300 tdi with a/c loses power - Defender Source
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  #1  
Old July 12th, 2008, 09:33 PM
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Todd Miller
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300 tdi with a/c loses power

I have a 300 tdi in my Disco. It has the r380 and proper transfer case for a 300tdi. Runs and drives fine but with the use of the A/c it really lacks power on start off on a hill or incline. Today I was on a pretty steep incline and had to turn off the A/C to get power, thought it was going to die on me.
has anyone had similar probs. or any suggestions other than don't use the air.

thanks for any help.
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  #2  
Old July 12th, 2008, 09:42 PM
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How bad is it? Like odd loss of power or just loss of power? If you have not tuned the fuel pump (more power) your just feeling the result of a 111hp motor in a heavy truck lose a few ponies.
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Old July 12th, 2008, 09:51 PM
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not an odd loss. I assume it is just the a/c taking power although it is significant enough that I am considering turning off the air when stopped on a steep hill etc. It does feel like it might go dead it really chugs along like trying to start in third instead of first.

I have not tuned the engine at all. I would like too but I am not much of a mechanic. What should I do to get more power without shortening the life of the engine? I don't really know how many miles are on it. I did not do the conversion myself. The guy I bought it from said it had been rebuilt only about 5-6k miles before I bought it. I don't really believe this though because it has some serious oil leaks which I would not expect on a rebuilt eng. I have put about 12k miles on it in the past 7 months. drive it as my daily commuter.
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Old July 12th, 2008, 11:57 PM
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Todd...

I have a 300 TDi in my Defender and even with big exhaust, a higher wastegate popoff and increased injector pressure I had exactly the same problem in hot weather at Moab. I did the same thing and turned off the a/c.
May be the nature of the beast.

Clark
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Old July 13th, 2008, 12:52 AM
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Todd Miller
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thanks clark,

I love this Disco but I can't imagine using it as intended i.e. towing heavy trailers etc. I read in LRO about people claiming it is such a great tow vehicle. I don't think my Disco could tow the 7,000lb weight that the owners manual claims. maybe in low range at 15 mph.
Bummer to hear that all of the power upgrades you've done did not help the A/C problem. I have been thinking about a bigger exhaust. I have a friend with a 300tdi D90 and he installed a 3 inch exhaust, made a huge difference. But he does not have A/C.

TM
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Old July 13th, 2008, 11:19 PM
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Quote:
Originally Posted by cdb
Todd...

I have a 300 TDi in my Defender and even with big exhaust, a higher wastegate popoff and increased injector pressure I had exactly the same problem in hot weather at Moab. I did the same thing and turned off the a/c.
May be the nature of the beast.

Clark
Can you give more details about the higher wastegate popoff? I have not heard of that mod before.
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Old July 14th, 2008, 06:47 PM
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"wastegate popoff" _ I may have said it wrong but my understanding is that you can increase the point where the wastegate opens and thereby increase the turbo boost.
Correct?

Clark
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  #8  
Old July 15th, 2008, 01:57 AM
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You can send it up to me next winter. I'll fix the oil leaks and get it tuned and running better for you.

Jim Pendleton
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Old July 15th, 2008, 09:42 AM
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Todd Miller
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I would love to have it "tuned" by the famous or is it infamous Pendy! you are a bit far away though. how can I reach you to talk turkey?
thx,
Todd
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  #10  
Old July 17th, 2008, 06:02 AM
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Quote:
Originally Posted by cdb
"wastegate popoff" _ I may have said it wrong but my understanding is that you can increase the point where the wastegate opens and thereby increase the turbo boost.
Correct?

Clark
Thereby increasing the rate at which you have to replace your head gaskets.

I have noticed that the newer version of the AC system does not seem to bother the diesels anywhere nearly as much as the older version. Converted old V8 junk seems to offer the most resistance. I've installed a couple of the newer systems lately and it doesn't seem to make a noticable difference. Also put one on a 2.8 Powerstroke, but can't remember if there was any issues with that.
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  #11  
Old July 17th, 2008, 10:18 AM
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Todd Miller
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Well, I have a disco which has "old v8 junk" I guess. would it make a difference if I changed compressors or is the whole system is flawed? I don't know the part number on my comp. will have to see if it is written on it.
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