RB26 intake manifold on RB20

[Hcr32typem]

So ive seen this done in Japan a few times and i got to wondering why it might be done? It seems like it would only add complication to the engine.

Is it a more responsive setup for the engine or really only "cooler engine bay" type mod?

[GTSBoy]

ITBs are much snappier (throttle response) than a big open plenum - hence why the 26 had them in the first place.  Realistically, on an RB20, it is nothing more than a looks cool / internet points type of thing than being of any usefulness.  Doesn't really affect how much power or torque you can make.

[Hcr32typem]

13 hours ago, GTSBoy said:

ITBs are much snappier (throttle response) than a big open plenum - hence why the 26 had them in the first place.  Realistically, on an RB20, it is nothing more than a looks cool / internet points type of thing than being of any usefulness.  Doesn't really affect how much power or torque you can make.

So realistically its not even going to help with response on an RB20? I wonder why people do it at all? Ive seen plenty in Japan and found several companies that make full adaptor plate sets to bolt it on directly.

Edited November 5, 2018 by Hcr32typem
Shpelling arrors... :p

[GTSBoy]

It will help with throttle response....that 10th of a second when you modulate the throttle is much better.  Boost response is a totally different thing and, no, it will not help at all.

People do it because OMG WTF !!!  RB26 Godzirra!

[Dobz]

There would likely be some advantage to the 26 itb's if the engine was purposed for high rpm operation only, other than that it's a waste of time and money.

[iruvyouskyrine]

I did it on my car and while i don't regret doing it i would not do it again or recommend it to others. If i had my time over i would have gone plazmaman top half and a DBW throttle 100%. 

Do not, and i repeat, do not buy the OtakuGarage adapter plate. It looks great but the f**king around required getting it to (barely) fit is nothing short of a nightmare and requires a lot of custom fabricaiton to be done. Who else out there is offering an adapter kit?

 

[Robocop2310]

18 minutes ago, iruvyouskyrine said:

I did it on my car and while i don't regret doing it i would not do it again or recommend it to others. If i had my time over i would have gone plazmaman top half and a DBW throttle 100%. 

Do not, and i repeat, do not buy the OtakuGarage adapter plate. It looks great but the f**king around required getting it to (barely) fit is nothing short of a nightmare and requires a lot of custom fabricaiton to be done. Who else out there is offering an adapter kit?

 

It does look very nice those. ?

[Hcr32typem]

17 hours ago, iruvyouskyrine said:

I did it on my car and while i don't regret doing it i would not do it again or recommend it to others. If i had my time over i would have gone plazmaman top half and a DBW throttle 100%. 

Do not, and i repeat, do not buy the OtakuGarage adapter plate. It looks great but the f**king around required getting it to (barely) fit is nothing short of a nightmare and requires a lot of custom fabricaiton to be done. Who else out there is offering an adapter kit?

 

The on i found i liked in particular is a TS Factory part from Japan

[iruvyouskyrine]

Got a link to it?

[Hcr32typem]

1 hour ago, iruvyouskyrine said:

Got a link to it?

http://ts-factory-hp.com/product.html

Its the third product down on the left. 

Im mostly interested if its more responsive mainly because the build on my Type M is to make 220kw or so but have much better response. I live in the mountains and having a super responsive package is ideal for the roads i drive.

[GTSBoy]

To repeat, ITBs can in no way affect the type of "response" that most people mean when talking about turbos.  The "response" of a turbo engine is usually assumed to mean where the boost threshold is or how laggy it is (which are not the same thing).  It is not usually meant to refer to the throttle response.  ITBs are all about throttle response.  The reason they are so snappy is simply because the volume of inlet runner downstream from the throttle plates is much smaller and the effect on the flowrate is therefore that much faster.  In the order of 1 or 2 tenths of a second though....not hundreds of rpm like with turbo response.

[Dose Pipe Sutututu]

3 hours ago, Hcr32typem said:

http://ts-factory-hp.com/product.html

Its the third product down on the left. 

Im mostly interested if its more responsive mainly because the build on my Type M is to make 220kw or so but have much better response. I live in the mountains and having a super responsive package is ideal for the roads i drive.

if you want response you're going to need a twin scroll, twin gate, divided rear housing setup. ITBs don't just magically give you unicorn response, what you do get is a tiny bit better transient response. 

Also On a RB20 going to a RB26 ITB you're going to actually degrade your mid range torque as well, and the bonus a laggier turbo.

[Hcr32typem]

14 hours ago, Dose Pipe Sutututu said:

if you want response you're going to need a twin scroll, twin gate, divided rear housing setup. ITBs don't just magically give you unicorn response, what you do get is a tiny bit better transient response. 

Also On a RB20 going to a RB26 ITB you're going to actually degrade your mid range torque as well, and the bonus a laggier turbo.

So realistically its more or less useless haha. 

[Dose Pipe Sutututu]

Pretty much, I would just run the stock plenum with a Plazmaman style or genuine plenum (if looks is what you're after) and spend that money on a decent turbo setup and cams. 

[iruvyouskyrine]

23 hours ago, Dose Pipe Sutututu said:

if you want response you're going to need a twin scroll, twin gate, divided rear housing setup. ITBs don't just magically give you unicorn response, what you do get is a tiny bit better transient response. 

Also On a RB20 going to a RB26 ITB you're going to actually degrade your mid range torque as well, and the bonus a laggier turbo.

This is exactly what i have.

RB20 with twin scroll manifold, twin scroll rear housing, twin wastegates and even some EFR magicness. And RB26 ITB's. I promise you it's not worth the money lol, ask me how i know.

 

[admS15]

This is exactly what i have.
RB20 with twin scroll manifold, twin scroll rear housing, twin wastegates and even some EFR magicness. And RB26 ITB's. I promise you it's not worth the money lol, ask me how i know.
 

How?[emoji854]

[Hcr32typem]

20 hours ago, admS15 said:

How?

+1 haha

[Jordie Lewis]

On 11/5/2018 at 8:43 PM, iruvyouskyrine said:

I did it on my car and while i don't regret doing it i would not do it again or recommend it to others. If i had my time over i would have gone plazmaman top half and a DBW throttle 100%. 

Do not, and i repeat, do not buy the OtakuGarage adapter plate. It looks great but the f**king around required getting it to (barely) fit is nothing short of a nightmare and requires a lot of custom fabricaiton to be done. Who else out there is offering an adapter kit?

 

Sorry for bumping and old post. Just wondering if you or anyone else has any experience in using this adapter plate. If so what were the main hurdles needed to get it to work.  

[Jordie Lewis]

Now I understand. 

Copied from my build thread on Zilvia

 

 

So. As the saying goes, bolt on is never truly bolt on. 

This post will detail the mission, rather exercise in frustration that is getting ITBs to fit with the Otaku RB20DET adapter plates. People who have used them have just said that they are tough to get to work correctly but dont offer any details in what the process actually was. 

To start,  I would like to add that they were quick to answer any questions I had over instagram and this isnt a stab at them or anything.

When I had mocked everything up on the stand there was a huge interference in between the coolant passage on the Rb26dett intake manifold and where the thermostat would like to live. Turns out that even with the proper parts it would be a game of Millimetres to get everything to play nice.

Otaku instructed to get an RB30 thermostat housing for more clearance and to modify the lower coolant passage.

I marked in black the areas I needed to further modify the thermostat housing.

Modified the coolant passage and machined down the lower screw boss to get it to clear the thermostat housing. Just clears as is but still no room for the lower rad hose. 

Got the thermostat housing cut and angled down to free up some more space. Also you can see I had to countersink the top bolt hole as well. Everything finally clears. Time for "final" assembly.

I also drilled out the threads marked with the "X" this is to allow the fastener to go through both plates into the block. I was concerned that the small area around the front water port wouldn't seal correctly.

I made a gasket to go inbetween the two plates and used a light buttering of RTV to make sure everything is sealed correctly. I completed the assembly with an HKS RB26dett intake manifold gasket set. 

Those are the main hurdles in getting the otaku ITB adapter kit to work on RB20det. I can see why people knock on the kit because its pretty fiddly and doesnt fit out of the box.

Now I dont know yet if it leaks or anything. This was just to make it all  physically fit. 

 

 

 

Edited June 25, 2020 by Jordie Lewis

[KiwiRS4T]

People don't just knock on the kit - they say "don't do it".

Look forward to your report when you have it all up and running.