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bought a SDI


weslangdon
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Mods no but doing a good service, diesel purge, water decarbonisation and egr delete will make it run better.

Diesel purge definitely helps. Still haven't deleted my EGR yet!!

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  • 2 weeks later...

I've heard of lpg with diesel but never nitrous, care to elaborate

Ehh? To make an lpg diesel you would need to lower compression and install spark plugs.

Nitrous you know it is? You can easily add that to a diesel as diesels run "lean" anyways and anything not used just goes out the exhaust.

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Ehh? To make an lpg diesel you would need to lower compression and install spark plugs.

Nitrous you know it is? You can easily add that to a diesel as diesels run "lean" anyways and anything not used just goes out the exhaust.

An SDI with nitrous would probably run at near 120BHP, assuming you used the 75BHP jet right?

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I don't think it works that way. I don't think you get bhp jets as 75hp would do a lupo gti and a highly tuned r35. I'm not too clued up on nos wet dry etc etc. I don't think you would get 75bhp out of an sdi no matter how much nos you pumped in. But on the flip side it's safe compared to a petrol car as they have to run at certain ratios.

Would an sdi take 120bhp with out bending or cracking something? Plus if you wanted more power you would need to turn fuelling up too.

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I don't think it works that way. I don't think you get bhp jets as 75hp would do a lupo gti and a highly tuned r35. I'm not too clued up on nos wet dry etc etc. I don't think you would get 75bhp out of an sdi no matter how much nos you pumped in. But on the flip side it's safe compared to a petrol car as they have to run at certain ratios.

Would an sdi take 120bhp with out bending or cracking something? Plus if you wanted more power you would need to turn fuelling up too.

Dunno, but there's a German fella on YouTube with a 110BHP SDI. He's put a big turbo on it though and done some mapping to get it there. No idea what engine mods he's done if any at all. Smart motor though, it's got a custom ECU i think.

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Dunno, but there's a German fella on YouTube with a 110BHP SDI. He's put a big turbo on it though and done some mapping to get it there. No idea what engine mods he's done if any at all. Smart motor though, it's got a custom ECU i think.

I suppose it's proof on concept but it's pretty silly lol. I really don't know what the engine can take but doubling the power even if it is small is still impressive. It's generally the massive torque that turbos or nos produce that bend things on engines.

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I suppose it's proof on concept but it's pretty silly lol. I really don't know what the engine can take but doubling the power even if it is small is still impressive. It's generally the massive torque that turbos or nos produce that bend things on engines.

I still think a TDI is a better all round option though. The SDI really is for those who like veggie oil, and like seriously cheap motoring. My insurance this year is ridiculously cheap.

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I still think a TDI is a better all round option though. The SDI really is for those who like veggie oil, and like seriously cheap motoring. My insurance this year is ridiculously cheap.

I paid £210 and I got £70 back on topcashback.

But yeah I agree why add so much complex stuff to make it more unreliable and take away the great fuel consumption.

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I paid £210 and I got £70 back on topcashback.

But yeah I agree why add so much complex stuff to make it more unreliable and take away the great fuel consumption.

Mine was £326, but I have a fault claim to my name. Put that with the veggie oil and I can running it is pretty cheap.

Adding a turbo would also presumably remove the ability to run on veg oil because veg+turbo's isn't good. Can result in turbo failure.

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Why is that?

Not completely sure. Haven't looked into the science of it. My assumption is that the natural oil dilution which happens as a result of cold starts with veg oil causes the turbo seals to go... hence failed turbo.

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you could be right there with veg oil n turbos....

i used to run a couple of zx d turbo volcanes... with great results. come winter time tho and you could see the veg oil was getting thicker if it wasnt used as much

can't beat cheap motoring, what is it costing to fill the lupo with veg and what sorta miles you getting?

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Not completely sure. Haven't looked into the science of it. My assumption is that the natural oil dilution which happens as a result of cold starts with veg oil causes the turbo seals to go... hence failed turbo.

Hmm, if you was really crafty you could just change your oil every 1kmiles and then use that oil as fuel?

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you could be right there with veg oil n turbos....

i used to run a couple of zx d turbo volcanes... with great results. come winter time tho and you could see the veg oil was getting thicker if it wasnt used as much

can't beat cheap motoring, what is it costing to fill the lupo with veg and what sorta miles you getting?

Well, it makes sense to me because twin-tanked systems are known to work fine with turbos. The whole point of a twin-tank, whether it be SVO Controller based or manual, is that the cold start is on diesel and then you switch once the vehicle is up to maximum operating temperature. My thinking on this is, diesel evaporates at about 62 degrees C, therefore, when your car is fully up to temp, most diesel in your oil will actually evaporate through the crankcase thanks to the sheer heat. Veg oil on the other hand evaporates at something between 160-200 degrees C. Therefore, you've got no chance of it actually evaporating out of your oil, hence that rather weird smell when you change the oil. That's fine on a non-turbo SDI because they're solid engines and good quality oil (even from cheap brands) is designed to withstand some dilution. However throw a turbo in there and it's a whole different matter and I'm convinced it's the oil dilution that causes the seals to fail. That said, there are people who claim pre-PD Golf's run on veg oil no problem, so that pokes a hole in my logic right there.

I run it on SVO, it's 80p a litre for Rapeseed, so still a decent saving despite the cheaper fuel prices right now. If I can't get Rapeseed, I use Sunflower. Last year I was saving over 50p a litre. I know you can get cheaper SVO, but it's worth being careful what you stick in, in my opinion. GM Soya for example, is a drying oil and has proven links with ring gumming etc and engine failure. I can get that for about 60p a litre. but I just don't see the point in running it on something that has known links to engine failure. So I'm just happy running on this. Perhaps if the car lasts for another year, I'll start experimenting with cheaper oils. It can't be worth much anyway. I also don't use WVO because again, you can't guarantee the quality of the oil you're sticking in. It could be anything, GM Soya or corn oil or anything. Also, unless you make it yourself, you cannot guarantee it's been properly dewatered. There's a few guys in the area selling it for about 50p a litre, which is good value to be fair, but as I said, the problem is I cannot guarantee it's quality. Perhaps it's worth a try though.

Mileage wise, can't say I've noticed a difference. If it's anything at all it's negligible. Maybe a few MPG less. My record is about 500 miles on one tank, but I have to drive like a ****ing ****. That's about 79MPG. Realistically though, I get more like 400-450 which is roughly 60-70MPG. Either way, it's cheap as chips and makes me feel good :D Performance wise, the car feels a bit slower from the line, but no real difference at the top end.

Hmm, if you was really crafty you could just change your oil every 1kmiles and then use that oil as fuel?

That's black diesel that is. There are some people who actually do that. Drain their oil, filter it to 1 micron, and then run it in their tanks. No idea how long your injectors would last :D

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I think that's why turbos and veg oil don't mix. If you have a turbo it's harder to inject fuel due to higher cylinder pressure? Veg oil hates high pressure and that's why PD doesn't get on with veg oil at all. I don't think even twin tanks work with it or well for very long.

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