Owens development turbo project Octavia vRS.....

BenS1

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Jun 26, 2001
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From what I've read on here it seems like there simply isn't a reliable big turbo solution. It seems that every turbo that has been tried has failed.

Maybe people are just pushing the turbos too hard? For example, if the PE1820 failed at 395bhp wouldn't it have been nice an reliable at say 360bhp?

I certainly like the idea of building my engine for over 500bhp and getting a turbo good for 450+bhp but only running it at 425bhp to give a bit more reliability.... although I appreciate that there will be other problems (Drivetrain, gearbox etc).

Maybe I will stay with my current setup and just buy another engine if this one pops.

For now I'm stripping out the interior. If I can get the car down to 1000Kg then thats a 10% increase in the power to weight ratio for free. :)
 

ibizacupra

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Jul 25, 2001
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From what I've read on here it seems like there simply isn't a reliable big turbo solution. It seems that every turbo that has been tried has failed.

Maybe people are just pushing the turbos too hard? For example, if the PE1820 failed at 395bhp wouldn't it have been nice an reliable at say 360bhp?

I certainly like the idea of building my engine for over 500bhp and getting a turbo good for 450+bhp but only running it at 425bhp to give a bit more reliability.... although I appreciate that there will be other problems (Drivetrain, gearbox etc).

Maybe I will stay with my current setup and just buy another engine if this one pops.

For now I'm stripping out the interior. If I can get the car down to 1000Kg then thats a 10% increase in the power to weight ratio for free. :)

Pe1820 itself did'nt fail tho.. its housing warped which to me is'nt a failure like bearing/seal would be. and its an IHI thing! thats what they do when you push em hard and EGT's get hot. their hotsides are just not very good materials relative to other manufacturers like FP's GReddy housings in IHI/mitsi hybrids - FP Green/FP Red being 2 that I have run successfully, just moved on to bigger and different things now.

bearing failure is th eone thing I have'nt experienced.. warped housings for sure when IHI'd, never since I moved onto other makes & better manifold designs
 

caney

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Apr 24, 2005
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So the TD05H 18G is good and reliable for about 400bhp?

Is it a straight swap or does it require a different manifold?

Thanks
Ben
iirc it's a straight swap but the turbo is only good for 360/370bhp.
 
Apr 28, 2003
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So about the same as a standard IHI then?

I think the point is Ben if you had ran an 18g on your car when it made 361bhp at Jabba with the vf34 .20, the 18g on Jabbas old rollers would have made 385-400bhp.

I reckon my car on jabbas new rollers with a vf34 .18 would likely only see 320-325bhp. Really when IHI was concieved I believe it should have been 18g or Pe1820f based if it was to be a real world 350bhp conversion for me the vf34 is a 320-330bhp turbo.
 

Wilko

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I think the point is Ben if you had ran an 18g on your car when it made 361bhp at Jabba with the vf34 .20, the 18g on Jabbas old rollers would have made 385-400bhp.

I reckon my car on jabbas new rollers with a vf34 .18 would likely only see 320-325bhp. Really when IHI was concieved I believe it should have been 18g or Pe1820f based if it was to be a real world 350bhp conversion for me the vf34 is a 320-330bhp turbo.

Spot on. The vf34 made 325-330 on awesome dynojet verses 360-365 for the 18g. The vf34 is a 330hp turbo max. The 18g is good for 360+

By the way the owens 475 unit is laggy as, 1 bar by 4400, but fully spooled (30lb) by low 5's and holds 28lb at 7800rpm on a big port with cams

Massively faster than the vf34 or 18g, but it's bloomin dangerous in a 1350kg golf, so in an ibeza you'd die fairly soon.
 

str8ballin

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Feb 27, 2007
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Spot on. The vf34 made 325-330 on awesome dynojet verses 360-365 for the 18g. The vf34 is a 330hp turbo max. The 18g is good for 360+

By the way the owens 475 unit is laggy as, 1 bar by 4400, but fully spooled (30lb) by low 5's and holds 28lb at 7800rpm on a big port with cams

Massively faster than the vf34 or 18g, but it's bloomin dangerous in a 1350kg golf, so in an ibeza you'd die fairly soon.

Hi Wilko, your owens 475 making 1bar @ 4400rpm, what gear was that in?
 

ibizacupra

Jack-RIP my little Friend
Jul 25, 2001
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Spot on. The vf34 made 325-330 on awesome dynojet verses 360-365 for the 18g. The vf34 is a 330hp turbo max. The 18g is good for 360+

By the way the owens 475 unit is laggy as, 1 bar by 4400, but fully spooled (30lb) by low 5's and holds 28lb at 7800rpm on a big port with cams

Massively faster than the vf34 or 18g, but it's bloomin dangerous in a 1350kg golf, so in an ibeza you'd die fairly soon.


LOL - loons need only apply then eh?
:funk:

GT35 baby :funk: :help:

I'll see what and where mine spools tomorrow when it returns to the dyno.
Running the new Fluid Damper Crank pulley now also, so high rpm harmonics should be dealt with.
 

Wilko

Badge snob
well logged 356g/s through the maf this morning, at 7000rpm, and at this is was holding 22 deg btdc with no cfs.
Should have it mapped this week, so may see a bit more, and should certainly see more timing.

It is, to be honest, undriveable in anything below forth which doesn't hit boost until 75mph. It will drop out of boost if you change up at the limiter in 1st to second, unless you flat shift. In the right gear on a dual carriageway playing with a big bike it's going to be funny, but it'd not a very good fast road car.
Unless you are in exactly the right gear, it will get walked on by a diesel mondeo.

I'm sure riding a big bike probably feels a bit like this does in boost.

Second gear spins drag radials to the limiter on grippy tarmac in warm weather. This is with a diff. Third is weaving trying to find traction.

I really wouldn't do this unless you have something like my daily driver to fall back on for normal, quick driving.

Would I do it again?
Probably!
But then I'm an idiot.


How the hell bills will cope with a gt35 in a striped ibeza, god only knows.
I'm convinced gt 3071 on something like the pag parts mani is the way to go on the 1.8t.
 
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BenS1

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Jun 26, 2001
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Spot on. The vf34 made 325-330 on awesome dynojet verses 360-365 for the 18g. The vf34 is a 330hp turbo max. The 18g is good for 360+

By the way the owens 475 unit is laggy as, 1 bar by 4400, but fully spooled (30lb) by low 5's and holds 28lb at 7800rpm on a big port with cams

Massively faster than the vf34 or 18g, but it's bloomin dangerous in a 1350kg golf, so in an ibeza you'd die fairly soon.

I'm not saying you're wrong about the IHI's power, but the thing is, I'm getting mixed messages....

One minute I'm being told that Owen Developments know what they are doing and that their power claims are accurate, but then when I point out the Owen claim the VF34 P20 is good for 370bhp I'm then told that the IHI is only good for 330bhp.

Also Wilko, if you're basing the 320-330bhp on your car, remember that we both went to the same rolling road day (Where was that???) and mine produced exactly 360bhp whilst yours produced something like 325bhp (I think).... so it appears mine really was producing about 30-35bhp more than yours (Thats if my memory is correct.).

I still don't get how rollers can give too high readings.... especially inertia rollers. The maths is quite simple, so unless someone has the mass of the rollers wrong they should give a reading that's either accurate or too low, but never too high (I'm talking at the wheels here, not the flywheel).

Don't get me wrong, I'm not disagreeing with anyone, I'm just trying to understand it for myself.

Thanks
Ben
 

Wilko

Badge snob
Ben
that was at stealth, and I did 26x on an e05 that day
maxed their rollers on ihi.
Most UK Subaru tuners rate the vf34 at 320-330hp
mine shifted 250g/s max, and the Owens unit is doing 356 g/s so 40% more power.

Rollers vary massively in wheel and flywheel figures but on ihi I made 320hp repeatedly on many dynos
made 36x on 3 different dynos on 18g.

On one 2 day dyno event at pooperchips 3 different vf34 from 3 different mappers, one being is made 295-310 up. My 18g made 367.

Please take your car to a dd or to awesome. If it makes more than 335hp, I'll pay for the run
 

ryan_s3

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Mar 27, 2004
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off topic - Ryan, I had a short drive in an EVO VII today that came in for brake bleed. (was empty of fluid after caliper change.. log job.. anyhows.. nice car. handling and turn in was lovely.. no wonder I have problems keeping up with the ones @ combe lol.. well sorted out of the box.
everything felt light too.. doors were light, boot, bonnet.. how much do these weigh?

Evo VII is 1400kg if it's a gsr,rs is 1320kg.
Mine is about 1300kg.
 

ryan_s3

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Mar 27, 2004
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Everything your saying wilko is spot on bud.The owens 475 hybrid won't make much more than 425bhp bud or 360atw 2wd on dd,that is more than enough 2wd!
I reckon it will be 425atw at awesome.
I was talking to a guy at pod on sunday claimng 625bhp at 2 bar on a gt30! I'll give you one guess where it was dyno'd ;)
 
Apr 28, 2003
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see post 31 ;)

See 2006 LOL :p

09-02-2006, 08:22 #678
Madmile
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Join Date: Apr 2003
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Posts: 2,951 Gt3071r is a nice turbo supposedly using a 46lbs compressor wheel. The Gt30 is supposedly a 49lbs compressor wheel. To keep an internal wg and help with general fitment there are other options the Avo450 using the smallest of the garrett 30 wheels/ 44lbs comp wheel. The Avo 500 is a 51lb comp wheel. The Avo range are BB and all with a IHI based fitment. I would think a Avo450 would be a 430bhp turbo with supporting mods and not killing itself it is supposedly a 450bhp turbo anyway. Lag should be kept to a min using the 44lb comp wheel and BB. I would think a Pe1820 is in the 40-42lb comp wheel stakes. But its still a IHI based wheel the Avo is a Garrett wheel.

PE 1820 600 CFM at 22 PSI
AVO 450HP 650 CFM at 20.0 PSI
GT-30 790 CFM at 22 PSI

It looks like the Avo450 is inbetween the Pe and Gt30.





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