 | Home > Technical > 300TDi EGR / non EGR performance disparity |
 
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| MercianRover Member Since: 07 Apr 2022 Location: Culworth Posts: 141   
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Hello,
I had two identical 110 County station wagons (the '96 now sold): 1996, 300TDi non EGR, 300,000 miles and no modifications to the engine save an improved turbocharger CHRA (link at the bottom). 1998 300TDi EGR, 140,000 miles and no modifications to the engine save an improved turbocharger CHRA (link at the bottom) and an Allisport uprated intercooler. The '96 would easily hold an indicated 70 up the Lickey hill on the M42, the '98 will not. Both return the same fuel consumption so I'm pretty sure it's not injector pump settings. Note that the "improved" intercooler made little difference to the '98 The only thing I can attribute this to is the catalyst in the exhaust of the '98 but I can't remove that. This makes me think the next step would be to fit a VGT to increase boost at lower engine speeds thus reducing the amount of torque droop as the engine speed reduces. Thoughts? https://www.turborebuild.co.uk/enhanced-tu...-cartridge https://www.allisport.com/shop/performance...tercooler/ |
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6th Oct 2023 8:42am |
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| MarkBrown Member Since: 03 Oct 2022 Location: Mid Wales Posts: 462  
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Presumably the gear ratios, transfer box ratios and tyre sizes were the same?
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6th Oct 2023 9:54am |
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| MercianRover Member Since: 07 Apr 2022 Location: Culworth Posts: 141
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"I had two identical 110 County station wagons"
Yes, identical tyre sizes with the one set being swapped from the '96 to the '98 Identical R380 transmission and 1.4: transfer box Identical boost pressures The 300,000 mile vehicle performed better than the 140,000 mile one EGR (it's blanked) isn't the problem; I think it's the catalyst restricting gas flow causing the compressor (and boost) to drop off sharply. |
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6th Oct 2023 10:20am |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 1052  
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The condition of the engine is not only based on miles.. Did you check the intake track post EGR for restrictions (soot)? Not sure when the EGR was blanked. Cat, maybe you can drop an endoscope in there to inspect?
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6th Oct 2023 10:31am |
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| MercianRover Member Since: 07 Apr 2022 Location: Culworth Posts: 141
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On the '98 when the Turbocharger was replaced the inlet manifold was removed and cleaned as were the hoses, pipes and intercooler.
For the catalyst if it were partially blocked how would I clean it? Last edited by MercianRover on 6th Oct 2023 10:46am. Edited 1 time in total |
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6th Oct 2023 10:45am |
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| Chicken Drumstick Member Since: 17 Aug 2020 Location: Near MK Posts: 731
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Over the years it has been my experience that engines, particular Land Rover Tdi and Td5 untis do run differently. Some go a lot better than others. And often the ones that don't go as well, also don't respond to mods the same either. |
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6th Oct 2023 10:45am |
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| Linds Hanson Member Since: 16 Jan 2021 Location: Cornwall Posts: 486
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Try a non cat front pipe and see what happens
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6th Oct 2023 11:33am |
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| Procta Member Since: 03 Dec 2016 Location: Sunderland Posts: 5172
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I have removed Cats on diesels, and they have responded well, the 306 HDI, the turbo spools better, and so did my 300 TDI, the EGRs were blanked off, did very little difference. But my 300 TDI had a bodged EGR pipe, which made it under powered. got a blanking kit and binned the full nosh, What a difference that made, but then again, all i did was replace a bodged pipe on the EGR system and it was happy, but binned it all anyway, with the EGR. As its one less of a nightmare to deal with. Done the same thing with the TD5 and the 306. Defender TD5 90 ---/--- Peugeot 306 HDI hatch back
Success is 90% Inspiration and 4 minutes Preparation # you can make it! |
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8th Oct 2023 2:03am |
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| Procta Member Since: 03 Dec 2016 Location: Sunderland Posts: 5172
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a good rag up the box up a hill, Defender TD5 90 ---/--- Peugeot 306 HDI hatch back Success is 90% Inspiration and 4 minutes Preparation # you can make it! |
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8th Oct 2023 2:04am |
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