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i know this is probably the stupidest question you'll ever see, but what does BPU mean??? i see it all the time. BPU supra this, BPU supra that, but i have no clue what it is. and wahts with BPU+, BPU++, BPU+++, whats all those pluses about? neways i know this is a dumb question, but i wanted to know, thx
 

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actually its not a dumb Q?

BPU- Basic Performance Upgrades
and each "+" would be adding an upgrade to the car
this is mainly used to describe the mk4 i believe.
probably some of the mk4 guyz and Galz (if any) here can answer this in more detail.
 

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Zank's right. In the mk4 community, it means exhaust, boost controller, DP, and an FCD. Good for ~400rwhp. Adding stuff like adjustable cam gears, lightweight pullies, etc adds +. I think BPU only counts for stock twins.

Christian
 

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Yes, BPU only refers to Stock twins... Any major upgrades (i.e. single or upgraded twin turbo, aftermarket stand alone engine computer) constitutes an APU (Advanced Performance Upgrades)
 

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Here is the definitive answer:
http://www.mkiv.com/faq/faqtt.html#bpu1

1. my tt is currently stock, but i want to improve its performance. what should i do?
glad to hear you're ready to "really" join the tt club! we have found that the tt responds very well to the following list of basic performance upgrade s (bpus). these upgrades are proven (by us naturally!!) to have a high degree of reproducibility from car to car if you install all of the following:
exhaust system (most of the major brand name exhausts are fine)
downpipe with or without high flow catalytic converter (rod millan, speedtek, random technology, stillen, uprd, powerhouse & spp)
ebc or mbc (electronic/manual boost controller), not boost controllers w/ fuzzy logic (e.g.. profec a and hks evc)
fuel cut defenser (greddy bcc - highly recommended by the mkiv.com members. read why hks fcd is the same as the ffcd (using the hks fcd or the ffcd is only recommended if you have the ttc mod and 12v mod)
with the bpu installed, you can expect to obtain approximately 370-410 rear wheel horsepower (rwhp). damn, you gotta love the supra tt!!

you will also want to install a boost gauge to monitor how much boost you are running. obviously running more boost is going to decrease the life of your turbos (by how much is not really known) so you will want to watch this. a few turbos don't last long at all at higher than stock boost levels, but most seem to take the increased boost just fine. most people think the best trade off is no more than 18 psi although some have had success and longevity with higher boost. a conservative number would be to run 15 psi low boost with occasional runs to 17 psi if you get an ebc that is easily adjustable on the fly. even with a supra, you gotta be willing to pay to play...
 
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