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IRS improvement suggestions

Discussion in 'Suspension Modifications' started by AnthonyRosas, Mar 20, 2017.

  1. AnthonyRosas

    AnthonyRosas Member Established Member

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    Location:
    Charlotte, NC
    Hey All

    i've got a ~500rwhp street termi with a stock IRS
    no huge plans to significantly increase HP - ported eaton - pulley and tune

    ive got a large list of other suspension mods in the works right now
    IRS is something i was to address

    Question is: the MM IRS rear grip package - the basics. im sure will be a solid mod for my car.
    but from a $$ perspective, what would be the nest level down from this mod for rear IRS?

    i assume it would just be poly bushing kits?
    i was considering just doing the MM Rear IRS urethane differential mount kit
    https://lmr.com/item/MM-MMIRSB45/99...rsports-Rear-Irs-Urethane-Differential-Mounts

    would this get me a decent improvement over stock?

    i honestly don't launch the car a ton - so im OK if its not super beef'd up.
    but its a toy car and i'm very "spirited" driver. lol

    suggestions/opinion are welcome!
     
  2. P49Y-CY

    P49Y-CY curiosity > faith Established Member

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    i would recommend full tilt boogie racing.

    i have found the fitment and quality of their parts to be superior to mm and others.

    best of luck with it
     
  3. joker21705

    joker21705 Active Member Established Member

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    Full tilt boogie kit

    Sent from my SM-G925V using Tapatalk
     
  4. UnrealSVT

    UnrealSVT Active Member Established Member

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  5. SROLD

    SROLD Member Established Member

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    Full Tilt Boogie is absolute best way to go. Had it on my 03 for over 8 years that i just sold. Very good parts and very good instructions for DIY. Have been to their facility in Wisc and they are a stand up company.
     
  6. AnthonyRosas

    AnthonyRosas Member Established Member

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  7. 2DXTRM

    2DXTRM Pushrod 5.0 Established Member

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    Best $600+ you'll ever spend.
     
  8. blownfox

    blownfox Well-Known Member Established Member

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    I did the FT 1350M and FT 5001, FT 1860, and found out my sway end links were bad so I ordered their FT 1900. It was probably over kill for my setup but I only wanted to take out the rear end once. I also upgraded rear sway bar and the car handles awesome.

    My previous car was a 93 cobra with full MM suspension (front/rear coil overs, sways bars, lower control arms, ect) and my 03 handles better (stock springs). I'm not knocking MM as their stuff is awesome and will probably order their coil over kit down the road. IMO you can't go wrong with FTBR or MM!

    Both companies provide excellent customer service and will not try to sell you something you don't need. I would call them and then make a decision on what you need. Just remember it's cheaper to do it right the first time.
     
    The Abyss likes this.
  9. jrichber

    jrichber browser Established Member

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    I am in the same boat at the moment. I currently have the car torn apart so I could put on a FRPP diff cover. I could not justify spending close to $200 on replacing just 3 bushings for a car that will hardly ever see the track. So I went with the same MM kit you show. Now if LMR does not get them in stock tomorrow like it says they are I will probably get tired of waiting and just spend the extra money to get the FTBR Front and rear differential ones. I figured you can pull the control arms without having to actually remove/drain the differential, so I can tackle those another time.
     
    AnthonyRosas likes this.
  10. AnthonyRosas

    AnthonyRosas Member Established Member

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    you ordered this one?
    https://lmr.com/item/MM-MMIRSB45/99...rsports-Rear-Irs-Urethane-Differential-Mounts

    it says that if i order today it will ship tomorrow

    so maybe yours will ship out then?
     
  11. jrichber

    jrichber browser Established Member

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    Yes, that is the one I ordered. Temp where I live is back down in the 30's this week with snow/rain for the next couple weeks now. So I am willing to wait another week or so but after that I will either cancel it and stay stock or go with the FTBR.
     
  12. KyleSVT

    KyleSVT Terminated Established Member

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    This! FTBR was the best money I have spent on my car to date.
     
    Last edited: Jul 30, 2017
    The Abyss likes this.
  13. jrgoffin

    jrgoffin Been around... Established Member

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    Here's a ton of info for you:

    http://www.terminator-cobra.com/suspension.htm

    Have had the MM/Prothane bushings in my IRS for years - still good as new. I don't drag race, but drive the heck out of the car (especially with the new engine), and the IRS stays nicely planted.
     
    NVRL8TE likes this.
  14. Black2010

    Black2010 Active Member Established Member

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    Location:
    Round Rock, TX
    I also have the MM/Prothane bushings. Did the whole car and it drives great. Zero regrets at this point.
     
  15. 1wild-horse

    1wild-horse Relax! I'm a Doctor! Established Member

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    Just sent off an order for the full FTBR kit. After having poly in the car since 08, it has been dragged, auto crossed and driven for about 25k miles and they are shot.
     
  16. AnthonyRosas

    AnthonyRosas Member Established Member

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    Location:
    Charlotte, NC
    Hey All
    so quick update...after i did some other significant suspension upgrades...i found that i dont REALLY need the IRS stuff

    mods that affected the rear were...H&R Race Springs - Bilstein Shocks - Eibach Sway bar...way less wheel hop. I was kinda surprised honestly
    its still there if i try in 1st gear....but hard 2nd -> 3rd gear pulls feel way more secure
     
  17. rrpederson

    rrpederson lookin 4 parts Established Member

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    texas
    I know you don't want to spend the money, but honestly man, if you have to, save for just a little while longer. The FTBR kit is absolutely worth every penny. Go to YouTube and search for Full Tilt boogey's demonstration videos. They completely eliminate every single problem that the factory IRS is plagued with. I'm sure you're like the rest of us and absolutely love your car. Believe me, the girl is worth it. You will be able to drive your car any kind of way you want without the risk of breaking something related to the IRS. That is peace of mind worth the extra coin.
     
  18. Jefe

    Jefe Well-Known Member Established Member

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    AIRASSAULT13F40 likes this.
  19. The Abyss

    The Abyss New Member Established Member

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    Full Tilt Boogie is the way to go! One of the best mods ever. Also if you're pulling the IRS out, it's a good time to do gears, seals, bearings etc!
     
    KyleSVT likes this.
  20. Dave.O

    Dave.O Member Established Member

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    Location:
    Houston
    go with solid aluminum diff bushings. no they do not transmit more noise and they will last forever. I have on both my cobras, one with coil overs and it is planted at high speeds
     

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