140% or 140 g/s?

 

its got to be mass flow rate. I think 140kg/s would be pretty close to the upper realistic reading of a 4.6

 

A solid rule of thumb for determining HP values from MAF readings is derived by the following formula.

(value MAF g / s) / 0.82 = hp


Based on this, I would say it Max's out around ~180 g/s.

217HP X .82 = 177.94

 

for whatever reason, they set these things up incorrect with the ECU. To make any reasonable power changes, we need to start with ECU tuning before you add any mods.

i honestly think we need to figure out a way to reprogram the ECU without sending it to England for a week.

 

I would completely agree, I may have to reach out to my friend at Peerless Overland and see if they have any information on ecu tuning.

 

Cool. keep us updated. the way i look at this, everything is there for more power, its just limited by whatever the ECU has in place.

 

Like I said 140%, I am seeing 242 g/s via the ultra gauge. Now based on my calculations like you I thought the same thing it should be around 180g/s. Now if we do the whole horsepower calculation I know I am not building 290 horsepower on this engine. So that leaves me to believe my maf is wrong in the information it's sends the computer. The other option is that the factory intake duct and air box are so restrictive that they starve the engine for air which could absolutely be a cause for lack of power.

 

180g/s is not what it should max at. This should be the number you see if your engine is running at max efficiency according to the 217bhp that Land rover states the engine has.

 

I'd say check out the MAF as an issue since that's easy to do. The only part of the factory box that should be very restrictive is the inlet from the quarter panel. The size of that seems kinda small to me, though I haven't actually measured it. The rest of the restriction, I think, should just be caused by turbulence inside the intake from the chamber mufflers and the ridges. Of course, that could be it. Turbulence creates a LOT of restriction if it occurs just right. I'm going to see if I can get any readings on my MAF soon. I've got the engine half way apart today to do timing chain/oil pump, but as soon as it's back together I'll see if I can get a reading from my MAF. If both our MAFs are correct then I should get a higher g/s than you have because of my mods.

 

Alright, so I got my truck back together this morning (write up will be up in a bit!) At WOT my MAF readings never went over 168 g/s, which I tested on three seperate 0-65 pulls.