Heads from 2.8l natural aspirated on RS4?

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Topic: Heads from 2.8l natural aspirated on RS4? (Read 20438 times)

s5fourdoor

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	Re: Heads from 2.8l natural aspirated on RS4? « Reply #15 on: April 03, 2013, 10:39:36 AM »

ok, let me ask another more finite question.

2.7t runs 23 psi from 4500-7000. what's your guess on how much i'd see from:

2.8 n/a heads with 2.8 cams
rs4 intake manifold
rs4 / w8 tb
everything port matched

versus

2.7t heads 2.7t cams
2.7t intake manifold
2.7t tb

i'm trying to weigh doing the 2.8 head upgrade when i do my next timing belt or waiting until i build a motor.

are we talking 5hp? or are we talking 35hp?
it will be tuned correctly (timing / fuel / etc).


« Last Edit: April 03, 2013, 10:41:12 AM by nehalem »	Logged

prj

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	Re: Heads from 2.8l natural aspirated on RS4? « Reply #16 on: April 03, 2013, 10:42:39 AM »

Waste of time IMO.


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s5fourdoor

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	Re: Heads from 2.8l natural aspirated on RS4? « Reply #17 on: April 03, 2013, 10:46:07 AM »

Quote from: prj on April 03, 2013, 10:42:39 AM

Waste of time IMO.

perfect answer. thank you!


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CoupedUp

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	Re: Heads from 2.8l natural aspirated on RS4? « Reply #18 on: April 06, 2013, 09:58:03 AM »

http://www.audizine.com/forum/showthread.php/279637-TiAL-R650-Kit-Big-Ports-615whp-545wtq-Small-Ports-580whp-550wtq?highlight=2.8+cams

Looks like you're standing to gain ~35 HP. Not even close to worth IMO. Response and torque are pretty much spot on with each other.


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prj

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	Re: Heads from 2.8l natural aspirated on RS4? « Reply #19 on: April 06, 2013, 11:42:34 AM »

Quote from: CoupedUp on April 06, 2013, 09:58:03 AM

You are taking things way out of context.
1. In that post RS4 heads are used, not 2.8 ones. This is not the same thing.
2. The car is running over 600whp. This is not something the OP is running. Much better to say that there was 5% difference.


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s5fourdoor

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	Re: Heads from 2.8l natural aspirated on RS4? « Reply #20 on: April 06, 2013, 11:46:28 AM »

prj, my original point was that, if you do a top end rebuild.. at least where i live, its absolutely cheaper to find a 50-60k set of V6 heads and just swap them on there in their entirety...

its very clear that "wasting money" on this isn't worth it, but there could be other reasons why somebody is fixing the cylinder head... in which case it might be worth it since the N/A parts are that much cheaper even with low miles...

esp if you get low mileage cam tensioners and lifters, in addition to the big ports, along with the repair...


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theaznal

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	Re: Heads from 2.8l natural aspirated on RS4? « Reply #21 on: August 16, 2013, 08:44:49 AM »

Quote from: ddillenger on April 01, 2013, 12:16:43 AM

No, it's not. It's a bad idea all around on a k04 car.

Please elaborate as Im planning a set of 2.8 heads for my B5 S4 (N/A intake, S4 exhaust) in a few months.

Thanks,
Adrian
02 S4


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