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  1. #1
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    VAC stage 1 or 3 cylinder head with n54 forged piston kit

    Was thinking of reinforcing some of the engine internals next since im on the quest for most powerful e93 in the world...Click here to enlarge I like the fact that VAC will do

    Complete Disassembly & Cleaning
    Comprehensive Leak, Crack & Pressure Test
    Inspect All Components For Irregular Wear
    Our High performance Multi Angle Valve Job using Serdi Equipment
    All New VAC Uprated Valve Guides
    Viton Valve Seals
    Reconditioning & Blueprinting of Your Valves
    Balancing of Your OE Springs
    Trueness Checked & Resurfaced Mating Surface
    Unshrouding of Valves
    Attention to Potential Hot-spot Areas and Chamfering

    and i thought i might as well add the forged pistons in as well

    anyone opposed to this or think its overkill?...I wanna make sure my engine is nice and clean and actually capable of handling the extra stress....

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    2 out of 2 members liked this post. Reputation: Yes | No
    the N54 has already forged pistons and very good internals. If you are going for the most power you need to lower the compression rate and get a single turbo setup.
    07 335i AT - MOTIV 750 - MHD BMS E85 - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
    Click here to enlarge

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    Click here to enlarge Originally Posted by enrita Click here to enlarge
    the N54 has already forged pistons and very good internals. If you are going for the most power you need to lower the compression rate and get a single turbo setup.

    you sure about that?

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    Click here to enlarge Originally Posted by enrita Click here to enlarge
    the N54 has already forged pistons and very good internals. If you are going for the most power you need to lower the compression rate and get a single turbo setup.
    i see they sell the pistons with 9.5:1 and 8.5:1 compression rates

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    http://www.bimmerboost.com/showthrea...Whats-Involved

    As usual, im way ahead of you Click here to enlarge ive decided that im going to lower the compression when its time to do this. to gain back the "lost" power, you only need to up the boost 1 psi, and we all know once fueling is solved, its gonna mu much more than that.

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    real question is gonna be whos gonna get it done first? Click here to enlarge
    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    http://www.bimmerboost.com/showthrea...Whats-Involved

    As usual, im way ahead of you Click here to enlarge ive decided that im going to lower the compression when its time to do this. to gain back the "lost" power, you only need to up the bosst 1 psi, and we all know once fueling is solved, its gonna mu much more than that.

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    lol. you. id only get there stg 1 heads though. call and ask for Steve, he gave me an estimate already, but i dont want to mis-quote them..

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    lol. you. id only get there stg 1 heads though. call and ask for Steve, he gave me an estimate already, but i dont want to mis-quote them..
    lol...i really wanna see what those ported heads do on enritas car as well before i even attempt tho

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    yea, i was thinking the same thing as well. I think im just going to wait until i get my hands on the upgraded inlet pipes, if the motor has to come out for that anyway, might as well make it worthwile, pull it once, rebuild, Upgraded fuel system, back in, JB4 PRO, destroy all in its path..

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    The biggest thing with the inlet pipes is the back one..it is a slim pipe between the engine and firewall..almost no room to upgrade it...the front one however can benefit from a bit of a better sized pipe..

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    Click here to enlarge Originally Posted by enrita Click here to enlarge
    the N54 has already forged pistons and very good internals. If you are going for the most power you need to lower the compression rate and get a single turbo setup.
    I wish but you're actually off on that one...crankshaft is forged but the pistons and rods are cast...

    by the way, when're you gonna dyno that beast?

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    I would love to see before/after dynos of the heads all else equal to see what kind of power gains are there. While the heads are off it's normally easy to take a few CC out and lower your compression at the same time. I'd shoot for 9.5:1 on a street setup. Makes the motor much more forgiving to tuning and easier to keep in one piece. With only a minor peak power drawback.

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    I would love to see before/after dynos of the heads all else equal to see what kind of power gains are there. While the heads are off it's normally easy to take a few CC out and lower your compression at the same time. I'd shoot for 9.5:1 on a street setup. Makes the motor much more forgiving to tuning and easier to keep in one piece. With only a minor peak power drawback.
    ..drawback that can be too easily compensated for in a safe way Click here to enlarge

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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    ..drawback that can be too easily compensated for in a safe way Click here to enlarge
    indeed. Im leaving my engine at 9:1...gonna have fun reeling you guys in with some old school stuff Click here to enlarge

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    Click here to enlarge Originally Posted by Matt@Camber-Toe Click here to enlarge
    The biggest thing with the inlet pipes is the back one..it is a slim pipe between the engine and firewall..almost no room to upgrade it...the front one however can benefit from a bit of a better sized pipe..
    yes, but noone is saying it MUST to follow the stock path.. hmm hhmm hmm..

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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    I would love to see before/after dynos of the heads all else equal to see what kind of power gains are there. While the heads are off it's normally easy to take a few CC out and lower your compression at the same time. I'd shoot for 9.5:1 on a street setup. Makes the motor much more forgiving to tuning and easier to keep in one piece. With only a minor peak power drawback.

    what peak power drawback would u be speaking of....could you elaborate? Click here to enlarge

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    Click here to enlarge Originally Posted by ultimateendz Click here to enlarge
    what peak power drawback would u be speaking of....could you elaborate? Click here to enlarge
    Less static compression = less effective compression = less power potential. But easier safer tuning. The power drop manifests itself most noticeably in lower RPM off boost conditions but you're also giving up some peak power potential all else being equal. Normally, you just oversize the compressor and run more boost to make up for it. I'd definitely drop down to 9.2-9.5 if possible. I doubt there will be much off boost drawback noticeable and the tuning benefits are undeniable if you have big enough compressors to make up for it.

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    pm me your email, ill send you the estimate i recieved just dont quote it as your own or accurate, as VAC holds the right to change prices ect..

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    pm me your email, ill send you the estimate i recieved just dont quote it as your own or accurate, as VAC holds the right to change prices ect..
    yessir

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    yes, but noone is saying it MUST to follow the stock path.. hmm hhmm hmm..
    That's what I was thinking... I'll send you a pm about something

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    done and done Click here to enlarge

    Dan get that thing built! Ill enjoy being out of the spotlight for a while Click here to enlarge

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    done and done Click here to enlarge

    Dan get that thing built! Ill enjoy being out of the spotlight for a while Click here to enlarge
    Click here to enlarge

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    BTW Dan, good reading in here to give you an idea:

    http://www.bimmerboost.com/showthrea...atio-Boost-101

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    BTW Dan, good reading in here to give you an idea:

    http://www.bimmerboost.com/showthrea...atio-Boost-101
    ok...so from what i gather from that read is that the compression we currently have (10.2:1) allows us the most peak power because of its natural compression but is more volitile because the air/fuel is compressed so much, but if we changed to a lower compression we would lose some of that peak power at the same psi because the internal pressure is not a much but that can be offset by increasing the psi. (am i in the ballpark with that one?)

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    ^yes no?

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