1969-1984 [Subscribe to Daily Digest] |
 | [Main Saab Model 99 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Help with tuning issues, turbo swap? new owner of 99T Posted by Gary Stottler [Email]  (#1463) [Profile/Gallery]
(more from Gary Stottler) on Mon, 17 Jun 2013 19:45:52
In Reply to: Help with tuning issues, turbo swap? new owner of 99T, pavl, Mon, 17 Jun 2013 02:48:30 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Hi,
I will offer the other point of view - everyone on the BB knows I will always advise to keep it original if at all possible. Higher value if you ever want to sell it, and it runs like it originally did in 1978 which is kind of the point, yes?
Anyway, you could likely get an original wastegate from East of Sweden in Colorado, or if you can wait a coupe of weeks I can paw through my barn and see what I can find. Seems like rebuilding an original wastegate would be not too hard and it bolts right on. I might have a diaphragm also.
As far as the oil pump, they all look like that, just dress it a little and put it back on with a new o-ring. I've never measured the o-ring, but I bet McMaster will sell you 100 of them for 10 bucks once you figure out the size (I have o-rings for 100 99 water pumps....).
On the misfire/boost issue, not 100% sure there, could be a sticking wastegate, more likely ignition or fuel (see below). I always advise to start from the beginning, understand how each system works, and walk through one step at a time. Otherwise you end up jumping from one "magic bullet" to another and just being frustrated:
1) Base engine: Cylinder leakdown and compression good? Valve clearances good? Most 99Ts need a valve job if they haven't had one in the last 30K miles.
2) Ignition system: New wires, plugs, cap, rotor? Sounds like the coil and Hall Effect stuff are OK or it would not run as well as it does. Set timing 20 degrees BTDC at 3000 rpm. Vacuum and Centrifugal advance mechanisms free and working properly (mechanical advance often frozen up in the Bosch distributors)?
3) Fuel injection: Is the lambda system working properly (modulating valve buzzing, new O2 sensor?)? Can you see good O2 sensor action on the pulse relation meter? Line pressure and control pressure OK? Throttle enrichment microswitch working?
All of that stuff needs to be sorted before you worry about the turbo.
Contact me off-line if you need parts or more details. The red '75-'80 Service manual has good explanations particularly of how all the fuel inj system stuff works - worth reading up on.
Good Luck!
Gary
posted by 198.208.15...
_______________________________________ Gary Stottler
, Mon, 17 Jun 2013 19:45:52 <-- Viewing This Message, Tue, 27 May 2014 05:09:56, Mon, 2 Jun 2014 16:29:42
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
