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2G New rear rotors too small

Posted by MasterMatt209, Aug 25, 2018

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  1. MasterMatt209

    MasterMatt209 Proven Member

    422
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    Joined Jan 17, 2015
    Danville, Indiana
    5F8E0604-5125-4E41-B70A-ED206A7FA50D.jpeg So it’s 3 in the morning and I’m changing the rotors and pads on my Talon and I’m going to attach a picture of the new and old rotor. I got a kit for AWD but the new rotor is small. Do I run it? Can I run it? What’s the deal
     

    388  1

    1995 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM

    514  3

    1995 Eagle Talon TSi AWD
    awd · automatic · 2G DSM

    Street Build 880  0

    1998 Mitsubishi Eclipse GSX
    automatic · 2G DSM
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  2. Kryndon

    Kryndon Proven Member

    334
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    Joined Jan 10, 2014
    Bulgaria, Europe
    I can't see from the picture, but is your old rotor thicker and ventilated? If so, and judging by your Talon being 1995, it could be the rare '1994' big rear brakes edition (reference this thread http://www.dsmtuners.com/threads/early-95-rear-brake-thread-discussion-pn.469725/ ).

    If that IS the case, then you can't really run the new (smaller) disc, because the pads wont make full contact and you'll go through them quicker and it's just not gonna be a good setup. Also there is a difference in how far out the caliper sits. Just return the disc and look for the 284mm (20mm thickness) disc, part numbers are listed in that thread.
     

    Street Build 3K  9

    1997 Eagle Talon TSi AWD
    14.769 @ 92.22 · 2G DSM
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  3. MasterMatt209

    MasterMatt209 Proven Member

    422
    26
    Joined Jan 17, 2015
    Danville, Indiana
    Wow thank you for the reply, yes you must be exactly right. They are thicker and ventilated. Thank you for the info man
     

    388  1

    1995 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM

    514  3

    1995 Eagle Talon TSi AWD
    awd · automatic · 2G DSM

    Street Build 880  0

    1998 Mitsubishi Eclipse GSX
    automatic · 2G DSM
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  4. Kryndon

    Kryndon Proven Member

    334
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    Joined Jan 10, 2014
    Bulgaria, Europe
    No problem! I was actually reading about this a few days ago so the info came in useful here. Just keep in mind the brake pads are also bigger (taller) so you'll have to get those as well. Use the other thread for reference numbers and make sure to order the 284mm disc. I'm not sure which stores in the US have those but maybe you'll get lucky. Personally I'm trying to find the rear calipers so I can make that upgrade as well!
     

    Street Build 3K  9

    1997 Eagle Talon TSi AWD
    14.769 @ 92.22 · 2G DSM
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  5. PlanZero

    PlanZero Proven Member

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    Joined Aug 13, 2013
    Easton, Pennsylvania
    From all the research I've done the vented rears were only used briefly because they throw off the brake bias. I can't remember the reasons but when I upgraded my single piston fronts to dual piston gsx calipers I was going to get the 94/95 rears but that combo apparently sucks ass. At the time the rears could be found on rock auto for about $20/caliper.
    Edit: I just realized Wes393 says the same thing in his thread, yet it's funny how many people responded with plans to do the swap.

    I would ditch the vented rears; sell them to someone who wants to try em. Get the regular single pistons for the rears. Calipers can be found from $20-40 and rotors $10-20 on rock auto.
     
    Last edited: Aug 26, 2018

    Street Build 4K  8

    1996 Eagle Talon TSi
    fwd · automatic · 2G DSM

    Street Build 2K  0

    1997 Eagle Talon TSi AWD
    automatic · 2G DSM
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  6. Kryndon

    Kryndon Proven Member

    334
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    Bulgaria, Europe
    Technically yes, it would definitely f*** up the brake bias. On most cars it's about 70-75% front brake and 25-30% rear bias. On an early stock '95 2G, you'll end up having a bigger disk in the rear (284mm) and a smaller disk up front (276mm).

    However, this upgrade would be very good if you've already upgraded front brakes to either 3kGT 4 pot calipers or Brembos. Pair that with a brake master cylinder from a 3G, and you'll have all the stopping power you'll ever need for daily use and the occasional drag run or maybe even autocross.
     

    Street Build 3K  9

    1997 Eagle Talon TSi AWD
    14.769 @ 92.22 · 2G DSM
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  7. 95REGF150

    95REGF150 Proven Member

    166
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    Joined Mar 7, 2012
    Elk Grove, California
    Just because the rotor is slightly bigger than the front doesn't mean that you have more braking force than the front. The pistons on the rear caliper with the early 95 rear brakes are still much smaller in area than the dual piston GSX front calipers. So for the same brake pressure the clamping force is significantly higher on the front as it should be.

    If the bias was shifted so far off that it made the car swap ends on lock up then that is a significant safety risk. There would have been a recall for these and they would not make replacement parts.

    I have the early 95 rear brakes on my car and would never downgrade to the standard non vented setup. I have no problem with the bias either. With dual piston front calipers it still locks up the front before the rear.

    I believe that they went to the solid rear rotors as a cost saving measure. Even though the smaller non vented rotors are only cents less in cost to them over the vented ones, that is quite a bit of money multiplied by thousands of cars. And I think they deemed them not necessary.

    The reason I keep them is that for racing, the heat capacity of the vented rotor is far in excess of the solid rotor. Due to their low production numbers though it can be difficult finding replacement rotors though.

    Pads and calipers are pretty easy to come by as they are the same as the second generation 3000gt VR4 rear calipers.

    So to anyone with the early 95 rear brakes its up to you to make a decision to keep them based on these availability problems. But why downgrade your rear brakes when you don't have too?
     

    Street Build 2K  0

    1995 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  8. Michael Helsel

    Michael Helsel Probationary Member

    24
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    Joined Dec 26, 2015
    Youngsville, North Carolina
    I've been looking around for some rotors for a little while now. I suppose this means I'll have to look a little harder? I've seen some information about 4G rear rotors working and other information about certain years of VR4 rear rotors working, but I haven't been able to verify through my searching.
     

    Street Build 731  1

    1997 Mitsubishi Eclipse Spyder GST
    awd · manual · 2G DSM
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  9. fredom dsm

    fredom dsm Proven Member

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    Joined Jan 31, 2006
    Denton, Texas
    I found this on Amazon, would they work? Are this the Ones mentioned in thread #2?
     

    Street Build 1K  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    504  0

    1997 Mitsubishi Eclipse Spyder GST
    manual · 2G DSM
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  10. fredom dsm

    fredom dsm Proven Member

    234
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    Joined Jan 31, 2006
    Denton, Texas
  11. 95REGF150

    95REGF150 Proven Member

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    Elk Grove, California
    The VR4 rotors are the right diameter and thickness but not the proper offset. Same for the 4G. Unfortunately the vented rear rotors for the eclipse that work with the original brackets and calipers are a one off.

    You have to look harder but your can find them. If you don't mind standard non drilled or slotted rotors then rock auto has them for $24.79 a piece. Look halfway down the page Centric 121.46068 are the right ones.

    https://www.rockauto.com/en/catalog...ocharged,1103195,brake+&+wheel+hub,rotor,1896

    If you want drilled and slotted you will have to look much harder or send a couple of the plain ones out to be done.
     

    Street Build 2K  0

    1995 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  12. 95REGF150

    95REGF150 Proven Member

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    Joined Mar 7, 2012
    Elk Grove, California
    That kit will be solid rear rotors. If you notice it says 1995-up Talon AWD and 1994-up Talon FWD even though its a 2G kit. The vented rear rotors only came on AWD cars produced from 1/94 - 10/94. So any of the kits you find out there will not have them.
     

    Street Build 2K  0

    1995 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  13. fredom dsm

    fredom dsm Proven Member

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    Joined Jan 31, 2006
    Denton, Texas
    Aaah I see. Danm. It would work perfect for my set up as I already have the 3k front brakes.
     

    Street Build 1K  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    504  0

    1997 Mitsubishi Eclipse Spyder GST
    manual · 2G DSM
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  14. Kryndon

    Kryndon Proven Member

    334
    143
    Joined Jan 10, 2014
    Bulgaria, Europe
    Saw this come up, I remember posting about it. I ended up finding rear calipers from a 1997-2003 Galant VR-4, which use the 284mm vented disc. I bought new vented 284mm discs using part numbers for the Galant along with the taller pads, and everything was a complete bolt on. I know you guys don't have the VR-4 8th gen over in the States, but I believe the 3000GT rear discs on the turbo models are the exact same. Otherwise if anyone from Europe is looking, get the VR-4 rear calipers and discs! (check my profile for pics).
     

    Street Build 3K  9

    1997 Eagle Talon TSi AWD
    14.769 @ 92.22 · 2G DSM
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  15. rEclipserGST

    rEclipserGST Proven Member

    1,565
    49
    Joined Nov 17, 2007
    Columbus, Ohio
    What are you looking for again? I got my rotors and pads from Oreillys. I believe I MIGHT have some extra calipers for the rear. Pulled off a yard dog years ago. They will be in my storage unit. PM me if interested.
     

    Street Build 642  25

    1995 Eagle Talon TSi AWD
    187 whp · 200 lb/ft · 2G DSM
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  16. Michael Helsel

    Michael Helsel Probationary Member

    24
    5
    Joined Dec 26, 2015
    Youngsville, North Carolina
    I was after those too, but there's only one left! I might have to try going to an auto parts store to see what they can do .
     

    Street Build 731  1

    1997 Mitsubishi Eclipse Spyder GST
    awd · manual · 2G DSM
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