08-16-2012, 05:12 PM
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Registered User
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Join Date: Nov 2007
Location: Mebane NC
Posts: 250
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Quote:
Originally Posted by Brian Carlton
This is rather interesting.
If you measured the boost properly, and hopefully at the ALDA line, the ALDA will be seeing 13 psi boost. Therefore, there is no possiblity of clogged fittings or bad lines or any other issue other than an ALDA that doesn't respond to boost.
That being said, I find it very surprising that the turbo can actually make 13psi without the additional fuel provided by the ALDA. I would suspect that the 13 psi, if accurate, must occur very high in the rpm range............probably above 4000 rpm or more. This would indicate that you definitely are not getting the fuel from the ALDA although it does see the boost pressure from the turbo.
The fastest check you can possibly make is to simply remove the ALDA and take it for a drive. You may find that all issues disappear if the ALDA is the culprit.
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Yes Brian C, what you say is correct. see more details below, but boost is accurate as far as I can tell. ALDA line is clean. 12PSI or so, at 3000 RPM. I feel as you say, ALDA is not responding or if it is there is no impact for some reason.
- My boost gauge is ported into the intake manifold at one of the unused plugs just forward of where the ALDA line takes it's pressure signal (but not the ALDA line itself). I believe my measures are accurate.
- I am running the gsxr wastegate mod pressure line also from the intake but that line I have T'd into the ALDA supply line (I saw others do this, seems fine all connections are clamped down, good hose etc.
- Thus as Brian C mentions, the ALDA has to be seeing the same pressure as my boost gauge (not that is matters but so is the wastegate pressure actuator line since it is T'd here).
- I had previously removed the port fitting on the intake that supplies the ALDA pressure and made sure it was cleaned from the intake gunk. It had the typical intake goo but was not clogged , but I cleaned it out good as well as the tubing going to the ALDA. It seems to me that the ALDA has to be getting 12-13 psi, no question. Whether it is doing anything with that air, that is not answered yet of course. I will remove it to see.
- Important details just in case anyone wonders if the wastegate mod I did is causing my issue: I did the wastegate mod, because I totally lost all turbo boost in the old vac wastegate/electronic control factory setup. That was my first sign of the problem with the original set up. This is NOT just post wastegate modification. Meaning I don't believe this has anything to do with my wsategate modification. I think that modifications is well done and working as it should. Without that and the OEM set-up on the turbo, the computer was not allowing any boost to happen is my guess.
- The boost is something above 10-12 psi, sometimes 13. I hvae the pressure wastegate set up so it begins to open the wastegate (dump the exhaust that is) at 14 psi. This boost is at around 2800-3000 RPM. Not sure the car will hit anywhere close to 4K RPM the way it runs. It just doesn't seem to be able to get up to the high RPM's even when not under a heavy load. Hard to describe in writing. Just a dog is the best way I can describe. I can feel the turbo helping a little at the lower speeds but not anything like it should.
- The car runs great on the flat or downhill with built up momentum and NOT up any hills. Will cruise along at 80+ mph no problem. Takes awhile (maybe 1/2 to 3/4 of a mile just guessing) to get to 80mph is the problem. Any hills, total loss of speed. Boost pressure begins to wain way down, no no throttle response whatsoever, car slows just generally feels like the engine has nothing to offer. No smoke either, not even a light puff of anything.
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