1/2 degrees front, 2 degrees rear, front toe half of stock value, and same for the rear toe.
Honestly you can't tell on the street (no bad manners) but it works much better on the track.
This is a normally aspirated car with LSD, M030 (adjusted fairly low) and HD Bilstiens running 225/40/15 Hankook Z212's on 7 and 8 inch fuchs.
You'd think the car would ride terrible and be darty, but you'd be wrong, it's entirely civilized.
Honestly you can't tell on the street (no bad manners) but it works much better on the track.
This is a normally aspirated car with LSD, M030 (adjusted fairly low) and HD Bilstiens running 225/40/15 Hankook Z212's on 7 and 8 inch fuchs.
You'd think the car would ride terrible and be darty, but you'd be wrong, it's entirely civilized.
03-02-2009, 10:55 PM
#7
Burning Brakes
i'm curious about caster: do you use a different setting for track cars or is stock the best? also, how does different caster affect steering feel and weight? (i've got manual steering so it matters more on my car than PS.)
just curious about all this as i don't really know the what caster does other than stability.
caster; the most ignored and mysterious of all the alignment settings!
just curious about all this as i don't really know the what caster does other than stability.
caster; the most ignored and mysterious of all the alignment settings!
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03-02-2009, 11:53 PM
#8
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It also depends on what size, type, and aspect ratio your tyres are. The larger size with lower a/r and R spec will dart a lot more than normal size road tyres.
03-03-2009, 12:20 AM
#9
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Caster has the same effect (is the same thing) as rake on a bike. The more rake, the slower the steering, trail being equal. However, trail isn't equal, it increases with more caster, which makes the steering heavier feeling (more resistant to being deflected from a straight line, a stronger self centering force).
edit: I wasn't clear, more caster should make the steering slower but lighter feeling. But it comes along with more trail which does the opposite to steering feel. You really have to experiment with an individual car to find out what it's going to do.
03-03-2009, 07:57 AM
#11
Drifting
When I had a compromise alignment, I added an extra 1/2 degree of camber up front and it dialed out the understeer on the track with no difference in street drivability. Tires also wore a little more evenly at the track.
The alignment tech's name at HBL is Bobby. He's good and I'd recommend tipping him beforehand.
The alignment tech's name at HBL is Bobby. He's good and I'd recommend tipping him beforehand.
03-03-2009, 08:39 AM
#12
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Probably worth investing in some adj camber plates too. You really want more than 1-2 degrees neg on the track depending on tyres.
03-03-2009, 11:40 AM
#13
Drifting
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So eyeball is this your daily driver?
Dave you should disclose how many street miles you get out of the tires before the inside camber wear shows (2500-3000 maybe)? Also how much rain and bad weather driving does this car see. How many miles you have run this setup? Perhaps the fact that this is a lightly sprung with 15" tall sidewall tire that makes it road compliant.
Respectfully - I have a very similar camber setup with different toe settings....... my tire camber wear is very significant if you are not tracking (getting the car to "roll over").
From my experience this is bad advice for a daily driver that will maybe see a DE session or two a year.
UP to you eyeball, but you will definitely have tire wear, and perhaps (as many others experience) tracking high spots and darty behavior over rough and uneven roads.
I am fine with my setup, and it sees tons of street driving, and I even rather enjoy the mannerisms...... however I would not want to drive it daily and certainly not in inclimate weather (heavy rain or snow).
Dave you should disclose how many street miles you get out of the tires before the inside camber wear shows (2500-3000 maybe)? Also how much rain and bad weather driving does this car see. How many miles you have run this setup? Perhaps the fact that this is a lightly sprung with 15" tall sidewall tire that makes it road compliant.
Respectfully - I have a very similar camber setup with different toe settings....... my tire camber wear is very significant if you are not tracking (getting the car to "roll over").
From my experience this is bad advice for a daily driver that will maybe see a DE session or two a year.
UP to you eyeball, but you will definitely have tire wear, and perhaps (as many others experience) tracking high spots and darty behavior over rough and uneven roads.
I am fine with my setup, and it sees tons of street driving, and I even rather enjoy the mannerisms...... however I would not want to drive it daily and certainly not in inclimate weather (heavy rain or snow).
03-03-2009, 01:49 PM
#15
Drifting