Sean1933 Posted December 9, 2006 Share Posted December 9, 2006 Im going to look at a BPU TT6 Supra tomorrow, it needs abit of work which im prepared/want to do...so its going cheap The seller called me a couple of days ago and told me that the car was running 0.7 on 1st turbo and 1.0 on the second. He does not drive it much, when he does he does not drive it hard apart from on the odd occasion. He told me that he took it out to check it over and noted that it was only hitting 0.6 on 1st turbo and 0.8 on the 2nd, so standard boost. It still has one car in. He has taken it to JPS this morning and apparently it could be a pipe going to the VSV that cannot be got at without taking the starter motor off (any ideas?, the starter is on the intake side of the gbox im sure...). If its not this then its probably the second turbo, or so the seller said. He seems pretty genuine though, he could of just not told me and i probably would not have noticed the boost peak issue. Im not that fussed about this as it would be my single project anyway...but i would appreciate anyones views on what this could be. Thanks. Quote Link to comment Share on other sites More sharing options...
SupraAyf Posted December 9, 2006 Share Posted December 9, 2006 Difficult to say but it may be a case of getting your head under the bonnet and checking for loose, or even split pipes - the later types are the biggest offenders in the turbo piping configuration! Age and pipe work degradation go hand in hand. If 1 bar (and now 0.8 bar) is the best the car is producing then have both cats been removed etc etc. If anything the boost spike should increase now that the weather is turning quite nippy! How long has the guy had it in BPU state Sean? His car may be telling him something? What upgrades has the car got on top of standard spec mate? Quote Link to comment Share on other sites More sharing options...
Sean1933 Posted December 9, 2006 Author Share Posted December 9, 2006 I dont know how long its been in BPU, but he does not drive it much or hard. It has 1 cat still in apparently. Mods include cat back exhaust, filter, 1 decat, fuel cut defender, HKS AF Controller, HKS Boost Controller (not connected though). I think thats it to be honest. So you think its probably just pipework, namely a split pipe thats only leaking enough to stop it going over 0.8, ie a very small hole! What are the chanced of it being the turbo? Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 9, 2006 Share Posted December 9, 2006 TBH is that not about right the monet of boost your getting with 1 cat still in? I was getting that from my auto with the 2nd cat taken out. Maybe someone that is technical will answer soon. Quote Link to comment Share on other sites More sharing options...
Sean1933 Posted December 9, 2006 Author Share Posted December 9, 2006 I was wondering that, but he said he had hit 1.0 before...maybe it was just a boost spike or something, but im sure he meant he was holding 1.0 bar. Quote Link to comment Share on other sites More sharing options...
SupraAyf Posted December 9, 2006 Share Posted December 9, 2006 TBH is that not about right the monet of boost your getting with 1 cat still in? I would agree mate. So you think its probably just pipework, namely a split pipe thats only leaking enough to stop it going over 0.8, ie a very small hole! What are the chanced of it being the turbo? Apart from the fact that the guy mentioned the original 1bar figure to you, the whole set-up seems OK. Don't forget that this BPU busness is no exact science. It depends on the condition of cars and their set-up configuration. If you genrally apply the same upgrades to the same cars then you won't get the same output performance figures. Having the 2nd cat removed and it tuned on the correct restrictor ring should see a suitable improvement. Also, how did he record the 1-bar boost figure - his HKS BC (crap I may add) is not connected Quote Link to comment Share on other sites More sharing options...
Sean1933 Posted December 9, 2006 Author Share Posted December 9, 2006 well that puts my mind at rest. He recorded it on a Greddy Boost Guage. So why is the HKS boost controller crap? Quote Link to comment Share on other sites More sharing options...
SupraAyf Posted December 9, 2006 Share Posted December 9, 2006 well that puts my mind at rest. He recorded it on a Greddy Boost Guage. So why is the HKS boost controller crap? Good news then Sean. On the issue of BC's, there are some that best suit the Supra Sequential system and there are others that do not. The Blitz ID-III or the Blitz DSBC Type-R (not S variant though - more suited for single turbo applications) seem to have it bang on for supporting the Supe sequential system. I wouldn't touch the old HKS BC's (my own thoughts) but the new HKS seems OK. There is even a thread ongoing where Nic (Import Pimp) rates them quite highly so the likes of HKS are starting to evolve. You can't go wrong with Blitz Sir IMHO! Quote Link to comment Share on other sites More sharing options...
Sean1933 Posted December 9, 2006 Author Share Posted December 9, 2006 Certainly is good news! I dont know what model controller it is yet as not seen the car, till tomorrow that is! I will be going single anyway so if it is the turbo then its not a big problem. Nor is the boost controller, as you said its better with singles Quote Link to comment Share on other sites More sharing options...
SupraAyf Posted December 9, 2006 Share Posted December 9, 2006 No problems there mucka - best of luck with your new car (and your new project) and I hope to see some pics soon. Regards buddy, Andrew Quote Link to comment Share on other sites More sharing options...
Jurgen-Jm-Imports Posted December 9, 2006 Share Posted December 9, 2006 on my rex the boost gagues shows 1.4 bar and on the apexi power fc shows 1 bar always Quote Link to comment Share on other sites More sharing options...
Sean1933 Posted December 9, 2006 Author Share Posted December 9, 2006 Thats strange Jurgen...do you know why? Quote Link to comment Share on other sites More sharing options...
Jurgen-Jm-Imports Posted December 10, 2006 Share Posted December 10, 2006 not sure sean pip said its an old greddy style boost gauge it always reads over but on the dyno or power fc it reads an accurate 1bar always, but my greedy gaguge in car reads 1.4 bar but its in fact 1 bar according to dyno and power fc. Quote Link to comment Share on other sites More sharing options...
Sean1933 Posted December 12, 2006 Author Share Posted December 12, 2006 Well i now have the car, and the seller was right about the boost changing. Sometimes the 1st turbo would be at 0.7ish, then second turbo comes online and the pressure does not seem to change, if it does its only to like 0.8ish. Then sometimes the 1st turbo would be at 0.7ish, second comes online and sweeps around to 1.0-1.1 which seems about right. I cant get an exact reading as the gauge is on its last legs, but i def notice the difference when the guage shows 1.0-1.1. Any ideas? Possibly a VSV not opening properly or am i on the wrong path. I did wonder if it was a slightly split pipe but as its variable i cant see it being that. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted December 12, 2006 Share Posted December 12, 2006 Quite often its down to pressure tank issues, other than that its worth checking the VSVs and actuators. Quote Link to comment Share on other sites More sharing options...
Sean1933 Posted December 12, 2006 Author Share Posted December 12, 2006 any ideals how i test the pressure tank (what could be wrong?), and how do i check the VSV's and actuators? I have not readup on this yet, but if someone can give me an answer without me having to search it would be much appreciated! Quote Link to comment Share on other sites More sharing options...
meister_raul Posted September 13, 2019 Share Posted September 13, 2019 What was your problem? My Supra is full decat and still doesnt go more than 1 bar Quote Link to comment Share on other sites More sharing options...
jamesmark Posted September 13, 2019 Share Posted September 13, 2019 Holy thread resurrection. What size is your restrictor ring? If it is too small a whole it will limit you. Quote Link to comment Share on other sites More sharing options...
meister_raul Posted September 13, 2019 Share Posted September 13, 2019 it's the one from Whifbitz, so i am guessing 2 inch Quote Link to comment Share on other sites More sharing options...
meister_raul Posted September 30, 2019 Share Posted September 30, 2019 Quick update, it was a cracked hose...now it does 1.1 bar, i guess it's fine Also 0-60 is 5.2 seconds measured with "drag racer" app on android Supra bpu auto Quote Link to comment Share on other sites More sharing options...
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