2017 prep - Weight results for my TIs

[anassa]

Originally Posted by Baas 009

Thank you for comments!

323ti and 318ti rear end have almost all parts different. Only common parts are rear beam (which attaches to body) and brakes (discs, pads, calipers). All other parts are different, at least for number.

Yes, Hawk pads can be ordered from America also, but added toll + vat rises the price to sky. That's why I prefer getting parts inside EU ad there is no VAT and toll on that case.

Maybe i'll do project topic, but where it should be located? I haven't noticed particular subforum for projects?

Ohhhh ya the VAT and toll, totally forgot. I guess we should count our blessings here.

How are the 323ti and 318ti so different!? They use exactly the same trailing arm rear end, do they check the part numbers for if you wanted to do the swap? How detailed do they get?

I had the same questions about a project subforum when I first started, there seems to be no real project subforum so it seems many just post under lounge/general since it probably gets the most views. Or if its a engine/brake etc build they put it under those subforums.

[samdemange]

the 323 ti have reinforced trailing arm
and a 188 3.07 diff

[BlackBMWs]

Sam, 3.07 LSD?


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[samdemange]

no because they have the ASC/T systeme
( produced from 98 to early 2001)

[anassa]

Wow, didn't know there was that much difference. Interesting.

So 323ti:
- Med case diff
- reinforced trailing arm
- ASC/T system (?? Wondering how its different then the stock 318ti traction control.)

[BlackBMWs]

Originally Posted by anassa

Why the choice for 3.25LSD? Just ratio wise, its a great ratio from what I can see, not dogging it all, I won't mind it myself, but why not 3.46?

Are you doing anything to reinforce the rear? Garagetastic seems to have a simple way to convert to a dual ear that might help some of the twisting that will happen with a single ear.

https://store.garagistic.com/e30-secondary-diff-mount

I have thought about going with it eventually.:

Thanks for the dual ear link. On my shopping list. Has anyone tried this with their TI?

I went with a 3.25 just to get a longer leg in the straights. My 3.45 with my suspension gave me enough for the twisties, but I was running short on the straights. The S52 should help a bit with that and if the 3.25 is not quick enough, I will swap it out and save the 3.25 for a street six I will put in the Cali.

[samdemange]

Originally Posted by anassa

- ASC/T system (?? Wondering how its different then the stock 318ti traction control.)

the only difference between a 318 ti is that the reduction of the power ( phase 2 of the system ) is managed by a second "inverted body throttle" upstream from the main BT

[BlackBMWs]

Originally Posted by samdemange

the 323 ti have reinforced trailing arm
and a 188 3.07 diff

Sam, good morning! Is the Subframe assembly different on the 323 other than the trailing arms? Are the hubs and brake assemblies different as well?

[samdemange]

hi rich
the subframe is the same for all ti an Z models ( exept M )
http://fr.bmwfans.info/parts-catalog/33311090957/

the output flange are specific
http://bmwfans.info/parts-catalog/E3...ension_gasket/

like the output shaft
http://bmwfans.info/parts-catalog/E3...haft#1229582_1

like the trailing arms
http://bmwfans.info/parts-catalog/E3...ion/#1095125_7

but i think its just because they are reinforced

the brakes are the same (272x10)
http://bmwfans.info/parts-catalog/E3...ad_wear_sensor

with this i can say that all parts are exchangeable and can fit with a little adaptations for certain

[BlackBMWs]

Do the trailing arms benefit materially from the reinforcement?


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[samdemange]

i cant tell you because i havent tested without
but i know that its a usual modification for rally car
they go much further in F2000 category

[Baas 009]

Originally Posted by BlackBMWs

Sam, good morning! Is the Subframe assembly different on the 323 other than the trailing arms? Are the hubs and brake assemblies different as well?

Yes, wheel bearing is different, so the driveshafts and hubs are also different.

And why this all of differencies, the law says that maximum power for car is 20% more than the most powerful version in model series, in this case 323ti.
Then it's required to upgrade the chassis and brakes to same level than most powerful model.

Some very fast e30:s here have just standard trailing arms with no problems. Those can have alignment adjusters but no reinforcements in arm despite of using coilovers. So the deflection of trailing arms probably is not a problem.

[BlackBMWs]

Originally Posted by samdemange

i cant tell you because i havent tested without
but i know that its a usual modification for rally car
they go much further in F2000 category

Ya definitely beefier... interesting...

Originally Posted by Baas 009

Yes, wheel bearing is different, so the driveshafts and hubs are also different.

And why this all of differencies, the law says that maximum power for car is 20% more than the most powerful version in model series, in this case 323ti.
Then it's required to upgrade the chassis and brakes to same level than most powerful model.

Some very fast e30:s here have just standard trailing arms with no problems. Those can have alignment adjusters but no reinforcements in arm despite of using coilovers. So the deflection of trailing arms probably is not a problem.

Well, there you go, I learned something new. Is the law for production models or for the Rally class? I suspect the former.

If so, where does that put us who have S52's in the cars as far at that ratio, seeing the 3.2 S52 has higher power output that the 2.3 M52? A math formula I can figure out, but wondering how the law sees it?

[anassa]

Originally Posted by BlackBMWs

Thanks for the dual ear link. On my shopping list. Has anyone tried this with their TI?

I went with a 3.25 just to get a longer leg in the straights. My 3.45 with my suspension gave me enough for the twisties, but I was running short on the straights. The S52 should help a bit with that and if the 3.25 is not quick enough, I will swap it out and save the 3.25 for a street six I will put in the Cali.

Ahh I see ya that makes sense. I think with a 3.46 diff top speed is around 140? If I push my car a little its a during a quick canyon sprint on a very tight road so I get up to maybe 80mph max, most is 30-60, so the 3.46 works very nicely, but some longer legs for just cruising is nice too.

As for the dual ear conversion some member posted up the link of someone doing an LS1 swap 318ti:
https://www.youtube.com/watch?v=9QnNrhNOfxw
I forgot how I found out but around 9:45 mark you see he has it done for his car and he makes 400hp, but of course I have no idea how long it would last or help. For me I will probably just do it for some extra safety.

Originally Posted by samdemange

the only difference between a 318 ti is that the reduction of the power ( phase 2 of the system ) is managed by a second "inverted body throttle" upstream from the main BT

I'm pretty sure I had the second inverted throttle body on my 318ti too.

[anassa]

Originally Posted by Baas 009

Yes, wheel bearing is different, so the driveshafts and hubs are also different.

And why this all of differencies, the law says that maximum power for car is 20% more than the most powerful version in model series, in this case 323ti.
Then it's required to upgrade the chassis and brakes to same level than most powerful model.

Some very fast e30:s here have just standard trailing arms with no problems. Those can have alignment adjusters but no reinforcements in arm despite of using coilovers. So the deflection of trailing arms probably is not a problem.

Interesting, we don't have any kind of power laws needing better brakes or reinforcement but at least for the brakes it might a good idea lol.

Most people in the U.S. seem to just use the e30 driveshaft + medium case diff (188?) with a m52/s52(US) and it works well enough. Even for those who push more power.

As for the brakes, doesn't the e36 328 just run vented front brakes but otherwise the caliper/rotors are basically same size? If so then the 318ti brakes should be fine for m52 at least.