Jump to content
SAU Community

Recommended Posts

Stagea RB25DET stock as a rock.

Harsh induction noise at around 5,000RPM sound is similar to a fan belt slipping or loud air leak, have all the belts as tight as you would want them. Sound seems to be coming from turbo area, only at high RPM with a stab of throttle in Neutral. Happens on the road too when kicked down (auto box).

Have unplugged the BOV to see if that was where the sound was coming from but no luck, only just coming on to boost but it is definitely down that path somewhere. The car is freshly imported so has come to me with this problem so I can't shed any light on how it may have developed.

I am not going to flog it to see what happens, just wondered if any turbo experts out there could throw a suggestion in the ring? My Dad is a mechanic but has very little experience with turbos (I have less!), we are not sure where to look and want to avoid major pull downs for something that may be simple.

Any recommendations for a Turbo workshop in the Geelong area would be great too? Would love to have someone that knows their stuff have a look and listen...

Cheers

Luke

would this be like a screaming sound?

I wouldn't say screaming... loud like a belt slip but not "holy crap, what's that?" loud... It doesn't sound right but not catastrophic at the same time...

Luke

Hmmm... Have a look at the exhaust from underneath the car... Are there any pipes running off the waste gate/turbo that are cut off and vented atmospherically??? If so, you have a screamer pipe :ban: that’s the only conclusion i can think of if its an "induction" noise heard at around 5000RPM as that is when the waste gate is fully open... The screamer pipe is a separation of the waste gate housing from the turbo as to vent the boost pressure atmospherically, its meant to help increase top end power however is illegal in Australia... sounds awesome on large turbos... Let us know how you go..

Regards,

Sarkis

Also check your exhaust manifold, dump pipe and front pipe for cracks. I had a similar problem on my s15, once the turbo started really boosting it made a noise similar to what you describe. If your car ever scrapes or bumps over anything (speedbumps, ect) this can certainly happen, even tiny cracks can cause this.

Cheers

Nick

Edited by stolen_s15
Also check your exhaust manifold, dump pipe and front pipe for cracks. I had a similar problem on my s15, once the turbo started really boosting it made a noise similar to what you describe. If your car ever scrapes or bumps over anything (speedbumps, ect) this can certainly happen, even tiny cracks can cause this.

Cheers

Nick

Will be investigating pipes and possibly manifold and turbo to exhaust gaskets, don't want it to be a turbo bearing!!! I have only driven it 40km and it's not even on the road yet... :ban:

It's doesn't scrape on anything, pretty stock height but the car is new to me, no existing damage underneath so I think I am pretty safe there.

Great advice guys, keep it coming.

Luke

To add to this, another question: In neutral, slowly bring the revs up to 3k, should I see boost?

I see vacuum, but do get some boost when bringing revs up quickly with a reasonable, not to aggressive stab of the loud pedal...

Luke

are you getting any error codes from the consult port (assuming you still have a stock ecu)??

Stock ECU, stock everything as far as I know, have not gone down that path yet.

you will only get boost in neutral if u really punch it. there is no load to bring the boost on.

Really? That's very good to know, so if I "stall it up" I should see boost? Will try that tomorrow.

Cheers

Luke

thats one advantage of turbo's over superchargers. in a manual turbo if you miss a gear and rev it out there is little boost, where-as in a supercharger if you miss a gear the engine still cops full boost. thats why holden never made the supercharged v6's in manual.

Matey - has the sweet-as Stag got a pod filter (no airbox)? They make 'induction' noise, sort of.....

damn that sucks that you've got a worry so early in Stagea ownership. it'll come good tho, no doubt about it :ban:

Matey - has the sweet-as Stag got a pod filter (no airbox)? They make 'induction' noise, sort of.....

damn that sucks that you've got a worry so early in Stagea ownership. it'll come good tho, no doubt about it :P

All stock air box etc.

Yeah I know dramas, will get it sorted, don't have a choice!

Luke

Hmmm... Have a look at the exhaust from underneath the car... Are there any pipes running off the waste gate/turbo that are cut off and vented atmospherically??? If so, you have a screamer pipe :( that’s the only conclusion i can think of if its an "induction" noise heard at around 5000RPM as that is when the waste gate is fully open... The screamer pipe is a separation of the waste gate housing from the turbo as to vent the boost pressure atmospherically, its meant to help increase top end power however is illegal in Australia... sounds awesome on large turbos... Let us know how you go..

Regards,

Sarkis

Well considering he says it does it in neutral... and a screamer/wastegate wont open in neutral

its fair to say that its got nothing to do with a "screamer" pipe

mate the best place for work on turbo's is Dalton's down on wood st. chris is real helpful and he would screw you around. also geelong tuneups which is on wood st to are supposed to be pretty cluey. (i think one of the guys there racers in some porsche league).

either way there are both off fyans street.

good luck

mate the best place for work on turbo's is Dalton's down on wood st. chris is real helpful and he would screw you around. also geelong tuneups which is on wood st to are supposed to be pretty cluey. (i think one of the guys there racers in some porsche league).

either way there are both off fyans street.

good luck

ICER33

Thanks for the info, I will look them up, would be nice to have a trained ear have a listen before I get too carried away...

Cheers

Luke

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • My dream is also to have a proper hoist, but I don't think it will ever happen. My quickjack is probably as close as I'll ever get, it really is very good though. 
    • Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
    • BTW I measured the jack I have, it is 70mm at the saddle but you only have about 700 until it returns to 150mm high at the cylinder so it is good but no magic bullet.
    • My experience with Rising Sun Exports Before agreeing to the sale I tried to do as much research as I could (obviously), his Facebook reviews are 98% and he goes Live at least once or twice a week. I contacted 2 people in the UK who had used him for their imports, both had positive feedback. His explanation and talk through of the import process was thorough, answering any query no matter how stupid it was. It felt as soon as the money was sent, communication dropped off. I asked for shipping updates every 2 weeks or so, not wanting to pester him, he never had any updates. I wasn't informed the car had been dropped off at the port, I only found out by his Facebook story. I asked for the photos taken at the port, knowing he would need some for insurance purposes. I received a few 5 second clips and that's it. When asked again, he said his staff had them. Weeks later I asked again, he tells me he doesn't have any, but does have 50 photos from the original advert. I never received them. I eventually got the documents sent via WhatsApp after I mentioned the port was requesting them. I purchased a CarVX report, to find out the vehicle is a Grade R with recorded accident damage, first recorded in 2017 when it was first auctioned. He never told me the grade, then again I didn't ask. His response was "Grade R means nothing, it wasn't chassis damage". Still, I would have liked to have been informed about it. Jon prides himself on being open and honest when it comes to inspecting cars, it's his main job doing so at the auctions for customers. When the vehicle arrived in the UK I noticed a few little cosmetic issues. It's a 21 year old car so it wasn't going to be mint condition. The side skirts are cracked on each corner and the sealant is failing. The front grill on the bonnet/hood isn't secured very well, mounting studs are missing. Both minor things, but again, it would have been nice to be told. During a Facebook Live walk around video of the vehicle, he mentioned it has a front Whiteline anti roll bar/sway bar. While on the inspection ramp, I noticed the stock item has been installed. When first questioned, his response was "the ARB? Switched? Since when, it never had them". Since sending video and photo evidence I've not received a response. I'm probably being over critical of the overall condition of an old car, but all I wanted was honesty (which he claims to have). I'm aware I wasn't his only customer, he's busy doing XYZ but other reviews praise him for great communication with regular updates and photos, I felt I didn't receive the same treatment. 
×
×
  • Create New...