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I overhauled the original rear suspension arms in my 2005 S1 with all new S2 arms last night and did a detailed comparison. There is only one noteable physical difference that I could find. The center rod diameter on the rear tie-rods/toe-control links increased 0.070" and they are noticeably heavier. Pretty sure they bulked those up due to complaints from road track racers that the S1 rear toe links would get bent too easy in minor wheel-wheel contact. Otherwise everything else including ball joint sizes, bushing sizes, arm lengths, etc. were all identical to a tee. Other than the toe-links are far as I can tell the only major changes to the suspension links are the part numbers ...
Originally Posted by ASH8
New Rear Suspension Control Links (Rods) Upper/Lower and Trailing Ball Joint wrist area increased in Diameter/Size
It is a bit like front lower control arms (Wishbones) between S1 and S2, different PNs.
Same with NC, different part numbers.
When I compare NC and S2 lower front wishbones there is no difference in physical appearance, none, they even use the exact same bolts and nuts (PN) to mount in every 3 positions, but where the difference is in the bush (rubber insert), again identical to look at between the two but the rubber compound is harder in the S2 when compared to the NC.
I physically compared the actual arms of each directly myself. They are not like that comparison at all. My S1 arms look like the one on the left. Those may be non-Sport links or something. I have a 2005 6-port/speed Sport-Suspension Base model (no DSC, 12/2004 build date). Even on the toe-control links the head and bushing ends are the same, just the larger OD center tube on the S2 link. S2 arms are all installed.
bushing durometer or internal design could be different, grease in boot could be different, paint spec could be different, steel type or treatment could be different, supplier could be different, etc.
I can. Didn't think to since I don't have S2 axle assemblies to measure.
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I have...
Mark, post some S1 axle pics showing where you took/take your measurements from and each of the diameters in mm, I can post what the S2 sizes in same areas, from memory I think it is about 1 or 1.5mm larger in diameter for the manual transmission S2 RX-8's, with no changes for the Auto's.
Have not got Mazda epc handy at the mo.
The rear wheel bearing size (part no.) are identical inner and outer race at rear alloy hub, even though these hubs themselves were upgraded for the S2.
At the diff spline end of axels the two diff housing oil seals have not changed,
and afaik internal Diff spline coupling are the same.
Axle Boot, Clip and Grease kit packs have changed for S2 MT's.
When I looked at an axle last night there were so many different diameters I just said screw it. Did mean to take a pic of the S1 rear link ball joint ends and it slipped by me. Will do another time.
Hey Ash, 9K, Has anyone compared front springs between S1 and S2 yet? Can't seem to find anything.
My S2 seems to sit higher than my S1 with Koni yellows on the S2 and the stock S2 shocks on the S1. I just switched the shocks between the two front setups.
As OEM replacements all the part numbers are different between S1 and S2 Shocks and Springs front and rear, sorry I have not physically compared between S1 and S2.
I have only compared my S2 Tokico (Sport) between S2 Bilsteins (R3) and also my NC2 MX-5 (Miata) Bilstiens.
From what I can recall from discussions years ago in here with Mark (Team) is the S2 Fronts will fit OK on S1, but the rears have/use a slightly different perch position of the Spring to the rear tower bodywork area.
In MY S2, I have compared my OEM Sport (Tokico) set up for my 18 inch wheels to the S2 Bilstein shocks (which I have as new spare parts) for 19 inch wheels.
All I can tell is the alloy Spring perch plate position on Bilstein shocks are just under 1/2 inch difference for the larger 19 inch R3 wheels between the perch plate and the lower shock mount eyelet bolt.
Thanks, Ash. I guess I will have to pull one spring off of each car and compare and may do a little measurement otherwise to see why the levels are different. I know Jason Isley (Ullose) said years ago when he was winning the SCCA Solo championships, that he had accumulated a number of stock springs and selected the shortest for his car as there was that much difference in tolerences.
It may be a little while, but I will report back with my findings for clarification.
Could someone give me the injectors flow of a 2010 RX8 R3? I know there are 4 injectors, 2 green and 2 dark red by cons I found nothing about their flow.
Think that it is enough to resize for a reprog or box E85 (Ethanol)
12-30-2014, 03:50 AM
almost looks like the supposed S1 link below wasn't inserted fully in the arm center tube
