Boost Saga

[BlitzBoy]

Guys update to my my boost problem saga.
Right things I\'ve done already
1. Checked Solenoids
2. Primary Air Intake to primary turbo hose
3. Y Coupling
4. Bypass, charge releif valves
5. DeCat pipe, original cat checked, In mint condition no blockage

Boost pattern when Car is cold (just warmed up) Morning 8-4-8
When warm/afternoon  5-2-5
Evening 2-1-2!!!!

We are going to check wastegate control actuator and arm (one near the front of the engine) tonight to see if its a weak spring and to see if the heat is making it stick,(as it seems the wastegate door is not shutting properly when hot.

Apart from that has anyone got any ideas of what else it could be??

[BlitzBoy]

Checked the Wastergete Actuator with a pressure line and its working fine the rod opening and snapping shut, arghhh any ideas guys?

[John Yorke]

Sounds like the dreaded \'rats nest\' - you are loosing boost due to an air leak would suggest it is a leak on a vacume hose?:confused:

[BlitzBoy]

hmmm if it was an air leak from a vacuum hose, my boost pattern would be constant irespective of heat , but boost pressure changes when heat rises. Plus I disconnected the boost solenoids yesterday to take the question on vacuum hoses out of the equation so it would run a 7psi boost pressure, but this had no effect on boost, I even disonnected the vacumm line(dangerous dont try this at home)  to the wastegate actuator which has the effect of closing the wastegate door permanently shut this evening and the most boost I got was 5psi when hot!!

So guys any ideas??? do you reckon the big Turbo Control actuator is at fault?

[Shaq]

blitzboy,

thats i real pain dude ! you still runing up the pod tho right ??

is there a way to  disconnect the safetyboost?


maybe the vacuum lines a collapsing because of the heat ?


I am prob. completely wrong but that my contribution !





Shaq

[BlitzBoy]

yep your wrong he he, when you  disconnect the solenoids, you are relying on the spring pressure in the actuators, in this case 7psi which is safety boost , so in this case im getting even less then this, which points to either a faulty actuator holding the wastegate open, but this has been checked, hmmm I only can think that the main turbo control actuator is sticking open with heat. But that is the hardest actuator to get to to test without taking loads of bits off!!yikes.
Has anyone on this forum had a problem with the main turbo control actuator before?

[BlitzBoy]

Getting the whole twin turbo pack changed over today, so that will fix bugger! lol;)

[Shaq]

cool, i hope that sorts it mate, let me know how it goes.


Shaq

[BlitzBoy]

Update!! we have found the problem, when my Mechanic started to take the parts of to replace the twinturbo pack, he noticed the bottom intercooler hose which joins an elbow then the hose to the turbos, he saw the rubber coupling connecting the elbow had a split on the bottom where the jubilee clip is, therefore when the rubber coupling gets hot it splits open leaking large amounts boost, right off to order the rubber coupling tomorrow, anyone wanna buy a twin turbo pack I now longer require lol!!!

Ps attached pic, can anyone tell me the part number PLEASE???:god

[John Yorke]

You could invest in samco hoses [ ask your mechanic if he has some] or oder it from demon twits:cool

[BlitzBoy]

hmmm that is an option, but I have hard pipes on order from America which are taken an age to arrive, so for the time being I might as well order the part to get me going,
So does anyone on here know the part number?

[bnaellis]

Don\'t mean it to come across rude but would of thought that if a rx7 had boost issues one of the first places for a mechanic to look would be there ? Can\'t you take the turbo pack back to Mazda as it\'s unused and get your money back ?

[BlitzBoy]

Well the rip was hidden underneath the Jubilee clip, so to be fair it was very hard to spot until he started to take it apart, he didnt charge me hardly anything at that point. Well the turbo pack is second hand which I bought quite cheap, so I will either keep it for spares or sell it whole.
Part number anyone for rubber coupling?

[bnaellis]

I here you,

I don\'t know the part number but this is a bit of a common boost problem so I would advise just replacing it with a piece of samco instead.

rgds

[BlitzBoy]

hee hee its harder getting Samco then mazda parts!, I tried this lunch time apparently Samco has to be  ordered and in takes 2 weeks to come in! So I fixed the coupling for the time being until the hard pipes come in and its now making full boost at 10 psi whoohoo!!!