dump pipes

[sixtyniners]

has anyone thought of running twin dump pipes with twin dpf as like with commodore u can run twin cats...has anyone checked if the wiring could be able to be sliced together?

[GoLfMan]

it would be too expensive for minimal gain I recon.

I'd only do that if I were doing a twin turbo

[sixtyniners]

it would be too expensive for minimal gain I recon.

I'd only do that if I were doing a twin turbo

what i was getting at was i heard the flash for ecu like bluefin and st3 cause the dpf to heat up and bugger the turbo??? how true not sure remember new at this owning a oiler... so if u tune your ecu and make it go harder u then do the dump pipe for more flow???? so i thought to stop the dpf heating too much was to have twin pipes and dpf's would help? with petrol the twin cats help with flow???

[GoLfMan]

if you get a larger downpipe you'll reduce your EGT's
just get a high flow cat that will also improve the flow of the exhaust, trust the tuning companies, they wouldnt have released a flash that was going to ruin your car! That wouldnt be good business at all!

[Greg Roles]

The DPF is obviously the largest restriction in the modern diesel exhaust. Running two would be a good idea in theory, but as it's a matrix of silicon carbide coated in Platinum, well golfie is onto it, it's going to cost a packet.

I plan a dump pipe, electronically controlled. Biggest problem is fitting a second pipe in, as the DPF is big, and there's not a lot of space left.

The beauty of having it only operate at WOT is that for the small amount of time you are actually flat out, a bit of soot isn't that big a deal. For all the rest of the time, you are doing the right thing and using the DPF.

Biggest problem is the DPF has a pressure sensor before and after, and if these suddenly drop at revs, the ECU will probably wig out and throw an error / put the car into limp home mode. There's also temps and an O2 sensor, so there's a few electronic nannies to overcome.

The DPF is a soot collector, and this collected soot burns off WHEN the DPF gets hot, which is ideal. When the DPF equipped diesel goes into regeneration mode, that is the idle raises to 1000rpm, it is actually injecting extra fuel to heat the DPF up, and thus burn off the soot.

It's true a restriction in a boosted up turbo *could* cause turbo failure, but again the tunes we can buy over the counter have generally taken this into account, and you'll find they are still operating with some safety factor.

What that means is a well set up diesel, with extra heat handling capacity, and a free flowing dump pipe, could be custom tuned beyond what is readily available.

That's my end game!