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IHI VF34 or GT28RS??

Mark@VAGWORX

SEat Regular
May 15, 2003
401
0
Nr Colchester, Essex
I'm going to be swopping out my charged VR lump for a 1.8T over the next few months.

Car is Mk3 Golf VR6.

I'm looking on advice for the best route to go when chosing the turbo.

I'll be using an AUQ head and AUM bottom end with DTA managament.

I'm looking for a sustainable 330-350hp. Which of the 2 turbos listed above would be the better option for the figures i want to achieve??

Any help and thoughts would be greatly appreciated.

Thanks
 

ibizacupra

Jack-RIP my little Friend
Jul 25, 2001
31,333
19
glos.uk
either IMHO will get you those figures.
garrett has more spare's availability.

depends on how hard you want to push them respectively...
IHI exhaust housings are not so good at high temps, moving/warping/cracking. You would'nt want to see sustained EGT's much over 900'C - I have several dead ones around me to confirm this.

Some VF units have suffered bearing failures, which is end of turbo. All down to how hard you run them. Keep em to sensible 1.2-1.3bar boost and 300-320bhp and they should go for many 1000's mile problem free. Get the urge to run em higher and.... well you eat into their reliability margin in my experience. (exhaust housings in particular)

I would imagine a VF34 could outspool a GT28RS slightly, as its a lower inertia contruction. It loves to produces shed loads of boost, which can be its demise.

Jabba are IHI kings in experience terms, and also moving onto mitsubishi TD series these days also... JBS do garretts and IHI. 6 of one 1/2 dozen of the other.

I had good service from my original VF34/18 on 1.2bar boost. I then grew horns and wanted more and more.. flogging the poor thing harder & harder, to the point things melted on occasion. :doh:

Changing out the VR for a 1.8t tho? why?
 

Mark@VAGWORX

SEat Regular
May 15, 2003
401
0
Nr Colchester, Essex
ibizacupra said:
either IMHO will get you those figures.
garrett has more spare's availability.

depends on how hard you want to push them respectively...
IHI exhaust housings are not so good at high temps, moving/warping/cracking. You would'nt want to see sustained EGT's much over 900'C - I have several dead ones around me to confirm this.

Some VF units have suffered bearing failures, which is end of turbo. All down to how hard you run them. Keep em to sensible 1.2-1.3bar boost and 300-320bhp and they should go for many 1000's mile problem free. Get the urge to run em higher and.... well you eat into their reliability margin in my experience. (exhaust housings in particular)

I would imagine a VF34 could outspool a GT28RS slightly, as its a lower inertia contruction. It loves to produces shed loads of boost, which can be its demise.

Jabba are IHI kings in experience terms, and also moving onto mitsubishi TD series these days also... JBS do garretts and IHI. 6 of one 1/2 dozen of the other.

I had good service from my original VF34/18 on 1.2bar boost. I then grew horns and wanted more and more.. flogging the poor thing harder & harder, to the point things melted on occasion. :doh:

Changing out the VR for a 1.8t tho? why?
Click to expand...

Thanks for the reply Bill.

So, the GT28Rs looks the better option for me then. I would probably want to run nearer the 340hp mark if i could and if that's going to push the VF too hard then i may have to let that option go.

Next option is whether to use the eliminator setup on a K series manifold, or go for a T3 flanged RS and use a tubular manifold. I like the T3 option better to be honest, and i'm also assuming that a much better rate of flow is achievable.

Swopping the VR out......why? Old technology now i guess, and i want more hp!
 

ibizacupra

Jack-RIP my little Friend
Jul 25, 2001
31,333
19
glos.uk
CupraT said:
Thanks for the reply Bill.

So, the GT28Rs looks the better option for me then. I would probably want to run nearer the 340hp mark if i could and if that's going to push the VF too hard then i may have to let that option go.

Next option is whether to use the eliminator setup on a K series manifold, or go for a T3 flanged RS and use a tubular manifold. I like the T3 option better to be honest, and i'm also assuming that a much better rate of flow is achievable.

Swopping the VR out......why? Old technology now i guess, and i want more hp!
Click to expand...

not talking you out of VF34 as its a good unit within limts, same as Garrett within limits.. They too blow up when pushed too hard..

There are guys on here, I was one of them previously, who ran 1.5 bar to 1.6bar on the VF34, got 340+bhp out of them with similar torque etc... Sustained hard use like mine has on track and the extra being asked of them can take its toll on housings from heat. You dont hear of garrett housings warping over on vortex, or the few in the uk who are running them. I suspect their exhaust housings are rated higher temps.

I have yet to see back to back GT28Rs/IHI VF34 on the same dyno same day, same spec engine.... ut I doubt there would be much in it, with perhaps slightly faster spool from the VF34.


Why not turbo the VR?
proper power!
 

Mark@VAGWORX

SEat Regular
May 15, 2003
401
0
Nr Colchester, Essex
ibizacupra said:
not talking you out of VF34 as its a good unit within limts, same as Garrett within limits.. They too blow up when pushed too hard..

There are guys on here, I was one of them previously, who ran 1.5 bar to 1.6bar on the VF34, got 340+bhp out of them with similar torque etc... Sustained hard use like mine has on track and the extra being asked of them can take its toll on housings from heat. You dont hear of garrett housings warping over on vortex, or the few in the uk who are running them. I suspect their exhaust housings are rated higher temps.

I have yet to see back to back GT28Rs/IHI VF34 on the same dyno same day, same spec engine.... ut I doubt there would be much in it, with perhaps slightly faster spool from the VF34.


Why not turbo the VR?
proper power!
Click to expand...

Cool, bit of an unknown still the 28RS on the 1.8t overhere i guess.

Did think about turboing the VR, but it would have cost a fortune to do it properly, and they're not that reliable.
 

andythom

Apr 12, 2005
1,561
1
Kilsyth, Glasgow
www.sma-group.com
CupraT said:
Cool, bit of an unknown still the 28RS on the 1.8t overhere i guess.

Did think about turboing the VR, but it would have cost a fortune to do it properly, and they're not that reliable.
Click to expand...

Seen this at tatton park at the weekend and spotted this thread :)

might lure you to turbo the VR :)

DSC02799.jpg
 
beattie17

beattie17

Full Member
Apr 12, 2005
1,353
0
Perth
Wooo wondered what you were upto,thought u had another car lined up,but changing lumps instead.
Ive heard good things about gt28rs!
 

Mark@VAGWORX

SEat Regular
May 15, 2003
401
0
Nr Colchester, Essex
ibizacupra said:
GT30R is worth considering also, with 0.63 a/r
Click to expand...

I plan to leave the internals stock Bill.

Will the 30R not put to great a strain on it? The car is a daily driver.

What sort of trim would be a suitable compromise between spool and high end power on the 28RS?
 

thechief

Guest
As the engine would already be out of the car I would really think about adding in some Scat rods and pistons if needed. Maybe even an overbore as machine work is usually cheap.
 
EddyH

EddyH

Full Member
Aug 9, 2002
263
0
Pontefract
Visit site
CupraT said:
I plan to leave the internals stock Bill.

Will the 30R not put to great a strain on it? The car is a daily driver.

What sort of trim would be a suitable compromise between spool and high end power on the 28RS?
Click to expand...

I have a GT30R as a daily driver. Even with the GT28RS unless you are running low boost I think you will need to uprate the internals, same goes for IHI.
 

ibizacupra

Jack-RIP my little Friend
Jul 25, 2001
31,333
19
glos.uk
well I did >35K miles on stock bottom end on my ibiza AYP motor with 1.6bar boost, zero rod problems ever.

I would'nt risk this on a 19mm pin rod tho

1.2-1.3 bar with no det and the stock rods seem to cope ok.... but forged rods will bring peace of mind.
 
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