33gtr Not Boosting As It Should

[cefiro]

Hey guys i have a 260rs stagea and i just took the boost restrictor out of the hose going into the solenoid and it wont go past the standard level untill very late in the rev range (if at all) like about 5.5-6k and its still not getting near full boost. it has always made stock boost max boost but with a very heavy right foot. It should be making 1 bar at around 4k rpm shouldnt it???, I have always though it was a little lazy in how fast it made boost, but this is showing me there is something not right. I know the std boost gauge is not very accurate but it should still show when full boost 14psi, hit 7 on the gauge. I have an after market boost gauge on its way and should be in by the end of the week. Car is stock except for an after market front pipe, stock cat back exhaust. Car runs fine idle is smooth and will rev without a missing.

Would the stock exhaust stop it from making boost??

collapsed muffler??

Any suggestions

Even if it were leaning out it should still be boosting???

i am getting a cat back exhaust soon and then a dyno run to check its all good.

Edited March 9, 2008 by cefiro

[samdumbert]

Sounds like a blocked exhaust. maybe take the exhaust off from the cat back just to test it. or see if your mufflers and like theres anything loose in them. Also check the inside of the cat isnt melted or blocked.

[r33cruiser]

possible vac leak.

check check and recheck all the clamps... its happened to all of us.

[cefiro]

yeah Will check all those things again, the cat is new and its a metal 3in so i doubt it will be that, my guess is the exhaust. but I am always wrong

Cheers Boys

[cefiro]

Also, to rule out the possibility of a problem with the boost solenoid, if I disconnect it will it be unlimited boost????

[cefiro]

I had a look around and tightened up hoses etc, didn't find much but now I am worried about having blown the rear turbo. I can see oil around the output side around the piping leading to the intercooler. I have posted pics. I took off the intercooler piping leading to the intercooler and there wasn't much oil only a light coating. The car doesnt seem to be burning excess oil. Runs fine.

answers????

[TommO]

Hey guys i have a 260rs stagea and i just took the boost restrictor out of the hose going into the solenoid and it wont go past the standard level untill very late in the rev range (if at all) like about 5.5-6k and its still not getting near full boost. it has always made stock boost max boost but with a very heavy right foot. It should be making 1 bar at around 4k rpm shouldnt it???, I have always though it was a little lazy in how fast it made boost, but this is showing me there is something not right. I know the std boost gauge is not very accurate but it should still show when full boost 14psi, hit 7 on the gauge. I have an after market boost gauge on its way and should be in by the end of the week. Car is stock except for an after market front pipe, stock cat back exhaust. Car runs fine idle is smooth and will rev without a missing.

Would the stock exhaust stop it from making boost??

collapsed muffler??

Any suggestions

Even if it were leaning out it should still be boosting???

i am getting a cat back exhaust soon and then a dyno run to check its all good.

The stock 3 centre gauges? If so, 7 on there is NOT 7psi

I reckon get it dyno'd and you'll see whats going on with it

[GeeTR]

mmHg, not PSI

Catches ppl all the time.

[justin911]

bloody hell im having the same issue now

boost gauge barely goes up

if one of the turbos died would i be seeing lots of smoke ??

[cefiro]

Thanks for the reply guys but unfortunately i know how the stock boost gauge reads and I wish it were that simple. ?????????

Going to check the wastegates and see if possibly they are jammed.

its very annoying.

[cefiro]

well I dont think its the wastegates they both look to be fully closed at which mean that they must be closed, maybe blocked exhaust. come on I need some more help with this.

I also removed and blocked the boost solenoid line and it wont boost above stock, untill once agian very late in the rev range. What I did was block off the exit line to the soleniod and that hould have run unlimited boost yeah???? well tried it just to see if I could get it past the stock level and wont do it. But I didnt want to boot it too hard as It may damage the engine. Any more thoughts?????

[cefiro]

well its not the exhaust as I just changed it to a trust 3in and nothing has really changed. Going to rip the front Bar off and look for some leeks.

[DLOOOK]

when we pullled out the restrictor in a friends 33 GTR, @ first it dropped down to stock boost levels (5mmHG), was previously running ~6mmHG. Then turned car off and started again and was running @ 7mmHG. So try disconnecting the battery to reset the ecu. Hope it works out for you.

[cefiro]

Did you have to reset the ECU????? I took the front bar off and tightened all the hose clamps and still no difference, I am about to explode, driving me bonkers. Will give that a go, all else fails its going to the mechanic to have a look.

[DLOOOK]

No we didnt reset the ecu. We only turned the car off when we went to the shops, and when we went home it started to boost up to 7mmHG. But i suggest u try resetting ECU.

[cefiro]

Tried reseting the ecu and no diff. hmmmmmmm

[32godzilla]

You may have a blocked line somewhere, have you checked all your vacuum/pressure lines from the solenoid to the wastegate actuators? I had a problem with my 32 GTR but I had a leak so the turbos were overboosting due to not seeing much pressure - yours may be the opposite. Another thing to check is your intercooler hoses attached to the cooler - make sure they're tight as.

[32godzilla]

I took the front bar off and tightened all the hose clamps and still no difference

Guess you've done that!

[cefiro]

Hey guys took the car to the mechanic and all is now good, there was a crimp in the BOV hosing and the line was replaced and its now all good, very happy. Just thought I may as well update so it will be useful for others.