ok for my non turbo s5 im getting my racing beat road race exhaust and custom piping from a shop. should i get 2 inch piping done or 2 1/4 piping. im probrably going to have them weld it to the stock mufflers until i get more money for a better exhaust. no cats because i got the air pump to open my 56 ports.



another thing i was told i could rev to about 11 grand with stock s5 rotors just needed to beef up the oil system add a extra oil cooler is this true any help would be good thanx

[quote name='1300ccTuner' date='Apr 1 2005, 02:29 PM']



another thing i was told i could rev to about 11 grand with stock s5 rotors just needed to beef up the oil system add a extra oil cooler is this true any help would be good thanx


[/quote]



You can rev to 11 grand with any series rotors. Theres a whole bunch a **** you gotta do tho. I'd recommend a clutch and maybe flywheel shield. You dont want neither exploding at 10k and cutting your legs off. (this actually happened to someone I knew)



About the exhaust question: the bigger the better, just be prepared for the loudness.

should i replace it with a stock clutch and aftermarket pressure plate? and where would you get the flywheel sheild?



and i thought if you go bigger it still would hurt my engine regardless of backpressure because i dont think thats an issue because its a s5

you would want to obviously replace both with high performance parts. why use stock equiment on a high performance application? you could probably get a sheild made. shouldnt take too long.

If you want torev that high, ide be prepared to port the motor. Go with a nice street port.

Please dont break your motor, dont rev like that unless it was built to. Isn't fuel cut at 8-9k?

The question is, can you make any decent power that high? Doesn't the power curve on a stock motor drop off before then?



As for exhaust, when I was searching for mine, I was told to go with 2.25" or 2.5", but not bigger. I went with 2.5" to a single magnaflow muffler.

exactly.... unless you are running some MAJOR port work (Bridge,p-port, j-port) you aren't gonna make any power that high anyway. Not that the engine would really hold together that high anyway.

How high can u go safely on a stock engine? Just wondering

[quote name='cdaleracer669' date='Apr 2 2005, 07:37 PM']How high can u go safely on a stock engine? Just wondering


[/quote]

I wish people will realise, its not how high you can rev, its how high wil you make power, you wont make power at super high rpms with out a bridge port or a p port. But on a stock motor I wouldnt go any higher than 7k-7.5krpms.

You know there is a thing called red line, its clearly marked on the stock tach. Need you really ask how high it can rev stock?

it has a lot to do with clearancing inside the motor as well, your side seals are natually warp due to inertia and leak some compression off, so at redline not only are you past your intake and porting "sweet spot, but your loosing compression too.



you always want to shift at your peak horsepower, and hopefully the upshift will land you in your peak torque. The only time that it would ever be beneficial to run past your peak horsepower, is if your already in your top gear and don't have the option to due so.



Not to mention the rapidly increased wear that occurs at high rpm and internal wabbleing and warping that can junk your whole motor.

[quote name='1300ccTuner' date='Apr 1 2005, 05:29 PM']ok for my non turbo s5 im getting my racing beat road race exhaust and custom piping from a shop. should i get 2 inch piping done or 2 1/4 piping. im probrably going to have them weld it to the stock mufflers until i get more money for a better exhaust. no cats because i got the air pump to open my 56 ports.




[/quote]

the road race header has dual outlets right? if so I would just hold their diameter back if i were designing the exhaust, but since your going to have a muffler shop bending pipe, you may want to take a step up inside to make up for the restricitons that those bends create.