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Building a Racer to beat a Honda CRX - Options?





Actually, I have to agree with Brian here.  That does sound silly.  





 --- On Tue 01/23, Brian McGarvey < bmcgarvey@gmail.com > wrote:

From: Brian McGarvey [mailto: bmcgarvey@gmail.com]

To: Cory_Langford@bcit.ca

     Cc: scirocco-l@scirocco.org

Date: Tue, 23 Jan 2007 20:46:14 -0500

Subject: Re: Building a Racer to beat a Honda CRX - Options?



this might seem silly.. but how about a diesel.<br><br>On 1/23/07, Cory Langford <Cory_Langford@bcit.ca> wrote:<br>><br>><br>><br>><br>><br>> Well, the 1.7 has to be almost stock.  I can port match the head to the<br>> exhaust gasket size, but not port the internals, or change the valves, etc.<br>> It is pretty much what most tracks run a production class.  Very limited<br>> work allowed on engine and trany.  Unlimited on brakes, suspension, etc.<br>><br>> So swapping the head is a no go, and putting in a full 1.8 to match the<br>> better head bumps it into the very bottom of the next class.<br>><br>> I guess the next question is, does the old 1.6 flow better?<br>><br>> I have to look into carb restrictions.  I know you can't add dual carbs if<br>> it only came with one, but I am not sure if you can change the carb or<br>> rejet it etc.  Never thought carbs until I just started thinking about the<br>> old 1.6L.  Did they not have a carb'd model?<br>><br>> There is a new class 
for up to 1500cc with carbs only.  Seems like the 90HP<br>> civic hatchbacks are hitting that one.<br>><br>> The tranny I have to use the stock gear ratio, but I can change the final<br>> drive and add any kind of dif I want.  So quaife would be a requirement to<br>> get all the power to the ground out of the corners I would suspect.  And I<br>> did bump into a 4.5 (I think it was) final drive set from eurosport (I<br>> think it was)<br>><br>> I know the 1.7's top out really low on the RPM, so I was wondering if going<br>> the other way on the final drive might help.  With the long gears, use the<br>> smallest final drive I can find to keep the lower revs (2500-3500) into the<br>> max. speed possible rather than constantly running it up in the 5000 range<br>> where there doesn't seem to be any real power on those little beasts.<br>><br>> I am tracking down some of the Rabbit guys locally, but I have not seem to<br>> many of them in this class. There is a rabbit specialty 
class with a little<br>> more open mods allowed but only rabbits of course.  I might just have to<br>> get an old rabbit shell.  Just wanted to try it with a roc as it has some<br>> sentimental value :)<br>><br>> Cory Langford<br>><br>><br>> "Dan Bubb" <jdbubb@verizon.net> wrote on 23/01/2007 01:02:22 PM:<br>><br>> > Don't know what legal mods are, but the 1.7 might have a problem in<br>> > this class.<br>> > It's got the early head with 34mm intake valves, so there is no way<br>> > it'll match the valve area of the Honda. Being able to swap to a<br>> > later GTI head would help a lot.<br>> > Camshaft is probably pretty mild also, although I know of no way to<br>> > directly compare it to the Honda. All I can say is the torque peak<br>> > on the VW is around 3000 RPM indicating generally restricted<br>> > breathing either from a mild cam or insufficient valve area.<br>> > You'd have 13% more displacement, so you should be able to match the<br>> > Honda's peak torque rating 
despite the poorer breathing, but I can't<br>> > see any way you'll match the Honda's peak power.<br>> > And despite some of those catchy phrases about torque does this and<br>> > HP does that, I think the HP deficit will kill you.<br>> > You might be able to make up the power deficit with a close ratio<br>> > tranny, but again, don't know if it's legal to swap trannies and the<br>> > 1.7 only came with relatively wider ratio boxes.<br>> > Is anybody else running a VW in this class that could give you some<br>> > indication of its competitiveness?<br>> > Dan<br>> ><br>> _______________________________________________<br>> Scirocco-l mailing list<br>> Scirocco-l@scirocco.org<br>> http://neubayern.net/mailman/listinfo/scirocco-l<br>><br>><br>><br><br>_______________________________________________<br>Scirocco-l mailing list<br>Scirocco-l@scirocco.org<br>http://neubayern.net/mailman/listinfo/scirocco-l<br>

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