compound turbo

[myvolkswagen]

Soo I am going to do a compound turbo set up on my 1.6 and I have a k14 and a t3. I was gonna try to run an hx35 because they are readily available but I read another thread that basically said it wouldn't work very well. Any opinions on what I should run that would be fairly easy to get and wont cost me an arm and a leg

[honda_is_the_best]

people have said that the K14 and K26 work well together. do you know about compound turboing? you can get ALOT of boost this way. if you are not careful, it will destroy your engine. you can get 60+ psi easy. that will explode a VW diesel usually..

the T3 might be a bit small for a LP turbo..

ko3 and T3 might work well together..

[myvolkswagen]

ill just run two boost controllers lol. I no a little about the compound setups. you would make 60+pounds of boost with a k24 and k26? Its just kind of a novelty for me. I like the quick spool up so im thinking of running the k14 infront of the t3? It should make a nice amount of boost and at a low rpm too

[myvolkswagen]

from what i understand you take the boost of the first turbo and the boost of the second turbo and add them together and thats how much boost your making. I also read that you run lower egt's with the compound setup so If i ran a k14 and t3 i would be making plenty of boost and it would be very reliable because i would not be looking for 25 lb of boost from a single turbo rather 10-12 from each

[sprstu]

here is how Compound turbos rock on Semi-trucks


The volume of air and PSI isnt as simple as just adding the two together, it gets exponential as you go up. Two turbos making 12psi each do not equal 24psi.

[myvolkswagen]

I kind of didnt think so but i read that somewhere. I think ill give it a shot. seems like a good way to make a wide range of power and will cost me the price of metal to try it. Im kind of surprised more people on here arent doing it. there are a few on tdi club

[gnavs]

let me know if you need a hand, Red Deer's not too far and I go through there about once a month.  At the very least I can be that guy in the corner sipping beer...

[honda_is_the_best]

if your HP turbo is making 20psi, and your LP turbo is making 8psi, the total pressure is like 53.xx psi..

run both turbos at like 4 psi and you would be alright.

you really need to build the crap out of that engine to keep the head on with compounds. head studs, metal gasket.

and why do you want so much boost? you need to fuel accordingly, otherwise it could be even slower than it was before.

if you have 2 engines set up with fueling that supports 15 psi, so, identical fueling on both engines..

one engine with 15 psi, and one engine with 30 psi, the engine running 15 psi will be making more power, just because the pistons dont have to fight that extra 15 psi in the cylinders.

you want the correct amount of boost for the amount of fuel you are burning..

talk to Truckenwagen, or RadoTD.. they are both knowledgable with compounds. Andy2 has a 400+hp cast iron headed compound turbo'd TDI.

**one of the reasons most of us IDI drivers dont do compound turbos, is because the amount of boost they produce will blow the head right off our blocks and destroy our engines, this is not something to do if you dont fully understand compound charging. you could kill your car if you werent aware of what your doing, hit the boost one time, watch the needle fly off the gauge, and then watch the dent in your hood! lol.. nah, you wont blow the head clear off and dent the hood, altho i would love to see it done some day.**

[Smokey Eddy]

RadoTD has researched this extensively. He will have some very useful input.
the 14 and a T3 will make BIG boost.


I didn't know about Andy2's TDI ... that sounds insane.
Anyways, yes compound but with small turbos. Make a wicked torque-y little turbo D
compound a really small VNT with a k14 or even k03... would work well.

[truckinwagen]

the point of compound turbos(with two different sized turbos) is not so much to make more total boost, but rather to widen the efficient range of the turbos, so you are not stuck with a small turbo  that makes good low end power, but chokes up on the high end, or a big turbo that makes lots of power but takes forever to spool up.

I just found an iron headed IDI to play with, so I will be playing with compounded turbo/supercharging here soon...

-Owen

[RabbitJockey]

a mercedes or a vw?  i thought andys car was an idi

[truckinwagen]

its a four cylinder isuzu, iron crossflow head, piston oil squirters, VE injection pump(so my hot cummins pump will work), rear wheel drive, etc...

should have it later tonight(need to go over with a battery to see if it will fire up before I buy it)

-Owen

[myvolkswagen]

the point of compound turbos(with two different sized turbos) is not so much to make more total boost, but rather to widen the efficient range of the turbos, so you are not stuck with a small turbo  that makes good low end power, but chokes up on the high end, or a big turbo that makes lots of power but takes forever to spool up.

I just found an iron headed IDI to play with, so I will be playing with compounded turbo/supercharging here soon...

-Owen
[/quote

this is exactly what i was thinking. I want low end boost and high end boost. I do not think that the k14 and t3 will be that stupid crazy because i have heard of people running hx 30's and k24's. I do have arp head studs and mls gasket and giles pump and im gonna run a boost controller for each turbo. its not like im not gonna monitor and control how much boost im pushing through. like i said my plan is not to push stupid amounts of boost through it and take it to the track. I just want to make say a reliable 20-25 pounds but i like the idea of low end torque and also boost at higher rpm. there are a couple guys around were i live that are gonna give it a shot

[myvolkswagen]

let me know if you need a hand, Red Deer's not too far and I go through there about once a month.  At the very least I can be that guy in the corner sipping beer...

I dont no if you want to be driving back and forth from red deer in the winter when i plan to have all this done lol but if you ever want to come see whats going on ill definatly show you around. We have a big shop. my brother is building and swapping an AAZ into his syncro wagon and a friend is turboing his corrado so we have lots happeneing

[truckinwagen]

the trick is to get some BIG external wastegates to properly bypass the turbos to keep the high pressure turbo from just making hot air at higher RPM's