Just got TT now need to get power down to the road
 

Just picked up my car with TT conversion, oh my god what fun! I knew the cars stock deficits would pop up (09 base manual). So it hits boost, rear starts spinning..usually starts to swing to the left. I suspect the base rear is the culprit. So anyway, spending my savings on the TT what (in order of importance) should I concentrate on piece by piece to get the power to the ground. Looking for sport driving/trackdays versus drag racing.

Thanks!
Alan

Good tires and alignment with minimum negative camber helped me a lot in my 500+ whp Z

An LSD would help a lot!

LSD is the first place to upgrade.

Oh yeah, lsd is a must.

Just got TT now need to get power down to the road
 

LSD and new diff bushings, then start replacing all the rear mushy rubber suspension bushings with SPL camber, toe and traction arms.


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Thanks everyone, seems Quaife is one of popular ones and for once the base coupe has an advantage as doesn't need modifying to accept the change. I will read up but is the diff conversion best left to pro's (shims, backlash, etc) or is it a relatively straight forward install?
Alan

mine was straight forward,,,just be sure & replace bearings,races,seals & bushings....and use proper torque.
if you've never set up a diff. or had the pumpkin/crossmember bushing out,,,,pay someone.

I'd be getting that open diff out pretty quick,,,can be very dangerous/un-predictable.

I will pick up/install ASAP, until then just need to control my right foot. Of course I will do the bushings at the same time, gotten good at those since i've just replaced all rear subframe, control arms, etc. on E46 BMW 3 series..in excess of 20 bushings, many rather large. Those cars have a reputation for stressing/cracking of the unibody where the rear diff carrier mounts. They make a weld in reinforcement kit that I also installed, I haven't read of any problems with metal integrity on the 370 so hoping thats not an issue.

Good deal; my ~Z~ is N/A & Quaife was first real mod/after car decided to change lanes on its on...if tires broke loose on a straight-Away...the one with the least amount of weight would spin faster & if they decided to swap sides,,,you could change lanes in a heartbeat!http://uploads.tapatalk-cdn.com/2016...4b5974a8c2.jpghttp://uploads.tapatalk-cdn.com/2016...0ea83d6bb6.jpghttp://uploads.tapatalk-cdn.com/2016...2ac395f8a8.jpghttp://uploads.tapatalk-cdn.com/2016...cb75a7c48f.jpghttp://uploads.tapatalk-cdn.com/2016...3b032863b4.jpg
Came out in 3 pieces (-oil) with homemade puller in front yard.
I'm going to bed...enjoy the TT & upload some pics


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Thats EXACTLY what its doing, random lane change..I make sure no one is around on multi lane blvd's when really kicking it. After the ghost lane changes I've decided to quit that altogether and enjoy the turbo noises!

I can relate to your pics, I changed all the BMW bushings with sockets, pipe, all thread, freezing bushings, etc. I have some sockets now that won't serve any other other purpose than changing BMW bushings after modding and welding on them..and I can tell you that will never happen again (on that car at least)

One more option that you may want to consider, is upgrading the rear cover.
I got my stuff from Z1 Motorsports & the offer a rear cover upgrade kit/ which holds more fluid,has cooling fins & comes with everything you need for installation.(including fluid)
Those are great people to work with & I'm thinking the Quaife is on sale right now there.

Synolimit loves the EavetrC diff and he does a lot of tracking

But like everyone else said
More tire, better tires
Coilovers and everything SPL for full adjustability.
Diff and subframe bushings

Get a Wavetrac LSD. It is better than the Quaife.

I do not track my car; i go to the dragstrip,perform burnouts,drift,etc.....& i have very little negative rear camber....tire wear is exactly the same on both rear tires/inside & outside.
I can only speak for what i have (Quaife) it's working for me......about 7500 miles on it.

The problem comes when you lift a rear tire or loose traction on one side. It is a common issue with Torsional diffs. The Wavetrac has a device to help prevent this. Some good reading on it.

I have Wavetrac and it has been an awesome upgrade. I can tell you that it functions well on the street and at the track. Wheel spin and fish tails are very predictable as well. If you are going to track you need to get stiff front sway bar as well...I recommend Hotchkis!

Thanks everyone, I will read up on all..I'll have time as I need to save up some $ If anyone in Maryland area or close I'll be posting up my 2014 KTM 1290 Superduke in the for sale section soon to stop the bleeding and allow me to save some cash.
Alan

Yeah but how many people can regularly tripod their Z? Quaife is good Wavetech is better if you find yourself getting one rear wheel airborne in turns.

I can do that easily. I also happen to live extremely close to the tail of the dragon. I will pick a wheel up enough to unload the inside wheel quite a few times. Also, the correct line through turn 3 at Road Atlanta will have your inside wheels off the ground.

And the OS Giken is the best for every situation.

Lol, I don't know if you are boosted and what the roads and race tracks are like were you live but I can tell you this your rear tires leave the road surface a lot more than think. Under hard acceleration a small bump in the road will cause one or both tires to leave the surface. What can happen is that all the power goes to one wheel and that can become a problem real fast especially if the car is not pointed in a straight line!

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Oh and I do this every time I dive into my driveway because it is at a significant incline and I have to take it at slant. :p

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The only downside to OS Gikin is the maintenance, but I agree it is the best of three diffs mentioned for full time track purposes.

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The maintenance really isn't that bad though. It's just fluid changes for the majority of the time, with maybe a rebuild every couple years, depending on abuse levels.

I think most of us that are over the top with our relationship with our cars consider maintenance as part of the fun of having a specialized ride! :eek:

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Exactly. Having fun isn't cheap with these cars!

I pay for Smiles per mile. :)

Everytime I track. Have to bounce over the inside curbing for the correct line. :driving: