mk4 performance

[kylej]

Thanks for the help, I'm hoping for anywhere between 450-500whp this spring but eventually I want to make about 800whp.

As for exhaust, I meant like full turbo-back. So a new downpipe included.

[pwpanas]

Originally Posted by kylej

Thanks for the help, I'm hoping for anywhere between 450-500whp this spring but eventually I want to make about 800whp...

If at all possible I need you to be more specific; just give me one number: 450, 500, or 800.

For example, 450rwhp is achievable via BPU++++, with a low mileage/hours engine (i..e GREAT compression and leakdown numbers) and a low mileage/hours set of turbos. However 500whp is NOT feasibly achievable via BPU++++, regardless of engine/turbos condition.

If you want 800 later, you will 100% for sure need to uninstall and resell some aftermarket BPU parts that you are buying now, at that time. If you're okay with doing this, let's just completely forget about 800 for now. However, if you're not okay with the inconvenience and cost of buying, installing, uninstalling and reselling BPU-specific parts, let's just get you to 800 right now. Just mho, fwiw.

Lastly, note that there's no need to "hope". We can absolutely 100% for sure achieve any one of these numbers. Any one of them is simply a matter of carefully invested $, time, and expertise.

Originally Posted by kylej

...As for exhaust, I meant like full turbo-back. So a new downpipe included.

True, but you'll get all you need for BPU with a $300 downpipe. Just so no one else reading this thread is misled, you really don't need to buy the two together.

[kylej]

okay well lets just set it up so 800-900whp is possible, the parts may be more expensive now but I'm not into the inconvenience.

[pwpanas]

Originally Posted by kylej

okay well lets just set it up so 800-900whp is possible, the parts may be more expensive now but I'm not into the inconvenience.

Gosh. Again, if at all possible I need you to be more specific; just give me one number: 800, or 900. Each horsepower level is a significantly different configuration. Really!

After we get that nailed down, I'll need to know your application.

Oh, and is your Japanese-spec Mkiv Supra Turbo an auto or a 6spd?

By the way, have you read these two threads from the MKIV FAQ?

• http://www.toyota-supra.info/forums/...ond-supra.html
• http://www.toyota-supra.info/forums/mkiv-faq/9008-1000-rwhp.html

Lastly, it's not only that the parts are more expensive for 800+rwhp...you have to upgrade many more of them. Examples: For BPU, you don't need a new exhaust manifold, but for aftermarket turbos, you do need to replace the oem exhaust manifold with an aftermarket exhaust manifold/header. For BPU, you use the oem ecu. For 800+rwhp, you'll need to replace the oem ecu with an aftermarket ecu. Etc., etc., etc...

[kylej]

I decided I'll just go with 500 approx rwhp, give or take fifteen but 500 would be nice... Then if I want to go bigger later I can. Is this possible with bpu++++? And still reliable.

Nevermind you clearly said 450 was possible with good compression bit not 500. If I was to go with 500 still would it involve turbo upgrade?

[pwpanas]

Originally Posted by kylej

I decided I'll just go with 500 approx rwhp, give or take fifteen but 500 would be nice... Then if I want to go bigger later I can. Is this possible with bpu++++? And still reliable.

Nevermind you clearly said 450 was possible with good compression bit not 500. If I was to go with 500 still would it involve turbo upgrade?

For 500rwhp you'll need a small single turbo kit. If you want to go bigger later on, you'll need a new turbo (you'll have to remove and resell the smaller 500rwhp one), and a fuel kit.

If you want to go with the goal of 450rwhp+ and bpu++++, that is only achievable with a just-like-brand-new engine, just-like-brand-new turbos, and a 6spd. Are you willing to swap out these oem parts, depending on their mileage/hours/condition? If not, 425rwhp (with a 6spd) is probably the max you can shoot for - and even that level depends heavily on those same components already being in very good condition (but brand-new condition isn't necessary for 425rwhp). If your compression numbers are low, or your oem turbos have a lot of miles/hours on them (or they've been driven very hard), and you've got an auto transmission, 375rwhp or so may be the best your setup can achieve. Again, it's all a matter of $, time and experitise.

Again, are you 6spd or auto?

Again, what is your application?

[kylej]

6 speed manual trans, I don't think I would want a single turbo would it be possible to stay twin and reach 500whp? I just driving the car as a summer car and take it to the strip sometimes to race other people, it's like a Friday night thing at a local drag strip.

if I was to go with the 425-450 rwhp how much would it cost for the new turbo's, etc. that I would need to be brand new again?

okay I made my decision, i'm gonna go bpu++++, we will get whatever whp out of it we can without turbo upgrade, if i want i can do that and change everything later but as a daily driver 400whp approx, should do.. thanks for the help and if you could let me know what I'd need, that would be much appreciated, thanks.