[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Breathing air box....
the address is in the link of the signature below...
Daun: I am on my waym see you tomorow, will call your cell # when I cross
the border.
___ ___________
/ |/_ __/ ___/ A Texan's Scirocco 1985 8v
/ /| | / / \__ \ http://www.longcoeur.com/scirocco
/ ___ |/ / ___/ / (AIM) patricdlc, (ICQ) 32918816
/_/ |_/_/ /____/
----Original Message Follows----
From: Jeremy Salda <roccoguy@mac.com>
To: "Dan Bubb" <jdbubb@ix.netcom.com>
CC: scirocco-l@scirocco.org
Subject: Re: thoughts on breathing - long
Date: Fri, 30 Nov 2001 12:23:21 -0600
kudos on the swiss-cheese airbox info. i've heard of everyone doing
that, but when i've sat and thought about it, the same thing came to
mind, you're going to putting hot air into the engine, not good, unless
you want to put an intercooler between the box and TB. what's the
address for patrick's site so that i can see his mod?
jeremy
On Friday, November 30, 2001, at 09:54 , Dan Bubb wrote:
>I read an interesting article about the Audi R8 direct injection V8
>recently
>in Race Tech magazine. Although the Direct injection engine had up to 35
>ft-lbs more torque than it's predecesor the drivers all thought the
>engine
>had less performance because the power came in sooner so there was less
>of a
>hump to the torque curve.
>The lesson here is that making changes to your engine will make it FEEL
>faster or slower, but this doesn't necessarily correlate to whether the
>engine is ACTUALLY faster or slower. The butt dyno is a liar. You have
>to
>actually measure to know whether your change was effective or not.
>Having said that, installing the larger TB will increase power somewhat
>if
>done properly by porting the manifold to match it. But, it should
>really be
>one of the last things you do to your engine since it will make little
>difference until you've done all the other stuff i.e. exhaust, cam, P &
>P,
>blah, blah. Just installing the TB with no other mods will make the
>engine
>feel stronger since you'll be letting in more air for less throttle foot
>movement, but the full throttle power difference is negligible.
>Colin at TT once told me that you could have an 8V 2.0 breath through a
>1.0"
>diameter restrictor and it would make no difference in power when I
>asked
>him about the exact same mods you are thinking of doing. But, whatever!
>Feel
>free to bust your ass for 2 hp!
>On another note, while everybody's saying how much power they're getting
>from swiss cheesing their airbox since they're removing that HUGE intake
>restriction, I'd just like to point out that using the stock intake
>location
>(drawing air from the front crossmember) the intake air temp is
>typically 20
>deg hotter than ambient. In stop and go traffic it's typically 40-50 deg
>hotter than ambient. Sit parked with your engine running for 5minutes
>and it
>will get up to 135 deg! (data from Haltech datalogs) NOW, the message on
>this is that anybody that thinks drawing air from ANTWHERE in the engine
>compartment (MY holes are only on the FENDER side!!!) is a benefit is
>NUTS!
>The mod that Patrick Bureau has on his website about relocating the
>inlet to
>in front of the radiator is the only good input I've seen on this
>subject.
>Dan
>
>----- Original Message -----
>From: Colin <cwass99@home.com>
>To: <scirocco-l@scirocco.org>
>Sent: Wednesday, November 28, 2001 8:14 PM
>Subject: thoughts on breathing - long
>
>
>>Hi,
>> I've been thinking about how to improve my 8v breathing and I
>>figured
>I'd
>>better get opinions before I did something permanent and annoying.
>>There
>are 2
>>basic problems to breathing on my stock CIS system and they each attach
>>directly to the air box/fuel distributor assembly. The first is the
>>teeny
>>little pipe that lets air in. I removed the nasty little valve that
>>was
>there
>>and re-ran the hose directly from the box to the connection in the
>>back of
>the
>>air dam (yes, it stretched that far without difficulty and stays put).
>>I was thinking, though, that this needs to be improved upon. My first
>thought
>>was to 'swiss cheese' the box, but then I had a better idea. If I
>>were to
>get
>>a 2 inch floor drain and cut an appropriate hole in the bottom of the
>>box,
>I
>>could attach a second pipe and run it to the grill for a bit of a ram
>>air
>>effect. Done correctly and carefully, it should look quite neat and
>>tidy.
>>I've also considered cutting off the hose connection originally there
>>and
>>replacing it with a 3 inch bit of pipe. Again, it should be simple to
>make
>>this look quite appropriate. Any thoughts or comments?
>> The second breathing problem I see needing addressed is the pipe
>>that
>>joins the air box to the throttle body. If you look closely, you'll
>notice
>>it's somewhat skinnier in the middle than on the ends. I've seen a
>>couple
>>advertised replacements for this and they all seem to be based on
>>somewhat
>>flattened 3 inch piping with a 48 degree bend on one side to make it
>>fit.
>They
>>also seem to be based on copper pipe. My thought was to use 3 inch abs
>pipe.
>>Does anybody know if this stuff can be bent? I would guess liberal
>>use of
>a
>>propane torch would be helpful here, but I'm open to suggestions. I
>>think
>>staying with black abs would look most like the stock piece there now
>which is
>>important when you're building a sleeper ;) Besides, I don't have a
>>pipe
>>bender that will take 3 inch copper and I don't like the idea of paying
>lots of
>>cash for something I should be able to build myself for under $10.
>> I see both those things as extremely simple and inexpensive things
>that
>>should improve the air flow into the system substantially. My biggest
>concern
>>is that opening up things that much might be more than a basic CIS
>>system
>can
>>stand. I'd appreciate any comments on this.
>> The whole point of this exercise is to make sure I have decent
>airflow for
>>the bigger throttle body I'm going to try and get from the wrecker's
>>this
>>week-end. Any thoughts on which TB's I should be looking for? I'm
>>also
>going
>>to try to get a spare intake manifold for my engine to do the carving
>>on
>to fit
>>the new throttle body. Worst case, I go get another and try again if I
>screw
>>it up.
>> I appreciate any thoughts or comments (except on spelling or
>grammar...;)).
>>
>>Cheers,
>>Colin
>>
>>
>>--
>>Email LIST problems to: scirocco-l-probs@scirocco.org.
>>To unsubscibe send "unsubscribe scirocco-l" in the message to
>majordomo@scirocco.org
>>
>
>
>
>--
>Email LIST problems to: scirocco-l-probs@scirocco.org.
>To unsubscibe send "unsubscribe scirocco-l" in the message to
>majordomo@scirocco.org
>
--
Email LIST problems to: scirocco-l-probs@scirocco.org.
To unsubscibe send "unsubscribe scirocco-l" in the message to
majordomo@scirocco.org
_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
--
Email LIST problems to: scirocco-l-probs@scirocco.org.
To unsubscibe send "unsubscribe scirocco-l" in the message to majordomo@scirocco.org