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darkhorse
Monza


Joined: 24 Feb 2019
Posts: 224
Location: under the car


PostPosted: Tue Jan 14, 2020 9:24 pm    Post subject: Reply with quote

Another update on this. I wasn't getting boost correctly at all, so did a boost pressure test. Found a leak between a coupler, but more importantly the intercooler I replaced was p*ssing air out...!!!
So I took the intercooler off RH or OS in the UK and directly tested it. It was like trying to pressurise earths atmosphere Hand

So, luckily I had ordered one from autodoc as I didn't know kozzi was going to kindly send me one at that time. It was about £350 which is a lot cheaper than from OPC and its identical. I fitted that as I was going to return it, boost pressure test up to 25psi. Held like a beast.

On to more test drives... whooooaaa steady on cowboy Mr. Green very rapid but there is a slight hesitation when its floored hard WOT, no fault codes which is a pain .
Its fine in normal driving or if gradual throttle is applied t *its been mapped as it was doing 20psi).I have been speaking to a very well respected 996/997t tuner in the USA who has been very helpful and going through the logs.

I am investigating at present and going through stuff but first on the list is O2 sensors as lambda is a bit funky on one bank. Fuel pressure is 3.5 bar at idle. No vacuum leaks.
I have been running it with live logging and will update when I get to the bottom of it. Done about 100 miles in it since it was back together, drives beautifully apart from this final niggle, will be happy to be scorching round in it in Summer
 
  
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darkhorse
Monza


Joined: 24 Feb 2019
Posts: 224
Location: under the car


PostPosted: Mon Jan 20, 2020 11:56 pm    Post subject: Reply with quote

Pleased to report the car is now running at 110%.
It turns out after replacing the O2 sensors the car is running and driving like new; well, quicker in fact as it is mapped. I also replaced the Postcat O2 sensors for good measure as the heat insulation was torn on one of them and a wire was exposed.
So 4 new Bosch Lambda sensors (pre cat with blue lead, post cat with black lead) and all was very well in the 997 turbos world.
Just goes to show, how funky a bad O2 sensor can make a car behave (think backfire and bad hesitation under WOT!). I anticipate this as being the last post to this thread. Any further jobs I will start another thread as this full refresh/rebuild is now complete.
 
  
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Gazc2
Watkins Glen


Joined: 08 Nov 2003
Posts: 2133
Location: Perthshire


PostPosted: Tue Jan 21, 2020 9:10 am    Post subject: Reply with quote

Excellent result DH after all your efforts not cheap those bloody 02 sensors I have replaced all mine with the new exhaust I fitted, time to go and enjoy it now Thumb
_________________
2007 997 Turbo & 924s Restored
1990 964 C2
1989 3.2 targa
1987 3.2 Cab
1986 3.3 Turbo
1986 944 2.5 (later fitted with a 2.7 after wife went scuba diving in a flood and popped a piston through the block)
 
  
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darkhorse
Monza


Joined: 24 Feb 2019
Posts: 224
Location: under the car


PostPosted: Tue Jan 21, 2020 1:53 pm    Post subject: Reply with quote

Gazc2 wrote:
Excellent result DH after all your efforts not cheap those bloody 02 sensors I have replaced all mine with the new exhaust I fitted, time to go and enjoy it now Thumb

Cheers Gazc2 Thumb
I've been looking at some upgrades now... must resist lol
 
  
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fastlowe
Trainee


Joined: 22 Feb 2009
Posts: 78
Location: Norwich


PostPosted: Thu Jan 23, 2020 5:13 pm    Post subject: Reply with quote

Really enjoyed this thread, thanks for making the effort to put it on the forum. Soon be spring for you to enjoy all that work !
_________________
997.2
997.1
944 Turbo
 
  
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darkhorse
Monza


Joined: 24 Feb 2019
Posts: 224
Location: under the car


PostPosted: Fri Jan 24, 2020 11:32 am    Post subject: Reply with quote

fastlowe wrote:
Really enjoyed this thread, thanks for making the effort to put it on the forum. Soon be spring for you to enjoy all that work !


Thanks fastlowe. Hopefully it will spur someone else to do their own work rather than get their wallet emptied by an Indy garage or OPC. Appreciate not many will go to these lengths but it shows what can be done with axle stands, an engine crane and a few jacks. All paying off now though, I can't stop driving the car , love it Very Happy
 
  
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