Question About Twins

[dh13]

So I am debating whether or not I want to go twin turbo on my M-TDI AHU Toyota Pickup project. I do not have the time right now to implement a standalone VNT controller to operate either of the VNT turbos that I have. I am trying to finish this engine swap by the end of my winter break. Once I determine whether or not I like the truck with this engine in it, I will be tearing it down to do a build on the AHU.

So my question for you all is: Would running a twin setup with a AHU K03 and a MK2 T3 work out alright? Or could anyone point me toward the maps for either or both of these turbos?

I am running a landy 11mm m-pump with Titan 764 (.234) nozzles. I feel that if I were to run the K03 alone I would smoke ridiculously and build a lot of hot hot heat. 

The difference in size between the K03 and T3 seem to be okay for a twin setup, but then again I know nothing compared to some one here. I know there is a thread floating around about someone doing twins. I need to find it and do a lot of reading, I know that. But any information and/or thought would be helpful.

[mystery3]

Just to clarify you're talking about compound turbos, where the turbos are in series correct? Twin turbos would be two of the same turbo generally each feeding half of a given motor.

[dh13]

Just to clarify you're talking about compound turbos, where the turbos are in series correct? Twin turbos would be two of the same turbo generally each feeding half of a given motor.

Yes, sorry I guess I did not clarify. Compound setup. One feeding into the other.


I did a little reading and found that someone said that the K03 and T3 would be an okay match for each other. It is important to note that if no external wastegate is used to bypass the K03 at high flow the egts and emp will skyrocket.

[410]

Are you thinking of something like this?

[R.O.R-2.0]

How would a K26 audi turbo play with a VNT?

like, VNT for the small turbo, and K26 for the big one..

im going twin boost now that i know i have a 12mm block..

[dh13]

Are thinking of something like this?

Something like that!

[410]

I saw your posts in the conversion section at tdiclub.  Your truck looks sweet.  I'm currently building a 1989 toyota for a buddy with a compound turbo setup.  K03 and a k24.  We're waiting for the oil line adapters, couplers and lines to get the mock up done.  We should be dropping the motor in right after Christmas.  We're going for a respectable 26 psi.  This truck will have all the electronics with some custom chips from Malone.  Should work out really well.

[410]

How would a K26 audi turbo play with a VNT?

like, VNT for the small turbo, and K26 for the big one..

im going twin boost now that i know i have a 12mm block..

I'm sure something like this would also work really well.  We were actually thinking of doing something like this with the k24 for the big one and a gt1749va for the vnt but the deal fell through for the vnt.  I would be a little concerned about boost creep with a small vnt but a wastegate to bypass the small turbo would easily take care of this.  The powerstroke 6.4 litre engines had a vnt for the small turbo and a wastegated big turbo so it is definitely doable.

[dh13]

I saw your posts in the conversion section at tdiclub.  Your truck looks sweet.  I'm currently building a 1989 toyota for a buddy with a compound turbo setup.  K03 and a k24.  We're waiting for the oil line adapters, couplers and lines to get the mock up done.  We should be dropping the motor in right after Christmas.  We're going for a respectable 26 psi.  This truck will have all the electronics with some custom chips from Malone.  Should work out really well.

Thanks man. I just got in from the shop. I am installing my remote oil filter assembly. I realized that I forgot to install the downpipe when I set the engine in last time. Good thing I also found out I only have to move the engine ahead about 1.5 inches in order to install it the downpipe, rather than take the entire engine out.

 At this point I am running out of time to do anything about building a compound setup. I am going to run the K03 and just limit the fuel for right now. I might be able to get a standalone vnt controller built during winter term and an adapter from the BHW manifold to the sprinter turbo I have. Or I might go with a compound setup I don't know I will have to see what will happen.

[RabbitJockey]

How would a K26 audi turbo play with a VNT?

like, VNT for the small turbo, and K26 for the big one..

im going twin boost now that i know i have a 12mm block..

I'm sure something like this would also work really well.  We were actually thinking of doing something like this with the k24 for the big one and a gt1749va for the vnt but the deal fell through for the vnt.  I would be a little concerned about boost creep with a small vnt but a wastegate to bypass the small turbo would easily take care of this.  The powerstroke 6.4 litre engines had a vnt for the small turbo and a wastegated big turbo so it is definitely doable.

i haven't read the whole thread so i don't know the whole conversation but a k24 would not be good with a gt1749, k24 is actually a pretty small turbo, and i would imagine that since the vnt15 actually can flow about the same amount of air as the k24 that the vnt17 would actually outflow the k24 by quite a bit, even tho the 17 is physically smaller.  also keep in mind on compound setups, your max power is still limited by how much the larger turbo can flow.

[RabbitJockey]

also a k26 could be good depends on how much it can flow. i would think on a compound setup u'd want a large turbo thats good for atleast 300hp like a t3 60 trim or something

[R.O.R-2.0]

also a k26 could be good depends on how much it can flow. i would think on a compound setup u'd want a large turbo thats good for atleast 300hp like a t3 60 trim or something

so, your saying i should just use my T4?  

im down with that!

the turbos i have at my disposal are a T4, K26 audi quattro, T3 chry 2.2, TD04 chry 2.5, K24 VW diesel turbo, a T2 nissan turbo, and some other random ones..

the K26 or T4 seems like the only turbos that are sized good enough to work with my VNT..

[RabbitJockey]

I don't know enough About it to say what turbos will work best together buying know k24 would make a better small turbo than big. And the sizing of both is really important the small turbo can still be a restriction

[R.O.R-2.0]

I don't know enough About it to say what turbos will work best together buying know k24 would make a better small turbo than big. And the sizing of both is really important the small turbo can still be a restriction

yea, ive always thought that a K24 would be a poor choice for a large turbo in a compound setup.. they just are NOT big enough.

and dont they flow a similar amount of air as a VNT?

[410]

Once this setup is up and running I'll post my impressions.  I think it will work out quite nicely.