weslangdon Posted April 15, 2015 Report Share Posted April 15, 2015 I've just bought another Arosa, this time its got a 1.7ltr taxi engine in it, are there any mods that can be done cheaply and simply to improve its performance Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 15, 2015 Report Share Posted April 15, 2015 None. None at all. 1 Quote Link to comment Share on other sites More sharing options...
weslangdon Posted April 15, 2015 Author Report Share Posted April 15, 2015 removing weights the only option then Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 16, 2015 Report Share Posted April 16, 2015 None. None at all.Mods no but doing a good service, diesel purge, water decarbonisation and egr delete will make it run better. 1 Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 16, 2015 Report Share Posted April 16, 2015 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!! Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 16, 2015 Report Share Posted April 16, 2015 Hopefully your inlet manifold isn't too manky. Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 16, 2015 Report Share Posted April 16, 2015 Hopefully your inlet manifold isn't too manky.I reckon it is Quote Link to comment Share on other sites More sharing options...
jonny s Posted April 27, 2015 Report Share Posted April 27, 2015 nitrous 1 Quote Link to comment Share on other sites More sharing options...
weslangdon Posted April 28, 2015 Author Report Share Posted April 28, 2015 I've heard of lpg with diesel but never nitrous, care to elaborate Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 28, 2015 Report Share Posted April 28, 2015 I've heard of lpg with diesel but never nitrous, care to elaborateEhh? 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. 1 Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 28, 2015 Report Share Posted April 28, 2015 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? 1 Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 28, 2015 Report Share Posted April 28, 2015 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. Quote Link to comment Share on other sites More sharing options...
jonny s Posted April 28, 2015 Report Share Posted April 28, 2015 yes nos works on diesels as well as petrols...had anyone seen vicky butler Henderson race the 1.9d golf against a nsx Honda? just for an example!!you could use lpg on a diesel but its not good lol 1 Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 29, 2015 Report Share Posted April 29, 2015 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. 1 Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 29, 2015 Report Share Posted April 29, 2015 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. 1 Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 29, 2015 Report Share Posted April 29, 2015 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. 2 Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 29, 2015 Report Share Posted April 29, 2015 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. Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 29, 2015 Report Share Posted April 29, 2015 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. Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 29, 2015 Report Share Posted April 29, 2015 Why is that? Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 29, 2015 Report Share Posted April 29, 2015 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. Quote Link to comment Share on other sites More sharing options...
jonny s Posted April 29, 2015 Report Share Posted April 29, 2015 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 muchcan't beat cheap motoring, what is it costing to fill the lupo with veg and what sorta miles you getting? Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 29, 2015 Report Share Posted April 29, 2015 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? 1 Quote Link to comment Share on other sites More sharing options...
Skezza Posted April 30, 2015 Report Share Posted April 30, 2015 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 muchcan'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 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 1 Quote Link to comment Share on other sites More sharing options...
Dblock Posted April 30, 2015 Report Share Posted April 30, 2015 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. Quote Link to comment Share on other sites More sharing options...
jonny s Posted April 30, 2015 Report Share Posted April 30, 2015 ive not known any pds to run on veg id not try in my pd lol... possibly down to injectors and or pressure? ino old peugeot/ citroens xud etc tds used to love it. Quote Link to comment Share on other sites More sharing options...
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