Toyboy Posted October 25, 2006 Share Posted October 25, 2006 What's the difference ? I'm thinking about buying a 93 K reg TT with 'only' 56k on the clock, but need to understand this please> If when flooring it, the car pulls smoothly till ~4000rpm, and then rockets forward, then it's BPU and not stock. If you can hardly feel a change over from the 1st turbo to both, then it's stock. Link to comment Share on other sites More sharing options...
SteveR Posted October 25, 2006 Share Posted October 25, 2006 What don't you understand mate? BPU = Basic Performance Upgrade, i.e. the performance has been improved a notch, usually by pulling the catalytic convertors out and upping the boost a bit (and putting in a slightly bigger fuel pump to cope, 'colder' spark plugs, and a fuel cut defender to not cut power with the increased boost). This has two effects and explains the above quote; - the turbos will spool a little quicker, as there is less resistance to the exhaust gases (no cats). So you get a sudden rush of power instead of building the pressure up over say a second or so, - the power the turbos help generate increases as you're stuffing more air (and the ECU will add proportionally more fuel) into the engine. Combined, this means you get 'hit' quicker, and harder when you floor it, most noticeable when the second turbo comes on-line at about 4k revs. HTH Link to comment Share on other sites More sharing options...
Prof. Monkey Posted October 25, 2006 Share Posted October 25, 2006 When the 2nd turbo comes on line you should feel a surge of power rush in. Stock they are quick. Link to comment Share on other sites More sharing options...
matt k Posted October 25, 2006 Share Posted October 25, 2006 What's the difference ? I'm thinking about buying a 93 K reg TT with 'only' 56k on the clock, but need to understand this please> If when flooring it, the car pulls smoothly till ~4000rpm, and then rockets forward, then it's BPU and not stock. If you can hardly feel a change over from the 1st turbo to both, then it's stock. To check if the car is BPU, get the garage you are buying it from to raise it up so you can check if it has been decated (you can also tell the difference by the sound as stock TT Supras are relatively quiet and decatted ones can be quite loud) also check for a boost controller and an uprated intercooler is also a bonus. Don't worry too much about buying a car that is already BPU as it would only cost about £1200 to BPU it yourself. Link to comment Share on other sites More sharing options...
Class One Posted October 26, 2006 Share Posted October 26, 2006 What's the difference ? I'm thinking about buying a 93 K reg TT with 'only' 56k on the clock, but need to understand this please> If when flooring it, the car pulls smoothly till ~4000rpm, and then rockets forward, then it's BPU and not stock. If you can hardly feel a change over from the 1st turbo to both, then it's stock. I take it from above you've copied that from a description on an advert?? What they've said doesn't make sense and sounds like they don't know what they're talking about. BPU describes a state of tune usually double decat,fcd,colder plugs and an uprated fuel pump.A car doesn't go from stock to bpu whilst driving it by the way the turbos operate. If you're looking for a car there are plently of fine examples on here or approach a trader here. At least that way, you'll be buying from someone who can explain exactly what they've done to the car rather than fob you off with half baked cack like that above. Link to comment Share on other sites More sharing options...
colsoop Posted October 26, 2006 Share Posted October 26, 2006 a BPU car is around half a second quicker over the quarter mile with a terminal speed around 10 mph higher. This is just over 400 meters ! Link to comment Share on other sites More sharing options...
chilli Posted October 26, 2006 Share Posted October 26, 2006 bpu is significantly quicker but the TT is very quick anyway so if you've not driven one before I could see why you might assume stock is bpu when it is not... if it is bpu I'd suspect it should certainly have a boost guage, and if it does it should be up around 1.2 bar (stock is 0.8-0.9) - no boost guage then I doubt it is bpu (or proper bpu). Link to comment Share on other sites More sharing options...
Gaz6002 Posted October 26, 2006 Share Posted October 26, 2006 What's the difference ? I'm thinking about buying a 93 K reg TT with 'only' 56k on the clock, but need to understand this please> If when flooring it, the car pulls smoothly till ~4000rpm, and then rockets forward, then it's BPU and not stock. If you can hardly feel a change over from the 1st turbo to both, then it's stock. Your from Hants mate - if you want i'll take you out in mine and give you a demo! BPU feels a bit like a train in the back Link to comment Share on other sites More sharing options...
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