RPW front pipe Q's

[smugsley]

Ok so RPW now has on their website the two versions of their front pipes:

Version 1 - 2 1/4" pipes coming off the turbo, merging into a 2 1/2" high flowing Ceramic cat converter.
(http://www.rpw.com.au/shop/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=2175&category_id=292&option=com_virtuemart&Itemid=1)


Version 2 - 2 1/2" pipes coming off the turbo, merging into a 2 1/2" high flowing Metallic cat converter.
(http://www.rpw.com.au/shop/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=2176&category_id=292&option=com_virtuemart&Itemid=1)

They say that version 2, "This has improved airflow over our origonal design, which will create Check Engine Light Codes if not tuned immediately", will cause CEL issues but can this be stopped with a o2 sensor spacer or is there any other way around this without tuning (cause we cant yet)?
Cause I really want the metal cat (V2) rather than ceramic cat (V1).

[ELEGNT]

02 sensor spacer will stop cel issue

[smugsley]

Thanks ELEGNT

Thats perfect then cause they cost pretty much nothing, cheap and easy to solve the problem

[ELEGNT]

yep all the cel is that the second sensor is sensing more flow because of the freer flowing cat, and size of pipe. so just space him

[Mitsiman]

A oxygen sensor eliminator won't fix the problem. The increased airflow is not in relation to the cat converter, but in relation to the extra airflow altering the ECU load values and bringing up a CEL error on the torque request maps and the airlow limiting maps. That is why they would need to be tuned straighta way, and why they ahve not been released on the market.

But they will be very very soon ... with a modified ROM to go with them that will stop the issue. Many many things have been happening in the back ground.

[ELEGNT]

yeh but that reading of the extra flow comes off the 2nd sensor. Its not a abnormal torque related sell its a sell saying your cat is rooted. Ie. Its getting more flow, therefore space it

[Mitsiman]

No thats where your wrong, your confusin the CEL from an emmissions check verus a CEL from torque request maps.

The torque request / airflow maps picks up too much airflow through the airflow meter in relation to the TPS and theoretical engine load values. This is because hte larger front pipe with the higher flowing cat converter, is not as restrictive and allows the engine to breath more easily. The combination of V2 front pipe and cat back exhaust means the engines volumetric efficiency has increased by around 30% over stock values, and this is wht those maps are there to protect as it goes outside of there saftey values.

This is the same problem the dump pipe housings create - the breathing just improves too much.

A CEL spacer on the 2nd o2 sensor only stops the emmissions check of front to rear o2 sensor.

[Zadok]

I'm personally waiting to order the version 2 front and dump pipes once the reflash is available smugsley, as it will provide slightly better flow, and I personally want to get the exhaust right the first time :)

[ELEGNT]

just a question about the V2 how will it bolt up to the stock dump with a 2.5" pipe because if you have a stock dump max you can get on that flange is a 2.25"

im guessing you will have to buy the dump too

[Mitsiman]

It will fit up fine because the factory dump pipe being only 2 1/4" will be smaller than the hole its feeding into so no restriction. If it was the other way it owuld be a problem.
The restriction in the factory system is the insert ring from teh factory front pipe which reduces down to 1 7/8" as it feeds into the dump pipe hole.

[ELEGNT]

i meant the flange on the dump, you cant go bigger that 2.25" on between the dump and the cat as the flange is too small. if you went 2.5" you wouldnt not be able to get the bolts onto the flange

[smugsley]

Well now the reflash is going to be available heaps soon all our problems are fixed right?

we can do manifold, dump and the rest without any problems?

[Macca]

correct, and he will have some V2 front pipes that are larger diameter and metal cats soon

[smugsley]

HAHAHAHA yay!

Sign me up for all that stuff, I was holding back from buying all this stuff cause there was no reflash but now that there is there no reason not to go crazy!

[Macca]

The new RPW gear wont be sold till its working with reflash I think, Dave will confirm

[Ayu452]

i had manifold and turbo back xhaust from rpw...no cels for over a year...had a yr solenoid...then changed to jaycar without issues....boost T i had issues galore

[alba]

chomping at the bit to get this shit in

[Davo_colt]

Has the issue with the vibrating noise caused by the RPW front pipe been solved? Has anyone got a way of removing this noise?

[smugsley]

I think the vibration that was being caused was because some of the cats in the V1 design were braking up due to the rich mixtures of highly modded colts, correct me if i'm wrong Mits. Now that the reflash is out and the V2 pipes have a metal cat I dont think that there are any more problems

[Zadok]

The vibration wasn't due to the cats deteriorating due to overly rich mixtures, that was another issue. The front pipe noise was a separate issue that I haven't heard much about of late, perhaps with a little jigging around people avoided the issue. Otherwise a more solid engine brace should also help.

[turbo box]

i dont know whether my reply helps but i'm running 2.5 inch RPW dump pipe then 2.5 inch custom mandel bent mild steel for the rest and i got the exhaust shop to take out the second cat and space the second oxygen sensor and i have had no CELS as of yet (touch wood) that is with pill removed and k/n panel filter as well.