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Old 03-11-2005   #16
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Re: Turbo exhaust design theory by Garrett.

Would the de-cat in my current setup help matters?
this is obviously something i am going to have to sort out when i can afford
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Old 03-11-2005   #17
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Re: Turbo exhaust design theory by Garrett.

Quote Originally Posted by Alex22
Would the de-cat in my current setup help matters?
this is obviously something i am going to have to sort out when i can afford
yeah it will help, but only if it matches up to the standard downpipe as your manifold will have to go tho, there is no way it can be used with the turbo set up, I don't know if the mouting pionts are in the same area.
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Old 03-11-2005   #18
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Re: Turbo exhaust design theory by Garrett.

some DIY'ing and bending will be required then
the de-cat has a flange so in theory if the turbo manifold is manipuable (thats prolly not a word) it can have a flange welded and the de-cat can be bent to fit in the correct place.
its not a std janspeed silenced de-cat, i had a new one made up and its literally a length of pipe.

recon it could work?
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Old 03-11-2005   #19
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Re: Turbo exhaust design theory by Garrett.

Yeah, if you get another pipe made to match up then see no problem.
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Old 03-11-2005   #20
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Re: Turbo exhaust design theory by Garrett.

Ace

sorry if my questions are dumb i'm not the most mechanically minded person in the world lol
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Old 04-11-2005   #21
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Re: Turbo exhaust design theory by Garrett.

Size does matter.

A little while ago I tested my cinq with and with exhaust. Only 1 meter of 2" pipe

Difference:


Red with (fully open exhaust with only 2x76 Novitec DTM End.
Black Without. ( only a piece of pipe ending right under my handbrake)

So this is what I tried

First you get a can opener (or grinding tool)
[imghttp://members.lycos.nl/turbocinqy/forums/HT-Novitecedit.jpg[/img]

Than you discover that the inner pipe is tiny as H*ll











Than you will buy a bigger tube and drill 360 holes in it (or buy perfor plate and fold it around a tube and weld it )


The tiny tube was the last piece of pipe. With a amazing size of 27mm.
The perfor pipe was 40mm And the new one 60mm.

Than u buy some new steelwool and put it all back together with some old dampingwool. And replace it under the car.

Conclusion. Without is better but still got 8 WHP more than before and a lot more of torque and much earlier. (turbo spins sooner and)

And now you can see that a N/A exhaust (for 54BHP) isn't suitable for a 100BHP car or more cause the turbo gets to much back pressure
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Old 05-11-2005   #22
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Re: Turbo exhaust design theory by Garrett.

Quote Originally Posted by TurboCinqy1250
Than you will buy a bigger tube and drill 360 holes in it (or buy perfor plate and fold it around a tube and weld it )
Could you not have purchased perforated tube? At work we get it in various sizes made with both stainless and mild steel.

That design of back box is very similar to the Janspeed Subaru ones we have just done. I know that the box entry and exit holes were different sizes. IIRC 52mm one side and 70mm the other. A piece perf ran through it with some packing. The perf had a cone shaped TIG'ed to one end to allow for the size increase. I am guessing this is the gradual increase in sizes that are advised in the first post of this thread.
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Old 06-11-2005   #23
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Re: Turbo exhaust design theory by Garrett.

Quote Originally Posted by GeX
IIRC 52mm one side and 70mm the other. A piece perf ran through it with some packing. The perf had a cone shaped TIG'ed to one end to allow for the size increase. I am guessing this is the gradual increase in sizes that are advised in the first post of this thread.
Venturi tube Styleť? Yep. makes pressure differences more gradual. Good thing to have
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Old 06-11-2005   #24
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Re: Turbo exhaust design theory by Garrett.

All that theory is correct, but that's where it ends THEORY

In real life the turbo won't run without backpressure for long since the much higher pressure on the intake side will place a large strees on the oil seals and eventually force the oil out the exhaust, just ask any coupe or Punto GT/UT owner

Large bore exhausts are good with some aftermarket turbos that come prepared to take the extra abuse but the stock units will fail rather quickly, in my experience with various turbos they last almost half of the normal lifetime

Most people agree with me including Garrett so i've no ideia where that info comes from, just check out the warnings that comes with some new turbos "Do not run turbocharger without exhaust for extended amounts of time"

But as i say to each they're own
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Old 06-11-2005   #25
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Re: Turbo exhaust design theory by Garrett.

what size bore exhaust would you suggest for a 1242 low boost turbo smokeme?
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Old 06-11-2005   #26
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Re: Turbo exhaust design theory by Garrett.

Quote Originally Posted by smokeme
All that theory is correct, but that's where it ends THEORY

Most people agree with me including Garrett so i've no ideia where that info comes from, just check out the warnings that comes with some new turbos "Do not run turbocharger without exhaust for extended amounts of time"

But as i say to each they're own
Errrrr, the theory was written by Garrett, so are you contradicting yourself or Garrett or what, if not what exactly are you trying to say cos its leads no where
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Old 06-11-2005   #27
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Re: Turbo exhaust design theory by Garrett.

think he's just pointing out the differences between theory and practice?
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Old 08-11-2005   #28
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Re: Turbo exhaust design theory by Garrett.

Quote Originally Posted by arc
think he's just pointing out the differences between theory and practice?
Yeah but in so doing he quotes Garrett when it was a flaming Garrett engineer that wrote it, so kinda contradicts himself if you follow.
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Old 08-11-2005   #29
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Re: Turbo exhaust design theory by Garrett.

but first guy was talking only about theory..
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