Does anyone know what makes up the power difference for the AJ133 between the Defender and the RR SVR/F-type R. Different Pulley, tune, etc?

 

Its all in the mapping. Theoretically you can unlock the full 550/575 horsepower just by changing the CCF files.

 

Yes, the only difference between my F Type V8S and the R and SVR was tuning. Otherwise all used the AJ133S and I understand all were mechanically identical.

 

Two comments from me


1) Mapping can't be changed using CCF to my knowledge, otherwise everyone wold be doing it. It needs a different FLASH image loaded into the engine ECU and probably the TCM as well (gear change points will likely need to change)
2) I'm not that familiar with the aj133, but on every other platform I have experience with when it comes to superchargers, the supercharger pulley size needs to be changed to get more boost before a new tune can be used.

You can't get significantly more power without adding more air as well as fuel. Tuning with a supercharger is very different technical exercise compared to a turbocharger.

There will be good reasons why the power is limited on the V8 Defender - most likely different chassis dynamics and torque requirements for off roading and emissions (much heavier than a F-type)

 

Mapping can be changed by changing the CCF. There are plenty of outlets out there that can activate more powerful maps on the AJ133 V8, the N63 BMW V8 and the AJ300 I6.

 

Can you please cite your reference for this -specifically for the supercharged aj133, not for the other turbocharged defender engines.

And for your reference, have they actually explained how they do it on the supercharged aj133?

On my P500 V8 defender

1) The actual downloaded ccf file from my car contains no reference to tuning/map/power level, anywhere that I can see.
2) There is a name plate on the actual engine that says P500. If it was software only, why would they differentiate and mark the hardware?
3) I'd like to learn how its possible to get more boost on a supercharger system without a hardware change? Can you explain it for me please? Maybe you can get a small bump by forcing you to use higher octane fuel and a small amount of fine tuning that will
eat into safety margins set by the manufacturer - but to get a significant boost, you need a new pulley.


I just performed a quick google search for aj133 tuning. They all seem to involve a pulley change for significant power boost to the SVR type level

 

JLR Active (now OEM Activations) lists the AJ133 on their website. I'm not aware of anyone being able to change the map using a GAP tool, only with JLR's in-house Pathfinder software to adjust the CCF files in the powertrain control module. Looks like it can only go up to the 518 horsepower map on the Defender with a baseline of P500 or the ROW P425. There's another company in the UK that unlocks the 542 horsepower tune on the XFR. However they claim it isn't a re-map, but its obvious they're just changing the CCF. 250 GBP for an extra 40 horsepower clearly tells me its just a remap.

https://www.oemactivations.com/power
https://lr-retrofits.co.uk/x250-xf

 

OK, but

a) Don't believe everything you read on the internet including the BS spouted by most of these 'tuning' companies to get you to sign up. I'd like to hear from someone who actually knows what they are doing and knows exactly how to do this. I'm not saying its not possible, but I need more to convince me.
Most of these $200 dollar range tunes just mess with the throttle pedal mapping to make it more sensitive in the lower pedal range and 'fake it' - but that does nothing to ultimate power
Do these companies have before and after dyno plots to prove whatever they changed actually did something real?

b) pathfinder is no longer supported for MY 2024 vehicles onwards. Are people using hacked software?

As I said, if this was so easy, why isn't everyone doing this? Do the normal 'activation' type of people that are common on this forum that use more advanced tools than GAP offer this for the supercharged engines? I haven't seen it myself.

These superchargers do have a boost bypass valve. Not the same thing as a waste gate on a turbo system. To my knowledge, you can't adjust the control of the bypass valve through mapping as its vacuum controlled.
And even if you could, it can't increase boost. This is because a roots type supercharger does not actually compress the air (unlike a turbo) - it merely supplies a volume.
When it is bypassed- the parasitics are quite low. So its used to reduce the supercharger load on the engine at light throttle - thats all its there for.

The P500 to P525 difference could just be software as its a small 5% change, but until someone with real insider knowledge comes on here to explain I'm going to let my cynicism prevail.

To get 'significantly' more power out of a forced induction engine, you need more fuel and more air and to alter the timing. The only way to alter the air part on a roots supercharger is by making mechanical changes.

 

I'm reading this and sort of wondering. What am I missing in this conversation? You can tune the everliving **** out of those V8 supercharged motors. They become hot as a fox in a pepper patch if you ring up Stuart at VelocityAp and give him your AMEX. I did it on 2 L494's with the V8 Supercharged AJ133. I do have no idea if there are component differences between the P500 and the full HP ones, which was your original question. But -- tune away.

I first tuned a L494 Sport Supercharged with a tune from Velocity AP from 510 HP to 605 HP with nothing more than a file / remap and it was fine for 2 years.. The car was under warranty. I switched it back before every dealer visit. They had no idea. We then had a 2017 SVR (short lived, a sad story) -- 550 HP. Same thing. t I think it was 620 HP. It was faster than the other car tuned.

No issues with either. All software. They recommended a supercharger pulley. I did not do it either time because of warranty and didn't want any physical evidence of my shenanigans. ie - Zero mechanical changes. I could also play with the tune aggressiveness with their little $1200 "AP" coding device and go from "stock power to wild beast mode" but usually left it somewhere in the middle. I am pretty sure they work with the Defender now.

This was all back when I was a moron relatively speaking, but... you can absolutely tune these V8 supercharged motors. At the time it was very easy to take the non SVR to SVR power, and then the SVR to some even higher level. The only downside I ever found was gas mileage. Dismal. And I went through tires way too quickly.