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Discussion Starter · #1 ·
Re: I run 11.25-11.5:1 on with 92

> i) I've read here somewhere that the flat
> tops + N42 unshaved = 10.4:1CR. How high is
> my compression likely to be? It was street
> driven and I have had only limited seat time
> thus far but it did not ping.

That sounds right for what you say is there.

> ii) I've also read somewhere here that the
> N42 carries the largest stock valves.Is this
> what he meant? Or are there even larger
> valves than those on the N42? And it is
> fairly cheap and easy to have done?

No, he meant that those are the largest available for both valves. All heads after the N42, Z wise that is, have the same size valves. I wouldn't worry about getting even larger valves, for fairly significant work is required to get full benefit from them.

> iii) How much power (@the wheels) could a
> set up like this put out? How much power
> does yours put out?

@ the wheels is very subjective. It depends of the condtion of your trans, rear end, etc... But you can estimate that anywhere from a low of about 12hp,(mine), to 30 hp is robbed from the driveline. I would say you are putting 140-150 to the wheels, if it has a decent cam in it. Otherwise, stock cam, plus what you said above, 135. That is nothing to sneeze at, since the car weighs so little. For motors that have been worked over fairly extensivly,(Mine, Chris's. both 3.1's, are putting from 180-200 to the wheels). And we are both running in the 13's in the 1/4 mi,(he ran slicks and a lsd, so is faster). But if you are happy with the power, it doesn't matter how much it has, unless you bench race a lot.
 

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Re: I run 11.25-11.5:1 on with 92

> That sounds right for what you say is there.

> No, he meant that those are the largest
> available for both valves. All heads after
> the N42, Z wise that is, have the same size
> valves. I wouldn't worry about getting even
> larger valves, for fairly significant work
> is required to get full benefit from them.

> @ the wheels is very subjective. It depends
> of the condtion of your trans, rear end,
> etc... But you can estimate that anywhere
> from a low of about 12hp,(mine), to 30 hp is
> robbed from the driveline. I would say you
> are putting 140-150 to the wheels, if it has
> a decent cam in it. Otherwise, stock cam,
> plus what you said above, 135. That is
> nothing to sneeze at, since the car weighs
> so little. For motors that have been worked
> over fairly extensivly,(Mine, Chris's. both
> 3.1's, are putting from 180-200 to the
> wheels). And we are both running in the 13's
> in the 1/4 mi,(he ran slicks and a lsd, so
> is faster). But if you are happy with the
> power, it doesn't matter how much it has,
> unless you bench race a lot.

In the limited seat time I've had (it's off the road undergoing floor replacement), it didn't feel very much faster than my mildly hot daily driver early scirocco. But then it had been sitting for 1.5 years. But it revved nicely to redline with no pinging.

How did you reduce your driveline loss?
 

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Discussion Starter · #3 ·
Re: I run 11.25-11.5:1 on with 92

> In the limited seat time I've had (it's off
> the road undergoing floor replacement), it
> didn't feel very much faster than my mildly
> hot daily driver early scirocco. But then it
> had been sitting for 1.5 years. But it
> revved nicely to redline with no pinging.

> How did you reduce your driveline loss?

i didn't really try to reduce my driveline loss, it was just that way. i had all new u-joints, and synthetic lube in both the gearbox and diff. i think that had a large part to do,(the two combined - joints and lube, not just one).
-bob
 
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