troubleshooting modified SPG engine...(really long) - Saab 900 Bulletin Board - Saabnet.com
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troubleshooting modified SPG engine...(really long)
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Posted by Chad88SPG [Email] (more from Chad88SPG) on Thu, 5 Oct 2000 09:37:07 Share Post by Email
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I am trying to get my car running smoothly with all my new SPG9 goodies. Here's the rundown so you are on the same page as me to start:

'88 SPG - bored out .010" rebuilt 15,000 mi. ago

Stage 2 APC
RRFPR
24lb injectors
Distributor AID
big IC pipes
Stainless 2.5" cat-back exhaust
K/N filtercharger
SPG9 wastegate just put on
silicon vac. lines
Stock IC (but then Halifax is always cool and wet, perfect turbo climate...)
new NGKBPSE6's gapped .026, bougicords (removed SPG9 Firewire kit due to wild boost flutter), new bosch cap & rotor
new Centerforce 9000 clutch with lightened flywheel
20psi hooter valve

-O2 sensor functioning normally, 0.5-1 volts
-alternator cranking out over 14 at idle with all accessories on, just received external voltage regulator kit but not installed
-plugs indicate running rich(carbonized), no fuel pressure measurement capability though, RRFPR turned 4 turns past resistance point clockwise
-idles fine, fluctuates btw. 850-1000rpm
-have not tested resistance at AMM but will today

Problems:
boost still fluctuates wildly, even w/AID- shoots up to 24psi, back down to 15-16. Wastegate is set to about 5psi base boost, which seems weird that it would then shoot up that high... I would like to set max around 20 psi. What is your advice? I am pretty sure the AID pin is connected properly, as there was a great improvement in boost flutter. Is there a way to check without removing? I am afraid to try to get that pin in again...

I'm trying to connect an autometer a/f ratio gauge. I have a known good O2 sensor. When I connect the purple wire to the lead off the O2 sensor, I get no lights (one green when not connected). When I disconnect the AMM and go directly to the O2 sensor, it works fine. When reconnected, the lights go out. The wire to the AMM from the O2 sensor is very thick (10 ga) and my mechanic suggests that not enough signal comes off my splice to the a/f gauge to make it read. (I think this is ridiculous). It is through a clip-on splice which I know is not the best but I don't want to solder until I'm sure it works... He wants to tap a new O2 sensor in just for the a/f gauge. Any ideas?

He also questions the readings I will get on the a/f gauge - his point is "what is stoich?""for what compression ratio?" What if richer is better than stoich? I contend that stoich is stoich if your air/fuel mixture is good. Am I correct?

I'm in the dark here, as my mechanic doesn't really know about this stuff and I doubt anyone in Halifax does... I'm just trying to optimize this thing and don't have any help here.

Just out of curiousity, what kind of horsepower and torque would you think this vehicle is producing?

thanks for any suggestions


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