andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Mar 21, 2022 15:07:29 GMT
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Just acquired a 2006 Jeep Grand Cherokee CRD, it's got a Mercedes 3.0 V6 Diesel.
The seller said it had been tuned and there is receipt from Kent Tuning for a stage 4 tune, which according to their website is a 23% increase, it certainly feels lively!
However, I know that often, (esp. on older petrol cars), the extra power was achieved by tricking the ECU into thinking the engine is still cold and so it just adds extra fuel.
Is that likely to be the case with this Jeep?
It's a thirsty beast at the best of times, so I'd rather forgo the extra bit of performance for better MPG.
The website also proclaims the tuning process will provide extra MPG, is this also likely?
Thanks.
Andy
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Mar 21, 2022 16:19:47 GMT
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They often say improved MPG but that is usually based on the premise that the extra torque wth these upgrades means you use fewer revs thus smaller throttle input and less fuel, it's never true.
Is that engine N/A or turbo?
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Needs a bigger hammer mate.......
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Mar 21, 2022 17:06:53 GMT
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It's a Merc OM 642 with turbo, it's a 5 speed NAG 1 auto box and I do drive it very lazily.
So you think it'll burn more diesel regardless, not really looking for performance (it's a Jeep 4x4!), but would like to squeeze as much MPG.
Yes, I know if I worry about MPG, I should get a ecobox!
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Mar 21, 2022 17:07:45 GMT
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likely to have been remapped, rather than a tacky add on to trick the ecu
I have a diesel pug 207, I had it remapped to remove the dpf and egr systems, I asked them to keep the power the same, the reason was that no matter how you do it, the only way to more power is to burn more fuel.
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Mar 21, 2022 19:22:44 GMT
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The receipt does say the EGR removal, so at least that's good.
It does pull very well on kick down, so maybe I'll trust it!
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Mar 21, 2022 19:57:52 GMT
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With diesel engines you can easily map in more bhp and torque. A 23% increase is not unlikely.
Especially on vehicles where the engine is a bit light for the vehicle it actually helps economy to have more torque. The engine is less stressed and more economic that way.
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Mar 21, 2022 20:16:26 GMT
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Thanks everyone, put my mind to rest.
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squonk
Part of things
Posts: 858
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no matter how you do it, the only way to more power is to burn more fuel. Or you improve the efficiency of the engine. On common rail diesels this is usually quite possible with a remap and a change to the point on the combustion cycle where the fuel is injected. But this often comes at the expense of higher emissions. A change of 1° can be enough to make a substantial difference to emissions. |
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2004 Chevrolet Avalanche Z71
2005 Mercedes CLK320 Cabriolet
1996 Mercedes C180 Elegance Auto Saloon
1996 Rover 620Ti (Dead fuel pump)
1992 Toyota HiLux Surf
1987 Range Rover Vogue (Rusty)
1992 Range Rover Vogue SE (More Rusty)
2006 Chrysler Grand Voyager
2008 Corsa 1.4 Design
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