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X50 with Tubi exhaust.

threespins

Spa-Francorchamps
Joined
23 Mar 2013
Messages
259
I have been looking and learning on here since May and an now looking for my tt in earnest.
Today I drove a 2003 Turbo with X50 pack and Tubi sports exhaust.
This car drove totally different to the turbos and turbo S I have driven so far.
Those I have driven were like the Boxster a steady rush of power and then went mental.
The one I drove today had nothing unless you shoved the pedal to the floor and then from nothing to stupidly mental.
The dealer maintains it was like that because of the exhaust, but surely no one would make a sports exhaust to cause so much lag.
Your opinions to a 911 novice would be most grateful.
 
Sounds wrong to me. Had it been remapped?

MC
 
The biggest hinderance to gas flow on a turbo are the turbos themselves so the exhaust will make little difference to the performance, just the noise.
As above sounds like a remap or possibly a fault.
 
kas750 said:
The biggest hinderance to gas flow on a turbo are the turbos themselves so the exhaust will make little difference to the performance, just the noise.
As above sounds like a remap or possibly a fault.

Standard exhaust cats can cause a restriction in flow which in turn causes back-pressure on the turbos impellers, - whereas sports exhausts (equipped with cats which have a significantly lower 'cell count') flow the exhaust gas better and therefore cause less back-pressure on the impellers, allowing them to spool up faster. That's why totally free-flowing pipes (completely cat-free) are the best on turbo'd cars.

Sounds like a mix of being an X50 car (K24's) with (possibly) (a) a bad map, and/or (b) one or more boost leaks ...
 
DeathStar said:
kas750 said:
The biggest hinderance to gas flow on a turbo are the turbos themselves so the exhaust will make little difference to the performance, just the noise.
As above sounds like a remap or possibly a fault.

Standard exhaust cats can cause a restriction in flow which in turn causes back-pressure on the turbos impellers, - whereas sports exhausts (equipped with cats which have a significantly lower 'cell count') flow the exhaust gas better and therefore cause less back-pressure on the impellers, allowing them to spool up faster. That's why totally free-flowing pipes (completely cat-free) are the best on turbo'd cars.

Sounds like a mix of being an X50 car (K24's) with (possibly) (a) a bad map, and/or (b) one or more boost leaks ...
Indeed.. but as I say the the exhaust on that spec of car will make little difference to that car and would certainly not produce the symptoms described.
 
This is unlikely to be anything to do with the exhaust. Exhausts can change the total power by reducing back-flow but the oomph we feel si the torque profile. Tis is influended by the size of the turbos and the engine map as well as mechanical issues that can affect the turbo's spooling such as pressure leaks in the boost system.

My money would be on ruling out pressure leaks and either putting the car back to a stabnndard X50 map or re-mapping it by someone who really does know what they are doing with re-maps.

Sadly, there are far more people out there who offer vanilla flavour maps without realising that a Porsche Turbo needs a Chocolate Nut Sundae.
Anyone who chooses a vanilla map usually does it because they don't have the money for a Chocolate Nut Sundae and vanilla will do.

That's my 99 Flake's worth on the ice cream cone.
 
kas750 said:
DeathStar said:
kas750 said:
The biggest hinderance to gas flow on a turbo are the turbos themselves so the exhaust will make little difference to the performance, just the noise.
As above sounds like a remap or possibly a fault.

Standard exhaust cats can cause a restriction in flow which in turn causes back-pressure on the turbos impellers, - whereas sports exhausts (equipped with cats which have a significantly lower 'cell count') flow the exhaust gas better and therefore cause less back-pressure on the impellers, allowing them to spool up faster. That's why totally free-flowing pipes (completely cat-free) are the best on turbo'd cars.

Sounds like a mix of being an X50 car (K24's) with (possibly) (a) a bad map, and/or (b) one or more boost leaks ...
Indeed.. but as I say the the exhaust on that spec of car will make little difference to that car and would certainly not produce the symptoms described.

Agreed; the exhaust will not be the cause of the problems stated by the OP for the particular car he refers to. However, my point was that your statement about 'exhausts making little difference to performance' is not the case - especially not in turbo'd applications.
 
Thanks guys, I thought as much. A very nice car for £25k, 64k miles, big spec, FPSH, just the o/s door filling with water.
If it had been grey or silver might have delved a bit further, but who knows how much to put right.
 
I've not driven an X50 so don't know for sure. There are a lot of reviews that say the X50 has more Turbo lag than the standard Turbo because the lag is inherent in the larger Turbo's.
 
I found that one practically unsafe to drive, can't imagine anyone would produce a car like that.
 
threespins said:
I found that one practically unsafe to drive, can't imagine anyone would produce a car like that.

Its probably a bad map, did you manage to see what boost it ran on the boost gauge??

The K24 Turbos do have more lag than the K16's do.

When you say unsafe, do mean that there was no power than a big surge?? What rmp did the power kick in at??
 
Exactly, no power at low revs, just a massive shove if you floored it. Unfortunately driving a strange car in strange surrounding I did not take much notice of boost or revs.
 

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