Author Topic: Performance tuning questions. 8v  (Read 967 times)

Offline Mirage-

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Performance tuning questions. 8v
« on: 10 November 2005, 10:36 »
Well now that I have a spare engine I'm thinking of stripping it down and re-building it with the hope of increasing the performance but know absolutely nothing about what is available, what sort of prices and where to buy?

I know that there is quite a bit of work that can be done with the head  and have emailed hiflowheads for a quote but what other options are available and what sort of increases can be had from the standard 8v n/a engine whilst maintaining reliability?

What cams etc. would you guys recommend? I've seen on the piper website that they do a "ultimate road" cam kit and performance belt/pulleys.  What sort of increase would these give? Not really talking bhp but the feel of the drive, where the power kicks in etc.

What can be done to the bottom end to increase performance?
What are the benefits of lightened/balanced flywheel, race clutch, lsd etc.?
What other components may also need uprating to support the additional performance? drive shafts etc.?

Basically I don't want to go the same route as everybody else and drop a vr6 or 1.8 20vT into it.  I want it to be as standard but as nice as possible.  Same reason I opted to have my standard seats leathered instead of buying aftermarket buckets or similar.

Any advice greatly appreciated.

Thanks in advance

Ian

Offline ...joe

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Re: Performance tuning questions. 8v
« Reply #1 on: 10 November 2005, 17:57 »
it depends on how often and where you want to use it. if your going for reliability and everyday drivability, steer clear of wild cams and race clutches. all they'll do is give you greif in traffic as you'll be revving the thing to stop it stalling and a race cluthc is pretty much on/off.
lots of people would say stick a 2ltr bottom end on it but when i re-built my 8 valve i couldn't find a decent one that hadn't done tons of miles or one that looked in reasonalbe condition. i figured any would really need a re-build anyway so i bored my block out. i bought new pistons and gave them to a machiner who bored my block out to 1940 i think. then i had my head polished and ported, i already had a piper 285 cam which is nice when it kicks in but can be a pain in the arse in traffic. but i don't use mine every day so its not annoying enough that i'd ever change it to anything else.
i then got a milltek corrado g60 downpipe and had my exhaust manifold ported out to match it. so in theory, it sucks air in through a standard airbox and k&n filter, through a mildly polished inlet manifold, through a performance head compressed in a bigger volume and exited by a very efficient exhaust.

i'm not sure what power its putting out, we'll have to see what happens on the rolloing road day! but it needs the cam setting up better and i'd like to have it properly set up on a RR to get the best out of it then have the ecu tweaked/re-mapped/chipped to get the best out of the mods.

this is all on a digifant.
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Offline ...joe

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Re: Performance tuning questions. 8v
« Reply #2 on: 10 November 2005, 17:59 »
oh yeah and lightened and balanced components will make the engine more 'rev happy' but again for everyday driving you wouldn't notivce the difference enough to warrent doing it and you'll lose momentum going up hills, etc with a lightened flywheel as there is less inertia.
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Offline Mirage-

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Re: Performance tuning questions. 8v
« Reply #3 on: 11 November 2005, 10:00 »
Yeah it's the everyday driver so I guess it's a compromise between performance and comfortability in slow moving traffic.

Certainly a few things for me to start having a think about.

Cheers