Narrow to Wide B front Suspension Chg
04-24-2017, 02:02 PM
#1
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Narrow to Wide B front Suspension Chg
Does changing the front suspension location from narrow body (inboard) to wide body (out board) location change the front suspension dynamics significantly. I know if you change bottom you have to rotate top mounts.
But, are you only moving the suspension out (X) distance top and bottom or is there other significant changes that require other set up changes?? Toe-in changes given.
Bill V are you familiar with the impact of this change??
But, are you only moving the suspension out (X) distance top and bottom or is there other significant changes that require other set up changes?? Toe-in changes given.
Bill V are you familiar with the impact of this change??
04-26-2017, 02:44 AM
#2
Rennlist Member
I'm in the middle of studying this subject myself, and it's getting quite late here so I'm sorry I don't have the exact answer, but here is some good reading on the topic of front suspension geo and different crossmember sizes and settings that I have bookmarked:
https://rennlist.com/forums/964-foru...thread-12.html
http://forums.pelicanparts.com/porsc...uspension.html
http://forums.pelicanparts.com/porsc...pension-3.html
https://rennlist.com/forums/964-foru...thread-12.html
http://forums.pelicanparts.com/porsc...uspension.html
http://forums.pelicanparts.com/porsc...pension-3.html
05-01-2017, 09:17 PM
#4
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Gus, I got back into reading about these. Going to dump some info here. Hopefully it is helpful.
the alternate holes in the chassis are 30mm outboard on each side and given that the difference between 964 and 993 longitudinals is 5mm/side
964 longitudinals in inner holes - 0mm (stock track width)
993 longitudinals in inner holes - +5mm mm (on each side)
964 longitudinals in outer holes - +30mm (on each side)
993 longitudinals in outer holes - +35 mm (on each side)
as I noted earlier in this thread some 993Cups used the 964 long. in the outer mounts on a n/b w/ the same wheels as w/ 993 long. in the inner mounts
the cars that used the outer mounts were the 964 3.8RS, 993RSR and 993GT2 evo
all of these used 9 to 11" front wheels
964 longitudinals in inner holes - 0mm (stock track width)
993 longitudinals in inner holes - +5mm mm (on each side)
964 longitudinals in outer holes - +30mm (on each side)
993 longitudinals in outer holes - +35 mm (on each side)
as I noted earlier in this thread some 993Cups used the 964 long. in the outer mounts on a n/b w/ the same wheels as w/ 993 long. in the inner mounts
the cars that used the outer mounts were the 964 3.8RS, 993RSR and 993GT2 evo
all of these used 9 to 11" front wheels
05-01-2017, 09:36 PM
#5
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Hopefully this isn't thread jacking, but has anyone actually moved the front suspension location inwards one slot? I think the narrow body cars start out in the middle, with most people going to the outboard slot/hole for the wider track, but there's also a slot/hole inboards as well?
05-07-2017, 09:38 PM
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There are only three holes - the center hole is used all the time. The move is only one bolt hole either way. To do what Don is talking about would require four bolt holes. Not there.
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05-09-2017, 12:51 PM
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I thought that is what I was referring to, that there is one bolt hole either way, not that there is a fourth bolt hole.
05-09-2017, 08:17 PM
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Don, no - you talked about moving the suspension inward from the narrow body setting. There are no other inside bolt positions.. This can't be done as there are only 3 holes to use - narrow body uses the 2 bolt holes on the inside. There are no other inside bolt holes. Wide body uses the 2 outside holes leaving the 1 inside bolt hole open that is used for the narrow body suspension setting. only 3 holes - suspension uses 2, 2 inside or 2 outside thus using the center hole in both cases.
05-10-2017, 02:30 AM
#10
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I hate to tell you but the relationship of those suspension mounting holes has nothing to do with wether a car is wide body or narrow body ..
Both cars utilize the exact same suspension mounting position only in the instance of the
RSR and possibly GT2 EVO was the track altered and then only for racing purposes to obtain the slightly wider track .
I've only seen one or two non factory independent cars go to the expense and measure of
expanding the track the move requires making adequate spacers for the brake booster as well as spacers for sway bar mounting I believe.
It takes some doing and certainly not recommended for street use...Bert
Both cars utilize the exact same suspension mounting position only in the instance of the
RSR and possibly GT2 EVO was the track altered and then only for racing purposes to obtain the slightly wider track .
I've only seen one or two non factory independent cars go to the expense and measure of
expanding the track the move requires making adequate spacers for the brake booster as well as spacers for sway bar mounting I believe.
It takes some doing and certainly not recommended for street use...Bert
05-10-2017, 09:53 AM
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Think Geoffrey understands the 964 better than the average Rennlist member - here is his comment-
The
The 964 chassis has two different mounting points on the chassis. One set for narrow body and one set for wide body. The 89 c4 might be different, I'm not quite sure on that particular year. To switch to wide body position, you need to move the suspension to the wide body, bolt the struts differently, change the tie rods, and use a wide body sway bar. This is for the front. The rears simply used a wider control arm.
If you are going to run wide body, it is better to move the suspension which changes the scrub radius than to simply bolt wider wheels with different offsets. I've done this coversion a few times.
If you are going to run wide body, it is better to move the suspension which changes the scrub radius than to simply bolt wider wheels with different offsets. I've done this coversion a few times.
05-11-2017, 08:59 PM
#14
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No biggee believe what you will , I have a factory 964 turbo , a factory 993 twin turbo, a
Narrow body 993 C2 with race suspension as well as other early platform cars I can go out to my garage and assure you what I said was correct , but thanks no problem...
Narrow body 993 C2 with race suspension as well as other early platform cars I can go out to my garage and assure you what I said was correct , but thanks no problem...
05-12-2017, 12:51 AM
#15
Nordschleife Master
We're really debating this?
The longitudinal subframe members on a narrowbody car are installed in the inner two (of three) holes on the front tub unibody. On a factory widebody car, they're installed on the outer two (of three) holes in the unibody.
On the top mounts, they are rotated 180 degrees in narrow vs wide to move the mount inward or outward.
Really basic stuff.
The longitudinal subframe members on a narrowbody car are installed in the inner two (of three) holes on the front tub unibody. On a factory widebody car, they're installed on the outer two (of three) holes in the unibody.
On the top mounts, they are rotated 180 degrees in narrow vs wide to move the mount inward or outward.
Really basic stuff.