Daffy's SE

[Daffy]

I’m sure the Problem Child will only continue to improve mate. I’ll never forget the ride I had in it/him/her. I’m going to have to rely on you & Magpie for my thrills now. Can repay with fishing trips though.

That fishing trip will have be tee’d up very soon mate

[Gladiator]

Indeed!! Although I’m sure the fishing gods have it in for me. It always windy or I’m working.


Sent from my iPhone using Tapatalk

[Daffy]

It’s been a while since the last Problem Child update, (work, life, covid, border town life living etc). I’m starting to look into and prepare up to finally swap out the standard BMW clutch for a sprung ACT. The Noise Vibration Harshness (NVH) is not too bad and the standard BMW clutch is handling the job well, but with the driveline as solid as what it is, the NVH is taking some away from the original concept of the car being comfortable and totally streetable. My main regret is not putting the ACT clutch in to begin with making this an extra expense that could have been spent elsewhere. USD its a little under $700, so I’m anticipating that this venture is going to set me back around $1600- $1800 AUD installed.

[The American]

Is the clutch the source of the NVH?

[Daffy]

Is the clutch the source of the NVH?

As mine being high powered and according to kmiata there would be unavoidable rattle with a standard BMW clutch, I would say the NVH is MOSTLY attributed from the clutch (clutch in, rattle gone), kmiata recommendation for high powered street with track is an ACT 6 puck for better long term wear over their 4 puck option. My mistake was not reading into it better at the time of the rework to see the standard beemer clutch is best suited to something running a much lower power output, rather than what the problem child is putting out. Jim Berry (Race Clutch) had a solution in mind, but seeing as he is in the twilight of his amazing clutch build days, plus future availability (and factoring overall cost) a plug and play option from ACT seems the best go to at this stage mate.

[Okibi]

I remember car passion channel went through a stack of testing with his.

[Daffy]

I remember car passion channel went through a stack of testing with his.

Going through some of their videos this week-

[The American]

I remember car passion channel went through a stack of testing with his.

Going through some of their videos this week-

I was making my way through his videos too, and I didn’t find whether he identified the source of the vibration. Did it go away when he put the rear end upgrade in, or when he swapped from the g260 to the newer gearbox?

[ManiacLachy]

I think it was when he swapped the gearbox to the newer style with the Cadillac diff. The new setup has a bushing mount part way down the driveshaft, if I recall correctly. This allows for a change in angle as well as less vibrations. It's been a while though, I might have some details confused.

I'm not exactly sure how Daffy's is setup, I'm pretty he's got a BMW M3 gearbox, as opposed to the regular 3-series box, and he's got the Caddy diff. I'm not sure about the driveshaft though.

[bruce]

In hindsight an LS swap and all the gubbins would have been the same amount of work.

[ManiacLachy]

Except you wouldn't be allowed to drive it. That's a negative for some people.

[bruce]

He lives in Queensland where anything can be Mod Plated.

[The American]

He lives in Queensland where anything can be Mod Plated.

An LS swap in an NB can’t.

[Daffy]

I remember car passion channel went through a stack of testing with his.

Going through some of their videos this week-

I was making my way through his videos too, and I didn’t find whether he identified the source of the vibration. Did it go away when he put the rear end upgrade in, or when he swapped from the g260 to the newer gearbox?

I think it was when he swapped the gearbox to the newer style with the Cadillac diff. The new setup has a bushing mount part way down the driveshaft, if I recall correctly. This allows for a change in angle as well as less vibrations. It's been a while though, I might have some details confused.

I'm not exactly sure how Daffy's is setup, I'm pretty he's got a BMW M3 gearbox, as opposed to the regular 3-series box, and he's got the Caddy diff. I'm not sure about the driveshaft though.

When I 1st installed the ZF box (from a Z4 M), I had it paired up with the original SE diff, (the kit came with a driveshaft made for that set up), there was also a rock hard bushing mount that after the install was pretty bad for NVH. We swapped that out for a similar softer GM mount that did make a significant difference. Hindsight and reading through the variations of clutch options at the time would have been a wiser move on my part to realise that a sprung ACT clutch would be both stronger than the standard beemer clutch, further reducing the NVH with the single mass flywheel, (Reading through a few of the beemer forums indicate the same issue.) Time will tell when I finally get around to pick up and install the ACT option.

The driveshaft had to be modified as well as adding the sonnax yoke after installing the caddy diff.
I have noticed a difference too since the heavier flywheel has been swapped out with the lighter one in the conversion kit (the near 9kg wheel vs the 6ish kg wheel) that has made a difference to the torque the Problem Child puts down now as a result- but I can’t be sure if this adds or retracts any to the NVH in anyway.
Here’s one link for some discussion on a beemer forum RE the sprung v unspung debate. I did also look into a Giubo after a conversation with JBT, however after discussion with mechanic Daz, this was not an option to assist with reducing NVH.

https://www.1addicts.com/forums/showthr ... ?t=1417199

[Daffy]

I drove the Problem Child to work yesterday on an afternoon shift thinking that when I finished work after 10pm I could have a relaxing top down balmy night drive after I finished work. Normally I would turn off where I know of a couple of nice tight corners that eventually lead onto a motorway to stretch the Problem Child’s legs before getting home. However, on the drive south to home where sticking on main road incurs a ridiculous amount of stop start sets of traffic lights, I pulled up side by side with a stunning top down shining red 2020 Ferrari F8 spider GT being dríven by a very happy looking fella. Needless to say the original plan of the turn off into the back roads was scrapped. The roads were (mostly) clear, and as usual, just about every set of lights on that run south were red as we approached, but for a good 20 odd minutes both the F8 and Problem Child had a nice little duel of 2nd, 3rd and into 4th sprints! The best run was when we got a proper side by side rolling start from second (the Problem child was sitting on the sweet on boost spot at 3800rpm at this stage and it was on from there into 3rd and a way into 4th before we had to back it down on approach to another set of red lights. Both cars were loud, side by side all the way and engines roaring that mighty roar. When stopped at that next set of red lights, between us both having a laugh, the guy said “mate, I put it all the way down and I couldn’t pull away from you!”
Now I’ve had plays on several occasions with other cars I consider all class, but that little sprint with the F8 and his comment had put the biggest smile on my face and made me fall in love with the Problem Child all over again!