Quote:
Originally Posted by vstech
amazingly powerful vehicles with the alda off aren't they... congratulations! the problem with it off is all the black smoke and the speeding tickets. with fuel prices creeping higher and higher, I'd hook it back up, after the line is confirmed clean... I might open her up a 1/4 turn though.
I think all the turbo diesels have the obp valve... the line that's going to the other place should be going to the flying blue saucer... and it's job is to boost vacuum signal to the transmission for shift stability. I'll check my parts car 93 to be sure...
I would not test the alda, I'd test the pressure line feeding the alda to be CERTAIN it's totally clear of gunk. you have a boost gauge, if you are going to drive without the alda, you shoud invest in a pyrometer.
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VSTech: Thanks. I don't think the 93 has the same plumbing as the 90-91 models do. Not sure about the 92, from me reading things changed around that time. I'll be waiting for you to peek at your 93 and see if you agree or not. I don't have the blue saucer as you mention. I've read about that and my 91 parts car has that but my 93 plumbs the ALDA differently
AFAIK anyway (heck maybe it's already been changed, that is possible too I guess). I also have been looking at some FSM vac diagrams that outline the ALDA circuit too and it seems some (late 92 onwards) agree with my statements. disclaimner there is the diagrams aren't the best labeled for my specific model year just the 602.96 motor. Mine should be the 602.962 so read that with caution I guess.
My ALDA was originally plumbed as I tried to describe in an earlier post. From the intake, it is T'd. One arm goes to the ALDA nipple, the other goes to the battery side and that pressure to electronic sensor. That's it for the ALDA pressure lines. I think the older models (90-91) have an additional circuit that goes from the intake, to the switchover/overboost protection (obp??) then back to the ALDA. At least I think that's the case. My assumption was this was controlled via the computer in the 92-93 and that pressure switch with the ultimate control being the turbo/vac wastegate as installed in the factory original set up. That control this is irrelevent now with my set up. As for the blue saucer effects on the transmission vac, I don't understand how that is accounted for in the 93 so worried I don't fully understand things here.
After sleeping on it a night, I am really contemplating whether I can get away (SAFELY for the motor) with leaving the ALDA off. If I have a reliable boost relief line (to the wastegate actuator, that relieves boost at 14 psi as GSXR's design does), I am thinking I should not be in an overboost situation. But again, I am all ears on further advice if I am not fully understanding the system and risks. As for smoke, don't care
just want the car to run well and safely.