Made this little mod up over the last few weeks, will road test and map tomorrow to see how it performs.

 

Air to Water intercooler ??

 

Aye yep, that bit works, need to see if the turbo does
New turbo beside 16g

 

V. Nice!! I did look at the Charge cooler route but decided against it. . .flipping heck that thing is a windmill!!

 

Great work, feels good when its built by yourself.

 

Well done, is that a hx35

 

Top work! Looking forward to see the results.

 

Holy mother! Lovely work as always boosted. Can't wait to see the results.

 

Very nice work,looks mint.
Be interesting to see results

 

Holset HY35, smaller turbine wheel over the hx.
Still a 500hp turbo.

 

This is great, I've always wondered about going rotated but keeping the tmic.

 

Intercooler is difficult to keep due to its size and heat soak issues, this chargcooler is a better fit though.
Although it does need the bigger engjne I have sitting as I'm not seeing full boost until 5000rpm.

 

5000rpm?!?!?!

Is that right? Even with the shortest pipework I have ever seen? When you say it is a 500hp turbo, do you mean 500whp (so nearly 600fhp?)

it looks absolutely fantastic mate, a real credit to you, I would love to be able to do something like this.

 

Yeah remember it's a non avcs 2.0, full boost 1.7 bar by 5000rpm isn't so bad.
Boost pipe work has nothing to do with what rpm it makes boost, just response time during gear changes etc.
Should see 1.5 bar by 4500rpm with the 2.5 engine, which is good.

 

That's good?!?! Even on my 2.1 with standard heads I was doing 500hp with full boost before 4k....

 

What turbo? Gt3076?

 

T38 hybrid turbo technics s206.

That was non billet too. On my new engine with avcs and all the kit, 0.5bar is in at 3k and 2bar by 3.7ish. To be honest it's hard to tell as I'm usually holding on for dear life by then.

That seems monstrously laggy, on a 2.0 that's like 2k of usable power. It must be horrendous to drive? Is it standard exhaust manifolds etc?

 

Std manifolds just now, I have ported ones ready to fit with the 2.5.

 

Ported will struggle at over 500. You would gain some by making decent manifolds.

Not buying rcm rubbish

 

Only looking for 430-440 hp

 

If that's your target is the turbo just not far too large?

 

It's a 450-500 hp turbo, I think it's sized well for 440hp? Especially on the bigger engine.
What other turbo would you recommend for £260 that will do 440bhp?

 

Sounds like it's better suited to the upper end of the scale then for 500bhp applications. As you say, it may work better on a 2.5 lump rather than a 2.0L engine. For that price it's excellent value for money I agree, but is certainly compromising your power delivery being slightly too big I'd say.


Just looking at the pics again, it's quite comical how big this is against the 16G turbo. No wonder full power is so high up the rpm range. lol


I love it! Great engineering though, top work as always.

 

These big holset units will not spool as well as a Garrett turbo of similar size because they are designed for use on big displacement diesel engines. Internally gated, big AR turbine housing and Lack of billet wheel is all against it. They are cheap, very reliable and do what they are designed to do.
What size up pipe are you using?

 

Mitsubishi guys are getting 2 bar by about 4000rpm with these. Maybe my engines just a bad spooler, compression, cam timing, who knows? It does spool better with the Dawes fitted, think it was wastegate creeping a bit. Not needing that open!

 

The big Garrett's are off diesels too? Billet wheel thing is rubbish, I data logged my 16g back to back after changing the wheel to billet, it was actually slightly laggier by 100rpm or so on the same setup.
This is only a 9cm exhaust about .65AR, not that big.
Internal gate or external will make no difference to spool? Only problem is if the gate is too small it will boost creep up the revs, this doesn't.
My uppipe is 1.5" bore, I searched all over for definitive sizes re BHP requirements to no avail. Is it too small for it?
Regards boosted

 

Up pipe and exhaust manifolds are clever things (I'm not saying you aren't clever) places like rcm etc think bigger is better. And it doesn't work.

I think my up pipe is 1.25" iirc. But the whole design makes it flow better, spool faster etc.

I'd say the standard cast manifold is part of the issue

 

On a side note I had a similar turbo (same compressor but slightly bigger turbine wheel, same AR) on my 2.0 16v golf, with 8:1 compression I was getting 2.0 bar boost by 4300rpm, I think it will take the 2.5 to get somewhere near this spool time.
Anyway who needs full boost at 3600rpm!?!? The engine can't do much with it!

 

My car is Jacked up and coolant draining....
2.5 going in the morn, along with ported headers.
By my calculations the 1.5" up pipe is 12cm squared in section, mated to a 9cm squared turbo seems well matched? 1.25" is 10cm squared, not sure if this would create too much heat and restrictive pre turbo?
Rcm is about 2"!!

 

RCM is way oversized. I improved my spool, power throughout the Rev range etc.

It's all about exhaust gas velocity