Show full size 924Board.org
Discussion Forum of 924.org
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
 Technical FAQ924 FAQ (Technical)   Technical924 Technical Section   Jump to 924.org924.org   Jump to PCA 924 Registry924 Registry

UK 1980 Series 1 Turbo project
Goto page Previous  1, 2, 3, 4  Next
 
Post new topic   Reply to topic    924Board.org Forum Index -> General Discussions
View previous topic :: View next topic  
Author Message
Carrera RSR  



Joined: 08 Jan 2010
Posts: 2309
Location: Somerset, UK

PostPosted: Mon Jan 11, 2010 8:25 am    Post subject: Reply with quote

joejax wrote:
Wow! OK, those pics should definitely end the all white or red/white battle.
Reminds me of a Vic's Secret catalog. Question,(I may not have been paying attention)what is that keyhole thing behind driver's door handle?


OEM alarm system activation. I have no idea if mine is still wired in or works. Very unlikely.
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
Back to top
View user's profile Send private message
ideola  



Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI

PostPosted: Mon Jan 11, 2010 8:26 am    Post subject: Reply with quote

Next thing I would do is a full check of the lifter clearances and the ignition timing. Who knows the last time the clearances were checked.

Does your boost gauge have a vac reading too, or only boost? The other thing I would be checking are for boost leaks. There are a bunch of rubber elbows that are prone to cracking and causing boost leaks as follows:
  • elbow at head breather plate (I noticed your car has the S2 breather update)
  • elbow from POV (these are NLA from Porsche)
  • elbow to vac limiter
  • elbow from AAV
  • elbow from tube under hard pipe to vac limiter
  • elbow from back of mani
  • the S2 has an additional elbow from charge tube, while the S1 has an 18x26 straight pipe coming off a metal tube from the charge tube
  • There is also a straight 18x26, 48mm section to AAV

These are the primary larger diameter vac hoses that can leak. Of course, there are a bunch of 4mm ones as well, they should all be replaced, as they are likely to be cracking and leaking. No point going any further on tuning until you've replaced them and eliminated vac leaks as a potential source of problems. You should be seeing ~14 Hg at startup, closer to 18-19 Hg once fully warm if everything is well sorted. After fixing any vac leaks, valve clearances and ignition timing will also contribute to low vac readings.
_________________
erstwhile owner of just about every 924 variant ever made
Back to top
View user's profile Send private message
ideola  



Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI

PostPosted: Mon Jan 11, 2010 8:28 am    Post subject: Reply with quote

Also check the main rubber bellows from the bottom of the AFM to the turbo inlet. These can often crack around the clamp seal.
_________________
erstwhile owner of just about every 924 variant ever made
Back to top
View user's profile Send private message
Carrera RSR  



Joined: 08 Jan 2010
Posts: 2309
Location: Somerset, UK

PostPosted: Mon Jan 11, 2010 8:45 am    Post subject: Reply with quote

ideola wrote:
Next thing I would do is a full check of the lifter clearances and the ignition timing. Who knows the last time the clearances were checked.

Does your boost gauge have a vac reading too, or only boost? The other thing I would be checking are for boost leaks.


Thanks for the pointers.

The head was fully rebuilt by the previous owner. He had access to the Porsche Tech Manual and worked as a sports car technician. He told me the valve clearance was done at rebuild and rechecked prior to my purchase. The clearances can be adjusted at 0.005 intervals if I remember correctly and they should be set on the loose side rather than tight. All water pipes were replaced in full but not all vacuum hoses. I have some spare with the car so will start to replace. The fuel metering head was replaced and set up. As was the fuel pumps, lines and injectors. The timing was also done. All fluids were drained, flushed and replaced during rebuild, also a month before buying oil and water were all replaced. Although all this work was carried out I cannot be 100% of its current state. Boost gauge is a 1 bar TIM which I believe displays vacuum and boost. It did not show anything below 0. Sorry I'm metric so Hg means nothing to me.
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
Back to top
View user's profile Send private message
ideola  



Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI

PostPosted: Mon Jan 11, 2010 9:25 am    Post subject: Reply with quote

The elbows are not water hoses, they are part of the intake / boost track, and unless they were replaced, they are highly susceptible to leaking. Given that the one is NLA, I doubt that they were replaced.

The lifters adjust in .05 increments, I would still have them verified.

14 Hg is 14 inches of Mercury = 355mm of Mercury
19 Hg is 19 inches of Mercury = 482mm of Mercury

If your boost gauges reads zero off boost, then it is only a boost gauge. Most boost gauges will be set up in either bar or psi, but I've rarely seen a metric Hg gauge, their almost always in inches of Hg.
_________________
erstwhile owner of just about every 924 variant ever made
Back to top
View user's profile Send private message
Cedric  



Joined: 27 Aug 2004
Posts: 2600
Location: Sweden

PostPosted: Mon Jan 11, 2010 7:25 pm    Post subject: Reply with quote

Carrera RSR wrote:
Cedric

I've watched your videos on youtube over Xmas. Your rpm comes on much quicker than my car. Please tell me more of what engine work you have done.

Also tell me more about your gauges especially the knock sensor. I am wading through the tech stuff on this forum. Lots of threads but only a few are relevant to my needs. So sorry if you have posted this before.

As a thanks here are some more pics.

[img]http://farm5.static.flickr.com/4069/4255381840_4a2c56bc46_b.jpg[/img.]

[img]http://farm3.static.flickr.com/2778/4255378860_1c38ef3713_b.jpg[/img.]



wow, your car looks so neat. I wishe mine looked the same, would be so much less work to do:)

I have an s2 egine in my car, which means higher compression and digital ignition. I dont know which of the vids you seen but the only one with a working engine is the trackday at Mantorp. I have had problems with knocking all summer, so i couldnt go for max boost until the last event of the year

The knock sensor i use is a TurboXs knocklite. It probably saved me from blowing my engine apart. The engine have had knock problems all sumemr long as i said but after changing the ignition module(which f' up the timing and rev counter) and wur the knock is now gone. Although the car runs to rich at high revs, that will be a problem for the forthcoming season. The knocklite is hooked up to a standard Bosch knock sensor which is fastened under the intake on the engine block. There is a empty threaded hole there just waiting for a sensor:). The sensor also works like i a shift light if you want that. I have more pictures of the installation if you are interested. I really recomend this device since it really can save your engine if somethings failing.

I also recomend borrowing a wide band lambda sensor if you know somebody that has one. This reveals alot.

The panel i built used the center speaker grill as base. I then glued on a sheet of aluminium and covered it with leather. The two guages besides the knocklite are oil temp and boost pressure. Most important and easy to fix imo. The oil temp sender is placed in a threaded hole in the oil plug and works really nice.

A bad pic showing my panel, tried to keep it clean and stock-look. (would really like a new boost guage some day)

_________________
1980 924 Turbo
www.instagram.com/garagecedric/
Back to top
View user's profile Send private message MSN Messenger
Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1353
Location: Washington DC area

PostPosted: Tue Jan 12, 2010 3:14 am    Post subject: Reply with quote

Another possibility is that one or more cylinders are running too lean. Do a plug check for color after a boosted run.
Chuck
_________________
1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
Back to top
View user's profile Send private message
Carrera RSR  



Joined: 08 Jan 2010
Posts: 2309
Location: Somerset, UK

PostPosted: Tue Jan 12, 2010 3:54 am    Post subject: Reply with quote

Thanks guys. Just booked it into an independent Porsche specialist in two weeks time for a check up. I'll check all pipe work in the meantime and report back on outcome. Only problem is this guy does a lot of modified work so he might relieve me of a few £££'s on some new kit.
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
Back to top
View user's profile Send private message
Martijnus  



Joined: 29 Dec 2006
Posts: 2019
Location: Netherlands

PostPosted: Tue Jan 12, 2010 4:12 am    Post subject: Reply with quote

wow! unbelievable!
_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment
Back to top
View user's profile Send private message Send e-mail MSN Messenger
Carrera RSR  



Joined: 08 Jan 2010
Posts: 2309
Location: Somerset, UK

PostPosted: Sat Jan 16, 2010 3:31 am    Post subject: Reply with quote

Ordered all the elbows (£3 - £5 each) and also air box straps (£20 each!!) from Porsche this week. Will be arriving next week. Had a play today as I had some spare 4mm hose and started replacing with new clips. Some of the 4mm had been attached using zip ties!!. Had a look at some of the elbows and you were right Dan, several have started to crack but not right through. Run out of 4mm and need some more sections so will order tomorrow. Hope to get them before going to JMG next Saturday so I can get it all checked over and running smoothly on departure.

http://www.jmgarage.com/modify/modify-924.htm
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
Back to top
View user's profile Send private message
ideola  



Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI

PostPosted: Sat Jan 16, 2010 3:48 am    Post subject: Reply with quote

Jon Mitchell is the man, from what I understand. He promised a while ago to send us a document detailing some porting info on the 931 head. Would love to see if you could wring it out of him!!!
_________________
erstwhile owner of just about every 924 variant ever made
Back to top
View user's profile Send private message
Carrera RSR  



Joined: 08 Jan 2010
Posts: 2309
Location: Somerset, UK

PostPosted: Tue Jan 19, 2010 9:45 am    Post subject: Reply with quote

Although the tyres on my car are showing good tread depth they are now 9 years old and showing signs of cracking and side wall bulges. New tyres are needed very soon. As I'm running the stock 6j x 15's for the near future I am looking at Pirelli P6000 or Toyo Proxes in 205 / 50, 55 or 60 x 15's. Apart from the speedo and top speed issues any comments on going for this width with 50, 55 or 60 section tyres. Any recommendations? The car will be lowered on new suspension in the near future as well.
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
Back to top
View user's profile Send private message
pocketscience  



Joined: 23 Apr 2006
Posts: 1650
Location: Sydney, Australia... mate!

PostPosted: Tue Jan 19, 2010 11:17 am    Post subject: Reply with quote

Cédric wrote:
The panel i built used the center speaker grill as base. I then glued on a sheet of aluminium and covered it with leather. The two guages besides the knocklite are oil temp and boost pressure. Most important and easy to fix imo. The oil temp sender is placed in a threaded hole in the oil plug and works really nice.

A bad pic showing my panel, tried to keep it clean and stock-look. (would really like a new boost guage some day)


Interesting dash Cedric. This is the boost gauge I'm planning to use, probably in place of the standard clock. I'm planning on going so fast time will be irrelevant...



Sorry for the diversion...


G.
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911
Back to top
View user's profile Send private message Visit poster's website
ideola  



Joined: 01 Oct 2004
Posts: 15548
Location: Spring Lake MI

PostPosted: Tue Jan 19, 2010 11:32 am    Post subject: Reply with quote

pocketscience wrote:
I'm planning on going so fast time will be irrelevant

Gavin, I think you've found your new signature quote for the 2010 season. Nice
_________________
erstwhile owner of just about every 924 variant ever made
Back to top
View user's profile Send private message
tuurbo  



Joined: 08 Aug 2007
Posts: 1446
Location: East Windsor, New Jersey

PostPosted: Tue Jan 19, 2010 11:50 am    Post subject: Reply with quote

Man that's a truly beautiful car.
_________________
1980 924 turbo, MSD, Meth. Inj, otherwise stock.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    924Board.org Forum Index -> General Discussions All times are GMT + 10 Hours
Goto page Previous  1, 2, 3, 4  Next
Page 3 of 4

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group