Thread: D3/D4 Power Upgrades up to 300hp on the tyres

Yeah for sure I might give the tuner another call and ask if they will before they do their next one

And estimated cost?

$3800 exhaust (stainless but the low grade) and remap

Originally Posted by josh.huber

Landrover Discovery 4 3.0L (R&D Vehicle Needed) : TaipanXP they are in the gold coast, seems we are a target for accessories finally

Note the date this page on the website was posted - 5th April 2013. Nobody interested in having an aftermarket exhaust for nearly 1 year!
Nobody?!

I was on their site august last year when I bought mine and didn't see it then.

Originally Posted by Dougal

There is endless BS about exhausts in print and on the net.
If you really want to know, then measure your current exhaust back pressure and see how "restrictive" it actually is.

Couldn't agree more. I'd like to know what's wrong with the standard exhaust.

Originally Posted by josh.huber

Dougal Ill keep searching, but I have a website or article somewhere or maybe a book at home, that states that significant exhaust size does lower exhaust temps. As a much less restricted exhaust system aids in the scavenging effect on the engine (valve overlap and boost) allowing cooler air to flow over the top of the piston and through the cylinder. I think exhaust shops make claims to this in ways that make it unbelievable but. Yes it is true, looking around last night many shops won't remap without an exhaust upgrade.

None of this stuff is simple and fitting a larger exhaust is not always a good thing. I'd be wary of any claims of improved scavenging as basically that is all happening before the turbo and I seriously doubt that the standard exhaust is so restrictive as to affect that. Also a turbo motor generally benefits from a little back pressure to help control the flow of gas through the impeller and prevent boost creep.

I don't know much about the specifics of the disco exhaust system, so I'm generalising. I'm just trying to say, be careful. Claims of increased power from an exhaust system can be dubious as a few extra kWs at the top end may come at the expense of mid range torque. Personally, I think $3800 is a lot of money to spend on reducing your ground clearance.

Cheers,
Jon

I have never performed any scientific tests RE disco3 exhaust system flow/ restriction etc, HOWEVER, Landrover engineers spend many, many hours of analysis and design on this and quite frankly I would be reticent to swap out any exhaust system without a decent amount of analysis and measurement, IE backpressure figures under ALL load conditions like Dougal has mentioned already.

A few years back I thought I knew better than Lexus engineers, and removed the rear resonators on my LS400, and enlarged the pipework. Result? Nicer V8 sound, but NO performance increase and an annoying drone at 100km/h.

Just be careful, as Gordon says.


JC

I have put in a remap from Davis Performance Landies with Active
they claim about 550nm now
must say it goes like stink and from a lot lower rpm
TDV6 2.7