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Thread: 471WHP/469WTQ - COBB/JB4 on Pump 94 Gas

              
  1. #26
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    regrind the stockers? should be a few companies out there capable of designing a better profile. speaking of which, what are lift and duration specs of the stockers?

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    I know very little to nothing about modifying internals..
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    Your wasting your timie/money with headwork/cams, your top end limit is caused by the stock turbo housing limitations, not motor "flow"

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    How do you know that for sure?
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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
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    How do you know that for sure?
    Good question and contradictory to headwork numbers posted by PAW.

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    Click here to enlarge Originally Posted by Laloosh Click here to enlarge
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    Your wasting your timie/money with headwork/cams, your top end limit is caused by the stock turbo housing limitations, not motor "flow"
    I suspect you are correct. any pics of the turbine from the rear?

    I'd still be interested to hear what a 'cam expert' had to say.

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    Not that heads/cams are worthless, but I'd agree the gains may not be worth the amount vested to some.

    Certainly bigger turbos will make bigger power without opening up the engine, but typically there is an expense in drivability and there definitely will be a massive expense in purchasing and installing.

    If cams/heads are upgraded with modified stock housing turbos I do believe the gains would be worthwhile, but will not be anything overwhelming.

    All of that aside, I am not sure I am aware that the "modified turbo housing" limitations have been found... did I miss that?

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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
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    How do you know that for sure?
    Because I have experience with this o. My old car. Take a gt35 and now change the a/r and you still have a gt35 however it makes drastically different power.

    You flow up top will be limited by the area and radius of the housing. Being that they are slightly bigger then stock its simply common sense to look there before spending 10k on head and cam work. But that's just my opinion. Think it through. Read up on how a/r's affect turbo and then report back.Click here to enlarge

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    Click here to enlarge Originally Posted by Rob@RBTurbo Click here to enlarge
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    Not that heads/cams are worthless, but I'd agree the gains may not be worth the amount vested to some.

    Certainly bigger turbos will make bigger power without opening up the engine, but typically there is an expense in drivability and there definitely will be a massive expense in purchasing and installing.

    If cams/heads are upgraded with modified stock housing turbos I do believe the gains would be worthwhile, but will not be anything overwhelming.

    All of that aside, I am not sure I am aware that the "modified turbo housing" limitations have been found... did I miss that?
    That's what I think as well...on my car I still haven't had a chance to flatten boost up top and see what sort of torque curve I'm getting...but that's coming, just requires 12ohm resistors on the jb4 to "try" LOL Click here to enlarge I'm flying off to Mexico, in all seriousness Click here to enlarge, this Friday for a week so all car fun is going on standby for a "FULL" week lol
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    great #'s for pumpgas only. Curious to see the numbers when you go back on meth. Wish someone locally would go with a setup like yours on a n54

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    Click here to enlarge Originally Posted by talontsi97 Click here to enlarge
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    ...Wish someone locally would go with a setup like yours on a n54
    lol wawawawawuuuuuut...?

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    Click here to enlarge Originally Posted by black bnr32 Click here to enlarge
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    I suspect you are correct. any pics of the turbine from the rear?

    I'd still be interested to hear what a 'cam expert' had to say.
    One should only modify a part (esp the difficult and expensive ones) if you have a good grasp of it's contribution to the whole engine airflow regime before and after the mod/change. With the N54 no one has publically released what the stock cam specs are, exactly how much Vanos moves their events and under what conditions (cam movement map). Until you know this and can control it, it's pointless to start adjusting cam specs.

    Also, since the n54 is speed density and tightly controlled by the dme, adjusting the cams could really throw the dme into chaos and cause a lot of problems which would take some serious tuning adjustments to sort out. Without a spare terry or shiv at your disposal, it could be a journey to fix it.

    I'm with Rob in saying wait to see what turbos like his can do at 20-25psi with a fueling fix before you starting thinking about cams and headwork. They probably will top out at 550+whp which is nuts and the next step up to the 700+whp club will be HPF price levels.

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    I would love to have 550whp with the stock N54 torque and power curve. A big single will completely change the power delivery of this motor, not 100% sure I would be interested in that.
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    Click here to enlarge Originally Posted by Irishace Click here to enlarge
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    I would love to have 550whp with the stock N54 torque and power curve. A big single will completely change the power delivery of this motor, not 100% sure I would be interested in that.
    A big single will shift the curve but the heads still don't flow all that well up top and the cam profile is not designed with a big single in mind or top end power.

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