rome

Going too far...I don't think so.

I did my suspension and top end at the same time (a couple weeks ago). I preferred not to have my car laid up when the nice weather rolls around in a few months.

Here is the link to the thread. https://rennlist.com/forums/showthre...ferrerid=34752
There is a lot of discussion about the merits of a top end. I have to say, I notice a difference. (My car is a C2S NA, but I'd imagine the results would be equally good for a TT). The engine is much, much smoother, and the shifts are really silky now (even, for e.g. down shifting into 2nd). See post #42 in the above thread for the write up.

gary11

Forgive my naivet (got car dealer head on for a minute) regarding these leakdown tests? if you have got to remove turbos to get a conclusive verdict how does that lay with the vendor,I wouldnt agree to a test of this nature removing turbos on a 12yr old car is enough of a problem(as Kevin recently told me)when you have to do it let alone just to reasure new purchaser,how many of the stripdowns result in sheared bolts ect and further expenses,as you wouldnt put it back together with worn components would you?
what sort of money are we talking?

lucycan

Takes a good mechanic about 2 hours for a full leakdown.

Its no more difficult than a plug replacement. In fact, a good time to do such a thing.

I have paid anywhere from $250 to $450 for a complete PPI with a leakdown.

Kevin

You do not need to remove the turbochargers to do a leakdown. As Jason just mentioned, it is a good time to do when they are replacing the spark plugs. If I was the customer I would be sitting at the shop and asking to see the number 5 and 6 plugs and leakdown results in real time.

To inspect your valve guides and ceramic port liners and at the same time one would and could replace the valve cover gaskets, one would have to remove the turbochargers.

bb993tt

I just did exactly as Kevin is describing here. If for no other reason, it was very interesting to see how difficult numbers 5 and 6 were to remove. Replaced all the plugs at this opportunity.

LAT

I paid 3.5 hours two weeks ago for a leakdown with pictures on my new 993 Turbo.

Results as you can see 5 cylinders were 2-5% one, #6 was 8%, all were exhaust leaks. Engine has 33K on it.

After adjusting valves, solid lifters, we retested #6 and it was 4.5% not sure why the drop as valves were not too tight,maybe carbon.

I am very happy with the numbers.

lucycan

Nice pics LAT.

gary11

thanks for the replys,not as bad as I thought didnt realise either that 5/6 were prone to higher numbers,labour does not seem an issue,it was only the mention of turbo removal earlier in the post that got me wondering,by the sound of it a worthwhile test for anyone considering a purchase,I have to say Ive sold a good few 993/964/996 even an 86 flatnose se recently,and have never been asked for a leakdown test seems par for the course in US though!

Kevin

LAT do you have another picture that shows the black gauge reading to the left?

You need to calibrate it to 100 PSI and make sure that your compressor doesn't kick on or you will get a varable added to the mix.

To make myself clear, if your wrench is taking the time to show you the numbers with photo's make sure he shows you the second gauge on the Snap On unit.. I am in no way saying that it was high or low or incorrect, but one should ask to see the regulated line pressure.

gary11

am getting interested now,probably live to regret this but,my TT Is in for a service and to have oil lines fitted (with check vavlves to turbos) I havent got a snap on cyl leakage gauge but have commpression testing equipment is there a bar/psi value I could use I note the second gauge in the pics but is blury and cant read the value,is there a time scale involved for pressure loss? hmmm.

LAT

Kevin, too late for the question the car is bolted back up, this was done a few weeks ago.

I believe the line pressure you are referring to is seen in pictures of cylinders 1 & 2, both cases seems to be about 96 psi. If I follow what you are saying then 1 & 2 of the above would then indicate 4.8% (5% of 96)