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I've got an issue with erratic fuel pressure. I've got a walbro 340, adjustable pressure reg, electric gage. at idle I can set it with vac line off at 42 psi, then off and on with the line a few times and I can get it to read anywhere from 38 to 48 psi. When I'm driving around I've seen it go...

Been troubleshooting an issue where the car will surge up and down at mid boost, (10 PSI or so). If I hold the throttle in this boost range it's very noticable, not as much when at WOT and just go across this zone, but my AFR is real erratic 'til I get into 2nd gear at WOT. Just installed...

I'm having some surging issue's at mid boost part throttle. I pulled off the down pipe and inspected the waste gate (best I could) and the plate is loose on the shaft. Is that normal? Looks like it closes all the way best I can tell, but noticed the plate was actually free to move around a...

Having an issue where I get some surging while part throttle under boost at about 8 to 11 psi. WOT you don't really notice it but if you look at my powerlogger scan there's a bit of it going on. When holding part throttle it will boost will be up and down and few PSI, MAF up and down too. I...

Anyone running the Turbo Tweak 6.0 and closing the loop with an LC1 wideband? Is it working well? Does it hit the AFR setpoint pretty well? Any issues? Sounds like the way to go from what I read on TurboTweak site. I have an LCI and Powerlogger with 60lb injectors and TurboTweak chip that I...

Got my WideBand O2 in, and I get a major lean spike pretty close to the shift b/n 1st and 2nd. You can actually feel the car stop pulling when the O2's go up to 20 or so. It's probably like that for maybe a full second. Then back to normal and pulling hard. Seems like this is apparent only...

I pulled the downpipe and one of the bolts that attaches the downpipe to the turbo housing was a bear coming off, and a couple threads are sheared off. Anyway its a stock downpipe and stock turbo, and I'm looking for new bolt/bolts. Anyone know if I can get these from GM, if so what's the part...

Can you make a recommendation for me on new injectors and chip. Check out my sig. I don't really plan on upgrading the turbo, but I do want to get this car to run 16-18 psi of boost w/ 92 octane. I don't race it a lot, but may hit the track again someday. I'd like to get in the 12.5 sec range...

I've had some feedback that the stock chip has 24 degrees timing and that is too much for 92 octane. Thoughts? I've never been able to push more than 10 psi without getting some knock on 92 or 93 octane. Put in higher octane and I can push about 17 psi, so I know it's not false knock. O2's...

I'm looking pretty hard at running a mix of e85. I've got '86, w/ MAF Translator v5.2, Walbro 340, adj regulator, stock size injectors, stock chip, boost gage, and knock sensor. Ok. I've never really been able to run over 10 psi boost on 92 octane. I sart getting knock. Put in some Koch...

Is there a kit of sorts necessary for installing a mechanical oil pressure gage, or do you typically get what you need with the gage? And, what's the procedure like? Will be going on an 86 gn. I haven't looked things over real close, thought i'd check here first.

Interested in upgrading the audio in my GN in the near future. Here's my objective: 1. I listen to mainly rock music. Not all that loud, but like to crank it up once in a great while. 2. T-Top Car, like to be able to hear the music when tops are off and crusing down the road. 3. Want to...

Debating on pulling my motor and rebuilding it or acquiring a rebuilt long/short block and swapping it in. I get a nasty big ol' couple of knock's at idle on cold start up and on occasion when warm, that I cannot seem to chase down. Anyway, looking for input on what should be upgraded above...

I can't get into GNTTYPE.ORG. Anyone got the scoop? Sorry if this isn't the place for the question, but there are a lot of tech links to that site and figured someone would know what's going on. I'm looking for the IAC reset procedure and documents related to setting the TPS at idle as well...

Installed new Walbro 340 w/ wiring kit yesterday. Running 11 PSI boost and 93 octane, and still getting about 3.5 degrees knock retard. O2's are at or a bit above 800 for the most part.

I'm working on getting rid of the knock retard I see at only 10 psi of boost. 92 octane, o2 volts around 800 to 820 at wot. Some time ago I put in some 110 octane and the knock does go away. So I'm assuming it's not false knock. But what's up? O2's seem plenty high, and I still get this...

I'm running about 12 psi boost, 92 octane, and getting some KR at WOT, and O2's a bit under 800. Put on an adjustable Fuel pressure regulator and adjusted the pressure up. I dial static up, no problem, but WOT fuel pressure will go to 52 and that's it. So I put static at 40 psi, and it go's...

When I connect to my '86 gn with an OTC 2000, and select model year 1986, I do not get any readings for Knock or Knock Retard. However I today I tried selecting model year 1987, and I get both. Are they valid readings? My knock retard shows as high as 13- 15 half way through 2nd gear not even...