My cars pretty much stock, but i'm hitting 16psi. Bad WG actuator?

[Gleason]

UPDATE in QUOTEs below. original problem written below the quote box.

heres an update. Got the car back today. only 1/4th tank left of 7 month old gas so i filled it completly with 93 from mobil, ran it normal driving for 10-15 minutes. then i did a 3rd gear pull, and my timing at 5700rpm is now 16degrees with it steadily increasing to 19 degrees by 6400rpm .[ still hitting 16psi ]

02 voltage is from .94 to roughly .92 at 6400rpm so i am guessing i am getting towards the limit on stock pump, because .92 is getting near the 'lean zone'. But i don't drive/race over 6200rpm anyway so i am good for now until I rewire.

I am going to boost leak test and double check my actuator lines tomorrow [ i am heading to work now, and when i get out all hardware and auto stores are closed. ]

ORIGINAL POST BELOW

My cars pretty stock. Has hard LICP, Filter attached to the MAS, UICP with 1G bov i installed the other day, and a boost gauge I have installed today. I have never messed with the boost, and the cars boost has never been upp'd by me or the previous owner.

Now, I did a 3rd gear pull when still on stock UICP and 2g bov, and my timing looked good on the logger. about 18 degrees at 5700rpm where i let off. The timing steadily increased and had no hiccups. Last night I installed the 1G bov and UICP, but didn't get any logs in. Today I installed a boost gauge and I unexpectedly saw I was hitting 16psi. I figured i'd be around 11-12 since I have never messed with the boost on this mostly stock car. I logged a pull, and my timing still steadily increases, but its only around 12 degrees at 5700rpm.

I'm thinking since the 1G bov is on, its holding boost much better than the 2g bov, but I'm still confused at why my boost is at 16psi. I've never messed with the BCS or installed an MBC before. Is my actuator faulty? I read to check/run around 7psi if the actuator is work you plug in a line from the intake manifold to the WG nipple? what line is it?

Do you think I am getting some counts of knock now because its holding the higher boost and my timing isn't peaking as high anymore?

Anything else I haven't thought off that would cause me to read 16psi on boost gauge? I will try and boost leak test it soon, hopefully will get one built tomorrow.

 

[larsrya8]

Do you think I am getting some counts of knock now because its holding the higher boost and my timing isn't peaking as high anymore?

Anything else I haven't thought off that would cause me to read 16psi on boost gauge? I will try and boost leak test it soon, hopefully will get one built tomorrow.

Are you getting any counts of knock? Check with your logger. Does the car feel faster?

The stock boost on a 2G is 15 psi, so 16 is not that far off. If you had a boost leak your pressure wouldn't be as high because it would be bleeding out through the leak. You would be overworking the turbo though, and that would result in higher air temperatures and knock.

 

[Gleason]

Are you getting any counts of knock? Check with your logger. Does the car feel faster?

The stock boost on a 2G is 15 psi, so 16 is not that far off. If you had a boost leak your pressure wouldn't be as high because it would be bleeding out through the leak. You would be overworking the turbo though, and that would result in higher air temperatures and knock.

I can't log knock, only the timing.

Stock boost on a 2g from what i've read off Eagles own site was ""11.03" psi, so basically 11-12 should be stock as far as I know.

 

[travislaw]

Do a boost leak test. You could have a small leak somewhere that is causing your boost levels to go up. With all that stuff you added, you could have easily have cause a leak somwhere in the system.

 

[greysave]

Check the vacum hose controlling the wastegate. Ensurethat it is a snug fit. Also check that hose for any leaks. If you have a boost leak leading to the wastegate actuator that could cause your boost to be higher then normal. Is it spiking to 16 psi or holding steady at 16?

 

[Gleason]

Check the vacum hose controlling the wastegate. Ensurethat it is a snug fit. Also check that hose for any leaks. If you have a boost leak leading to the wastegate actuator that could cause your boost to be higher then normal. Is it spiking to 16 psi or holding steady at 16?

holds steady. goes right to 16 and holds it till 5500 or so when the T25 cant move that much air and it starts to taper off like normal.

 

[miden]

My 99 gsx with 38k miles does just about the same thing. She builds up to about 16 and settles to 14-15 lbs.

I've got a 1G BOV, open element air filter and a 3" catback. I've checked for boost leaks up to 20 lbs and she holds (the bov starts leaking through the recirc. port about 17-18 lbs, though...). All the hoses are in good shape. I am at altitiude (5200 some feet above sea level...), but the local guys have all told me that this is normal once you make even the simple mods that I've done.

FWIW...

-M

 

[Gleason]

hhmm I figure with the free exhaust you have it might cause the boost to raise abit but i'm shocked to hit 16 on stock exhaust. I'm now wondering if the slight timing pull because I'm boosting on 7 month old gas. [ car just came out of storage. its currently getting strut towers fixed because of too much rust but hopefully by tonight or tomorrow i can fill the tank with fresh 93 and see what my timing is.

I checked the hoses near the WG and they all seem fine, not kink'd or corroded. Cars still gone so I can't boost leak test yet.

 

[miden]

hhmm I figure with the free exhaust it might cause the boost to raise abit but i'm shocked to hit 16. I'm now wondering if the slight timing pull because I'm boosting on 7 month old gas. [ car just came out of storage. its currently getting strut towers fixed because of too much rust but hopefully by tonight or tomorrow i can fill the tank with fresh 93 and see what my timing is.

I checked the hoses near the WG and they all seem fine, not kink'd or corroded. Cars still gone so I can't boost leak test yet.

It's probably more the 1G bov than anything else. The 2G bov leaks if you look at it cockeyed. Still, can't hurt to check for boost leaks. The boost leaks that I've had always limit the boost and cause a stutter, which you haven't mentioned.

Let me know what you find...

-M

 

[Gleason]

It's probably more the 1G bov than anything else. The 2G bov leaks if you look at it cockeyed. Still, can't hurt to check for boost leaks. The boost leaks that I've had always limit the boost and cause a stutter, which you haven't mentioned.

Let me know what you find...

-M

will do once I get the car back monday. Just found the welding place didn't get struts completly done and they aren't open on weekends.

 

[talondude4]

I was boosting 14psi with the bsc removed.

 

[oldman]

1. How do you know if you weren't already boosting 16psi prior to the 1G bov install if you have just installed the boost gauge?

2. Is the exhaust still stock? I have seen several cases of boost creep covered up by a leaky 2G bov which later was revealed by upgrading to a 1G bov. Are you hitting 16psi immediately or does it hit 11-12psi first then creeps to 16psi as rpm increases.

3. Once you're sure boost creep isn't the issue here, disconnect the hose on the compressor housing fitting as well as the actuator (wastegate) fitting, connect both fittings with a fresh hose and go for a test run. If boost level drops to 11-12psi, The factory bcs was bleeding off too much pressure. If boost level stays the same at 16psi, the actuator is probably on it's way out. Anything in between is probably a little bit of both.

4. Boost leak test wouldn't hurt.

 

[Gleason]

1. How do you know if you weren't already boosting 16psi prior to the 1G bov install if you have just installed the boost gauge?

2. Is the exhaust still stock? I have seen several cases of boost creep covered up by a leaky 2G bov which later was revealed by upgrading to a 1G bov. Are you hitting 16psi immediately or does it hit 11-12psi first then creeps to 16psi as rpm increases.

3. Once you're sure boost creep isn't the issue here, disconnect the hose on the compressor housing fitting as well as the actuator (wastegate) fitting, connect both fittings with a fresh hose and go for a test run. If boost level drops to 11-12psi, The factory bcs was bleeding off too much pressure. If boost level stays the same at 16psi, the actuator is probably on it's way out. Anything in between is probably a little bit of both.

4. Boost leak test wouldn't hurt.

1 ] I'm assuming I wasn't hitting 16psi before on stokc 2G because I logged my Timing before and it was spot on good. Now on a 3rd gear pull my timing is 6 degress lower at 5700rpm [ 12 instead of 18 before 1G bov ]

2] exhaust is still stock. Has an exhaust leak [ very small ] thats getting patched now.

3] Its not creeping, it just shoots right to 16 and holds it until 5500rpmish where the T25 can't push that much air, then it drops to about 10-12.

4] will assemble and boost leak test once i get the car back monday. will also try what you suggested for #3 also.

 

[Gleason]

heres an update. Got the car back today. only 1/4th tank left of 7 month old gas so i filled it completly with 93 from mobil, ran it normal driving for 10-15 minutes. then i did a 3rd gear pull, and my timing at 5700rpm is now 16degrees with it steadily increasing to 19 degrees by 6400rpm .

02 voltage is from .94 to roughly .92 at 6400rpm so i am guessing i am getting towards the limit on stock pump, because .92 is getting near the 'lean zone'. But i don't drive/race over 6200rpm anyway so i am good for now until I rewire.

I am going to boost leak test and double check my actuator lines tomorrow [ i am heading to work now, and when i get out all hardware and auto stores are closed. ]

 

[forcefed4]

Let me know what you find on yours, I have the same problem right now, just installed Dejon UICP + HKS SSQV, mine went to about 17 psi on stock exhaust, I haven't had much time to mess with it yet, but I was thinking about replacing the factory bcs with a manual boost controller

 

[95GST2841]

cant wait till I get a boost gauge, I get all kinds of knock and my car runs like hell when its hot out.. I'm probably boosting around 16psi too. Somethings wrong with my car that sounds alot like this

 

[Gleason]

I found a pretty bad boost leak at my 1g BOV. I got new gaskets for it from local mitsu dealer. 1.77 each. I also got fed up and put on my T25/T28 17 psi WG actuator from ForcedPerformance. put that on while waiting for my gaskets to ship into the dealer. I'm now hitting 20psi, i don't think I adjusted it right, but i'm going to keep it like that for now [ my timing is good, and my fuel is too. 19degrees timing at about 6700rpm and .96 02 voltage..so ith as enough fuel and no apparent knock from my logger]. I don't boost 20psi on a daily basis, only the occasional hard acceleration, so i hope the T25 will last a few months until I put DSMlink on.

anyways in short. I put on a new WG actuator, and fixed my BOV gasket leak. Never really found what was causing my extra boost.