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  1. #1
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    Single Turbo 18 Psi HPPF limit

    So it seems that I have discovered the limits of a single turbo setup with an e50 mix. This is at 18 PSI as you can see the HPFP takes a crap up top. Next step is to lower the e85 mix and see if that helps out at all. Any other suggestions are welcome. But be advised I am trying to avoid running meth at this point.

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    Vargas upgraded HPFP and rail, consider putting a 255 inline with your 450 in tank. Click here to enlarge
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    Low pressure is fine so nothing on that side of the system is going to help. It's just a high pressure limit. You could try the vargas stuff to see if it helps.

    Your other options are to lean the mixture out (e.g. 12.75:1 up top) and/or reduce E85 mix.
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    Low pressure is fine so nothing on that side of the system is going to help. It's just a high pressure limit. You could try the vargas stuff to see if it helps.

    Your other options are to lean the mixture out (e.g. 12.75:1 up top) and/or reduce E85 mix.
    right, im just suggesting the inline for when he hits the next barrier as he again raises boost lol
    - Proven Power Tampa built 6466 ST -
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    It would only be a factor if average low fuel pressure went below 55-60psi. I doubt it will with any upgrade in place.
    Burger Motorsports
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    It would only be a factor if average low fuel pressure went below 55-60psi. I doubt it will with any upgrade in place.
    i think we are misunderstanding each other lol... its not a factor now, but when if he goes to 25psi plus.. then we will see. I tried the 450 by itself and it didnt keep up that well at high boost. I went back to the 255 inline (as you know) and my low pressure has been great even with up to E50 at 25-27psi. im just saying its worth a shot later when he really turns it up if his low pressure starts to slip Click here to enlarge
    - Proven Power Tampa built 6466 ST -
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    Click here to enlarge Originally Posted by Ak335i Click here to enlarge
    i think we are misunderstanding each other lol... its not a factor now, but when if he goes to 25psi plus.. then we will see. I tried the 450 by itself and it didnt keep up that well at high boost. I went back to the 255 inline (as you know) and my low pressure has been great even with up to E50 at 25-27psi. im just saying its worth a shot later when he really turns it up if his low pressure starts to slip Click here to enlarge
    This seems to happen tho past 6800+ rpms, which your auto does not do right?

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    The 455 alone flows very well when installed right. But a 455 with a bad install of course could flow less than stock. If your low pressure was not keeping up at 600rw with a 455 then something was just wrong with it. Not that it matters much as the 255 is cheaper and easier to install. I've become a fan of it lately. Click here to enlarge
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    The 455 alone flows very well when installed right. But a 455 with a bad install of course could flow less than stock. If your low pressure was not keeping up at 600rw with a 455 then something was just wrong with it. Not that it matters much as the 255 is cheaper and easier to install. I've become a fan of it lately. Click here to enlarge
    I think my LPFP is fine right now.

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    3 out of 4 members liked this post. Yes Reputation No
    12:1 is pretty rich for E85. Lean it out. Click here to enlarge
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    Click here to enlarge Originally Posted by aflatau Click here to enlarge
    This seems to happen tho past 6800+ rpms, which your auto does not do right?
    youre down to 10psi at just over 4000rpm and take a huge hit by 6300rpm
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    Click here to enlarge Originally Posted by Ak335i Click here to enlarge
    Vargas upgraded HPFP and rail, consider putting a 255 inline with your 450 in tank. Click here to enlarge
    Seems this would be where to look.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

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    you can run pump gas 93 at 18psi with 6466 turbo

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    12:1 is pretty rich for E85. Lean it out. Click here to enlarge
    Who would neg rep this?

    Fuel ........................ AFRst ........ FARst ....... Equivalence Ratio ... Lambda
    Gas stoich ................ 14.7 .......... 0.068 ................ 1 ................... 1
    Gas max power rich .... 12.5 .......... 0.08 ................. 1.176 .............. 0.8503
    Gas max power lean .... 13.23 ........ 0.0755 .............. 1.111 ............. 0.900
    E85 stoich .................. 9.765 ....... 0.10235 ............ 1 ................... 1
    E85 max power rich ...... 6.975 ....... 0.1434 .............. 1.40 ............... 0.7143
    E85 max power lean ..... 8.4687 ...... 0.118 ............... 1.153 .............. 0.8673
    E100 stoich ................ 9.0078 ...... 0.111 ............... 1 .................... 1
    E100 max power rich .... 6.429 ........ 0.155 .............. 1.4 .................. 0.714
    E100 max power lean .... 7.8 .... ...... 0.128 .............. 1.15 ................ 0.870
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


  15. #15
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    Click here to enlarge Originally Posted by 135idct Click here to enlarge
    you can run pump gas 93 at 18psi with 6466 turbo
    yea that should be doable with a stock fuel system.
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    Who would neg rep this?
    Can't please everyone. 2/3 isn't bad. Click here to enlarge In a perfect world 12:1 is fine. But in a world where you're limited on fueling capacity, 12.5:1 will allow more power with minimal safety trade off. Some guys run it as lean as 13:1 although I would not suggest it.

    I added some notes on JB4 single turbo boost control for those who plan to run a similar setup: http://www.n54tech.com/forums/showthread.php?t=20406
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    Who would neg rep this?

    Fuel ........................ AFRst ........ FARst ....... Equivalence Ratio ... Lambda
    Gas stoich ................ 14.7 .......... 0.068 ................ 1 ................... 1
    Gas max power rich .... 12.5 .......... 0.08 ................. 1.176 .............. 0.8503
    Gas max power lean .... 13.23 ........ 0.0755 .............. 1.111 ............. 0.900
    E85 stoich .................. 9.765 ....... 0.10235 ............ 1 ................... 1
    E85 max power rich ...... 6.975 ....... 0.1434 .............. 1.40 ............... 0.7143
    E85 max power lean ..... 8.4687 ...... 0.118 ............... 1.153 .............. 0.8673
    E100 stoich ................ 9.0078 ...... 0.111 ............... 1 .................... 1
    E100 max power rich .... 6.429 ........ 0.155 .............. 1.4 .................. 0.714
    E100 max power lean .... 7.8 .... ...... 0.128 .............. 1.15 ................ 0.870
    Crap, that was my bad. I meant to pos rep but I clicked the wrong thumb. I'll pos rep Terry when I can.
    Click here to enlarge
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    Click here to enlarge Originally Posted by rader1 Click here to enlarge
    Crap, that was my bad. I meant to pos rep but I clicked the wrong thumb. I'll pos rep Terry when I can.
    Hahhahaha. I've done that before too
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    Can't please everyone. 2/3 isn't bad. Click here to enlarge In a perfect world 12:1 is fine. But in a world where you're limited on fueling capacity, 12.5:1 will allow more power with minimal safety trade off. Some guys run it as lean as 13:1 although I would not suggest it.

    I added some notes on JB4 single turbo boost control for those who plan to run a similar setup: http://www.n54tech.com/forums/showthread.php?t=20406
    Hey, I run 13:1 (E70) because you do according to some of your dynos! I should dial it back now?
    Change is constant

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    @ 450whp it's OK but a bit lean. @ 600rw I'd definitely richen it up.
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    i run 11.9-12.1 at my power level. seems legit Click here to enlarge
    - Proven Power Tampa built 6466 ST -
    - N54 6AT WR 711whp 637wtq-
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