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Old 23-05-13, 23:26   #1
burgo88
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Question anbout dose

Ok we all love dose... we are vl lovers of course thats our trademark.

ive been wondering as ive been reading mixed opinions, is dosing bad for your turbo, some say it spins the wheel in reverse dosing, however i cant agree as the exhuast is still pushing it forwards. the only stress i see on the system is to bearings possibly if anything and minimal.

i want your insight, not your mates dogs but yours and possible experiences with proof..

My vl has been dosing so to speak for 5 years on this turbo and is fine and i do push my car a little, the turbo has been orange more than once and still doses when orange and goes again staraigt away.

Reason for asking is ive got a GU patrol and ive just put a R33 GTR RB26DETT engine in and im not putting a blow off valve in (as im not a queer bird whistler) and its hard with the set up ive done and no room to plumb it back in..


I however am slightly concerened with damage as these turbos would be very hard to change in the car.....


Dayne =D
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Old 24-05-13, 01:04   #2
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I believe it does no damage at all. Been doing it for 5+ years in a a few different cars, ive ran t3, t04, 20 turbo, and a 35r. Had no problems with any of them.
Only thing i would be concerned with on a 26dett is ceramic exhaust wheels coming off if you run high boost
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Old 24-05-13, 02:56   #3
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Haha is it 2006 again or what? where's dixie these days (aside from banned).

What you are hearing is the stalling of the compressor, it's pressure coming back the wrong way, essentially resisting the motion of the compressor wheel, trying to push it back.

While this isn't physically too dangerous for the blades, it is not that good for the turbo and general airflow.

If you don't have a blow off, the compressed air being forced into the manifold has to go somewhere when the throttle body closes, so it goes back through the system the other way.

Issues could be:
vibrations (not good, ever) though probably harmonic no issues for a wheel balanced to run at upwards of 70000 rpm. Probably not that great for bearings etc.
could theoretically do damage to the wheel... but not likely...
plus a few more you could google.



It's worth pointing out that it has no benefit whatsoever to performance (obviously) and could only serve as a detriment in that it slows down and messes with the motion of the turbo, when you want a quick change to not lose much motion and have no resistance to the exhaust gasses turning the unit as fast as it can go.

Blow off would be better, even a plumb back with the tube just stuffed somewhere else would go fine, as opposed to one of the showy "look at me" PTTSSH ones.



Also the "orange" would be the exhaust manifold, thats just how hot your exhaust is, the "dose" or flutter is coming from the front half of your turbo
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Old 24-05-13, 11:49   #4
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I would ask 6boost on SAU... that guy is the God of turbo cars

I would probably PM him though, you would get a heap of **** from SAU members if you created a thread!
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Old 24-05-13, 19:18   #5
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Yeah, i understand how it all works and how the noise is generated, im after bad experiences people have encountered, ive read up and researched these standard N1 turbos as i dont like standard and 14psi is my max which is ok for a patrol i guess anyway.
it will delay reboost time due to slowing the compressor wheel dosing for sure.

damage to bearings/wheel is all im concerned about however i think ive decided to see what the dose sounds like when its wired tomorrow and then that may also may sway the decision for BOV vs DOSE.

yeah the orange is the rear wheel but when thats orange there will be huge huge heat flowing through those bearings and front wheel.

next question, has any one heard a TT 26 dose? is it gay?
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Old 24-05-13, 21:07   #6
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ive had lots of dose and no turbos go bang as a result.
i think the 2j dose is **** compared to the 25 though its entirely dependant on the turbo(s) and piping rather than the motor. im sure it will be entertaining none the less. the ceramic wheeled 26 turbos are prone to dying early deaths but at least the n1 ones are steel.
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Old 24-05-13, 22:02   #7
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A dose will only cause compressor surge. Very minimal & about the only thing wrong with it. I'm pretty sure but someone might need to confirm my myth LOL.
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Old 24-05-13, 23:11   #8
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26dett have factory bovs on cold side after cooler behind the bumper if i recall right.. so no ive never heard one dose
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Old 24-05-13, 23:24   #9
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Quote:
Originally Posted by TheChad View Post
Haha is it 2006 again or what? where's dixie these days (aside from banned).

What you are hearing is the stalling of the compressor, it's pressure coming back the wrong way, essentially resisting the motion of the compressor wheel, trying to push it back.

While this isn't physically too dangerous for the blades, it is not that good for the turbo and general airflow.

If you don't have a blow off, the compressed air being forced into the manifold has to go somewhere when the throttle body closes, so it goes back through the system the other way.

Issues could be:
vibrations (not good, ever) though probably harmonic no issues for a wheel balanced to run at upwards of 70000 rpm. Probably not that great for bearings etc.
could theoretically do damage to the wheel... but not likely...
plus a few more you could google.



It's worth pointing out that it has no benefit whatsoever to performance (obviously) and could only serve as a detriment in that it slows down and messes with the motion of the turbo, when you want a quick change to not lose much motion and have no resistance to the exhaust gasses turning the unit as fast as it can go.

Blow off would be better, even a plumb back with the tube just stuffed somewhere else would go fine, as opposed to one of the showy "look at me" PTTSSH ones.



Also the "orange" would be the exhaust manifold, thats just how hot your exhaust is, the "dose" or flutter is coming from the front half of your turbo
dixie https://www.facebook.com/toofreekinawesome?fref=ts
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Old 28-05-13, 02:19   #10
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yeah your right they have a factory bov set up but ive welded that pipe up and done with the plumb back, its running now so ill give it a drive tomorrow after modding a few more wires and i shall see what the flutter,splutter,dose sounds like =/ haha
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Old 31-05-13, 01:17   #11
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in terms of vibration I seriously doubt it will cause any issues to the components structually. given that the system is designed to run at a minimum of 60000rpm max speed, depending on the turbo some run at up to 100000+, it wont be an issue.

Given that the system has to travel in between all speeds in that range these things are so well balanced that the natural frequency of vibration would not occur in this range. due to the relationship of static deflection and whirl it is unlikely any vibrations at a frequency so low would excite any natural modes. The system as a whole would be designed better than that.

The only worry is the damage to the blades from the back and forward forces, but again they should be strong, and that the bearings are in good condition.
Theoretically it shouldn't cause any issues there.


what I mean by that is that vibrations occurring from stalling it should do no damage to the housing or bearings or the shaft etc.
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Old 31-05-13, 03:47   #12
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yeah thats what i thought, to be honest people say its bad but i dont see how so im with you on turbos are built to dose hahaaaa

either way got it running and the flutter from two turbos in a gu is a very tuff stealth sounding dose so im happy and plan to leave it with no bov.

as a update for those interested the rb26 GU is neck and neck with my missis 6l ve caprice... link ecu and a tune and ill pull away for sure! not bad for a two tonne rig on 33s hahaaa
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