Standard Afm --> Turbo Intake Pipe

[Cake]

Couldn't find any information on this when searching...

I have heard that on an RB25DET, the rubber flexible pipe from the AFM to the turbo often sucks closed at high boost? What are its limits in either power or boost levels, before it needs to be upgraded?

cheers,

Chris.

[J_R32]

u would need relatively high amounts of boost (generally speaking) above 1 bar. But the intake pipe mainly suffers from too much heat making it "soft" thus allowing it to be sucked closed.

[illusiVe]

just go ss anyway

[Sydneykid]

On the R34GTT we started to run into problems around 245 rwkw. Boost was irrelevant, it's all about the airflow through the tube. How much resistance to airflow (boost) there is after the turbo has no effect whatsoever.

Cheersw

[Ceffy_SA]

Would someone be able to tell me what the consequences of the rubber induction hose "sucking" closed e.g. boost drop/power drop?

Also i have been told that there should a metal winding through the induction hose too, my RB20 dosent have one so it is VERY easy to squeeze and collapse the pipe. Would it be worthwhile finding a RB20 one that has that bit in there, or just going a full metal induction pipe?

[predator]

I don't believe they have any metal ribbing in them.. not the early rb20 ones anyhow.

You could always make some ribbing by winding some heavy wire around a cylinder of the same diameter as the tube. Then insert. Cheap non-bling option..

[Ceffy_SA]

You could always make some ribbing by winding some heavy wire around a cylinder of the same diameter as the tube. Then insert. Cheap non-bling option..

haha yea thats true, i also woudnt get the uber cool extra loud turbo flutter without a metal induction pipe.

I think i will try finding some wire to put in there as a fix. I have also heard about people making up some bent steel piping and putting it inside the std rubber pipe.

[Abo Bob]

Mine sucked shut at 228rwkw. It just loses power when it's warm particularly high in the revs. It was actually fine on the street but sucked at the drags.

I didn't know the R33's etc had the same problem.

[Cake]

thanks guys, for those of you that did upgrade your pipe... did you get it custom made, or are there some pre-fab ones available?

cheers,

Chris.

[mr_rbman]

you also got to make one if you put a larger turbo on your car with a big compressor which i'm doing at the moment

not as easy as i would have hoped

[Abo Bob]

I got one made by Micks Metalcraft.