Rb25 Turbo On Rb20 Help

[silvercam]

i have just finished bolting an rb25 series 2 turbo on my rb20 ceff motor after broken studs and turbo not fitting it is finally on but it seems to not be releasing boost i have the rb20 acuator on the rb25 turbo the thing is i had to move the arm a bit to get it to line up so i am thinking the acuator arm isnt coming out enough to open up the exhuast flap it boosts to stock ten and holds but seems like it stuggles to get there. when it releases it make a weird like blow of value sound but i have the normal plumb back setup but it sounds the the boost is being held in its not the normal psss would it be cause of the actuator isnt releasing help? cheers

[QWK32]

dude if your actuator wasn't opening all the way you would over boost. kinda hard to make sense you, no paragraphs or full stops. you could take the arm of the flap and see if its closed in that position.

[R31Nismoid]

Please post questions clearly.

What you are saying contradicts itself with the gate not opening & slow boost build - it simply cant occur!

[silvercam]

Please post questions clearly.

What you are saying contradicts itself with the gate not opening & slow boost build - it simply cant occur!

hey sorry about the post i was on my way out, still cant seem to work out why i am getting this weird sound.

mate reckons it could be my stock plumb back is not releasing air so my spring is only opening a little bit.

any other ideas?

Edited October 5, 2007 by silvercam

[1400r]

the arm need to have free movement try bend it carefully till it can

Im assuming the Act is off your old turbo which had no boost problems so I doubt its stuffed Act

[silvercam]

the arm need to have free movement try bend it carefully till it can

Im assuming the Act is off your old turbo which had no boost problems so I doubt its stuffed Act

yeah it doesnt have free movement, maby that is the problem will give it a go and get back to ya

thanks for the comment

[Kane_R32]

Rb25 turbo with stock bov setup does make a woosh noise, very minor.

There could be other reasons why it seems to be struggling to get there other then the turbo itself.

List your mods..

[bubba]

Mine makes a wooshing noise too and sometime if I'm off the gas quickly when on full boost it flutters a bit and a get a nice pop out the exhaust (likely due to the extra fuel being thrown in as a result of the flutter).

117,000km RB20DET (known km's..)

RB25 s1 turbo

FMIC

Greddy Profec B spec2

standard untuned ecu

standard injectors

made 183rwkw @12psi on Hyperdrives dyno today

[Cubes]

Where does it make 10psi?

Compared to the stock rb20 turbo the rb25 turbo I guess does feel like it struggles to get there. I.e lags more.

[MRDeanos.]

how much bigger is the 25 turbo compared to the 20 ??

[Cubes]

~15rwkw bigger.

[MRDeanos.]

ah k is it just bolt on?

no extras

[Cubes]

Providing you get the 90degree elbow with it yes it does just bolt in.

BUT to make the most of it you need an ecu tune.

[MRDeanos.]

ah k how they goin for roughly ? and are they a stronger turbo?

[silvercam]

hey car is fine, your right bubba mine is the same. mate reckons i am tripping just makes a different sound becuase it is releasing more air. The gain is huge compared to stock pulls harder through the whole rev range. Think i just mite need a tune dumps a bit of fuel lol cheers for the help

Edited October 7, 2007 by silvercam

[bubba]

The 25 turbo is shitloads better than the 20 turbo. I think it has shifter full boost probably 1000rpm higher.. with the 20 turbo my car would start spooling about 2000rpm and full boost before 3000rpm, now I'm starting to spool about 3000rpm and full boost about 3500rpm (got a dyno sheet with boost reading, I'll post that up soon).

I will be using this 25 turbo on the 30 to start with while I save for a bigger turbo.. will probably make boost from idle on the 30

[Ronin]

Ive got a 25 turbo on my 20 with a pod filter and it makes a very load wooosh noise. With the stock airbox its much quieter but still there.

[nisskid]

rb20 turbo without remap and stock dump vs rb25 turbo with remap and 3" dump = barely any noticeable difference in lag.