If I ever wanted to replace the turbo on my 4x4 there seems to be a lot of these about (and much cheaper that Garretts) but which ones can we use on the 1.8 and what bits need changing? Also what would need changing on the rest of the car? gearbox, clutch, etc?

If I wanted to keep the appearance stock what intercooler options are there? thought about using the 2nd IC from an S4? or an upgraded Alloy side mount but not sure what would be best.

I know Big Turbo is an expensive road to go down but as the car is a keeper, if I just change bits as they break I will get there one day.

Edited 1 May, 200917 yr by karlbar2k

there is anothere thread on here mate about thes beasties

have a look there. there is some threads on what ppl have done

billy

Here you are mate:

http://briskoda.net/octavia-i/holset-turbo-vrs/123381/

If you want any info on the turbos let me know and I'll try and help out. I'd imagine an HX35 would be a beast!

Just gotta choose your compressor and turbine wheel sizes carefully.

i can't see if being worthwhile though really as although the turbo's might be cheaper everything else will be bespoke and probably more expensive, not to mention the fact that they aren't ballraced or anything like that so they are cheaper for a reason.

They do indeed have plain bearings. But there is absolutely nothing wrong with plain bearings.

The minimal benefits of using ball-bearings (slightly better turbo response), are far outweighed by their massive cost and lower reliabilty.

I mean if your running a dragster, then fair enough. But if you want a reliable unit for daily use and long life, then plain bearings are the way.

minimal benefits? other than "slightly" better turbo response(potentially 1000rpm), they can both hold higher boost and for longer resulting in much higher power and they are actually more reliable.

just been googling holset turbo's and they are rubbish!!

some american running an hx35 made 340bhp and 308lbft but it didn't make peak torque until 5,000rpm!! and at 4,000rpm it was only making 170lbft and at 3,000rpm it was only 125lbft!!

minimal benefits? other than "slightly" better turbo response(potentially 1000rpm), they can both hold higher boost and for longer resulting in much higher power and they are actually more reliable.

Garrett claim a 15% increase in turbo response, so 15% of naff all!

What do you mean by "potentially 1000rpm"? The BB's won't make the turbo spin faster, or let the engine rev higher. We're talking about rotational acceleration. They just reduce the time taken for the turbo to spin up (lag).

BB's will also not allow a turbo to achieve a higher pressure ratio, or hold it for longer, that's down to the matching of the comp and turbine ends against the running line of the engine. The HX35 unit's that the guys are using in the US are straight off big diesel engines, so are clearly not going to be matched to a 1.8 petrol engine. You need to select the right components to get what you want.

I can also say that they are definately not more reliable. We test a lot of units, and the cartridge bearing system is a definate weak point.

Bodge,

do you work at huddersfield lol?

take it you know your stuff?

cant you just get another compressor to go on the other end of the K03s exhaust bit?

billy

To fit a new wheel you would need the housing ground out Billy.

You could get a Hybrid K03s which would be effectively be a k04.

what sort of money would that be then to get my K03s made a hybrid? and would it be good for 250bhp+

just thinkin now as I dont really want to go too big on bhp.

mind I am happy for now with the small amount I got lol

Garrett claim a 15% increase in turbo response, so 15% of naff all!

What do you mean by "potentially 1000rpm"? The BB's won't make the turbo spin faster, or let the engine rev higher. We're talking about rotational acceleration. They just reduce the time taken for the turbo to spin up (lag).

BB's will also not allow a turbo to achieve a higher pressure ratio, or hold it for longer, that's down to the matching of the comp and turbine ends against the running line of the engine. The HX35 unit's that the guys are using in the US are straight off big diesel engines, so are clearly not going to be matched to a 1.8 petrol engine. You need to select the right components to get what you want.

I can also say that they are definately not more reliable. We test a lot of units, and the cartridge bearing system is a definate weak point.

as in spooling upto 1000rpm sooner in the rev, obviously a different turbo isn't going to make a f**king engine rev higher is it.

and i know what lag is thanks

and yes BB turbo's are able to hold higher boost pressures for longer and also they can cope with higher spin speeds.

now now.

this sounds like its gettin a bit nasty.

I dont know much about them but from what I have seen, the garrett i think it is that Delcac has is now worn and is usin lots of oil.

would this happen with the std turbo? or is it jus that delcacs has been well used?

billy

my replies aren't meant nasty btw, its just the ways i talks like.

tbh des's car can never be used as a yard stick as its gets neither built nor treated like a normal car

Bodge don't you work for a turbo manufacturing company?

You've got to bare in mind, if Bengie doesn't have it ain't worth getting

exactly

but if he does work for a company that knows everything there is to know about turbo's why would he quote garrett

I think that you will find that there was IRONY in his reply quoting Garrett

Bodge don't you work for a turbo manufacturing company?

and? despite the company I work for, I know **** all about spuds...

and? despite the company I work for, I know **** all about spuds...

Maybe you need re-training lol

He He dont hold back Mart get straight to the point mate

Maybe you need re-training lol

maybe my job doesn't require me to know about the new and wonderful storage methods "we" are researching, where blight outbreaks occur or the tonnage a particluar buyer bought this season...i'm not saying this is the case, but just because a person works for a particular company doesn't mean they automatically know about the industry

Wow, I turn my back for a weekend and look what I miss. LOL

getting back to the OP, I read a bit on the VW Vortex about these Holsets. Cummins has always had a really good name for their engines, I do realise that they need to be matched to the engine regarding compressor size etc, but they are really cheap to rebuild IF you break one as well. Not sure which model number is a "Good" fit but for the cost compared to a Garrett they must be worth a look?

Again, the % benefit of BB is really not worth it for most people. Me being Mr Scrooge, I am one of said "most people"

What about the other bits and pieces though? Would I be looking at internals if I was not going to run High boost? FMIC or S3 style twin IC? larger MAF? TIP?

I don't know what's going on here anymore, but I do know I like potatoes!

Yeah I work for Holset (Cummins Turbo Technologies), which probably makes me a bit biased! But then again, I'll get sacked if I slag them off or say too much!

I just think it's the patriotic option! Even though we're American owned, our turbos are designed and developed in the UK, and that must be a good thing. We are leaders in the medium/heavy duty diesel markets for a reason.

Back to the point.....

I've heard that the standard internals can take up to around 300bhp, but you have to be careful with the torque levels apparently. Basically I have no idea! I'm guessing bengie will help you out with that sort of info.

If you really want a Holset turbo, you'll need to speak to the Aftermarket division about getting one matched up to your engine. Or just ask GS Racing what they would recommend.

You have the options of a cast aluminium, MFS aluminium or titanium impellor. Water cooled bearing housing, and water cooled turbine housing if your a boat! You can even have a VG turbo if you really want one, but that's going to get expensive.

what sort of money would that be then to get my K03s made a hybrid? and would it be good for 250bhp+

just thinkin now as I dont really want to go too big on bhp.

mind I am happy for now with the small amount I got lol

Oright Billy, how do!

If your only after around 250bhp maybe look into a K04. Might be a bit cheaper if you find a good donor engine to steal all the bits off! Plenty of threads on the pro's and con's and what bit's you'll need.

A guy I know has just replaced a K03 with a K04 in his Ibiza, and apparently it's a beast now! I'll have a chat with him and see what figures he's hitting. If he's had it mapped at RS Tuning then it should be a fair comparison to your current figures from them.