Going lean and bogging in boost

[VelocitàPaola]

You can measure the diameter of the disk to determine its calibration. I believe the 12:1 disk is 2.72", though you can go to Vortech's website or call them to confirm.

I doubt the size of the vacuum line would cause this problem; the AFPR is actuated on pressure, not airflow. Pressure acts on all points in a system equally*: if the manifold is under 8psi of pressure, so is the PCV valve and the FPR. The hose diameter would have to be extraordinarily small before you saw unusual behavior.

Like Ryan said, just make sure there are no kinks or tears in any of the vacuum lines.

*There are caveats to this statement, so don't inundate me with critiques. Non-Newtonian fluids and compressible fluids act differently. At lower pressures and velocities, though, air behaves similarly enough to a compressible fluid.

 

[dsmdragon]

Hey sorry for the late reply.
so I don't think it's a fuel filter problem.....
I took the fmu off the car and found out that vortech mest up my order and gave me a 6:1 or something like that. So luck on my side I had a 10:1 kit sitting around and that fixed my problem quick. It hits boost great, well then I blew my gasket out.

But since I got that fixed I have had a problem/and or a question. The turbo I'm runing is a t3 with a 48trim compressor. when i'm at WOT I can only hit 5psi with this turbo even though the wastegate spring is at 8psi and i've run 10. Am I maxing out the thing or not.....

 

[DSMcrazy3]

I would still up it to a 12:1.

As long as your waste gate actuator is properly functioning, sounds like you have a boost leak on your hands.

 

[dsmdragon]

Yea, a lot of people say 12:1 is what should be using. Well, I had the car tuned at my shop I go to and they said the 10:1 is perfect for me and my power curve. I'm reading close to perfect A/F readings on the gauge 11.5:1 i'm sure, and the car was tuned an they got readings a little ritch as well.
But I am wondering if I'm justing topping out the turbo since the one I have on the car can only support 250hp, with out over doing the compressor. I'm at 253hp at the moment but that was at 8psi. I can't even get over 5psi with my wastegate working good now. So I'll check again to see if I have a leak, but I need to know if what I'm thinking is true or not about a 48trim turbo. any info is helpfull

 

[DSMcrazy3]

What program was the car tuned with? Not trying to call you out, I just have a really hard time believing you put out 253 HP at 8 PSI..

 

[totaleclipse_05]

What program was the car tuned with? Not trying to call you out, I just have a really hard time believing you put out 253 HP at 8 PSI..

X2, I dynoed my car on a dyno dynamics and at 6 psi with a 60trim t3/t4 turbo I made 184whp with a near perfect AFR.

 

[dsmdragon]

i'm sorry that was a typo...I meant 10psi and 243hp, also I was on 95octane mix. I street drive the car at 8psi cause i have a to stage boost controller so just flip a switch and bamm!. 10psi. I have the head just about maxed upgrades so i'm breathing quit well in each cylinder. And it was a dyno-jet tuning session. I am still wanting to know if I maxed my turbo out or not. I checked for leaks and i'm not getting intake leaks. But I do have a little leak at the manifold gasket where the gasket isn't seating great. but I only feel that when I'm reving the car. So I don't think it would cause A 5psi drop when at WOT... sorry for the confusion I also havent updated my profile info for awhile so it's not perfect. I'll do that now

 

[rstare]

It is normal to see around two psi drop from your intercooler, piping, and leaking gaskets will increase that. Along with lots of bends in the piping and so on.
Start by fixing that gasket.
What kind of turbo do you have?

 

[dsmdragon]

so what you are saying is that I probably had it over 10psi when I was letting them tune/dyno my car since I have alot of bends in my piping. If you look at my routing though the charge side is on the left not the right. So the turbo is going strait down to the intercooler then bends up and to the throttle body. that 6bends tottal. And my effective reading on my intercooler was .2psi for every 10psi so it's not the intercooler cause that wasn't a cheap ebay buy. And I do know the gasket has some drop from it...
I have a garret air-research t3 48trim hot side and 48trim charge side. it's a little bigger then a t25, or close to. it say's it's a 31something... on the tag so its good for up to 250hp, anythnig over and your maxing the turbo.

 

[rstare]

You will have more then a .2psi drop. You just will. I have Hahns FMIC which is probably the best avalible for the 2gnt along with there piping. I was seeing about a 2psi drop; 6psi wastegate spring about 4psi on the boost gauge.
Anything that allows exhaust energy to bypass the turbine will cause a loss in overall boost pressure and slower spool.
Fix your gasket and see if that fixes it. And check to make sure you have no other leaks elsewhere.

 

[DSMcrazy3]

RS you might want to check for leaks my friend. I've had a 4 psi spring in my car - gauge read 4 psi. I've had a 6 psi spring - gauge read 6 psi. I've had an 8 psi spring - gauge read 8 psi.

 

[96TurboGS]

RS you might want to check for leaks my friend. I've had a 4 psi spring in my car - gauge read 4 psi. I've had a 6 psi spring - gauge read 6 psi. I've had an 8 psi spring - gauge read 8 psi.

I'm going to have to go with Ryan on this one, its normal to see a 1-2 psi drop across intercooler piping if you have your gauge mounted into the IM. DSMcrazy3: You wouldn't happen to have your boost gauge hooked up to your compressor nipple would you?

 

[dsmdragon]

No. My turbo doesn't have a compressor nipple, so bov is where the pcv was. the wastegate is to the manifold nipple in the back, and gauge is at the TB. I tried keeping them away from one-another.
Yeah I kinda figured the psi drop with the piping but not the intercooler, just cause of the feedback I got from it. So i figure when they tuned my car they probably had the car at a higher boost setting then I am seeing or was told.

 

[96TurboGS]

Post corrected, My bad...

Have you gotten that gasket fixed? Sounds to be your problem like the others mentioned..

 

[DSMcrazy3]

No, my source is the IM.

 

[totaleclipse_05]

DSMcrazy3: You wouldn't happen to have your boost gauge hooked up to your compressor nipple would you?

That would be pointless to do.

 

[Shadow98]

dsmdragon - I think you are not telling us the truth in regards to your mods!!! We can't help if you don't tell the truth. As far as IC drop, it is pretty common to lose 1-2 psi depending on the size/performance of the IC and boost level. But like dsmcrazy said REPLACE THAT GASKET!

 

[dsmdragon]

I'm only at 7psi still. I'm still not hiiting 10psi. I took it to the dyno dropped it off, had a friend there tune it and he told me those numbers. Said I was at 10psi And I was for a little while then the turbo to manifold gasket poped. Fixed it then a stud came lose on the manifold to head, and I fixed that gasket. And im still not hitting 10... I haven't f-d with the boost controller cause the allen screw is still tight holding it there. All lines are hooked up. no leaks that I can see or find.
so it might be my rings then. Would you make that assessment to or what?

 

[Dwnshft]

WTF I already fixed the damn gasket.... and i'm only at 7psi still. I'm still not hiiting 10psi. And wtf ever dude, my profile shows what I have on my car. If you can't understand how I'm getting the F$#king horsepower then that suck for you. I took it to the dyno dropped it off, had a friend there tune it and he told me those numbers. Said I was at 10psi And I was for a little while then the turbo to manifold gasket poped. Fixed it then a stud came lose on the manifold to head, and I fixed that gasket. And im still not hitting 10... I haven't f-d with the boost controller cause the allen screw is still tight holding it there. All lines are hooked up. no leaks that I can see or find.
so it might be my rings then. Would you make that assessment to or what?

Why don't you try this, gap your spark plug to .25 and I don't know how is it on a N/T with Turbo since it's fuel map is not for turbo version unless you have your ecu change or something. I had the same problem with mine before tried everything and completely waste of time untill I gapped my plugs to .25 and never had the bogging eversince. Hope this helps.

 

[rstare]

What psi spring is your wastegate? What wastegate do you have? What kind of boost controller do you have? How do you have your boost lines routed for your wastegate?

 

[dsmdragon]

I have a turbo XS elec. dual boost controller, 7psi spring on the XS wastegate, wastegate lines come from back of manifold metal T-thing. It's not t'd to anything it's just from the manifold to the wastegate. I put my air compressor on it the other day and it seems to be opening and sealing just fine.