Building a Racer to beat a Honda CRX - Options?

[bmcgarvey at gmail.com (Brian McGarvey)]

this might seem silly.. but how about a diesel.

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