My dream is becoming a reality

[Dan [Sac]]

Exactly (and other reasons). Not everyone wants 500hp. 300 from twins is more efficient, and provides a more usable torque curve for a daily driven car.

The plumbing to run a single in a Probe is an exercise in heat loss, poor design, inefficiency due to unequal manifold secondaries, and fitment issues.

[Phat '93PGT]

i have to stop looking at this post and watching the vids while im at work.
walking around with a bulge in my pants around a bunch of mechanics is considered uncouth.

[plx92]

but as far as technology goes twins are basically obsolete. Single turbos spool quick now and still make as much boost as you want.

please go do your hw

[MIHELA]

That is a really clean setup, reminds me of an OEM style setup. Very efficient packaging for the turbo. I imagine that rear one would be a pain to replace if it blew.

[mx6gt04]

Other then "cool" factor why twins?

Glad you are realizing a dream but as far as technology goes twins are basically obsolete. Single turbos spool quick now and still make as much boost as you want.

False.

Emissions mandates will make twins far more common than ever before. They are the furthest thing from obsolete, son.

[polarexpress17]

the most recent being the ecoboot

[MIHELA]

Another interesting one is the LF3 in the Cadillac XTS. Very cool intercooler packaging.
http://gmauthority.com/blog/gm/gm-engines/lf3/

[Brizzy]

Back in the day (late 90's)

Caterpillar started using twin turbo's on their diesel engines to escape having to conform to emission stuff. Kinda neat.

[mx6gt04]

Back in the day (late 90's)

Caterpillar started using twin turbo's on their diesel engines to escape having to conform to emission stuff. Kinda neat.

I worked on a project for Deere doing that... generally with the diesels it is for high high EGR when compound turbos are necessary (>30% or so)... which specifically targets NOx emissions at a cost of BSFC and all other emissions increases.

For the gasoline twins these days... it's all about catalyst light-off.

Without twin turbos and pre-turbo cats, turbos were threatened to be stamped out. They're a big heat sink and takes too long for them to light off from a cold start, so the EPA was wanting them gone. But... twin turbos to the rescue.

OP... let us get some more updates. I am anxiously awaiting more photos and info here!

[Dan [Sac]]

well, I think we should get back on track - this is pretty much classic PT. Guy starts/finishes amazing project, and most of the comments are PTers bickering amongst each other about irrelevant drivel.

[custmprobe]

please go do your hw

I guess maybe on smaller engines it is still hard to make a single produce a very useable/ street friendly performance? I know that with V8s twins are almost never used because you can spool a single at a low rpm now and still make all the boost you want thanks to modern turbo design.

As for the factory set ups mentioned they aren't going for major performance. They are going for fuel economy and decent performance. A middle aged man that is about to buy his BMW wants it to be quick but feel as smooth and linear as every car he has ever had. That is why many factory set ups are twins so they can run ultra tiny turbos that spool almost at idle and make a minimal max psi.

I guess the world of these V6s could be completely different then what I am accustom to. I have a hard time beliving that though because the number of twin turbos I see around here is very small. I guess I will do some learning while I am around here.

[WhiteDart]

Kinda figured the this would go off on a tangent so I waited it out.

Anyway, the goals for this. #1: Like I said up top, it is something that I've been wanting and saying I was was going to do for close to a decade. I want to do it just to do it. Sounds childish I know but then again, why do ANYTHING to a quickly fading outdated unpopular platform like the Probe in the first place? I know I do it because it makes me happy and its far from the norm.
#2: The performance aspect. Lets look at a single turbo setup on a moderately powered KL V6. The hotpipes are long as hell since they have to go from both banks, join together and get to a essentially remote turbo. Hot exhaust gasses lose a great amount of their efficiency as they cool and being a tiny 2.5L, there isnt a lot of velocity to begin with. This makes our normal turbo setup pretty inefficient. Im not saying one cant make huge power. Thats not the goal here. What it does do is move the power band way up the RPM range and with a "properly" sized turbo, we dont see full boost of a measly 8-10psi until 4k+. This is not a problem for drag racing or highway pulls, however, it can be disastrous on a twisty backroad. Where I live, there are very few straight roads. Some of the best driving roads in America are located here, so it would be a shame if I were fighting to get the turbo into boost every time I dropped below 4K. The chassis will handle much more power in the corners than N/A can provide, but the drastic increase so high in the RPM range makes it very tricky and cumbersome to navigate corners at speed. I partially solved that problem by running a smaller turbo than average so I saw full boost at 3k and it makes things far more controllable and made for a smooth linear power gain. The drawback is that power dropped off noticeably after 5k due to the turbo running out of its efficiency range. Its not a giant drop in power but it was still something that bothered me because its not right.
The solution I believe will be these twins. Together, they are equivalent to a much larger turbo compared to what I used to run, however being located right on each exhaust manifold, they will be exposed to maximum exhaust gas velocity, giving a far better efficiency range than any single could provide with our piping setup. While I was brake boosting on jackstands in the video, I saw 3psi on the gauge at half throttle at 3k. At this point I would say my theory is probably correct.

I got my bottle back for my MIG today so I will be able to finish up the y-pipe and actually be able to drive it on saturday. Saying im excited is an understatement.

[ZE Power MX6]

Niiiiiiice

[Damnit Man]

Awesome build!

[BradsPGT]

This is an awesome build. And your #1 is EXACTLY why I am boosting my probe, 'because I can' and its different than 99% of anything else you will see on the roads or at shows.

Cant wait to see this thing actually driving, I've watched your jackstand spool video like 4 times...