rb26dett intake manifold and itb's on a rb20 head

[craz4240]

good stuff but I feel that a full on tune will be needed to take advantage of the itb's.

I was thinking the same thing

I'm excited to get the price on this good work!!!

[Bluefire]

Wow, the direction this thread has taken makes me sad.

Brody, Good work man!! I'm a big fan of the idea and execution. Personally, I wouldn't reproduce this part. I'd keep it all to myself. Especially after the way people are already whining about a price that hasn't even been set yet for a part you haven't even completed.

This isn't something he whipped out with a rotary tool in his garage. It's a specialty, low volume, niche market piece that you can not buy anywhere else. Last I checked, if you don't like the price of something, you don't have to buy it.

To all the experts who chimed in with their cost estimates, I'd love to see you get one of these made for less than 500. Now keep in mind. Part of that money would be to pay a shop to do all the R&D for proper fitment. Then, you'd get to pay a machine shop the set up fee. Buy the material, and then hope it turns out good and fits well. If not, well then you get to pay them all over again.

Sure, if you worked at a machine or fab shop that had all the equipment, and you did all of the labor yourself, it could be done cheaper. But, if you bought this hypothetical kit, you wouldn't have to do any of that.

To all the whiners. Please zip it. Let him decide if he wants to make it and let the rest of us have a shot at buying it. Then, you can buy the poor fitting knock offs on egay!

Well put!!! Most the people in this forum have no idea what it takes to actually fabricate a part. Anyone that looks at this and thinks its just a piece of aluminum has never fabricated a day in their life. Like I said before, make your money bro... Don't listen to any of these cheap *** low ballers here. You know what the piece is worth, so price it accordingly

-Bluefire

[l0nestar]

Well put!!! Most the people in this forum have no idea what it takes to actually fabricate a part. Anyone that looks at this and thinks its just a piece of aluminum has never fabricated a day in their life. Like I said before, make your money bro... Don't listen to any of these cheap *** low ballers here. You know what the piece is worth, so price it accordingly -Bluefire

I know that it is not 'easy'. If it were, this thread never would have existed in the first place. (26-25 is easy-ER since the ports are very similar , but still, not EASY.)

I know how to fabricate.

So far everything sounds like Brody is doing his homework.

But agreed, a new tune is something to factor in as well. I am interested to see flow-data, along with a 'stock' vs. 'tuned' data.

PS. I'm still interested in a 26-25 plate / kit.

[ryan15]

damn cant wait to see the results, this thing is going to own!!!

Still intrested!

[ripracer]

yes and I just found a guy at the drift track last weekend willing to sell me his GTR manifold, becuase he wanted a shiny one.

[Benz_200t]

when using the 26 ITB setup.....

where is the position of the TPS from the 20??

assuming that the tps from the 20 has been fitted in any way....

are there any problem with is if i am using standard ecu and no upgrades at all??

[craz4240]

when using the 26 ITB setup.....

where is the position of the TPS from the 20??

assuming that the tps from the 20 has been fitted in any way....

are there any problem with is if i am using standard ecu and no upgrades at all??

I'm gonna say an ecu tune is gonna be 100% needed.

[HPF Chrisk]

Any Updates on whats going on?

[HxC_Nismo]

when using the 26 ITB setup.....

where is the position of the TPS from the 20??

assuming that the tps from the 20 has been fitted in any way....

are there any problem with is if i am using standard ecu and no upgrades at all??

the rb20det TPS is pretty much the same as the rb26dett cause i just bought one off ebay for $11 and in the pics it looked exactly the same as my rb26. and to let you all know when ever i see sensors and other parts on ebay i always like to buy em for spare parts.

[DriftX]

I'm sure the exhaust note would change quite a bit going from a single 60mm tb to the itb setup.

Good work, I like to see innovation.

[M374llic4]

Now just get a RB26 head on an RB25 block XD

[DriftingisLame]

Has anyone read 90% of the threads you get from a search on SAU about this mod? They will tell you a magazine called "Zoom" did this on a pretty well modified rb20, and aparently lost power everywhere. They put the stock manifold back on and got it all back. I know its really convenient and looks way better having the same side plenum, and I'd personally take a small power loss to favor simplicity, looks, and ease of repair, but they said the loss was BIG.

I personally think the lack of displacement and the ITB's might have played a role in why this setup works so well on a 26 and not 20. Lack of piston speed will make a manifold that was built to flow for a 2.6L motor not flow efficiently enough until a much higher engine RPM.

What I've done is sliced up the lower runners of an RB20, and I'm going to weld a 26 plenum to those, and the stock 20 throttle body to that (once I find a plenum for a good price). I think using the stock rb20 throttle body might keep more low end, of course, this is all just theory, since I have not tried any of this personally, I dont have a flow bench, and I dont have a dyno...

Any thoughts?

[ryan15]

I have heard of this, I dont have any results to show for it, but I do know a guy with a done up manifold for an rb26 for 300 on 240sxforums.

[tight240]

Sorry for thread jacking again, but if you looking for just the 26 manifold let me know i have one im trying to get rid of, $100 plus shipping.

[DriftingisLame]

Sorry for thread jacking again, but if you looking for just the 26 manifold let me know i have one im trying to get rid of, $100 plus shipping.

E-mail address?

[tight240]

[email protected] i have pics and everything.

[Bad News]

Put me on the list for a 25.

[omgsky]

Dyno yet?

[omgsky]

Man, I want to see the dyno on this!

[R31str]

the adapter piece has to be atleast 1" thick to clear the waterneck... The kit will include all hardware and the 1" longer studs. We are re-digitizing the completed piece after we have done all the custom "by hand" work, this will allow us to do more with the waterjet and less with the tedius milling, all-in all it will look better than the one you have seen!

rb20 list:

1.NismoZilvia2.ripracer3.ryan154.StricNyne5.uber956.one puff

rb25 list:

1.midnightsliding2.L0nestar3.HPF chrisk

will pay anyfing for the adapter. my engine rb25..

i allready got a jun RB26 inlett manifolds and the TB's all i need is the RB25 adapter plate. that will be awsome.i bought the parts last year after seeing the blitz add on the HPI magazines. then checkt out every AUTObarn for it and they neva new it existed. my machanic tried 3 difrent places to get custom made and no luk wif dat. my car is still in the workshop from novemba last year, waiting for sumfing.... hopefully dis could be a dream cum true..... my car is at EFficant Autos, brunker rd greenacre... interested in product aswellmy msn, [email protected]. 0430020052amount$$$ il pay any price ASAP

[R31str]

i wana buy the gtr adapter plate for my rb25. will pay top dollar, email me any info or call me .email.. [email protected]. 0430020052

[l0nestar]

will pay anyfing for the adapter. my engine rb25..

i allready got a jun RB26 inlett manifolds and the TB's all i need is the RB25 adapter plate. that will be awsome.i bought the parts last year after seeing the blitz add on the HPI magazines. then checkt out every AUTObarn for it and they neva new it existed. my machanic tried 3 difrent places to get custom made and no luk wif dat. my car is still in the workshop from novemba last year, waiting for sumfing.... hopefully dis could be a dream cum true..... my car is at EFficant Autos, brunker rd greenacre... interested in product aswellmy msn, [email protected]. 0430020052amount$$$ il pay any price ASAP

Crikey! Spelling and Grammar Police! Citizens arrest! Is not 'English' the language of NSW?

Also, it has been LESS THAN forty-five minutes since your first post.. Be patient!

[rbsileighty]

Has anyone read 90% of the threads you get from a search on SAU about this mod? They will tell you a magazine called "Zoom" did this on a pretty well modified rb20, and aparently lost power everywhere. They put the stock manifold back on and got it all back. I know its really convenient and looks way better having the same side plenum, and I'd personally take a small power loss to favor simplicity, looks, and ease of repair, but they said the loss was BIG.

I personally think the lack of displacement and the ITB's might have played a role in why this setup works so well on a 26 and not 20. Lack of piston speed will make a manifold that was built to flow for a 2.6L motor not flow efficiently enough until a much higher engine RPM.

What I've done is sliced up the lower runners of an RB20, and I'm going to weld a 26 plenum to those, and the stock 20 throttle body to that (once I find a plenum for a good price). I think using the stock rb20 throttle body might keep more low end, of course, this is all just theory, since I have not tried any of this personally, I dont have a flow bench, and I dont have a dyno...

Any thoughts?

I think you're on the right track... I wouldn't be surprised to see a manifold optimized for a RB26's stock power and power band cause a few problems for a RB20... it's kind of like some of the guys over in the S2000 forum not understanding why running a short runner ITB setup doesn't make more power but makes it very peaky... shorter runners will move your peak power up in the rev range... the S2000's already up in the top with the stock setup so you expect peak power to move outside of the motor's operating range. It's all about designing the intake setup to the motor and it's power goals... this is why I'm concerned about the TODA ITB setup on my AP2... it has a 2.2L but all of the other AP1 and 2's in other countries have the 2.0L's... but TODA does make a 2.2 and 2.4 kit so who knows... and I haven't been able to get them to respond to emails yet... but back to RB's

So if you want to go ITB's and you're "stuck" using the 26's you might as well make a new plenum/runners (or at least alter the ones you have) to match the cams and TB sizes you are running... maybe the 26 plenum will make power... but going by the research you've done it could be well past the RPM range the 20 is capable off. The stock TB on the RB20 isn't that small... I'd be surprised to see it being a restriction for reasonable 20 power levels, and on the plus side the smaller diameter should give better resolution in throttle modulation

I like the way you think... keep up the good work!

[Tenchuu]

I'd be down for one of these for a RB25, but have to see dyno and pricing before i throw my paypal out here.

but interested, veary interested.......

[Revat619]

What about an adapter plate for the rb20 to 25 .So 20 guys can use the greddy manifolds instead of having the only option of running the GTR one. I dunno if this has been discussed or not or whatever. If it has, i apologize. Just my $0.02

[tight240]

Im thinking about gettin rid of my itb setup if anybody is interested. I dont think i need it.

[skyvia01]

Very interested as well. Any dyno results yet?

[Cjmartz2k]

I stopped reading this thread a while ago due to the bickering about price crap.

I've got one the Blitz adapters on my RB25, and it's pretty nice. ITB's give great throttle response, and that stock intake ain't choking the motor anymore, although I don't think it was that much at around 500hp before anyways. Now I'm ready to flow more!

Just a word to the wise, don't know if it's been mentioned here before. VCT solenoid will not clear the coolant passage on the front of the 26 intake with out some "custom" work. I just blocked mine off.

[BrodyGoble]

Well after ALOT of testing we finally have the end product, great sound, awesome response and yes it makes the power! Here is some video of the car at the track about a week ago! Lets get some interest in these adapters again, everything is ready to go.

Sorry for taking soo long guys!

Listen for the awesome intake sound coming out of turn 1.


Modified by BrodyGoble at 5:41 PM 7/24/2008

[toplessKAT]

Finally! I thought you were dead man!