Originally Posted by Sharkie
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After reading everything there are some points that people fail to realise .
Anyone can make a cheap turbo system that will work on , say a Golf VR6 , but , you need to take into consideration a few things . Its a N/A engine that your converting to forced induction so your going to need an oil supply line to the turbo , You can use the oil filter housing and tap into the oil temp switch or oil pressure switch . The oil return is a bit trickier , you need to get the right angle and size out of the turbo and into the sump . If this is wrong the bearings on the turbo dont get the right lubrication through flow/pressure and eventually they collapse . I went through 3 different return pipes before I got the angle / length right on the s3 . The coolant supply is a little easier since you only really use it to maintain operating temp of the turbo and once switched off allow coolant to flow through the turbo so it doesnt cool too quickly ! I highly recommend getting a turbo timer hooked up to an electric run on pump as is found on VR6 , t4 2.5l and most turbo VAG cars (except golf gti) . Or in the case of the VR6 , just plumb it into the turbo or even run a second one.
Positioning of the turbo is another issue . Looking in the engine bay there is heaps of room behind the engine , but the amount of heat the turbo generates means it really needs a lot of shielding so you dont melt brake booster hose or any other plastic bits on the back of the engine bay . Also pending where the turbo will sit , you may run into problems with the turbo down pipe being very close to the brake master cylinder !
Pipework is fairly straightforward as long as you have a good fabricator / welder that can do all that work . Positioning of the DV will also help with spool , as will knowing what pipe size with the turbo size and intercooler size so do your research there !
Tuning will probably be the biggest hurdle . Every Mk3 VR6 Ive tuned has either been full stand alone or just a Giac chip . I am unsure if the ECU is tunable using American based chips . We do not have OBD on our cars so our ecus are different to the ones in the US . But it may work because all you need is the base tune and manipulate that . Anyone tried lemmiwinking a mk3 ecu here in Aus ?
Anyway , after all that I would rather just get a supercharger kit , seems so much easier , probably cheaper too and more reliable . The only issues Ive heard about with charger kits is the belt coming off . For about $5k locally sourced they are a better alternative , well , unless your seeking 400hp+
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