Rb26dett + 2860 -5 = Surge? Myth?

[Phantom Snail]

I have been told by my fabricator / tuner that in all likely hood, a twin 2860 -5 will probably surge ...

Application is bolt straight up to standard engine and standard manifold, aftermarket exhaust, injectors and all the small supporting mods ... 20psi ~ 340ish awkw.

Reasoning - both turbos will be pushing large amounts of air ... in doing so, they will fight against each other and surge / cause the boooof boooof boooof air pressure noise .... and the turbos will shiet themselves eventually...

Basically, any twin setup size that is 2860 -5 size onwards, will have this problem on a standard manifold/application...

Does any1 have any experience with this?

Does it sound right at all?

Edited March 7, 2009 by Phantom Snail

[R31Nismoid]

They wont surge if you run stock BOV's, stock piping.

[N1GTR]

RB36 hey, that would be nice

[Phantom Snail]

They wont surge if you run stock BOV's, stock piping.

But can stock BOVs handle 340ish awkw? wouldnt it leak under that kind of power?

RB36 hey, that would be nice

LOL my apologies typo!

[R31Nismoid]

But can stock BOVs handle 340ish awkw? wouldnt it leak under that kind of power?

You haven't really used the search have you?

600rwkw no problem stock BOV's

[Swiper the Fox]

RB36 hey, that would be nice

Robbie Ward strikes again

[PHA71L]

i have none at all so far... just 16psi stock manifolds dumps bovs i do have a hard pipe kit but thats it 400hp 300kw at the rears

[donkeypunch]

yeah ive got big surge....... does it actually kill the turbo's????????????????????????????????????????

[Mr. Keets]

Very very minor...similar combo on 17psi

[Phantom Snail]

Anybody else with twin setup + surge or no surge?

[paulr33]

mythbusters ahoy!

there are two known occurances of surge that we usually refer two in the GTR twin turbo setup

1) compressor surging known and heard as "flutter" when coming on boost

this is a result of the pressure in the manifold going past the compressors effiency, ie the compress map says in the best scenario it can flowing at best 16psi of compression, but for some reason the manifold pressure is say 18psi so the compressors surge resulting in vl turbo style flutter on boost, ie: the compressors are out of effeiency and surging / erractic operation / wobble

any form of compressor surge is bad, can be fatal, and should be avoided/corrected at any cost

2) compressor chuffing / the turbochargers chuff when coming on boost / aka shuffling

this is usually caused by aftermarket pods and piping kits to the stock turbo's. basically the air reverbates and chops past the airflow meter, so it runs like a bitch.

this is common with say 2530s and custom piping and pods. not very common on stockers i dont think, but certainly possible

the std accordian style pipework reduces this by altering the path of airflow, when you replace with shiny smooth pipework, the problem occurs

if #1

compress surging, try lowering the boost, see if that helps

the compressors shouldnt surge under normal conditions

could indicate compressor failure, out of balanace or chopped wheels

again assuming the same problem occurs on say stock boost

if #2

try seperating the pods or putting a shitload of pipework between one of them or both them,

try like some good sized pool shop vacuum hose for one of both of the pods, try bending the pods intake pipes.

anything to alter the intake path of air to the compressor inlet snout

[bloodzkull]

2860 -5 greddy hard pipe kit, wolf v500 ecu, 19psi, 346kw at the wheels, no shuffle at all.

[R33GTRKid]

GTSS, HKS hard pipe kit, PFC djetro, 18PSI, 331RWKW, no shuffle at all

[Ronin 09]

GTSS, HKS hard pipe kit, PFC djetro, 18PSI, 331RWKW, no shuffle at all

interesting, seeing that he's asking specifically about a different turbo...

2860-5, 340kw, no shuffle. Std airbox, greddy hard pipe kit, std BOVs.

[donkeypunch]

when i bought my GTR, one of the things that sold me on my car was hearing the sweet sound of the turbos spooling, as ive said before im not a big fan of all the BOV, wastegate loud exhaust's noises etc, so when i got my car back was kinda gutted.

big turbo shuffle, BOV noises (even though its plumbed back) etc.

would some how building a box around the pods mask the noise, not that is any room!

just wanna here the -5s aye