The HOLSET Thread

Looking to put a single on my 2jz

F con v pro 3.2
Japspeed manifold
Sard 650cc injectors
Turbosmart 45mm wastegate with a 14psi Spring
And

A Holset he351 12cm

Looking to get to 550bhp wit full boost by 3000 rpm

Is this set up gonna do that business ?

Is there a better option than a he351 for this (hx35) or ... Anything else
Nothing bought yet so it's now I want opinions on this

Has anyone access to dyno graphs of 2jzs running small holsets like listed above
 
Pretty much what you're after dude
McFarlo said:
Some results from mine being mapped earlier this week on a holset.
Figures are using 1.7 Bar boost
Rough spec is as follows:

Holset HX40 w/ 12cm HX35 Turbine housing/wheel - rebuilt with 62mm inducer, 86mm exducer, 90mm tip billet comp wheel
1.5JZ 9.something to 1 compression using 97RON fuel (it's the most we can get in NI)
Sinco T3 twinscroll manifold
Full 4" exhaust from turbo to backbox, no cats no resonators - quite loud
Turbosmart 45mm gate (VTA)
SSI Inlet manifold w/ 90mm throttle body
ID1000's
Walbro 450, -8 feeds etc
BC272 cams, single springs w/ ti retainers
3" IC piping w/ 4" thick IC core

Really happy with how it drives, no drop-off at high rpm whatsoever like the oem turbos, full boost is around 3500, with plenty of torque pretty much everywhere too. Exactly what I wanted from the build, very pleased with how it performs!

View attachment 266266
Click to expand...
 
Hey mates

i need an advice from you. :wave:
At first here is my setup:

-2JZ-GE VVTI
-OEM GTE pistons
-Eagle rods
-OEM GTE head gasket
-272 BC cams + springs/ retainers
-head was milled 0.09mm (i think?)
-diy custom T4 turbo log manifold
-ARP head studs
-ARP main studs
-engine girdle kit
-complete rebuilt/ honed etc.

At the moment i have sitting a HX60 here but i´m not sure if i should step down a little bit. :/
I also have a HY35 9cm with a 56mm inducer here.

Now i saw that some guys are running "small" turbos with large 272 cams and it looks that they are good setups.
I´m not sure if it´s not better if i step down too so i can drive the car in the next few weeks.

Do you guys think that the HY35 will be too small? :wack:
I didn´t find any infos about 56mm single turbos on 2JZ´s tho...

Thanks for you help guys.
 
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I think an HY35 might be a bit too much on the small side for a 2JZ.

an HX60 would be wild though!

Is there no chance that you could go for something between the two?

I would think that the HY35 would just be strangling the 3.0 up top, with the 9cm turbine turbine housing. If im thinking correctly, it would also need some form of adaptor to go from the T3 flange to your T4 manifold.

an 11CM or 13CM HX52 would be a good option for you I think - small enough turbine to be somewhat responsive on a 2J, with a big enough compressor to flow what you'd want - especially with the 272 cams. They're "T4" too (or at least they fit a T4 manifold with minimal modification) so it would maybe be an easier route?
 
Wow some thread I’ve just read lol

Looking for some 1st hand knowledge please.

I’ve a HX35 7 blade with 16cm housing, full twinscroll manifold on my M54B30 BMW E46.

What kind of PSI can I run without over working this turbo ? Engine is fully forged with RACEWEAR studs ?

Cheers guys

5523B0A3-CD61-4B7B-98BB-B7CFA5F43724.jpeg


02CC095B-AD8C-4F20-ADD7-6E901D6561B6.jpeg
 
What PSI do you want to run?
Do you have a goal in mind?

Normally see HX35's really start to come alive after ~25psi. I think in the OEM application they run between 30 and 40psi.

I have read of a few running above 40psi in the states, on 5.9 cummins engines.

Hope this helps.
 
Well to be honest I’m having an issue, beleive it’s too much pressure pre turbine, the 16cm twin scroll housing isn’t big enough, I should have done more research to be honest but I’m a bit stuck now as can’t fit a bigger turbo in the space I have.

Was aiming for 24-25psi but seems to be choking at higher RPM’s
 
Hm, well it’s 3” downpipe and full system.

The wastegate has a large surface area, which isn’t helping the matter as it gets forced open.

Can’t think what else it could be ? Have pressure test the full intake from mouth of turbo at 10psi no leaks there.
 
Andy318ti said:
Are you sure it's choking or is it pushing the gate open?
Click to expand...

Well no, it is pushing the gate open, and on a bench test to make the valve crack it takes 36psi.

So in real life application with vacuum and then pressure applied to the face of the valve I’m guessing on it being around 22psi spring.

I’m open to suggestions, I have a stiffer spring set up that opens at 42psi on the bench, but these numbers seem very high to me ?
 
Do you Have a boost controller of any kind? Also why test the boost pipes only to 10 PSI of you intend to run 25?
 
thebe said:
Do you Have a boost controller of any kind? Also why test the boost pipes only to 10 PSI of you intend to run 25?
Click to expand...

That’s a very good point, I only tested to 10psi as only had 1 clip large enough and the test rig would pop off at anything over that, I’m actually in the garage now with another clip the right size and going to test to 20psi.

I have an AEM TRUEBOOST controller, what I’ve found is by increasing the duty cycle in turn the spike increases also, and obviously I don’t want to break this engine as it’s still in the mapping process.

Using softer springs and increasing the duty cycle I found boost still dropping off in the higher RPM range as the WG was getting forced open.

The controller is installed correctly and the wastegate has no leaks in the top and a slight leak in the bottom from the bush the valve goes through, this leak is only present when parts are cold, once upto operating temps it is almost completely sealed.
 
Andy318ti said:
Is it a genuine gate?
Click to expand...

Nope, HKS KNOCKOFF, I’ve had it apart a number of times, fixed all the wanky leaks, apart from the valve stem bush, but as said when it’s hot it barely leaks.

And just a note for anyone else reading this, pay out for a genuine WG, will save you a load of headaches.
 
I'd doubt a 16cm twin scroll housing is choking on a 2.5 unless the exhaust is really restrictive but you've said it's not (would benefit from 4" but nearly impossible on a rhd bmw).
Does the gate plumb back into the downpipe?
 
I bought one from compressor racing eBay about 1,5 years ago but dont think Ive seen another one for sale since. They seem quite rare
 
Andy318ti said:
I'd doubt a 16cm twin scroll housing is choking on a 2.5 unless the exhaust is really restrictive but you've said it's not (would benefit from 4" but nearly impossible on a rhd bmw).
Does the gate plumb back into the downpipe?
Click to expand...

It’s a M54B30 so a 3.0ltr engine. Of you look at pictures I posted you can see how the WG is plumbed back into the 3” downpipe, and yes a 4” just isn’t really possible.
 
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