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Rb25 Turbo On Rb20 Help

silvercam

By silvercam,
in Engines & Forced Induction

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silvercam Contributor

silvercam

Posted
Posted

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

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silvercam Contributor

silvercam

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Posted (edited)
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 by silvercam
silvercam Contributor

silvercam

Posted
  • Author
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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 :P

thanks for the comment

bubba Grand Master

bubba

Posted
Posted

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 :)

silvercam Contributor

silvercam

Posted
  • Author
Posted (edited)

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 by silvercam
bubba Grand Master

bubba

Posted
Posted

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 :P

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