All,
So, I'm having some slightly weird stuff going on with my car. I initially thought it might be an indicator of the MAF starting to go south, but now I'm thinking that it's actually either (a) the diverter valve or; (b) not a problem at all.
Basically, there's what feels like quite a bit of turbo lag that I never noticed before, sometimes followed by a really strong surge, and I'm not sure where it's coming from. I've been running the car chipped with a hyperboost DV for about 1,000 miles or so, and with a new TT turboback for about 300. My best guess is that it started after the turboback install, or at least that's when I started noticing it.
I tried roadsleeper's (Adrian's) MAF cleaning thing, and it didn't seem to help much, although it didn't seem to hurt anything either.
This weekend I installed an AEM CAI, and I noticed something really paculiar that I'm just not sure is right, and that I'm hoping is the source of my problem (lag, absence of proper boost).
Here's the deal -- I'm comparing this to another guy's car (BrandonC) which has an open element intake. Although not exactly the same as the CAI, it seems to me that it should be a pretty good comparison. I rode in his car before I got the CAI.
Anyway, when I accelerate, I get this very, VERY definite wooshing sound from the CAI, followed by the big (and I think normal) PPPPSSSSSHHHHHTTTT when I let off the gas to shift. When I accelerate hard, the noise seems to be a bit less, and when the noise is less, the car seems to pull much harder. It's possible that at hard acceleration I'm just not hearing it as much because of the engine noise.
It's like this:
sssssssssssssssssssssssshhhhhhhhhhhhhhhhhhhhhPPPPSSSSSHHHHHTTTT
I don't remember hearing this in Brandon's car, just the PPPPSSSSSHHHHHTTTT part at shift points. However, I guess I wasn't really listening for it, though.
Is it possible that I'm venting boost when I shouldn't be? I mean, it seems to me that the wooshing sound could be one of two things -- either the car breathing heavily (e.g. sucking air *in*), or venting off boost. If this is the case, I imaging the DV would be the place to look, right? Basically, I guess the question is, should I actually hear the CAI while accelerating?
Anyway, thanks for any info. I hope this is it!
--Jim.
[Modified by feckman, 3:37 PM 8-5-2002]
So, I'm having some slightly weird stuff going on with my car. I initially thought it might be an indicator of the MAF starting to go south, but now I'm thinking that it's actually either (a) the diverter valve or; (b) not a problem at all.
Basically, there's what feels like quite a bit of turbo lag that I never noticed before, sometimes followed by a really strong surge, and I'm not sure where it's coming from. I've been running the car chipped with a hyperboost DV for about 1,000 miles or so, and with a new TT turboback for about 300. My best guess is that it started after the turboback install, or at least that's when I started noticing it.
I tried roadsleeper's (Adrian's) MAF cleaning thing, and it didn't seem to help much, although it didn't seem to hurt anything either.
This weekend I installed an AEM CAI, and I noticed something really paculiar that I'm just not sure is right, and that I'm hoping is the source of my problem (lag, absence of proper boost).
Here's the deal -- I'm comparing this to another guy's car (BrandonC) which has an open element intake. Although not exactly the same as the CAI, it seems to me that it should be a pretty good comparison. I rode in his car before I got the CAI.
Anyway, when I accelerate, I get this very, VERY definite wooshing sound from the CAI, followed by the big (and I think normal) PPPPSSSSSHHHHHTTTT when I let off the gas to shift. When I accelerate hard, the noise seems to be a bit less, and when the noise is less, the car seems to pull much harder. It's possible that at hard acceleration I'm just not hearing it as much because of the engine noise.
It's like this:
sssssssssssssssssssssssshhhhhhhhhhhhhhhhhhhhhPPPPSSSSSHHHHHTTTT
I don't remember hearing this in Brandon's car, just the PPPPSSSSSHHHHHTTTT part at shift points. However, I guess I wasn't really listening for it, though.
Is it possible that I'm venting boost when I shouldn't be? I mean, it seems to me that the wooshing sound could be one of two things -- either the car breathing heavily (e.g. sucking air *in*), or venting off boost. If this is the case, I imaging the DV would be the place to look, right? Basically, I guess the question is, should I actually hear the CAI while accelerating?
Anyway, thanks for any info. I hope this is it!
--Jim.
[Modified by feckman, 3:37 PM 8-5-2002]