Has anyone reflashed their 3.0SC V6 aka Tune?

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Jomcool

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I would love to see some custom tunes written for the SCV6 and deployable on common tools like SCT flash. My top two tune fixes would be the low idle up about 50-100 rpm. Second would be to hold the 1-2 shift point a bit longer as the current settings in either standard or sport mode allow the LR4 to upshift in tight turns only to downshift again when accelerating from the turn.
 

Fields Carlisle

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So I flashed the tune and wasn't happy. When pushing the throttle a normal amount everything is great until about 15-20% down the travel of the pedal when suddenly it seems to request 50% throttle. I went back to the tuning company telling them it didn't seem right and they gave me 5 versions to try but it didn't make any difference. They claim not to make any changes to anything but the "torque limit" in the ECM. Supposedly that's all jlr does to increase power across the variety of models with this engine. I've been so busy I haven't tried the last file they sent me but I'm not expecting it to be fixed. I think something in their tune is adjusting the requested vs. actual throttle mapping. Not sure, but I'm hoping eventually they'll figure it out. I don't want to flash my truck 50 times to figure it out so if this last file doesn't work I'm going to request they do testing on their own end. It definitely pulls harder at high RPM but the gains at low revs seems minimal. Coming from the VW world there are so many excellent tuners that seriously develop their tunes to adjust everything from throttle mapping to AFR, timing, etc. It seems like with this JLR tuner, they're just making minor changes to one thing. Oh well, maybe over time things will improve.
 
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jettore

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Yes, that doesn't sound fun. I'd prefer having a test vehicle on a dyno and the tuner there to dial it in live. Since there's no real data on these things, need to get some good baseline info. Do you know how they were able to tune the ECU? Using some Jaguar tuning software?
 

Fields Carlisle

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Yes, that doesn't sound fun. I'd prefer having a test vehicle on a dyno and the tuner there to dial it in live. Since there's no real data on these things, need to get some good baseline info. Do you know how they were able to tune the ECU? Using some Jaguar tuning software?
You know I don't know exactly how they managed to do the tuning. I'm going to run some logging for them with my iidtool. I think they'll be able to see when I push the pedal past a certain point where it suddenly requests a bunch more power than if I push the pedal 0.01mm less. It definitely pulls harder at higher RPM, it's just the engine still sounds like you're in a Camry so it's not all that exciting. Lol.

I think exhaust is next step.
 

Fields Carlisle

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I would love to see some custom tunes written for the SCV6 and deployable on common tools like SCT flash. My top two tune fixes would be the low idle up about 50-100 rpm. Second would be to hold the 1-2 shift point a bit longer as the current settings in either standard or sport mode allow the LR4 to upshift in tight turns only to downshift again when accelerating from the turn.
What about the annoying 3-2 shift when you roll a stop sign? It's like it thinks about what it wants to do for 2 seconds. I've noticed this car starts in 2nd not first unless I've manually selected the gear. I think JLR should've made the gear ratios slightly taller as they're quite short and to my surprise the 8-speed V6 actually turns more rpm at highway speeds than the old 6 speed V8.
 

Surfrider77

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I don't think you can just "flash" a truck with a supercharger like you do a turbo car like a VW / BMW. Those flashes will adjust wastegate actuation in a turbo system, adding more actual boost pressure. Superchargers work completely differently. I think one of the main way to seek power gains is to change the pulley. In a SC system, the blower is limited by the rpm of the belt driven system. Smaller pulley = faster spin = more boost.

Long story short, I don't think SC systems are as easy to gain (flash) as turbo systems.
 

jettore

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Most factory tunes are pretty mild so there can still be gains in a custom tune even though boost can't be adjusted on SC. Some of the hp difference in the 340 -380 rating difference may very well be in a very mild tune on the 340 variants. Of course turbo cars really get the bast bang for the buck with a tune, our SC cars the HP vs $$$ ratio will be much higher.

My preference is always a custom tune on a dyno since the tuner can really push the settings but make sure everything is within safe boundaries. Hopefully some day this is an option near me, of course with a pulley change to go along.
 

Fields Carlisle

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I don't think you can just "flash" a truck with a supercharger like you do a turbo car like a VW / BMW. Those flashes will adjust wastegate actuation in a turbo system, adding more actual boost pressure. Superchargers work completely differently. I think one of the main way to seek power gains is to change the pulley. In a SC system, the blower is limited by the rpm of the belt driven system. Smaller pulley = faster spin = more boost.

Long story short, I don't think SC systems are as easy to gain (flash) as turbo systems.
You definitely can flash tunes on a supercharged engine, that's how JLR's 3.0L V6 is offered in 340, 380 and 400hp versions. They're not making each version different than the other. The computer will adjust things like AFR, timing, etc. Audi's 3.0SC V6 is very tunable, just wish those same companies that do stuff for the VW world offered things for JLR's products. The ECUs are the same (Bosch or Denso) just different programming essentially.
 

Fields Carlisle

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Yes, that doesn't sound fun. I'd prefer having a test vehicle on a dyno and the tuner there to dial it in live. Since there's no real data on these things, need to get some good baseline info. Do you know how they were able to tune the ECU? Using some Jaguar tuning software?
You can look them up... Velocity AP. They are big in the British car brand tuning scene (well, as big as they could be with a smaller brand like JLR/Aston), but tiny in comparison to the companies like APR or Unitronic.
 

Fuji4

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Any updates on this? I was thinking about their pulley and tune.
 

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