2.5" Downpipe+Decat

whitegtipolo · Post by **whitegtipolo** » Fri Oct 10, 2008 9:38 am

Had it fitted yesterday 2.5" and no cat, connected to my straight through cat back which i had already, now it boosts alot harder to the red line with none of that annoying pause halfway through boost and pops now and again!! I would recommend it if you have a remap makes the world of difference! Dunno bout on a standard system but with full system its great and now sounds mint! Only downside was one of the studs snapped in the turbo so thats gunna have to come off at a later stage to have it drilled out

but its not blowing so ok 4 now !!

whitegtipolo · Post by **whitegtipolo** » Mon Oct 13, 2008 7:31 pm

cheers 4 the interest guys

yorks GT TDI · Post by **yorks GT TDI** » Mon Oct 13, 2008 7:45 pm

whitegtipolo wrote:cheers 4 the interest guys

lol

bet it sounds good my leon i had with a decat it use to sound great on boost

have fun with that stud

oliverpologti · Post by **oliverpologti** » Mon Oct 13, 2008 7:50 pm

what exhaust system do you have on it get a sound clip up of what it sounds like cant wait to hear it

chrisjames · Post by **chrisjames** » Mon Oct 13, 2008 8:04 pm

oliverpologti wrote:what exhaust system do you have on it get a sound clip up of what it sounds like cant wait to hear it

yeah definitely get a clip up, sounds good

Jeff GTi · Post by **Jeff GTi** » Mon Oct 13, 2008 9:40 pm

ill bet its loud haha

mines got the resonated milltek and is loud enough, but i know what you mean, sounds growly as fook with the better flow

interesting you mention a pause half way through? i would imagine this would be more a software issue? iv personally never experienced a pause pre and post exhaudst mods

whitegtipolo · Post by **whitegtipolo** » Mon Oct 13, 2008 10:22 pm

LOL it is loud, always thought the sort of pause was due to the map being aggressive! It kicks in hard but spools too quickly if you get me so the ecu was holding back the spike if im right then leveling out!thats why when i fit the J valve it kept limping as it is aggressive without it! Its a good map for the price i paid!
But stage 2 next i might go custom code or revo dunno! Ill post video of exhaust when i can dont wanna wake the neighbors !! Plus with no cat it stinks!! Defo pulls sooner and harder but now intake temps go through the roof when i drive it hard for long periods eg on the back roads! Intercooler needed next!!

...Roadrunner... · Post by **...Roadrunner...** » Tue Oct 14, 2008 10:17 am

What about the fuel consumption ?
Is it bigger with no cat ?

Rich_T · Post by **Rich_T** » Tue Oct 14, 2008 1:38 pm

whitegtipolo wrote:cheers 4 the interest guys

lol, that one cracked me up!!

yeah get a video up m8 will be good

more-bhp · Post by **more-bhp** » Tue Oct 14, 2008 8:09 pm

whitepolo - you have very aggressive map in there - in terms of boost and timing...

the ecu can pull back because of too much difference between requested and actual boost.. and because of too much knock...

so even if you use the diode mod (and having it work correctly) to disguise the boost - too much boost will still equal too much knock..

so the ecu pulls back again... its favourite trick is closing the throttle flap.

how the exhaust flows can make a difference to how the wastegate reacts so spikes are not so spikey - no exhaust gases backing up..

the aggressive maps asks for everything the car can give and more - so from the line the car is full on and very fast..I have had some fun with that map.

Its already effectively at stage 2 - the spikes make 1.4 bar boost and settle to 1.2 ish..

Lately I have been using a smoother more progressive map - not as fast low down - but then less wheel spin - and constant building power.

Chris - sort the cooling and I get you something mental especially for you...

whitegtipolo · Post by **whitegtipolo** » Tue Oct 14, 2008 9:20 pm

cheers j, it is really good now with the exhaust mod, but seems to run out of that grunt higher in the rev range if you get me, but when i was giving it large the other night the higher gears 4 and 5th lost that kick, i put it down to intake temps as the intake manifold was red hot!! But when it cooled down it was boosting really well again!

yorks GT TDI · Post by **yorks GT TDI** » Tue Oct 14, 2008 9:56 pm

this will help just got one to fit on mine

http://www.seatcupra.net/forums/showthread.php?t=133258

untill you get an intercooler

more-bhp · Post by **more-bhp** » Wed Oct 15, 2008 5:45 pm

yes defo get one of these.. I keep meaning to.. but you know what its like...

But that hot manifold is like a heater for the air you are trying so hard to cool..

the insulating gaskets have proven on dynos yo make more power...

Jeff GTi · Post by **Jeff GTi** » Wed Oct 15, 2008 6:07 pm

i run the new south performance power gasket on mine, then again now im front mounted even if im driving it continually like its stolen it honestly does not get warm, only stays cold to touch.

only barely starts to warm when its left idling on tickover, but never gets hot to touch, not nearly

yorks GT TDI · Post by **yorks GT TDI** » Wed Oct 15, 2008 6:28 pm

had a south performance on my leon was good but the other one is twice thicker its 10mm