Hi Guys,
A while back I had a lack of power problem with my Saffron 1999 C70 T5 GT, with a manual box - http://www.vpcuk.org/forums/showthre...-Boost-Problem
The last entry in the thread above I was about to change the TCV, that did not fix the problem.
Life got in the way and as the car was (still is) drivable, I put thoughts of top end power to the back of my mind.
Anyway, I had the chance to engage in a bit of diagnostic work with a local mechanic with a dyno and it does not look good.
The dyno chart looks like a normally aspirated engine, nice straight curve up to 177bhp. :-(
Boost pressure is only holding at 4 psi and there is some noticeable wear in one of the shafts. He did say that the engine itself feels good and strong, which is a bonus.
Something suggested as a possible problem is the standard dump valve, if the internal diaphragm is split then the boost pressure will not be held. I'm not familiar with the internal workings, but is this feasible?
So it is either the dump valve or turbo and I have a choice to make.
Do I take the opportunity to change cars to one with less problems? This car does have a few issues, I made the mistake of making a list... A replacement would probably be the newest, cleanest V40 I could find for a grand.
If I was to replace the turbo, where would I get one from?
I am reluctant to just buy a second hand unit with the doubt over whether it is sound and how long it would last. Where would I obtain a new or reconditioned unit, safe in the knowledge that it is not a cheap chinese knock off and will bolt straight on?
Then there is the option of sourcing a 19T rather than a 16T and using it as an excuse for a remap. Although that is further expense that I can't really afford...
I am conflicted!
It might come down to being able to source a reliable turbo to make this decision.
Alex.
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