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YOUR RESEARCHNew camshafts, exhaust and chip
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Run into him sometime
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The deal was done and the new owner when I ran into him sometime after was quite happy with the car.
Leading evidence: 'Run into him sometime' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace cam shafts, the exhaust and "the chip"' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
I was thinking, how many hp can I gain from replacing the cam shafts, the exhaust and "the chip"?
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Suggestion · Original poster
No I am not planning to tear down the engine, just open the cam shaft covers and replace the cams (or whatever thay are called).
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Hello
I found some "sport" cam shafts at a dealer for around 2000 EUR. I was thinking, how many hp can I gain from replacing the cam shafts, the exhaust and "the chip"? What would be a reasonable power gain?
I sounds like it would give a good bang for the buck, doesn't it?
I have a 996 C2 2002.
Robert
The Porsche engineered X51 option added 25 HP but in addition to the parts you listed also included CNC ported heads & intake manifold so you might get half that gain mostly at high rpm.
I don't know about Porsche engines but in my day working on Chevy's & Ford's adding just a cam would often result in worse performance unless you opened up exhaust, intake and most times had head / valve work done.
No I am not planning to tear down the engine, just open the cam shaft covers and replace the cams (or whatever thay are called). If it makes sense of course...
Robert
Unless you can find someone who's done what you're thinking of doing and can report receiving good bang for the buck you're pretty much on your own.
It has been a while since I did any cam swaps but before I did any I would read up on all the various camshafts offered and compare the dyno charts to get a feel as to what I was getting and getting into. This was before the 'net so I would consume any car mag that had a review of the cam or sometimes several of the aftermarket cams being offered.
Often to get full benefit of the new cam additional changes to the engine were needed: improved intake and exhaust to name two.
And in some cases the new cam or aftermarket cam was crap.
In one case I installed an aftermarket cam (name brand too) and some time later -- I do not recall the miles now the engine had covered but the miles were way past the break-in miles -- I received an offer from someone (a car salesman believe it or not) offering to buy the car, making an offer that I could not refuse.
The deal was done and the new owner when I ran into him sometime after was quite happy with the car. But he added that he found the aftermarket cam had a flat lobe. I was thinking oh oh here comes the hit for some kind of warranty when he surprised me and said he already fixed the engine by just installing a factory camshaft. Everything else was just fine and he reported the engine perked right up and he was quite happy with its performance. (The afermarket cam probably had a bad heat treatment which is not uncommon I read, even today.)
My advice is unless you know what you are getting yourself into you are better off sticking with stock parts in this case the stock cams.
Sincerely,
Macster.
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