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Discussion Starter · #1 ·
Ok my car is at Peters getting the ATS Carbon 1.5 way LSD with Central 20 3.9 Final Drive Ratio and Finned Diff Cover installed plus the 14.1" StopTech Front and Rear Big Brake Kit.

Diff: Stock diff doesn’t have enough locking force to transfer the traction from one tyre to the other; the 275 S03s are proving too much for it. I also want more predicability and increased handling.

Brakes: I can overheat the stock touring brakes are not suited to spirited driving and I have experienced this first hand numerous times. I want absolute reliability here with no fade, I want to be able to jump on them time and time again and know that my stopping distances aren’t going to change. So predictability and increased braking performance is what im after.

Final Drive: I want to feel the car to pull harder and I will be using this to fill the torque hole created by the big cams I have planned plus the increased rpm limit.

I'll let you know my impressions when I get the car back.

Took some photos :)

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:OMG:

:bow: :bow: :bow: :bow:

Looks like you're on the right track! :yourock:

Keep us updated on the installs and we're definitely going to need some reviews! :thumbsup:
 

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Lookin' good.

Let us know how the ATS LSD goes. When I get my new shoes, I'll be running wider tyres too so its a concern for me.
 

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My issues

1/ Every time I took a corner with speed I would find that the backend would step out with out fail.

2/ Coming into a sweeper the backend would feel like it would twitch and then settle. This f'in scared me everytime

3/ Driving up my drive way one wheel would lift and the other would not get power.


1/ Resolved
2/ Resolved
3/ Resolved

Took it up Pac Hwy the other night and this thing is f'in awsome. Corners that I would hold 3rd because of traction issues now I can take in 4th. There is absolutely no noise/clunks or vibrations in fwd or reverse. Worth every penny.

No fitment issues. Backlash needed to be adjusted and thats about it.

Michael
 

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What was the resolution for the dorifto?
 

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Discussion Starter · #9 ·
Ok these are my initial impressions based on a lot of driving I did last night. If you want to know anything else about them let me know. Also its good to ask again at a later date as peoples impressions change over time and you can see if their thoughts have change with them.

Diff: Stock diff doesn’t have enough locking force to transfer the traction from one tyre to the other; the 275 S03s are proving too much for it. I also want more predicability and increased handling.

Result: The diff is basically undetectable as far as noises etc go, it made a some noise in the car park before I did 30mins of figure 8s (slight headache and mild dizziness) for the break in procedure and I now have to do 500km then change the oil and then it should be totally silent. It is basically totally silent now as I’ve only heard in once in one car park and i've been in and out of driveways etc a number of times. Driving with it is like Michael mentioned, you can accelerate through corners one gear higher than you normally would, so the addition speed you can carry through corners is great and totally predictable. The difference can be easily felt in all corners and the change is great, this is a very good diff which needs to be used on the street or track and it was exactly what I was after plus more as the improvement in handling is substantial.

Brakes: I can overheat the stock touring brakes, they are not suited to spirited driving and I have experienced this first hand numerous times. I want absolute reliability here with no fade, I want to be able to jump on them time and time again and know that my stopping distances aren’t going to change. So predictability and increased braking performance is what im after.

Result: The brakes look a million dollars, you get allot of people walking up to the car, looking at the car etc even more than before. I did the bed in procedure for these as well, 100km/h to 15km/h 10 times, cool off driving without using the brakes and then another 100km/h to 15km/h then cool off driving, finding a suitable place to do this was difficult. Before I bed in the brakes I did a series of hard stops and pulled up to the lights in traffic with smoke pouring off all wheels, which I thought was pretty cool :) The pads im using are street performance pads not track pad and they are totally silent, I haven’t head one squeak or anything from them or the brakes, we'll see how they are with regards to dust after a while. Now regarding the performance, I can tell you right away that the stock brakes have on nothing on these things, it doesn’t matter what speed you are going, you can slam on the brakes and speed is shed with intensity, time and time again. These brakes are fantastic and exactly what I was after.

Final Drive: I want to feel the car to pull harder and I will be using this to fill the torque hole created by the big cams I have planned plus the increased rpm limit.

Result: Cruising on the freeway although I know the revs should be higher I can’t tell through feeling or sound if they are, there’s no increased engine noise, no droning, no revving etc on the freeway. Performance wise the car pulls noticeably harder in every gear, probably more so than any other engine mod so far but it would be very close but with this its consistent all the way across the rpm range and at any speed. I really like the increased pull and shifting quickly through the gears, it feels more purposeful and it doesn’t feel like im waiting forever for the car to speed up and go through the gears, im not sure if this will change once I get used to it or not though. Once I get cams installed we’ll see if this helps fill in the bottom end, ideally I should have done it at the same time but as I was having the diff changed it would have been a waste to wait.

Lowering Clutch Engagement Point: The stock engagement point was too high.

Result: Initially to push the clutch pedal down feels a bit weird, its stiffer but it feels like you pushing on stiff foam so it feels like its a bit slower in returning to its position when take your foot off, but this is after the clutch has engaged so it doesn’t matter. The clutch engagement point is definitely lower allowing quicker, easier and smoother changes. Before I would have to lift my whole leg before it would engage at the top of its travel, so this is a big difference and I think it’s similar to how the car should have been setup from the factory.



Together: Now these mods individually all give good noticeable improvements in their different areas but together they totally transform the car. The cars abilities are a lot higher than before and when you go for a hard drive it extremely apparent as everything is done quicker and more precise. Accelerating up to the corner at full speed, braking super hard at the last second, driving through the corner at speed one gear higher than before and powering out of the corner up to the next.
 

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murray:

thanks for the nice write up.... it is really good to hear that you like the new final drive... it will be even better with the new cams I would say!!!

cheers and enjoy it!

richie
 

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I think I will only know when I swap out the final drive... :)

Please do give us some long term report on that so-called BEST N/A mod!

cheers,

richie
 

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Top speed drops (but, at 250km/hr, who cares if you lose a bit off that?). Speeds in-gear drop, so you might want to get your speedo recalibrated.

And because you're doing more revs for the same speed, your fuel consumption goes up.
 

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I believe you should'nt need to recalibrate the speedo as the speed sensors are at the wheels and not on the gearbox as they use to be.

PS I've order the very same ATS 1.5 Way Carbon LSD, I can't wait to see the difference it makes, plus fitting some Toyo RA1's on next week should be good for Sandown in two weeks.

Cheers :cheers:
 

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Discussion Starter · #17 ·
Top speed drops from around 300km/hr to around 270km/hr. But there is a speed limiter at 250km/hr you have to get past first and even then our cars dont have enough power to actually reach 300km/hr, but I bet you it can reach 270km/hr now with the extra torque its got. :)

I personally dont see loosing 30km/hr from 300km/hr as a problem when the car is in NA form, you cant reach 300km/hr unless you've got FI and even then you most likely wouldnt really be considering the FD.

The good thing is it only cost AU$580 landed vs the US$1100 for the 350EVO one, so this is easily the best bang for your buck mod possible.

Ive been up and down the motorway a couple times now and I can tell the revs are increased when you start getting over 110km/hr. So once you start going over this speed the extra revs will lead to more fuel consumption, but around town stopping and going I bet your fuel consumption might actually decrease because you dont need to work the motor as much. That said though I personally dont think about fuel consumption when talking about modifiying my car, although fuel is expensive at the moment.

I am however getting a slight whine noise from the final drive when its under load, so im getting it checked out next week after we change the diff oil. Will keep you updated.
 

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Discussion Starter · #18 ·
Originally posted by ZTRACK@Sep 16 2005, 06:15 PM
I believe you should'nt need to recalibrate the speedo as the speed sensors are at the wheels and not on the gearbox as they use to be.

PS I've order the very same ATS 1.5 Way Carbon LSD, I can't wait to see the difference it makes, plus fitting some Toyo RA1's on next week should be good for Sandown in two weeks.

Cheers :cheers:
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David, you going to love the diff, its one of the best handling modifications ive done, its up there with coilovers. But you would probabally need coilovers first to get the most from it.
 

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I'm still waiting for my wheels to arrive.

But, after that, I'm wondering if I go coilovers or LSD? Probably the latter, since the Konis and swaybars are doing a good enough job.
 

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Sounds like a good noise, the whine noise if from how much lash have you got between gear and pinion (terminology might be off). When you have more lash it whines more, when you have less it's quieter but it also produces more heat.
 
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