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Intake manifolds
Plus there's the extra added bonus that the old butt dyno is notoriously unreliable mostly cause it doesn't sense acceleration, it senses change in acceleration.
So, an engine with a flat smooth torque curve will feel slow and an engine that dramatically "comes on the cam" will feel really fast once it hits the increase in the torque curve.
Another thing is engine power vs. driver input. An example here is the bigger throttle body, or in particular a Weber single plate throttle body, vs. the stock TB. Because those TB's allow more air flow for a given pedal movement, they feel faster since the engine has a greater response for given operator input. In reality they only supply an HP or two even on an extensively modified engine.
Dan
From: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
Sent: Tuesday, December 26, 2006 9:03 AM
Subject: Re: Intake manifolds
> Well, that is sure interesting, and anther downside of the Fox manifold is
> that it needs a bit of firewall clearancing to fit into a MkI. And I often
> wonder if the performance improvements are real or perceived for some mods,
> maybe I'm not typical, but mine never seem to happen in isolation, my car
> was sure faster when that Fox manifold went on, but the car also got a cam,
> more displacement, different gearing and so on at the same time.
> Interesting stuff!
> Cathy
>
> On 7:34 am 12/26/06 "Dan Bubb" <jdbubb@verizon.net> wrote:
>> Ran across an interesting thread.
>> http://rotorcharged.com/phpBB2/viewtopic.php?t=30
>>
>> with some data from this site:
>>
>> http://scientificrabbit.com/index.php?option=com_content&task=view&id=
>> 13&Itemid=1
>>
>> Apparently, the Fox manifold doesn't flow as well as a stock A1
>> manifold!
>>
>> Course it looks like none of the 8V manifolds flow very well.
>>
>> Another area for improvement for our poor disadvantaged 8V's.
>> Dan
>>
>>
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>
>