de-cat pipes

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26-07-09, 15:14
ste

de-cat pipes

anyways as some of you no my car has a ok spec and was mapped at 1.1bar and got 476.3bhp at the fly wheel but while gettin alignment done yesterday i noticed car was still runnin factory cat... i not mechanically minded at all and my mapper never told me i still had standard cat so by fittin a decat will it improve the car much???? and also will it rduce my turbo lag??? i am runnin apexi rx-6 top mount turbo and full boost is at bout 4700rpm so as ya can imagine the lag is very annoying

any help appreciated
26-07-09, 17:49
Greg

The less retrictions the exhaust gasses have to pass through the better. The turbo should boost earlier, and harder with that gone. Well that's if there is a restrictor in the cat like there was on my Chaser. :)
26-07-09, 19:46
ste

but even by lookin at pipes the cat pipe is so much smaller
26-07-09, 20:18
Greg

Get one so. Expect a a noise increase too. :D
26-07-09, 20:24
ste

ill be fuckin deaf lol:D
27-07-09, 20:31
colm

are you still running a lamba?

The lack of restriction in the exhaust with a de-cat can help you get on boost that bit quicker and might mean your map isnt giving the fuel needed in the right places any more, so keep a slight re-map in mind when you go about doing it :)
27-07-09, 20:45
ste

Quote:

Originally Posted by colm

are you still running a lamba?

The lack of restriction in the exhaust with a de-cat can help you get on boost that bit quicker and might mean your map isnt giving the fuel needed in the right places any more, so keep a slight re-map in mind when you go about doing it :)

no buddy lambda is not fitted wat difference will that make
27-07-09, 20:50
colm

the lamba monitors the afr's constintanly so it can tweek your map if your running a little rich or lean.

Without it its running the way it was tuned with your current set up so might get a bit lean as your coming on boost with a de-cat
27-07-09, 20:52
ste

Quote:

Originally Posted by colm

the lamba monitors the afr's constintanly so it can tweek your map if your running a little rich or lean.

Without it its running the way it was tuned with your current set up so might get a bit lean as your coming on boost with a de-cat

ya serious ye?? fuck id hardly have to pay for full remap again would i:confused:

didnt realise it'd make that much of difference... would i be able to tell myself by drivin it its runnin lean as my mapper is over 2hrs away
27-07-09, 20:58
colm

It shouldnt be a full remap, the bottom and top end of the map wont have changed but maybe the 1500rpm just as you come on boost might need altering a little. Its grand changing them on cars that havent had a remap and that are still running lambda's cos its able to give a little extra juice where its needed

Handiest way to tell is if you can borrow a wide band lambda sensor for a day and just keep an eye on your afrs before and after the de-cat. Then youl know for sure :)

running lean isnt someting you wanna mess with, especially when your running your sort of power. youve got lots of juice flowing.
27-07-09, 21:08
ste

i not mechanically miinded at all, ill email my mapper and see wat he thinks... thanks buddy i dont care bout more bhp just wanna get lag down a tad
27-07-09, 21:10
colm

i know what you mean man, lags a bitch :(

Having a chat with your mapper will be best, he really shouldnt charge you for a full map to alter less than a quarter of the fuel table. It shouldnt take long at all.
27-07-09, 21:11
ste

thanks for you help man:D
27-07-09, 21:15
colm

no bothers dude, good luck getting rid of that feckin lag :D
27-07-09, 21:25
ste

Quote:

Originally Posted by colm

no bothers dude, good luck getting rid of that feckin lag :D

she still skids, just needs some brute force and ignorance:o
27-07-09, 22:03
Frankae86

Thats what your clutch is for :)
27-07-09, 23:01
nissan_doctor

Quote:

Originally Posted by colm

1500rpm just as you come on boost

:D:D:D:D:D:D:D Ste should be so lucky!

I'd say robbie will tweek the map for you cheap enough.
28-07-09, 18:32
ste

robbie quoted me €120 for 1st hour and €80 per hour there after for few tweaks:(
28-07-09, 18:35
podge

use a holset hx35 turbo to reduce lag only 300 quid to buy new and full boost at 3700 well capable as same power as your turbo already;)
28-07-09, 18:46
colm

Quote:

Originally Posted by nissan_doctor

:D:D:D:D:D:D:D Ste should be so lucky!

I'd say robbie will tweek the map for you cheap enough.

haha man id love to see a turbo that would come on boost by 1500rpm and give that kind of power. I ment to say the 1500rpm before you come on boost

Quote:

Originally Posted by ste

robbie quoted me €120 for 1st hour and €80 per hour there after for few tweaks

jesus chirst :eek: for that little altering theres no way it should take that long
28-07-09, 20:35
Greg

Quote:

Originally Posted by podge

use a holset hx35 turbo to reduce lag only 300 quid to buy new and full boost at 3700 well capable as same power as your turbo already;)

Are they only €300??????? Was recommended one of those for the Chaser yesterday. Apparently they are good for 600bhp on high boost. Hmmmm......

Sorry for the hijack. :)
28-07-09, 21:52
podge

Quote:

Originally Posted by gregd125

Are they only €300??????? Was recommended one of those for the Chaser yesterday. Apparently they are good for 600bhp on high boost. Hmmmm......

Sorry for the hijack. :)

yes stiv in mod docs fitted one to his a few weeks back ill try find out where he got it