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Capitalist and Patriot
 
911Freak's Avatar
 
Join Date: Sep 2006
Location: West Los Angeles
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Question 930 stock frnt sway bar size??

Hey guys,

I'm considering buying a stock front sway bar, off of a mid 80's 930..

it's the "non-drop link type" and I plan on using it on my SC...

Anyone know what size the 930's came with stock?

are all the 80's 930 oem sway bars the same size?

the seller doesn't know, and the bar is in his storage so he can't get to it to measure it....

I really appriciate any info you guys could give me
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'81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold) , '68 912 Targa (sold) , '69 911E (sold)
"Dream it, Believe it, Decide it, DO it "
Old 03-22-2008, 01:07 PM
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I believe the front bar size is 22mm. There may even be a "22" stamped into the end of the bar.

Blaine
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1988 Porsche 930 Factory Slantnose- B&B Headers, GHL dual exhaust, K27-7200, Tial WG, B&B Intercooler, RSR Coilovers, Poly Bronze bushings. Dynoed at 373 hp/389 tq
1974 Porsche 914 2.0 Phoenix Red
2011 Porsche Panamera Turbo
Old 03-22-2008, 08:03 PM
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Quote:
Originally Posted by Blaine Sellie View Post
I believe the front bar size is 22mm. There may even be a "22" stamped into the end of the bar.

Blaine
22? sweet

That will help quite a bit considering my stock SC is only 18mm

I will have the seller check and take a picture..

Thanks Blaine
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'81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold) , '68 912 Targa (sold) , '69 911E (sold)
"Dream it, Believe it, Decide it, DO it "
Old 03-22-2008, 08:11 PM
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Are you trying to increase understeer. Putting on a larger front bar without changing the rear will increase understeer. You should always try to keep things relatively matched to keep the handling balance of the car.
I can try to measure my 79 930 front bar and post data for you later today, Ijust removed mine to install Smart Racing bars.
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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 03-23-2008, 09:20 AM
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Sway bar info.........

Turbo Front sizes are-

pre 77: 18mm
78-84: 20mm
85-89: 22mm

Turbo Rears are-

up to 84: 18mm
85-88: 20mm
89: 18mm
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1988 Porsche 930 Factory Slantnose- B&B Headers, GHL dual exhaust, K27-7200, Tial WG, B&B Intercooler, RSR Coilovers, Poly Bronze bushings. Dynoed at 373 hp/389 tq
1974 Porsche 914 2.0 Phoenix Red
2011 Porsche Panamera Turbo

Last edited by Blaine Sellie; 03-23-2008 at 10:30 AM..
Old 03-23-2008, 10:26 AM
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Quote:
Originally Posted by fredmeister View Post
Are you trying to increase understeer. Putting on a larger front bar without changing the rear will increase understeer. You should always try to keep things relatively matched to keep the handling balance of the car.
I can try to measure my 79 930 front bar and post data for you later today, Ijust removed mine to install Smart Racing bars.
That's a good point. I 'm also increasing the rear sway bar size, as soon as I can find one and also determine the sizes of these also...

I'm trying to keep costs low, so if I can gain an improvement with larger fr & rear sways; while still not investing large $$ in an adjustable set (eventually will do, as soon as my skills justify) I'd like to go this route....

If you could measure yours that would be great! (rear size too?)

I was also told; according to pelican tech. the stock size of the 930 front sway bar is 20mm, while another has confirmed they are stamped with 22

My SC has 18mm rear and I think 20mm front.

I'm thinking there is probably a difference due to model years

I'm still trying to get the same info re: 930 rear sway bar size too....

Thanks again for any assistance
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'81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold) , '68 912 Targa (sold) , '69 911E (sold)
"Dream it, Believe it, Decide it, DO it "
Old 03-23-2008, 10:34 AM
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Quote:
Originally Posted by Blaine Sellie View Post
Sway bar info.........

Turbo Front sizes are-

pre 77: 18mm
78-84: 20mm
85-89: 22mm

Turbo Rears are-

up to 84: 18mm
85-88: 20mm
89: 18mm
Perfect....thanks Blaine!
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'81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold) , '68 912 Targa (sold) , '69 911E (sold)
"Dream it, Believe it, Decide it, DO it "
Old 03-23-2008, 10:35 AM
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Is it standard engineering for Porsche to design oversteer into our cars? If so, is it by way of the smaller rear TB's or sway bars... or combo of both?

I thought I read somewhere they did so as a safety measure? No?
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'81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold) , '68 912 Targa (sold) , '69 911E (sold)
"Dream it, Believe it, Decide it, DO it "
Old 03-23-2008, 10:39 AM
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They design in understeer intentionally since it is inherently safer.
I think thye really stepped this up after the late 70's when they got hammered by tons of lawsuits when the turbo 930 just came out and lots of people were getting killed. This might explain the increase in front bar size after 1984.
All car manufacturers follow this policy.....though I think the 911 inherently suffers from low speed understeer no matter what you do.
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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 03-23-2008, 12:09 PM
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