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Thread: How much boost?

  1. #1
    2,000 rpm - light wheelspin, no bog here! cbaylis77's Avatar
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    How much boost?

    Just found out my turbo car came with a blown motor so I'm starting fresh. How much boost can a stock bottom end take?
    Miata family: '93 auto "Blacky", '99 turbo "Frankenstein" and '05 Mazdaspeed.

  2. #2
    3,000 rpm - starting to feel the power RyanxStorey's Avatar
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    I've read 250 rwhp but seen others post 250 wheel torque.
    1993 Electronic Pearl Blue - 1.6, T25 SR20 turbo on 14psi with custom stainless steel tubular manifold, 3 inch stainless steel downpipe, RX7 460 injectors, DiYPNP MS2, MTX-L wideband.
    Storey's turbo NA

  3. #3
    4,000 rpm - entering the fun zone concealer404's Avatar
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    250wtq is the "accepted" number.
    Quote Originally Posted by Jeremy Clarkson
    One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.

  4. #4
    2,000 rpm - light wheelspin, no bog here! adamvanxxx's Avatar
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    All of it

  5. #5
    2,000 rpm - light wheelspin, no bog here!
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    Quote Originally Posted by adamvanxxx View Post
    All of it
    came in here to post this

  6. #6
    4,000 rpm - entering the fun zone concealer404's Avatar
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    That's usually what i answer when someone asks me how much i run... but my brain hurts so i didn't post it.

    Can i still get partial credit?
    Quote Originally Posted by Jeremy Clarkson
    One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.

  7. #7
    2,000 rpm - light wheelspin, no bog here! cbaylis77's Avatar
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    Thanks guys. I've heard 250 as well. It did 280 at 16lbs before it came apart. My goal is 300 and I have better rods and pistons for it. Just hoping the crank holds up!
    Miata family: '93 auto "Blacky", '99 turbo "Frankenstein" and '05 Mazdaspeed.

  8. #8
    4,000 rpm - entering the fun zone concealer404's Avatar
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    The crank will be fine to 500whp+
    Quote Originally Posted by Jeremy Clarkson
    One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.

  9. #9
    2,000 rpm - light wheelspin, no bog here! adamvanxxx's Avatar
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    Yea I have never heard of a crank OR block failing.

    It is just the pistons and rods. It was probably just your tune, plenty people are chillen in that range on stock internals.

    If you haven't already, http://miataturbo.net

  10. #10
    2,000 rpm - light wheelspin, no bog here! cjsafski's Avatar
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    Quote Originally Posted by adamvanxxx View Post
    All of it

    Damnit I got beat to it too.

    What turbo and what are you using for fuel management? There may be some underlying flaw with the setup.
    1996 Montego Blue: Homebrew M62 Supercharger, MS2, rx7 460's, Tein Flex 9/6, 15x8 6ULs
    http://mazdaroadster.net/showthread....upercharged-NA
    1993 Volvo 940: b230ft with 16v, MS2, 57 Trim T3/T4, Yoshifab Intake Manifold, Ebay Intercooler , 3" Exhaust, Cut Springs

  11. #11
    2,000 rpm - light wheelspin, no bog here! cbaylis77's Avatar
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    It's a Turbonetics 60 series and Hydra 2.5 EMS. It has RX-7 injectors (460 I think) so they I will need to be upgraded. I think it was a poor engine rebuild by the previous owner. I'm owner number four so there are alot of questions I'm sorting out. The Hydra 2.7 would be nice too but one thing at a time.
    Miata family: '93 auto "Blacky", '99 turbo "Frankenstein" and '05 Mazdaspeed.

  12. #12
    4,000 rpm - entering the fun zone concealer404's Avatar
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    Are you tuning it yourself or do you have a tuner in the area familiar with Hydra? If you answered "No" to both of those questions, get rid of Hydra.
    Quote Originally Posted by Jeremy Clarkson
    One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.

  13. #13
    2,000 rpm - light wheelspin, no bog here! adamvanxxx's Avatar
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    Hydra seems to suck....


    At least I understand MS

  14. #14
    2,000 rpm - light wheelspin, no bog here! cbaylis77's Avatar
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    Never used Hydra or Mega Squirt myself so I'm not familiar with either yet. I do have a local tuning shop to work on it after I get it running again. The guys at Flyin' Miata have also been a big help so far.
    Miata family: '93 auto "Blacky", '99 turbo "Frankenstein" and '05 Mazdaspeed.

  15. #15
    4,000 rpm - entering the fun zone concealer404's Avatar
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    Quote Originally Posted by cbaylis77 View Post
    Never used Hydra or Mega Squirt myself so I'm not familiar with either yet. I do have a local tuning shop to work on it after I get it running again. The guys at Flyin' Miata have also been a big help so far.
    Has the local shop spent some time with Hydra before?
    Quote Originally Posted by Jeremy Clarkson
    One thing I’ve noticed over the years is that if you drive into London at 6am, half of the cars on the roads are Porsches and Astons. Whereas if you go in at ten to nine, they’re all Renaults. Simple solution, then. You want a nice car? Get up earlier and do more work.

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