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YOUR RESEARCHWheel Spacer Advice for NB 996
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Run gt3 wheels
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I run the GT3 wheels on my 2000 CAB and they are perfect.
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Suggestion
Adjustable dampers (ala Moton, JRZ, etc) have settings to adjust bump and compression so you can the change in direction of the rod inside the damper can be dialed in for a specific direction of travel rather than equal both directions
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I have a set that I ran on my Turbo with narrow body wheels.
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Thant having said I am running the spacers with the BBS REs adn they are fine.
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When I use the H&R wheel spacer measuring technique posted on their website, it says I have no room.
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Suggestion
Adjustable dampers (ala Moton, JRZ, etc) have settings to adjust bump and compression so you can the change in direction of the rod inside the damper can be dialed in for a specific direction of travel rather than equal both directions
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Adjust bump and compression so you can the
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Suggestion
Adjustable dampers (ala Moton, JRZ, etc) have settings to adjust bump and compression so you can the change in direction of the rod inside the damper can be dialed in for a specific direction of travel rather than equal both directions
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Suggestion
If you fail to see how the geometry of a corner changes moving the wheel away from the carrier and how that affects the interaction between the tire and the compression of the corner then there isn't much I can explain any further.
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( I'm still not sure what you meant since you didn't explain how spacers and compression are an issue.)
i would like to push my wheels out a bit purely for aesthetic reasons. I have 18" Sport Classic rims with standard sized tires. The car is a 2000 C2 Cab and has not been lowered. I have seen 7 mm front and 15 mm rear recommended to others.
When I use the H&R wheel spacer measuring technique posted on their website, it says I have no room. The outer edge of the rim and tire are even with the inside of the fender lip on the rear. Will I have to worry about my tires rubbing if I add the spacers?
I'd appreciate your input.
I may not be any help here as I am fooling around with 17" wheels. I am interested in the same issue but with 17 inch wheels & tires. I just switches to the set of aftermarket Turbo Look wheels I had on my 968. They are ET-47 7.5 in the front and ET-62 9's in the back - they look to have moved the wheels out about one inch both front and rear. Odd because the standard offset was ET 55 so the rears are adding 7 mm to the offset - but the front are just compensating for the extra half inch width. I added another 3mm spacer to the rear and that looks good but I would not go wider as my PSS9 suspension is set to GT3 ride height. So my guess is... front plus 5 mm and rear plus 10 mm is about right for me.
This weekend I am installing 18mm spacers on the rear with 295/18s. The inner edges of my fenders were already rolled when I bought the car (they may come that way, I don't know). I plan on putting 15mm spacers on the front (245/18s). My car is on stock suspension.
I'll let you know how that works out...
IMAG0078 Websize C4 rear.jpg
So here is the C4 with the standard 255 on 9x17's in the rear and 225's up front on 7.5x17. The rear has a wheel with ET 62 offset and an additional 3 mm spacer or plus 10 mm net over the stock ET55. Any more that this and I think it would be to much for these tires. The front are ET 47 but with the half inch wider wheel (approx 12 mm) I have a net plus of 2 in the front... assuming my math is correct
Just put the 18mm spacers on. With the 295s in the rear the tires stick out just a bit. If the car was lowered it could be a problem. 15mm spacers would work but 10-12mm would be perfect.
That being said, with a stock width tire the 18's would be fine I'm sure. I can post a pic if you're interested.
Another Note: In Adrian's book 996 Essencial Companion, he states that Porsche approves of a 5 mm spacer front or rear, and a 17mm spacer "for certain rear wheels". Longer Bolts are required for both.
Working with JR at Chris's I am going to play with some 5 and 15 mm spacers ands see what happens. I will take some Pix and post in a few weeks.
Yah, I am thinking on selling them. I got screwed on the deal... I should have asked for less when I bought. I can sell them to you at a good deal
hahahah
Please remember that the examples quoted above for 7 or 15 mm spacers means nothing to you unless your wheels have the same Offset. The width of the Wheel and the Total offset with Spacer is the key to a good fit. Then there is tire size and Suspension height... and - width of the Tread can even be different on the same size tire from different manufactures.
So can you offer me some advice? Fronts are 7.5" 50mm with 18" 235 40's and rears are 10" 65mm with 18" 265 40. Tires are Yokohama Envigors. Car has stock suspension (Canada) and I do not plan to lower it.
The fronts look pretty good and need only a minor offset increase. The rears are recessed far too much. I'm thinking 15 mm spacers on the rear.
pterfloth.....the best example is to use Jake's picture. I'm guessing he is saying for you to add 15mm spacers to get the look he has. Why? The wheels on his car are GT3 wheels which have the following specs (8.5 et40 and 11 et63). I run the GT3 wheels on my 2000 CAB and they are perfect.
Here's how much "theoretical" spacer they have compared to your 7.5et50 and 10et65 wheels.
Front difference 7.5et50 --> 8.5et40 equates to adding a 22.5mm spacer to your 7.5 wheel.
Rear difference 10et65 --> 11et63 equates to adding a 14.5mm spacer to your 7.5 wheel.
Putting on 15mm spacers front and rear would be just fine. I would NOT go more than 15mm in the rear as that is about as maxed out as you can go without putting the tire at risk from compression. The biggest problem you have is the 7.5et50 was the least aggressive of the 18" wheels that were on the 996. FYI....Porsche sells a 17mm spacer that does not require longer bolts. It is a spacer with studs built in. I have a set that I ran on my Turbo with narrow body wheels. Here is what they look like
LINK
That is correct..I should have said with stock wheels you can't go wrong with the 15mm spacers. The GT3 wheel has a little more aggressive offset in the front bu the rears are about the same as stock. Thant having said I am running the spacers with the BBS REs adn they are fine.
I was all set to order a set of 15 mm H&R spacers and bolts when a pair of the 17 mm OEM spacers you referenced came up on EBay, which I bought. Are these going to be too wide for rear with a 265 tire?
Thanks again for your input. Much appreciated. This is such a great forum!
The 265's on the back are too narrow and have no bulge at all on the 10" rim, but they were brand new on the car when I bought it last summer. When they are in need of replacement I will go for a 285 or 295 and review the wheel spacer fitment at that time. I put 12,000 km on them in the last year, weekend pleasure driving only, so that probably will be next summer.
I'd go with the 285 for the 10" and the 295 for the 11".
It's different, but not drastically different with the 265 in the rear, compared with the 285.
I love excuses to dig up old picturs. This is my old C2 with 15mm spacers front and rear on Sport Design wheels.
Couple of notes not that it makes much difference, my fronts were 8" not the standard 7.5", but I think the effective offset was not much different.
Car is pictured on H&R springs with M030 dampers. When it got lower on coilovers the fit was even better.
Picture087.jpg
Sanders......
You are confusing nouns and verbs and the terminology used in the racing/DE engineering world.
Bump steer is the change in geometry (more specifically toe) when the car is under compression
Bump (also called compression) is the when the damper compresses from load
Rebound is when the damper releases back from from said compression.
Adjustable dampers (ala Moton, JRZ, etc) have settings to adjust bump and compression so you can the change in direction of the rod inside the damper can be dialed in for a specific direction of travel rather than equal both directions
Duh. Sorry, there is no tongue-in-cheek smilie.
My point was the comment didn't seem relevant since spacers don't change the suspension geometry, if indeed the reference was to bump steer. In regards to bump (i.e. compression and rebound), although one could argue the increased width would act like a longer lever arm and affect interaction with the spring (rate), I suspect it would be nominal and somewhat independent from the action of the dampers. Still, calculations could be done to verify...
Not trying start anything - I'm just explaining myself since my sense of humor doesn't always come across as I intend it on the forum. ( I'm still not sure what you meant since you didn't explain how spacers and compression are an issue.)
I put the 18mm's on and I think they look fantastic.
If you fail to see how the geometry of a corner changes moving the wheel away from the carrier and how that affects the interaction between the tire and the compression of the corner then there isn't much I can explain any further.
Not sure what is so hard to understand how the tire is at risk from compression when using to large of a spacer. Tire exposed more to the hard edge of the fender, car compresses, tire gets cut, story doesn't end well.
I think the OP has what he needs. Unsubscribing........
I'm sorry. My misunderstanding. I guess I was expecting something more than the obvious. Thanks Captain.
FWIW If that's all you meant then just say so instead of alluding to some technical phenomenon ambiguously labeled "compression" or "bump".
Just say: "Be careful the spacers aren't so thick they push the tires out beyond the fender edge or it may cut the sidewall of your tire when the suspension compresses over a bump."
Clear, concise, helpful - even if it is somewhat obvious.
I have 17s as well. My car is lowered now. Hnr coil overs. What do you think the max is I can use for spacers assuming I fender roll? That�ll be necessary I believe �.
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