my03 sti ppp exhaust
24 July 2010, 03:34 PM
#1
my03 sti ppp exhaust
does anyone know the diameter of the exhaust ?
i think the bottom of the sports cat is 2.5" to the centre pipe.
i'm after the diameter of the pro drive back box joint as i want to upgrade to a 3" turbo system and keep the prodrive back box
thanks for the help
i think the bottom of the sports cat is 2.5" to the centre pipe.
i'm after the diameter of the pro drive back box joint as i want to upgrade to a 3" turbo system and keep the prodrive back box
thanks for the help
24 July 2010, 03:53 PM
#2
i am pretty sure its 2.5" as when i was speaking to my mapper about my 53ppp sti he said the prodrive backbox can be quite restrictive, i sold the car before getting it mapped, so cant tell you power it was good for.
24 July 2010, 08:35 PM
#5
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Simon, was that 2lt or 2.5lt and was there enything else done to the car to reach 353bhp?
Last edited by fastboyslim; 25 July 2010 at 07:18 PM. Reason: Poor spelling! hahahaha
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25 July 2010, 12:11 PM
#13
Simon
I currently have a bit of a Frankenstein's monster setup:-
* Syms equal length headers
* Syms sportscat (don't know if it's 100 or 200cell)
* 2.5" straight-thru - no resonators/no cats - centre (of unknown brand)
* 2.5" Prodrive bb
(I'll also add a slip-jointed 40mm uppipe when I fit those 20g/550/FMIC/3-port BCS/FPR, etc.
).
What would you estimate its max power potential is likely to be? <400? i.e. is it likely to limit the 20g's potential max output?
I currently have a bit of a Frankenstein's monster setup:-
* Syms equal length headers
* Syms sportscat (don't know if it's 100 or 200cell)
* 2.5" straight-thru - no resonators/no cats - centre (of unknown brand)
* 2.5" Prodrive bb
(I'll also add a slip-jointed 40mm uppipe when I fit those 20g/550/FMIC/3-port BCS/FPR, etc.
).What would you estimate its max power potential is likely to be? <400? i.e. is it likely to limit the 20g's potential max output?
Last edited by joz8968; 25 July 2010 at 12:23 PM.
25 July 2010, 12:17 PM
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Hi Simon, i am planning on having my 02 bug sti mapped with you very shortly. I was planning on keeping the prodrive backbox and centre pipe and using a after market decat downpipe. I am also planning on fitting a 3 port, magnex headers and up pipe. Do you think the centre pipe would be too restrictive?? Also is there any other mods you would advice on for a better mapping session?
cheers
cheers
25 July 2010, 12:17 PM
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Hi Simon, i am planning on having my 02 bug sti mapped with you very shortly. I was planning on keeping the prodrive backbox and centre pipe and using a after market decat downpipe. I am also planning on fitting a 3 port, magnex headers and up pipe. Do you think the centre pipe would be too restrictive?? Also is there any other mods you would advice on for a better mapping session?
cheers
cheers
25 July 2010, 12:21 PM
#17
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Simon
I currently have a bit of a Frankenstein's monster setup: Syms equal length headers; Syms sportscat (don't know if it's 100 or 200cell); 2.5" stright-thru centre (of unknown brand); 2.5" Prodrive bb. (I'd also add a slip-jointed 40mm uppipe when I fit those 20g/550/FMIC, etc.).
What would you estimate its max power potential is likely to be? 400?
I currently have a bit of a Frankenstein's monster setup: Syms equal length headers; Syms sportscat (don't know if it's 100 or 200cell); 2.5" stright-thru centre (of unknown brand); 2.5" Prodrive bb. (I'd also add a slip-jointed 40mm uppipe when I fit those 20g/550/FMIC, etc.
).What would you estimate its max power potential is likely to be? 400?
if you put a large turbo on it then it will still make reasonable power but the back pressure will cause issues elsewhere along with the power.
I would assume 380+ would cause you issues.. you could well get 400 but you need to then consider the back pressure and the effects on the engine, I had 416bhp on my 2.5inch exhaust, changing to 3inch allowed me to remap it to 451bhp.
A car running 500bhp on a 3inch system on the dyno we put the 2inch holed bung in the tail pipe.. it lost over 100bhp.. and the engine sounded so restricted and only sounded fine at actuator pressure.
If you want quiet then get one of the quieter 3inch systems
Simon
25 July 2010, 02:03 PM
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Hi Simon, i am planning on having my 02 bug sti mapped with you very shortly. I was planning on keeping the prodrive backbox and centre pipe and using a after market decat downpipe. I am also planning on fitting a 3 port, magnex headers and up pipe. Do you think the centre pipe would be too restrictive?? Also is there any other mods you would advice on for a better mapping session?
cheers
cheers
Panel filter change would be worth while
Simon
25 July 2010, 02:05 PM
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When we took my wr1 running sc46 with sportscat it was fine up to 360bhp. But at 400 it really started suffocating. As soon as we decated her (3" decat downpipe and remaining 3" Cobra straighthrough) it changed her into an absolute animal!
25 July 2010, 03:19 PM
#20
the problem is you need to look at it as how much will it reduce it by as a percentage rather than a how much will it restrict it too..
if you put a large turbo on it then it will still make reasonable power but the back pressure will cause issues elsewhere along with the power.
I would assume 380+ would cause you issues.. you could well get 400 but you need to then consider the back pressure and the effects on the engine, I had 416bhp on my 2.5inch exhaust, changing to 3inch allowed me to remap it to 451bhp.
A car running 500bhp on a 3inch system on the dyno we put the 2inch holed bung in the tail pipe.. it lost over 100bhp.. and the engine sounded so restricted and only sounded fine at actuator pressure.
If you want quiet then get one of the quieter 3inch systems
Simon
if you put a large turbo on it then it will still make reasonable power but the back pressure will cause issues elsewhere along with the power.
I would assume 380+ would cause you issues.. you could well get 400 but you need to then consider the back pressure and the effects on the engine, I had 416bhp on my 2.5inch exhaust, changing to 3inch allowed me to remap it to 451bhp.
A car running 500bhp on a 3inch system on the dyno we put the 2inch holed bung in the tail pipe.. it lost over 100bhp.. and the engine sounded so restricted and only sounded fine at actuator pressure.
If you want quiet then get one of the quieter 3inch systems
Simon
If I therefore change to a Cobra 3" straight thru system (from d/p back), will it free up everything? (not worried about noise lol
).Or will my existing sportscat still limit it significantly in any way?
26 July 2010, 12:18 AM
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on the standard turbo no it won't alter it much at all having the sports cat in there
if 400 then yes it will restrict it
Simon
26 July 2010, 07:24 AM
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While we are talking PPP - do the 03-05 PPP cars have cats int the up-pipe? Anyone know what changes on the PPP exhaust front to back? New downpipe? Freer flowing cat ?
26 July 2010, 10:01 AM
#26
i'm sure someone will put this right if i have got it wrong
depends what model you have, the sti has no cat in the up pipe but the wrx does.
my car currently (sti) has a prodrive sports cat at the front, straight centre section (getting rid of one cat) and the pro-drive back box. the previous owner did this to get a bit more power, nicer burble and still pass mot's with no problems.
26 July 2010, 10:47 AM
#27
Yeah, c.400 would be the 'goal'.
So what you're saying is:
A) At the moment, if I get mapped on the std VF28 I should make around 320, and therefore the exisitng sportscat and 2.5" system are fine?
B) But when going for 400, even if I did get a full 3" system, then it'd be 'wasted' somewhat, UNLESS I also changed to a full decat d/p at the same time, prior to the remap?
Last edited by joz8968; 26 July 2010 at 11:00 AM.
27 July 2010, 01:07 AM
#28