Rajab Long Runner RB26 intake

[Butters]

Having always liked long runner intakes , this has had my interest. 

The results look excellent.  What are your thoughts ?  

Suitable on a 1000hp(at crank setup) 

 

 3min mark for the back to back dyno test -->

https://www.facebook.com/RajabRacing/videos/6500898046628155

 

https://empireelite.com.au/RAJAB-RACING-RB26-INLET-MANIFOLD-p557351869

 

 

Edited June 1, 2023 by Butters

[2rismo]

Have they released any dyno testing data yet?

[Duncan]

1 minute ago, 2rismo said:

Have they released any dyno testing data yet?

whoa, who's the new guy?

They mention back to back testing on their website but didn't list the actual results 

[robbo_rb180]

Look good, I am more interested in that cast manifold they are testing....

[Butters]

18 minutes ago, 2rismo said:

Have they released any dyno testing data yet?

No data but the video i posted at the back half has back to back comparison from stock to rajab long. 

[Butters]

17 minutes ago, Duncan said:

whoa, who's the new guy?

They mention back to back testing on their website but didn't list the actual results 

It's in the video I linked. 

[joshuaho96]

17 hours ago, Butters said:

Having always liked long runner intakes , this has had my interest. 

The results look excellent.  What are your thoughts ?  

Suitable on a 1000hp(at crank setup) 

 

 3min mark for the back to back dyno test -->

https://www.facebook.com/RajabRacing/videos/6500898046628155

 

https://empireelite.com.au/RAJAB-RACING-RB26-INLET-MANIFOLD-p557351869

 

 

Interesting, I've suspected for a while that long runner is the way to go. Not sure how that packages though, it looks like it might be challenging to make everything fit.

[GTSBoy]

15 minutes ago, joshuaho96 said:

looks like it might be challenging to make everything fit.

I think it curls up above akin to a lesser RB manifold and so doesn't stick out to the driver's side to the same extent as other plenae. Should be better to fit.

[Butters]

Plus being 2 parts makes it viable to fit whilst in the car.

 

I have no doubt it will make more down low, just will it tap out around 800 hp.

The Rajab cars back in the day used to be the leaders but 650rwhp and 9 second VLs is no longer the upper end of power these days.

[Roy]

I run RB25DE inlet manifold on an RB25 (no VCT) with twin 2860-5s on E85 and it is more respo lnsive then generally the R32R33 GTRs with same turbo setups in same dyno. Whether it's cam timing or other things RB26 inlets keep pulling at 8,000rpm where I have found on two different setupa the long runners start fall over

 

To the point...I reckon I'll listen to a mate and try one of these on the spare motor

[GTSBoy]

9 minutes ago, Roy said:

RB26 inlets keep pulling at 8,000rpm where I have found on two different setupa the long runners start fall over

It shouldn't be too surprising though. Regardless of the length differences and their effects on pulse tuning (if any meaningful ones exist), the 26 runners are quite a lot larger than the 25's. This plays well into the 25 keeping velocity higher at lower revs for a torque boost and paying the penalty with high flow losses at higher revs.