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Tue May 15, 2018 9:30 am |
Post subject: Impreza DCCD - RedLine heavy |
AK Site Admin

Joined: 27 Nov 2006 Posts: 20178 Location: Aberdeen
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After reading some comments from Jack - redline heavy gearoil making his diff snatchy... it got me thinking.
We changed to redline heavy shockproof in the 6sp DCCD box. This also looks after the DCCD centre diff. I also changed to a single piece lightweight prop at this time.
The changes make a big difference to the car - all of which i put down to the massive reduction in prop inertia (car a lot more prone to bunnyhopping on steering lock at slow speed - rear diff)
Car also became MUCH more understeery -liek the rear diff was pushing <locked> on much lower torque.
Anyone got a feedback from running DCCD with redline heavy before/after? Did you notice any large changes to the car?
Trying to pin point prop or fluid for the big change _________________ Impreza Race Car, 1200kg, 480bhp - SLS/SMRC
Mini Race Car x3 - SMRC, SMRC, SLS
911 - 1981 Air Cooled 3.0
500 - 1969 Fiat 500 L
X5 40d M Sport
Mini Cooper Park Lane
MB Sprinter Camper
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Tue May 15, 2018 10:26 am |
Post subject: |
AK Site Admin

Joined: 27 Nov 2006 Posts: 20178 Location: Aberdeen
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after a bit more research I think its prob more the fluid...
Will add in some modifier as a start _________________ Impreza Race Car, 1200kg, 480bhp - SLS/SMRC
Mini Race Car x3 - SMRC, SMRC, SLS
911 - 1981 Air Cooled 3.0
500 - 1969 Fiat 500 L
X5 40d M Sport
Mini Cooper Park Lane
MB Sprinter Camper
Track Scotland |
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Tue May 15, 2018 10:51 am |
Post subject: |
Steviej user
Joined: 23 Jan 2014 Posts: 145 Location: Elgin
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This has me thinking, my car has more understeer than id like and have wondered if the rear lsd is too tight, it has heavy shockproof oil in it too, so maybe that's a factor.
Would adding friction modifier to the oil give it more "slip" similar to less preload on the plates ?
I also see that redline do a 85/110 lsd shockproof oil with friction modifier. |
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Tue May 15, 2018 12:03 pm |
Post subject: |
AK Site Admin

Joined: 27 Nov 2006 Posts: 20178 Location: Aberdeen
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yup, i'd expect it to add a little slip to the initial lock.
It feels like the DCCD (plates) are snatching on ours, so looking to add a little slip to make it less grabby
RedLine suggest adding 1oz at a time. No idea if they say that for a 1.5lt diff or 4.2lt gearbox though LOL
I'll give it a go - the car felt nice otherwise, just had to adjust setup - Clarks esp _________________ Impreza Race Car, 1200kg, 480bhp - SLS/SMRC
Mini Race Car x3 - SMRC, SMRC, SLS
911 - 1981 Air Cooled 3.0
500 - 1969 Fiat 500 L
X5 40d M Sport
Mini Cooper Park Lane
MB Sprinter Camper
Track Scotland |
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Tue May 15, 2018 12:11 pm |
Post subject: |
Steviej user
Joined: 23 Jan 2014 Posts: 145 Location: Elgin
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I saw that, they say add up to 4% or 6% for the heavier shockproof oils
I'll try some in it and see, its pretty noisy / clunky driving it round the pits which makes me think its set quite tight. |
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Tue May 15, 2018 2:53 pm |
Post subject: |
AK Site Admin

Joined: 27 Nov 2006 Posts: 20178 Location: Aberdeen
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Its prob not the diff being shimmed tight, but the non slippy thick oil  _________________ Impreza Race Car, 1200kg, 480bhp - SLS/SMRC
Mini Race Car x3 - SMRC, SMRC, SLS
911 - 1981 Air Cooled 3.0
500 - 1969 Fiat 500 L
X5 40d M Sport
Mini Cooper Park Lane
MB Sprinter Camper
Track Scotland |
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Tue May 15, 2018 5:35 pm |
Post subject: |
Steviej user
Joined: 23 Jan 2014 Posts: 145 Location: Elgin
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I have a couple of things I want to try so have booked the track night on the 31st, are you home for it ? |
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Wed May 16, 2018 12:45 am |
Post subject: |
Jackstrath user
Joined: 25 Jul 2012 Posts: 332
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Just a update from me, Changed back to the Cusco Oil and the diff is now back to its normal self , no jumping,skipping, snatching ect a tiny bit on full lock but its always done that , before it was anything more than 2/8ths of a turn and it was grabbing |
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Wed May 16, 2018 6:38 am |
Post subject: |
AK Site Admin

Joined: 27 Nov 2006 Posts: 20178 Location: Aberdeen
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yup, my main reason for the redline heavy is to mask a synchro baulk/crunch into 4th/5th. Shift is seamless with the Redline, so will try the additive. _________________ Impreza Race Car, 1200kg, 480bhp - SLS/SMRC
Mini Race Car x3 - SMRC, SMRC, SLS
911 - 1981 Air Cooled 3.0
500 - 1969 Fiat 500 L
X5 40d M Sport
Mini Cooper Park Lane
MB Sprinter Camper
Track Scotland |
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Sun Jun 03, 2018 8:47 am |
Post subject: |
Cullenmin newbie
Joined: 30 Nov 2009 Posts: 42 Location: Moray
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How did you get on with the additive Adam?
I'm finding my impreza skipping a bit but i'm puting it down to the Kaaz rear diff. Currently got Millers CRX LS 75W 140 in there just now but going to change that to the Redline heavy.
My next step for added protection of the 6 speed dccd box was to change the oil also to redline heavy. Dont want any skipping though
Rich _________________ MY98 STi Type R |
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Sun Jun 03, 2018 10:00 pm |
Post subject: |
AK Site Admin

Joined: 27 Nov 2006 Posts: 20178 Location: Aberdeen
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I wouldnt put redline heavy in the rear diff. We use the KAAZ specifc oil in ours, seems to work very well. Didnt really skip
Havent had the car out yet! _________________ Impreza Race Car, 1200kg, 480bhp - SLS/SMRC
Mini Race Car x3 - SMRC, SMRC, SLS
911 - 1981 Air Cooled 3.0
500 - 1969 Fiat 500 L
X5 40d M Sport
Mini Cooper Park Lane
MB Sprinter Camper
Track Scotland |
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Tue Jun 05, 2018 9:17 am |
Post subject: |
Cullenmin newbie
Joined: 30 Nov 2009 Posts: 42 Location: Moray
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Ok, I’ll have a look for the kaaz oil cheers _________________ MY98 STi Type R |
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Wed Jun 06, 2018 10:15 pm |
Post subject: |
Steve H user
Joined: 19 Aug 2014 Posts: 268
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Why is the Redline oil any better than any other brand? |
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Wed Jun 06, 2018 10:41 pm |
Post subject: |
Steviej user
Joined: 23 Jan 2014 Posts: 145 Location: Elgin
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I believe that the shockproof oil is designed to spread the load across the gear teeth more, all EP oils are supposed to do this to an extent, but the redline does cling to the gears more. |
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Wed Jun 06, 2018 10:43 pm |
Post subject: |
Steviej user
Joined: 23 Jan 2014 Posts: 145 Location: Elgin
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Btw my car doesn’t have the shockproof oil in the rear diff. |
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