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+--- Thread: limited boost out of t25 (/showthread.php?tid=5903)
limited boost out of t25 - zx_volcane - 30-08-2012
as per title
peaking at 20psi
been on the hunt for boost leaks, can't see any, everything is tight, soapy watered ..etc
Only thing i've done is pull the turbo and remount since the hotside clamp lost a bolt and was starting to make a bid for freedom.
Also fitted egt sender
Turbo looked ok
Didn't replace the manifold gasket (steel), but had only been on the car about 200 miles - although can't see any obvious blowing and everything is nipped up tight.
MBC is wound right in.
Soooooo
I'm sure it was running over 20 before all this.
Turbo knackered / manifold gasket leaking / egt prob somehow causing a restriction
Any ideas, as I'm fed up of going under the bonnet
*edit
Its probably the gasket isn't it :/
RE: limited boost out of t25 - Jenkosowls - 30-08-2012
Itl be a gasket or still a leak some where. Does it hold boost fine? Or does it fluctuate quick thing to do to make sure actuator ain't to blame is to cable tie the wastegate if it boosts over then the actuator is faulty.
RE: limited boost out of t25 - 4WayDiablo - 30-08-2012
Could be wastegate creep or similar if you have ruled out leaks
RE: limited boost out of t25 - zx_volcane - 30-08-2012
Holds a steady 20 psi
Actuator seems nice and stiff
If I over fuel it I can squeeze one or two extra psi - so don't think its wastegate creep
Will change the gasket next week and see whats up - getting pretty pro at yanking out turbos these days with all this practise
RE: limited boost out of t25 - con67 - 06-09-2012
When this happened to me the ball was pitted in the mbc have you tried without the mbc?
RE: limited boost out of t25 - zx_volcane - 06-09-2012
(06-09-2012, 06:59 AM)con67 Wrote: When this happened to me the ball was pitted in the mbc have you tried without the mbc?
worth a shot isn't it?
RE: limited boost out of t25 - Dave - 06-09-2012
My MBC gave me no end of trouble on my turbo, until I realise that was cause of issue.
Your situation here is very similar to another one I know, and were still baffled by it, replaced turbo/checked all intake pipes/exhaust etc still only boosting just over 20psi. I know this dosent help though lol
RE: limited boost out of t25 - zx_volcane - 06-09-2012
Unplugged the mbc - still no joy
Have amassed 4 different turbos that are lying around now, so will prob just get another one instead and replace the gasket at the same time.
I'm kinda convinced its the gasket now as you can see on the new steel one that they have a raised outline that presumably crushes to fill in any imperfections for a one shot use.
Soon as I get a day off I'll sort it.
RE: limited boost out of t25 - silverzx - 06-09-2012
I hope that isnt the case as they cost a 5'er a go!
RE: limited boost out of t25 - RadiationBeta - 10-09-2012
I have recently had my turbo off and used the same steel gasket and its fine. Can your turbo suck in enough air to make the boost? What is your intake piping like?
RE: limited boost out of t25 - zx_volcane - 10-09-2012
Right had the turbo off again.
My guess is now at weak actuator.
Can pull it about by hand pretty easy, compared to other actuators I have lying around which are quite stiff.
RE: limited boost out of t25 - strictly_perv - 10-09-2012
I swear some people have fitted the T2 ones on T25's, that may help, if not crack out the welder!
RE: limited boost out of t25 - zx_volcane - 10-09-2012
I'm cracking out a different turbo
Would have had it on today but having a mare trying to get an oil feed made up with an m10 banjo on the end, been to 3 hydraulic places with no joy :/ ffs it can be done!
RE: limited boost out of t25 - strictly_perv - 10-09-2012
(10-09-2012, 08:26 PM)zx_volcane Wrote: I'm cracking out a different turbo
Would have had it on today but having a mare trying to get an oil feed made up with an m10 banjo on the end, been to 3 hydraulic places with no joy :/ ffs it can be done!
I take it it's not another T25 going on?
RE: limited boost out of t25 - zx_volcane - 10-09-2012
(10-09-2012, 08:28 PM)strictly_derv Wrote: I take it it's not another T25 going on?
It may go back on the silver one, but I've got a new toy for the black one
RE: limited boost out of t25 - CJ_Derv - 12-09-2012
You wont be dissapointed lol
RE: limited boost out of t25 - zx_volcane - 12-09-2012
(12-09-2012, 12:17 PM)CJ_Derv Wrote:
its not the td04
- thats for the silver one (this is getting confusing)Think they tried to deliver the adaptor plates today, but they didn't bother ringing the door bell and I've got a card.
RE: limited boost out of t25 - CJ_Derv - 13-09-2012
(12-09-2012, 03:34 PM)zx_volcane Wrote:(12-09-2012, 12:17 PM)CJ_Derv Wrote:
its not the td04
Think they tried to deliver the adaptor plates today, but they didn't bother ringing the door bell and I've got a card.
ahh im easily confused lol, ahh good at least they left a card i use these a lot and havent had a problem let me know if any problems bud
RE: limited boost out of t25 - Olly_p - 04-11-2012
did you ever get you turbo above 20psi im having the same problem only reaching 22psi
RE: limited boost out of t25 - zx_volcane - 04-11-2012
Weak actuator
RE: limited boost out of t25 - Olly_p - 04-11-2012
what are you running now
RE: limited boost out of t25 - zx_volcane - 04-11-2012
Lol, I'm several turbos beyond now
Re: limited boost out of t25 - Olly_p - 04-11-2012
Ahhhh fair one