88 325 and wheelspin; lsd option?

[Erick]

wrong ;)

It was an OPTION on the 318is

Popular option though. 4 out of 5 318iS' have LSDs that I've seen.

[asubimmer]

Popular option though. 4 out of 5 318iS' have LSDs that I've seen.

yup mine was one of the unlucky ones

[gearheadE30]

Yeah, my 318is is up in STX because of the factory diff. It'd be very nice if someone made an appeal to change the rule or exempt the e30 from it, but I'm too lazy to do it myself. Turns out an e30 can be very competitive in STX anyway.

[SpecM]

LSD was an option on all e30 (if not standard).

'88 s-etas (and all etas 86-88.) have 2.93, some open and some LSD

[z31maniac]

Thanks, my question was if it could be ordered with the lsd because SCCA rules only allow me to install the lsd if it actually ever came from the factory in that configuration.

JR

ix diff is viscous, but then I believe you'd have to swap in a complete ix drivetrain.

[whiltebeitel]

ix diff is viscous, but then I believe you'd have to swap in a complete ix drivetrain.

That pretty much the way I understood it. :roll:

[dicej32]

I'm currently runnning in GS in SCCA. The Mini's will be gone from GS next year which will greatly improve chances of being competitive.

JR

[nando]

That pretty much the way I understood it. :roll:

are you sure? i think you are allowed to install an ix diff because they specifically allow VC LSD's. Also, they do not distinguish between a 325i and a 325ix anywhere in the rules or model listings.

[whiltebeitel]

*edit SCCA Solo 2009 rules:*

12.4 STANDARD PART
An item of standard or optional equipment that could have been
ordered with the car, installed on the factory production line, and
delivered through a dealer in the United States. Port-installed options
provided by the factory are considered to be the same as
those installed on the factory production line. Dealer-installed options
or deletions (except as required by factory directives), no matter
how common or what their origin, are not included in this definition.
This definition does not allow the updating or backdating of parts.

K. Limited Slip Differentials
ST, STS: No limited slip differentials are permitted except for
factory standard viscous coupler type units.

(basically allowing a specific FWD mazda to run in ST, as it came with a viscous LSD)

Stock Class:
L. Limited-slip differential, transmission and differential ratios, clutch
mechanisms and carburetion, fuel injection or supercharger induction
systems must be standard as herein defined.

So in Stock he should be able to install a factory limited slip as it could be optioned on the model he has (M20 engine), but it would require the car to be an iX or a clone thereof to do so is ST/STS.

[nando]

right, I've seen the rules. However, my point is the SCCA doesn't consider the 325i/ix to be seperate models as far as I can tell. the AWD (or parts of it) can easily be considered a "factory installed option."

[whiltebeitel]

You're free to try, but I wouldn't. It seems pretty clear that if the car could not be ordered with a iX LSD (and it couldn't if it wasn't an iX) in the States, then it's not allowable. If you ran it in ST, you'd have to fight protests from any serious guy that caught wind of it.

He's running GS anyway, so a LSD in a factory-available ratio for the eta would be perfectly fine.

[rThor432]

There were tons of optional ratios availible in Europe in standard medium case differentials (ie. for the E30). I'm almost positive that a 3.91 was availible, although it would have been a clutch diff and not a viscous diff. I'm not into auto-x for serious competition, so my take on bending rules might reflect that.. sorry if this post isnt helpful.

[whiltebeitel]

There were tons of optional ratios availible in Europe in standard medium case differentials (ie. for the E30). I'm almost positive that a 3.91 was availible, although it would have been a clutch diff and not a viscous diff. I'm not into auto-x for serious competition, so my take on bending rules might reflect that.. sorry if this post isnt helpful.

Sadly, it has to be a factory option available in the US. otherwise S50B32's might see more AX use...:)

[rThor432]

Sadly, it has to be a factory option available in the US. otherwise S50B32's might see more AX use...:)

Ha.. that's a valid point.

[Julien]

3,91 were used in german late model 325i