[Subscribe to Daily Digest] |
Members do not see ads below this line. - Help Keep This Site Online - Signup
I sent this message to Dynamics for help, but I want your opinions.
Here is my Setup.
1993 900 turbo Commemorative Edition with the TE05
K&N filter
Magnecore wires from SD
APC box from SD
SD Blue series injectors
Trent/Malpassi RRFPR set at 3.1 bar
Timing - 18 degree BTDC with max boost retard stop modified to achieve 8 degrees of retard (bringing timing to 10 degrees at boost)
new NGK BCP 7EV plugs at .025
93 octane always
Boost Guage
air/fuel gauge
In 2nd gear, with the new APC box, at WOT, boost will rise very quickly past 20 psi (my boost gauge only goes up to 20 psi) and then it must sense knock and gets kicked way back to 15 or so. By that time 2nd gear is over. 3rd, 4th, and 5th it goes past 20 and holds a little better but sometimes it gets kicked back to 15 or 16. My goal would be 20 psi steady. Aif/fuel gauge seems to indicate that I am getting enough fuel and timing at boost should plenty retarded enough to prevent knock.
Any suggestions? Like I said, 20 psi steady would be fine with me, not really looking for more. Fortunately, fuel cut (2.4 LH) has not been an issue yet, so I have not had to do the resistor mod.
Here was the response from SD.
Your boost fluctuation may be indicative of a few possible culprits:
1.) The base boost levels may be low for maximum targets. We suggest a 50%
base boost setting derived from maximum target (I.E.: 20 psi maximum boost
would correlate to 10 psi base boost. The TE05 turbochargers are notorious
for loosing actuator spring rate, as well. Adjustment may be made by shortening the actuator rod by unseating the actuator from the wastegate, loosening the 11mm fixing nut, and turning the end of the actuator clockwise onto the rod. Many customers opt to fully turn these inward until there is no more avail. thread and even employ additional threads via tap/die kits.
2.) Bypass valve may be causing abrupt bypass of boost pressure under maximum progression. This would correlate to a sudden taper in boost pressure. Wesuggest use of the HP bypass or similar.
3.) ignition is advanced under full boost progression. To eliminate this as being a possible culprit, adjust full boost retard to 9 dbtdc after 15 psi.
4.) Mechanical or carbon deposits creating possible detonation when the
combustion temps increase. Check the condition of your spark plugs to insure that they are a matte gray finish at their respective ends and an off the shelf fuel additive for carbon reduction has been known to help such matters.
My questions are:
My base boost is at 6 psi. I am afraid to set to 10. Has anyone using an SD APC box done this?
My timing is set correctly, this should not be causing the problem.
I have the 20psi Viggen BPV. I doubt it would leak that much boost. It is new and works fine. Could this really be the culprit? It seems like it would just blow the diaphargm.
What do you guys think? Should I set base boost to 10psi and try it?
Brian
93 900 t
posted by 65.211.6...
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.
 |
 |
 |
 |
 |
