Op6 Turbine, Any Gain?

[Torques]

Hello,

I was wondering if there is any substantial benefit from

high-flowing an OP6 turbo as compared to the standard (high-flowed) unit?

Edited November 10, 2011 by Torques

[Bsa]

It would allow for more power as it is less restrictive being bigger but saying that you will have more lag what engine is it going onto. Is it a r34 op6 turbo or a vg30 op6 turbo

[NYTSKY]

Slightly more power.

This was my first turbo upgrade and I have to say they are very laggy for the power output. You can get better gains/response from a Garrett upgrade however the costs are far greater.

Bang for your buck highflows are ok.

[Torques]

Thanks,

I actually fitted a high flowed unit (non OP6) a while ago and I do

not find it 'that' laggy compared to the standard turbo.

By coincidence I now got this OP6 turbo and was not sure if it was worth to throw

that one in.

So it's basically the same turbine wheel with a bigger housing then?

I thought the high-flow workshop might use a larger wheel in that housing.

Slightly more power.

This was my first turbo upgrade and I have to say they are very laggy for the power output. You can get better gains/response from a Garrett upgrade however the costs are far greater.

Bang for your buck highflows are ok.

[discopotato03]

What people call the OP6 turbine housing is a slightly larger version of what R33 RB25DETs get std , and dimensionally are almost the same .

Nissan seems to have had a habit of using larger , but not huge , turbine housings on larger engines in low boost pressure apps . Examples that come to mind are L28ETs RB30ETs and four cam VG30DETs . The idea is to not restrict the exhaust path too much in a larger low boost and sometimes non intercooled engine . I believe with the Z32 300ZX the reasoning was to get a heavy car going from low speeds and just cruising around - not a real high performance application .

If you use these turbine housings on smaller engines ie RB20s or RB25s with no other changes what it does is reduce the gas speed through the housing and reduces the turbine wheels speed for a given engine speed . Some people like OP6 housings on RB25s because they fit straight in and allow more power to be made at higher revs at the expense of low rev turbo response . If they modified their 25 it can make a bit better low speed torque than std which covers what they lost initially .

Some later R34 GTt RB25s use this housing too but its part of a system including different cams chambers and piston crowns slightly larger intercooler etc . All together they boosted the performance from ~ 184Kw to I think 206 kw .

I don't remember reading of anyone who liked these housings on RB20's because they slow the turbine response too much in an engine that probably needs boost as soon as possible . For a budget upgrade on RB25s they are good and probably essential if you built an RB30/25 and had to run the std turbo for some reason .

Hi flows are a different story and particularly the plain bearing ones , these will have more oil shear drag than a ball bearing centre sections do so theres a lot of potential to gain extra turbine lag with larger wheels and a larger turbine housing . The good news is that Nissans , Hitachis , ceramic turbine is small in diameter so these turbine housings can be machined to accept Garrett BB cartridges and conservatively sized ones can work quite well ie GT2871Rs .

The main thing to remember is that these housings and Hi Flows will always be a compromise and not quite as good as a turbo designed for a specific purpose .

A .

[Bsa]

There are plenty of good turbos for cheap on the market there days I wouldn't spend money on a high flow but if your on a budget they are very good value

[hypergear]

Hello,

I was wondering if there is any substantial benefit from

high-flowing an OP6 turbo as compared to the standard (high-flowed) unit?

To be exact 20kws and 45Mn increase based on the same chra. Has the potentical of making 320rwkws+ depending on how its been high flowed.

[zebra]

There are plenty of good turbos for cheap on the market there days I wouldn't spend money on a high flow but if your on a budget they are very good value

THIS

High-flows were good back in the days of Jap turbo kits for $8k or trying to adapt a little GT28 onto an RB.

Who Remembers the Sliding Performance turbos Aaron was doing?

Cheap and cheerful, but I dont think any of them lasted more than 12 months (I dont know of a single car that has one on it anymore)

High-flows will always have their place and it is good that GCG are still doing theirs and Stao/Hypergear and getting some very good results now, but they are a compromise..and I don't really like that aspect when it comes to outright performance (I had a MTQ high flow on my 33 for a long time)

[Torques]

Hello there,

Thanks for the feedbacks, much appreciated.

The OP6 Turbo is off an R34GTT, so same engine (as for cubic inches) as my R33GTSTS2.

What I got out of your replies is that the OP6 basically comes down to a different A/R?

So if OP6 is High-Flowed, the same turbine wheel is used (maybe?)

As for High-Flowing or not I have to say that I was attracted by the 'drop in' aspect of these.

My genuine turbo fell apart so high flowing it was the first option which came to mind.

However when I installed the new Turbo I had to find out the there was some struggling with the oil-feed and water lines.

(These were essentially minor issues, but I never had done this before so it took some time to get the right lines made)

Though the High-Flowed is not a ball bearing (as opposed to the genuine turbo) it does a good job and I feel it is not much different to the genuine unit )maybe 300-400rpm lag).

I will be on a dyno soon and post the boost curves.

Thanks, and cheers from London

Edited November 12, 2011 by Torques

[Bsa]

Kando dynamics are good turbos and cheaper then high flows in some cases I have a td06 and would buy one over a high flow any day. Also if you shop around you can pick up second hand hks and Garret turbos that people used for a 1000k and wanted more power For under a 1000 bucks. Iv also heard high flows get hot really quick due to such big wheels in small housings a lot of resistance

[hypergear]

Once again depending on how its been high flowed. I can high flow a OP6 with same / better performance as your TD06 with consistent out put, nothing gets hot. High flowed turbocharger saves major modifications to existing exhaust side setup. The real value in its power range is generally cheaper then a complete aftermarket setup, it also set you free from defects and cop problems.

How ever performance factor running tune length exhaust manifolds, intake, external gate and other enhancements supporting an aftermarket turbo will obviously gain better results then what came out of the factory. Its the result of a complete package rather then the turbocharger alone. Having said that, building a brand new turbocharger suiting its purpose efficiently is easier then modifying a turbo that was built for some thing else.

The decision should be made based on the useage of the car as, performance goal and over all cost.

[Bsa]

Agreed

[Torques]

Hi ..

Yes, I looked into these Kando turbos for a while.

I found them interesting, but (and if you're talking about the TD06H series)

1. only oil cooled (except for TD06H-20G)

2. exhaust side does not match the R33 dump

3. turbo outlet does not attach to standard piping

4. oil/water connectors require custom lines

5. journal bearing (so no advantage over HF turbo)

Here's the TD06H you might have had in mind(?)

http://www.ebay.com.au/itm/Kinugawa-Turbocharger-3-Nissan-RB25DET-R33-TD06H-20G-/280763016554?pt=AU_Car_Parts_Accessories&hash=item415ec7a56a

So that's why I went for the high flowed which actually seems to be quite nice...

(though I have no other comparison than the standard turbo)

Kando dynamics are good turbos and cheaper then high flows in some cases I have a td06 and would buy one over a high flow any day. Also if you shop around you can pick up second hand hks and Garret turbos that people used for a 1000k and wanted more power For under a 1000 bucks. Iv also heard high flows get hot really quick due to such big wheels in small housings a lot of resistance

Edited November 13, 2011 by Torques

[Bsa]

You can get them t3 I'm using one on a stock manifold turbo comes as a kit all lines come with it. Yes the dump needs changing and cooler pipe extended but that's nothing big. If your happy with the highflow then sweet I'm not saying they are bad I'm just stating for the money you pay for a highflow you can get a bigger turbo all together then add 200 for dump and cooler pipe.

[zebra]

Journal bearing means absolutely nothing unless you are comparing identical turbos,

TD06-20g out spools and out powers the HKS GT-RS

[zebra]

What could be an option, would be to buy a kando td06sl2-20g minus exhaust housing and have stao machine the oem RB turbine housing to suit, if you wanted a bolt in option