monkey3 Posted June 21, 2016 Share Posted June 21, 2016 How can you loose 100bhp from the flywheel to wheels? Doesnt sound like an accurate dyno. No idea: https://goo.gl/photos/WWDnM3ovmAkP8iTW8 And it was on the Austec RR. Quote Link to comment Share on other sites More sharing options...
rider Posted June 21, 2016 Share Posted June 21, 2016 It makes a big difference. When I first went looing for a Supra Mk4 in 1998 I had a run out in 5. The one I chose was so much more responsive than the other 4. A different beast entirely. It'd push BMW M3's to the side of the Autobahn acceleration wish between 100 and 150mph. I've absolutely no idea what has been done to my car as all looks original. It even has the cats. I did get around to rolling road testing it in 2008 and it was pushing out 330bhp at the drive wheels so would have been around 380-400bhp at the flywheel. My car has been 100% mechanically reliable even though it's now done 110K miles. Still on the same everything bar the normal service items and a clutch (OEM clutch lasted to 108K miles before it started slipping on hard acceleration). The great thing about bpu is you can have it looking stock which means no issues with insurance. I personally wouldn't go single, but that's only because I'm a lover of cars being pretty much as the manufacturer intended. If I wanted that much more power I'd go GTR. Quote Link to comment Share on other sites More sharing options...
gordy.r Posted June 21, 2016 Share Posted June 21, 2016 Mine is full bpu , i see the figures being quoted and accept different dynos give different results , mine achieved 354 bhp at the wheels and 350lbft torque , on two different dynos, so why so many achieving 400 bhp at the wheels! In answer to the question yes makes a great difference. Mine is a 97 tt vvti tiptronic auto. Different dynos, different set ups, different conditions of engines and turbos I suppose . I achieved 385bhp and 420ft/lb on a terrible dyno with intake temps through the roof. I could quite happily put money on seeing approx 400bhp on a cool day with proper ventilation with someone who knows how to dyno an auto Quote Link to comment Share on other sites More sharing options...
The Raven Posted June 21, 2016 Share Posted June 21, 2016 The great thing about bpu is you can have it looking stock which means no issues with insurance. I personally wouldn't go single, but that's only because I'm a lover of cars being pretty much as the manufacturer intended. If I wanted that much more power I'd go GTR. Erm you still have to tell them, in the event of a major crash they would find a FCD Quote Link to comment Share on other sites More sharing options...
safcdixon Posted June 21, 2016 Share Posted June 21, 2016 Aye best to tell your insurance company everything tbh, they will use anything to get out of paying out and rightly so imo Ive always found most mods cost very little to ad to a policy, only stuff like roll cages and engine swaps are the things that have cost me decent money in the past to ad to a policy Quote Link to comment Share on other sites More sharing options...
bluecoupe46 Posted June 21, 2016 Share Posted June 21, 2016 I'm bpu (without the front mount intercooler at the moment) and it's far far quicker than it was stock, I turned the boost back down to stock levels the other day to remind myself what it was like... No kidding it felt slower than my 170hp e46 Bmw. As for reliability, as I have seen your previous post about reliability concerns, you are very unlikely to have any problems what so ever. The only problem that you may encounter is your right foot getting heavier. If you overboost the ceramic Jdm turbos often then you will obviously blow them up, so keep the boost pressure at under 1.25bar and you're good to go! Let us know the nearest town to where you live (I wouldn't post your actual address) then there may be someone near you with a bpu car to show you the difference. And I can't stress enough how much of a difference it makes! Quote Link to comment Share on other sites More sharing options...
Alex_GT Posted June 22, 2016 Author Share Posted June 22, 2016 I am in the East Midlands, but it's more the reliability I'm concerned about, I don't want to damage the car if there is no point. I've also contacted the insurance company to see if they will insure me with the modifications, so that will have a bearing on whether I ultimately do it or not. Quote Link to comment Share on other sites More sharing options...
WayneW Posted June 22, 2016 Share Posted June 22, 2016 I personnaly have one stock aristo vvti and a bpu TT6 at home and I can say there is à HUGE difference in Power between both cars. It really makes me thinking that the bpu is THE mod to do on a supra Quote Link to comment Share on other sites More sharing options...
Tyson Posted June 22, 2016 Share Posted June 22, 2016 I personnaly have one stock aristo vvti and a bpu TT6 at home and I can say there is à HUGE difference in Power between both cars. It really makes me thinking that the bpu is THE mod to do on a supra Not a great comparison as a aristo ways as much as a house Quote Link to comment Share on other sites More sharing options...
mellonman Posted June 22, 2016 Share Posted June 22, 2016 Bpu,,,ftw Quote Link to comment Share on other sites More sharing options...
WayneW Posted June 23, 2016 Share Posted June 23, 2016 Not a great comparison as a aristo ways as much as a house ~120kg more for thé aristo... the manual gearbox add some speed impressions too Quote Link to comment Share on other sites More sharing options...
Luxluc Posted June 23, 2016 Share Posted June 23, 2016 I ran my eurospec turbos at 1.5 bar back in 2007. The performance gain was impressive Quote Link to comment Share on other sites More sharing options...
bluecoupe46 Posted June 23, 2016 Share Posted June 23, 2016 I am in the East Midlands, but it's more the reliability I'm concerned about, I don't want to damage the car if there is no point. I've also contacted the insurance company to see if they will insure me with the modifications, so that will have a bearing on whether I ultimately do it or not. As you can see, many many people have done the bpu mods, very very few supras are running stock power. Due to the map on the supra ecu they run rich. They run so rich in fact that you can add far more boost from doing the bpu mods and it will still be running rich. Running lean is one of the worst possible things that could happen, but due to the way the ecu is set up it won't. As long as you maintain it half decently, regular oil changes (as you should be doing anyway) and using high ron fuel such as shell v power you will be fine. Just dont run your turbos past 1.25 bar of boost (you will need a boost gauge). All you have to do is search and see how many people have done these mods, ive never heard of a bpu level supra having any problems. Quote Link to comment Share on other sites More sharing options...
Hemanhead Posted June 23, 2016 Share Posted June 23, 2016 Take it to the track. Mph doesn't lie A proper bpu spec runs +/- 120mph in the quarter, which is around 400whp depending the dyno you use. Mph might be a little lower 116-118mph using 98ron fuel. No they don't, they dont get near 120mph, you will need around 550bhp for that. Typically they see 108 to 112mph on a low 13 second run. Quote Link to comment Share on other sites More sharing options...
JasonR24 Posted June 23, 2016 Share Posted June 23, 2016 Just out of interest what boost on stock turbos will make the stock injectors run at full duty? Quote Link to comment Share on other sites More sharing options...
Nemesis Posted June 23, 2016 Share Posted June 23, 2016 My Supra's been bpu for 7 years with no issues so far. (probably jinxed it now.) One thing to watch for is the change in power delivery... it becomes less linear.( not that is was that linear to start with.) When No. 2 tubby comes in at bpu it will punch you hard so be in a straight line before flooring it. Also, upgrade the brakes to UK spec first, you'll need the extra stopping power. The cost of bpu is defo worth it for the gains you'll get and the fun you'll have. Quote Link to comment Share on other sites More sharing options...
Scooter Posted June 23, 2016 Share Posted June 23, 2016 I am in the East Midlands, but it's more the reliability I'm concerned about, I don't want to damage the car if there is no point. I've also contacted the insurance company to see if they will insure me with the modifications, so that will have a bearing on whether I ultimately do it or not. Run it at 1.0-1.1 bar it'll be a nice improvement over stock and will leave you a bigger safety margin. It is a very safe/reliable upgrade however problems are not completely unheard of so you are wise to consider the options carefully especially on a budget. Quote Link to comment Share on other sites More sharing options...
Tyson Posted June 23, 2016 Share Posted June 23, 2016 Bpu itself rarely gives any problems but going bpu tends to show up any underlying issues the car already has. Quote Link to comment Share on other sites More sharing options...
Axl Posted June 23, 2016 Share Posted June 23, 2016 Stock = meh Bpu = oh this is fun Single = nothing nothing OH MY F@¥#%NG GOD! Quote Link to comment Share on other sites More sharing options...
Alex_GT Posted July 12, 2016 Author Share Posted July 12, 2016 Might have to give up on this, getting ridiculous quotes on insurance and my current provider won't cover me on BPU mods, so I guess the decision has been made for me! Quote Link to comment Share on other sites More sharing options...
drift_bear Posted July 12, 2016 Share Posted July 12, 2016 Might have to give up on this, getting ridiculous quotes on insurance and my current provider won't cover me on BPU mods, so I guess the decision has been made for me! Who are you with? The companies I've been with never bothered to much about it aslong as it was declared Quote Link to comment Share on other sites More sharing options...
Alex_GT Posted July 12, 2016 Author Share Posted July 12, 2016 Admiral. Quote Link to comment Share on other sites More sharing options...
drift_bear Posted July 12, 2016 Share Posted July 12, 2016 I didn't have a problem with them previously on my last supra at BPU Quote Link to comment Share on other sites More sharing options...
shaz2010 Posted July 12, 2016 Share Posted July 12, 2016 Try performance direct mate . Quote Link to comment Share on other sites More sharing options...
Alex_GT Posted July 13, 2016 Author Share Posted July 13, 2016 Yeah I tried them, they were double the price I was getting on regular price comparison sites. What exactly is the trick here when adding mods? Do most people give hazy details or not bother declaring them at all? Quote Link to comment Share on other sites More sharing options...
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