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2011 GT500 91 octane limited.......help get me the most rwhp

Discussion in 'SVT Shelby GT500' started by Neil1b, Nov 5, 2018.

  1. Neil1b

    Neil1b New Member Established Member

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    Location:
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    Hello all from AZ


    I got a 2011 GT500

    Current mods:

    127mm JLT
    2.6 pulley stock blower
    Roush axle back
    VMP twin 67 TB
    VmP mail order tune

    I do not want to run an octane booster nor can i do e85 as there are only a few aroung here.

    What mods/blower upgrades do you all suggest and what is a realistic number i can get on 91 octane?

    Thanks for you insight

    Neil
     
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  2. Willie

    Willie Active Member Established Member

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    Budget?
    Goals?
    Do you race? What kind?
    Where are you?
     
  3. red3v

    red3v Well-Known Member Established Member

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    Gen 2 VMP TVS, 2.6 upper. 2" headers 3.5" x-pipe. CJ mono blade, 8+ heat range plugs, Injectors. That's what I would do on 91 for best results IMO. There are cheaper routes but you won't make as much power.
     
  4. COOL COBRA

    COOL COBRA Hell Yes! Premium Member Established Member

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    Or change your mind & buy a case of Torco.
     
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  5. Klaus

    Klaus Well-Known Member Established Member

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    port that blower, smaller pulley, TB, headers. cams if you have the money.
     
  6. 96gt02

    96gt02 Active Member Established Member

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    Depends on your budget but if it unlimited you can probably get to around 700 RWHP on 91, you just need a really efficient blower and exhaust setup with all the supporting mods
     
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  7. Neil1b

    Neil1b New Member Established Member

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    Location:
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    UPDATE********NEED HELP!!

    picking up a tvs 2.3 from a 13-14 to put on my 2011.

    Question.........with only a 91 octane VMP tune what pully can i get?

    2.4 or 2.5?

    Mind you i have the 56# injectors and do not have a boost a pump.

    Called sales two diff times and got 2 diff answers.

    Also what belt can i run if i have the metco 90mm idler? Can i use my stock 2011 belt still?


    Thanks in advance
     
  8. Klaus

    Klaus Well-Known Member Established Member

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    2.4 w/ headers 2.5 w/o
     
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  9. Neil1b

    Neil1b New Member Established Member

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    Ok,

    What if headers are in the plans for 2-3 months out?


    2.5 now and 2.4 with headers?

    Too dangerous for 2.4 right now?

    Thanks Klaus
     
  10. 96gt02

    96gt02 Active Member Established Member

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    If you dont have a boost a pump your not going to be able to do anything other then a stock trinity pulley (2.67) safely, You might be able to get away with a 2.5 but why risk going lean and blowing your motor for what $400 worth of parts. and if you planning on running a 2.4 you will most likely need larger injectors as it can get sketchy higher rpm with the 13/14s on a 2.4 (without headers) and no doubt you'll need a booster. And as far as the belt, as long as your stock 11 one is in good shape you should be fine with just the 90mm idler for anything 2.5 and up. For a 2.4 Id personally get a 13/14 belt just so its a little more snug since a 2.4 is not a whole lot of pulley to grab.
     
    Last edited: Nov 8, 2018
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  11. merkyworks

    merkyworks Active Member Established Member

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    Without headers a 2.4 pulley will have to much exhaust back pressure. You will want to get a retune when you do LT's anyway so just run the 2.5 pulley/tune for now then when your ready for LT's put the 2.4 pulley on and get that combo tuned. Or just wait 2-3 months and install it all at once.
     
  12. HillbillyHotRod

    HillbillyHotRod Hooligan rabble rouser Established Member

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    With that larger injectors and a bap for safety. You can run a 2.4 without headers. I do.
     
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  13. Sielmo

    Sielmo Active Member Established Member

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    I was running a TVS with a 2.4" pulley and 52lb injectors. I was a tad lean above 5500rpm therefore, switched to ID1000. No BAPs and well within the margins and generating 660whp. When I went the cam route and was pushing above 750whp, then BAPS were required. All that said, I have the 5.4L motor so I don't know if there is a different recommendation for the 5.8L folks.
     
    96gt02 likes this.
  14. VNMOUS1

    VNMOUS1 Well-Known Member Established Member

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  15. Neil1b

    Neil1b New Member Established Member

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    Yep......did just that.


    Said 2.4 or 2.5 will both be ok, booster pump is just for added insurance



    Thanks everyone
     
  16. 1Kona_Venom

    1Kona_Venom A&P Mechanic Premium Member Established Member

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    you gonna get the Booster Pump?
     
  17. Neil1b

    Neil1b New Member Established Member

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    I will as soon as i can. Hoping to come across a used one here for sale. If not, ill get one in the next month or so
     
  18. medeiros

    medeiros New Member

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    Location:
    Canada
    I have a 2.4 and a trinity and my boost is at 19Ibs no headers. so I believe it would be wise for the headers. Getting headers this spring.

    Sent from my SM-G955W using the svtperformance.com mobile app
     
  19. Neil1b

    Neil1b New Member Established Member

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    Are you on 91?

    I have headers on the list......already have kooks green catted pipes nib in the garage(deal on ebay).

    Any advise running the 2.4 and booster on 91 until i get the headers?
     
    Last edited: Nov 10, 2018

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