Compound turbo or Bi-turbo set ups

[Smokey Eddy]

I know that the flanges are totally different on my manifold and on that of the holset.
Any suggestions on how to mount the holset?
Should i try and make runners and have a totally custom exhaust manifold?

[Rabbit on Roids]

good luck spooling that beast!!
5 stages of nitrous should do it...one for each gear.....haha



BTW comparing to a gas Civic isnt fair...those little bugger have lots of RPM's it get that turbo wheels spinning.

post your progress as you go ed!

im with lucas on this one. if you have a t3 as the SMALL turbo, you aint gonna have squat for low end power. cause a T3 is still a pretty big turbo for these cars. and an HX 35 is HUGE compared to your T3. that HX turbo might start spooling at around 4500-5000 rpms. or just go with the 5 stages of LOL.

and Ed, as for them using them on civics, yea, its possible. its possible to run alot more turbo on those engines. they spin 10000 rpms, not 5000. they will be moving roughly twice the air our diesels are moving. they have SUPER EFFICIENT 16 valve heads on them. and they dont spool an HX 35 till 4500 either. the only hondas you see with holsets this big is straight drag cars.

[drrtybyl]

maybe find a different turbo to spool the hoslet?

[Rabbit on Roids]

maybe find a different turbo to spool the hoslet?

thats the only viable option i see here.

[Kantdrivefast]

maybe find a different turbo to spool the hoslet?

Why not find a smaller turbo to boost at super low rpms then find one a tad larger than the t3

[Smokey Eddy]

Well the whole idea was because i got the holset for free.
If you guys think it's totally impossible then I won't bother. I don't want to spend like 30 hours making manifolds and runners and adding an oil line + return only to find the turbo wont make any pressure because its so large.

[truckinwagen]

like I said, send it to me


you could probably get it to spool, but you will need a smaller high pressure turbo if you want it to be drivable at all.

[Smokey Eddy]

Your idea looks a bit too bluky for the this head (IDI) its tight enough to use 1 o-ring!Also if you look at the pics of my head you would see that we had to machine around the prechambers which could not work with your idea but Your idea would work on a TDI.
Part of the issue with sealing the head to block is due to using a turbo(s)  that are not proprely sized which leads to high  turbine inlet pressure preventing the exhaust from leaving the cylinders thus increasing cylinder pressures and raising combustion temps also.

The hybrid hx30/hy35 still won't cut it with 29 psi boost/32psi drive pressure and EGT's pegged the whole time.I'll be putting an hx35 compressor onto the hx30 turbine next hoping that is will raise boost and equalize drive psi/boost pressure,Any thoughts?

[Smokey Eddy]

This link has tons of insight
http://www.vwdiesel.net/forum/index.php?topic=2538.285

[Smokey Eddy]

Sounds like the HX will just barely work. Some guys run them by them selves on TDI's. They just had to extensively port the exhaust ports and manifold.
I'm prepared to port the ports more than i already have and make a header for the Holset if need be.

[Smokey Eddy]

After doing some reading i've decided that going for just outrageous power numbers isn't work it. You just end up destroying the head.
Almost all the compound IDI's warped their heads. The head studs hold it down where they are but the head lifts between the studs.
Andy2 and Devistator said you would need a steel or cast iron head to make more than 200hp on an IDI. The same issue apparently happens with TDI's.

Citations:

The head is just not up to the challenge for these high hp IDI's.The coolant ports and pre chamber are the week spots.We would need 6 head bolts per cylinder to have any hope of keeping the aluminum from flexing.

All 4 cylinders are leaking so an intake manifold will not fix that.

Daves setup is completely different to mine his engine has smaller pistions (1.6) and has a big single turbo making much lower torque and HP than my setup.With the compound turbos my engine produces lots air flow at lower rpm and having bigger pistons ony helps push the head off.

The last dyno 2 years ago my engine produced 161 whp @ 4250 and 225 torque @ 4000 on only 30 psi and 86cc's fueling and no head or gasket issues.

Now The fueling is 120cc's boost is 50 psi the engine now pulled well past 4500 RPM you do the math?

Sad day for IDI, two of the big ($$$$ and Time, R&D) motor's are dead, and will not be revived. In the light of this I'm putting a celling on IDI power at about 200hp. Both of these cars produced ~200hp but neither could live for any length of time with it.

So for everyone pushing for a powerful, reliable, IDI I would call it quits at about 170. If you are down for the $$$$ and time it takes to push the limit, absolutely I applaud your effort.

[Smokey Eddy]

I'll be very happy if my jetta will make Andy2's 161 whp @ 4250 and 225 torque.

[Rabbit on Roids]

the HX 30 is the one you want with the 6cm turbine housing, not the 35, my bad. either way, you are gonna have a gutless wonder daily driver. and then once you get that big holset to light, the transmission is gonna say "oh HELL NO!!"

if the turbo ever spools, its gonna be like getting hit in the back with a baseball batt.

and yes, the heads actually bend. there are not enough bolts holding them to the block, if there were more bolts in the head, we wouldnt need cast iron heads.

[gnavs]

Are cast iron heads even a viable option at this point?  I'm assuming big money is involved.

[truckinwagen]

iron heads are definitely possible, but due to the scale of production they would likely have to be cast and machined by hand, which is a very costly process unless you have the means to do so yourself.

I would love to get ahold of an iron head for one of these motors, but realistically never will.