Thread: ENGINE TUNING - EGT, Psi and Wideband AFR

Originally Posted by RRT

Not sure how the Patrol airbox will make a difference as the surface area of the comparative filters are roughly equal but there may be a gain there in flow as the round filter spreads the 'fins' out and certainly wont be going back to reusable. The 4" snorkel should ensure adequate air supply, have the design but this will have to wait till the shoulder is better.

How many HP are you aiming for?

As mentioned earlier, it's all simple physics, so if you have a number, the rest can be calculated from that.

An SDV6 3.0 puts out roughly 240hp, the filter is slightly bigger than the stock TD5, and from memory there are 2 MAF's and outlets.

That gives you some kind of baseline for what is possible at what filter surface area.

Good question Shack, not sure I have every thought of a target kw figure, the chase is efficiency and sustaining that efficiency. The GTB2260K that came with the Darkside kit may be a big 'larger' than optimum for off road with higher max torque rpms but the delivery has been pretty linear with your tune and drives extremely well off road even up some pretty technical sections - the 8HP will only improve on that off road with the spread of gear ratios.

They have had charts up on the website which they updated to state the figures are for a 1.9 / 2.0 litres without the boost levels, but these are generally for an on road or track 'performance' vehicle, and boy do they go, the choice for the Defender / Discovery's may have been through this lens.

new-turbo-comparison (1).jpgAttachment 188122

So the 300+ bhp may be attainable but if this results in having a fire cracker delivery it is not optimum, but 400-450Nm at around 2000-2200rpms, the rev range where I spend most time on the tracks seems a pretty good target.

Air flow is a major component of that and the restriction of airflow with a clogging K&M on particularly dusty VHC tracks and subsequent higher than normal EGT's not wanting to be repeated. A few of the VNT providers for the TD5 suggest not using a snorkel at all which defeats the purpose of upgrading if all you want to do is improve the performance on the tracks.

There is of course a larger amount / head of air with a longer 4" pipe which has to be pulled into the motor by the turbo, haven't seen a reliable figure how or even if that impacts, or what is the temp difference between air above the A pillar and pulling it from inside the fender would be - that said it is going into a literal furnace being the turbo itself which is going to heat that air up quickly and 1-5C difference at the input...