123 Install Today - GETTING CLOSER..., PROGRESS: BAD MPS |
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123 Install Today - GETTING CLOSER..., PROGRESS: BAD MPS |
FlacaProductions |
Dec 14 2023, 09:50 AM
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#1
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Senior Member Group: Members Posts: 1,733 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California |
74 2.0 D-Jet
Heading to the garage now to start the install and my main, unresolved-in-my-brain question is if i need to hook up the vacuum line that is on my current stock distributor, on the 123. |
Rob-O |
Dec 16 2023, 11:15 PM
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#2
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Senior Member Group: Members Posts: 1,253 Joined: 5-December 03 From: Mansfield, TX Member No.: 1,419 Region Association: Southwest Region |
Okay so progress…
So I want to be sure. You set the engine to TDC. Not being funny, this has tripped up more than a dozen people in the past. If you are absolutely positive that the engine is at TDC, THEN check that dizzy drive gear to ensure it’s in the correct position. If that is correct, then drop your dizzy in and turn it until the green light. The green light is only telling you that your dizzy is now pointing at cylinder one (and since we checked TDC in step one, we know the engine is at TDC. So we have green light at TDC…so we’ll get a spark on cylinder 1 when the engine is exactly at TDC, and we know that a spark when the engine is at TDC happens too late, because the process of generating a spark and getting it to the cylinder takes time…about 8 degrees of time when we’re at idle. Will the car run (idle) with no advancing of the timing? Yup, and I suspect that’s where you’re having problems. So right now the car is idling but poorly. This is the time we’d turn the car off and then turn the key back on (but don’t start the car). Then load your app and load a curve. I’ll post a photo of my curve (1.8L, stock L-Jet). As for vacuum, I plugged mine. The 123 can use MAP but I can’t see any reason to use it you don’t need any vacuum signal for advance because, well, you have a 123 now, you just program in the advance as a more or less aggressive curve . |
914_teener |
Dec 17 2023, 05:36 PM
Post
#3
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914 Guru Group: Members Posts: 5,245 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Okay so progress… So I want to be sure. You set the engine to TDC. Not being funny, this has tripped up more than a dozen people in the past. If you are absolutely positive that the engine is at TDC, THEN check that dizzy drive gear to ensure it’s in the correct position. If that is correct, then drop your dizzy in and turn it until the green light. The green light is only telling you that your dizzy is now pointing at cylinder one (and since we checked TDC in step one, we know the engine is at TDC. So we have green light at TDC…so we’ll get a spark on cylinder 1 when the engine is exactly at TDC, and we know that a spark when the engine is at TDC happens too late, because the process of generating a spark and getting it to the cylinder takes time…about 8 degrees of time when we’re at idle. Will the car run (idle) with no advancing of the timing? Yup, and I suspect that’s where you’re having problems. So right now the car is idling but poorly. This is the time we’d turn the car off and then turn the key back on (but don’t start the car). Then load your app and load a curve. I’ll post a photo of my curve (1.8L, stock L-Jet). As for vacuum, I plugged mine. The 123 can use MAP but I can’t see any reason to use it you don’t need any vacuum signal for advance because, well, you have a 123 now, you just program in the advance as a more or less aggressive curve . Wrong, he has...or so he says D-jet it uses a speed density circuit for fuel and not air volume. How do you set a "more aggressive curve" to the needs of the engine on part load? It's dynamic and not the static timing. With stock D-jet that doesn't work very well. In the instructions the advance is cumulative from the vacuum signal. Otherwise....you will just be guessing. You could use the MAP function but why? D-jet is a hard mapped totally closed loop fuel injection system that is designed for a certain VE (Volumetric Efficiency). The OP started the thread this way, should he use the vaccum set up? Kinda blows my mind and when I used to read Jake Raby's threads here. Some of his responses were redundant. Number one thing here that I read is: It's never easy when you take a little information without the benefit of experience and assume it will be easy. It's a set up to ignore things and information you should be paying attention to. Never saw in the thread whether or not the timing notch was correctly lined up. Since it was compared to someone elses....maybe its okay? Did the OP skip a step....?? I think I even offered to come help but he's in Indiana and not the Los Angeles area as I understood it. Offer is still open...maybe someone else can help him out? |
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