Garret GT3076R turbo... but no boost... help!

[TheShark]

I just purchased an a4 with a garrett GT3076r turbo and supporting mods for a great deal.. the guy i bought it from claimed it had a crack in the intercooler pipe so he had it running on stock injectors and stock ecu which make no boost.. now i'm desperately trying to get the boost to work.. i cant find a boost leak anywhere. i can hear the turbo spooling so i know its not blown.. I swapped the injectors to the 630cc and the tune to go with it and it ran like absolute crap just misfiring all over the place so now its back to stock injectors and stock ecu.. when i'm at idle my boost gauge says -19 in/hg then when i press the gas it goes to 0 but wont produce any boost.. my air fuel meter is saying i'm at around 12.. This is my first boosted car so I am new to all this.. any help would be greatly appreciated. I have pics of the whole setup if anyone needs them.

[ray4624]

yea you should probably start with a tune and injectors for the turbo. Im assuming whatever tune you had required a 3" maf aswell

[TheShark]

but shouldn't it be boosting 7-8psi without the tune/injectors? its boosting 0.. and with the tune and injectors it ran horribly.. it wouldnt ket me rev past 2500k rpm and it was shaking and misfiring..

[ray4624]

might have been a maf issue as well. if the tune calls for a 3" maf and youre running stock then its going to run like shit. Were you boosting fine with your previous turbo?

[TheShark]

I just bought the car, supposedly it was running for a while with this current setup..

[Seerlah]

Need a lot more info.

Year of car?
What tune? What does it require?
Did you boost leak test? How?
What boost controller?
And saying around 12 isn't saying much.
Did you TB adapt?
Did you let the ECU learn the car?

[bw86]

Kinda sounds like the wastegate is stuck open

[zandrew]

which gt3076r since there is both internal wastegate and external? Get some pictures and post them.

What tune and injectors? I'm sure with a gt3076r and 630cc injectors the tune will require a maf upgrade.

I've seen this happen before when a person left a nut in the intake. It destroyed the compressor but still sounds like its spooling.

[redline380]

Stock ecu and injectors on a 3076 and you want boost? You have much to learn young Skywalker. Be happy the engine still works. Put the 630 injectors and ecu back in and then work on it

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[walky_talky20]

So you bought a heavily modified turbo car that had zero boost during the test drive and came with a pile of parts? I hope you got a heck of a deal on it.

I agree. The tuned ECU probably requires a different MAF housing. So the thing runs incredibly rich when you switch that ECU and injectors in and retain the stock MAF housing.

The lack of boost is probably caused by a wastegate issue. It may have been caused *on purpose* by whomever swapped the stock ECU back in. You really don't want a 3076r spooling up on stock fueling. So the wastegate may be rigged to be open all the time just for that reason.

There is some underlying reason the stock stuff was swapped back in to begin with. So that also needs fixed - whatever it is. It could be the wastegate thing, or something else entirely. Being heavily modified does not make diagnosis like this easier. Much the opposite.

I would start by figuring out what tune you have and what hardware it needs. If you can extract that kind of information from the previous owner while you still have contact, that would be good.

[Seerlah]

Not really a smart move to pick up a project car (especially your first boosted car) with issues if you have never dealt with a car of that caliber before. You pick up a project car if you know your way around it (or have an enthusiast mind, which I hope you have). Or you pick up a 100% complete running car or damn near close to it.

[walky_talky20]

But at least he has come to the right place.

[redline380]

But at least he has come to the right place.

Agreed. OP, I request as many pictures as you can possibly load on here. Pictures of the turbo, wastegate, injectors, throttle body, pretty much everything.

[Seerlah]

^This, along as with as much of the car specs you know (ie year, drivetrain, and parts on your car).

[redline380]

I just purchased an a4 with a garrett GT3076r turbo and supporting mods for a great deal...

I am starting to understand this part LOL

[TheShark]

which gt3076r since there is both internal wastegate and external? Get some pictures and post them.

What tune and injectors? I'm sure with a gt3076r and 630cc injectors the tune will require a maf upgrade.

I've seen this happen before when a person left a nut in the intake. It destroyed the compressor but still sounds like its spooling.

Its an external wastegate which has a lot of carbon built up around the actuator housing but no carbon on the rest so my guess is its stuck open and causing the exhaust gases to not even spin the turbo.. heres the best pic i could get without going underneath the car..

So you bought a heavily modified turbo car that had zero boost during the test drive and came with a pile of parts? I hope you got a heck of a deal on it.

I agree. The tuned ECU probably requires a different MAF housing. So the thing runs incredibly rich when you switch that ECU and injectors in and retain the stock MAF housing.

The lack of boost is probably caused by a wastegate issue. It may have been caused *on purpose* by whomever swapped the stock ECU back in. You really don't want a 3076r spooling up on stock fueling. So the wastegate may be rigged to be open all the time just for that reason.

There is some underlying reason the stock stuff was swapped back in to begin with. So that also needs fixed - whatever it is. It could be the wastegate thing, or something else entirely. Being heavily modified does not make diagnosis like this easier. Much the opposite.

I would start by figuring out what tune you have and what hardware it needs. If you can extract that kind of information from the previous owner while you still have contact, that would be good.

I got it for 4000$ a great deal in my opinion. and yeah when i did the 630cc injectors and eurodyne tune to go with them the engine was running insanely rich it was misfiring like crazy. you thinks thats only because of the MAF?

Not really a smart move to pick up a project car (especially your first boosted car) with issues if you have never dealt with a car of that caliber before. You pick up a project car if you know your way around it (or have an enthusiast mind, which I hope you have). Or you pick up a 100% complete running car or damn near close to it.

Before this i rebuilt/restored an 84 633csi and had a 330ci which i did tons of work on, i know my way around an engine but boost is a whole new thing to me.. i definitely plan to learn a lot and do the work it takes to get this 400 horsepower monster back in great condition

Agreed. OP, I request as many pictures as you can possibly load on here. Pictures of the turbo, wastegate, injectors, throttle body, pretty much everything.

Heres a bunch of pics of everything. this is when i just picked up the car... its extremely dirty.











Heres a video of how it runs with 630cc injectors and the tune
http://s856.photobucket.com/user/cor...dda38.mp4.html

Heres a few pics of the car (RS4 bumper came with it, i just took it off to inspect the intercooler pipes etc..

[redline380]

Wow.

Okay, is that a fuel pump on the false firewall? Wow.

That blowoff valve needs to be taken out and replaced with a dual piston one.

I'd also like to see photos of the MAF setup. Won't be a big deal since the bumper is already off.

[TheShark]

Wow.

Okay, is that a fuel pump on the false firewall? Wow.

That blowoff valve needs to be taken out and replaced with a dual piston one.

I'd also like to see photos of the MAF setup. Won't be a big deal since the bumper is already off.

haha yep.. its a Bosch 044 i think. I'll get to the BOV eventually but right now i just need to get the car boosting. tomorrow I'll take pics of the MAF setup.. theres an RS4 MAF housing in the trunk so im gonna try installing that tomorrow

[redline380]

I'll get to the BOV eventually but right now i just need to get the car boosting.

No, you don't. Stay away from boost, stay very far away. Does the engine even have upgraded rods?

And don't just throw in a random maf housing. It will only make shit worse. If the scaling isn't correct on the mapping, it won't work well. The tuning/injectors/MAF needs to match in order to ensure harmony

[TheShark]

No, you don't. Stay away from boost, stay very far away. Does the engine even have upgraded rods?

And don't just throw in a random maf housing. It will only make shit worse. If the scaling isn't correct on the mapping, it won't work well. The tuning/injectors/MAF needs to match in order to ensure harmony

The car has manley i beams. the car was meant to run with a 3 inch maf housing, 630cc injectors, and the 630cc eurodyne tune to go with it.. i had the car running with the tune and injectors and it ran like absolute crap.. i can try that again with the 3 inch maf?

[redline380]

i had the car running with the tune and injectors and it ran like absolute crap.. i can try that again with the 3 inch maf?

YES!! Try running it with the proper MAF! That is very very important.

[TheShark]

YES!! Try running it with the proper MAF! That is very very important.

tomorrow im gonna check my wastegate first because right now im not running any boost.. then ill replace the injectors and ecu back to the 630cc and ill replace the maf with the 3 inch rs4 maf.. ill take a video of what happens and post it! thanks everyone for their help.

[Seerlah]

Like Lucas said, get rid of that single piston Tial. Great blow off valve, but is not designed for your car. Only way it could work properly is if the MAF were after the BOV. But...it isn't. You can use a BOV, but you should consider running a recirculating valve since you have a MAF setup. Since you have a Tial, use that flange and get a Tial one. Sell that BOV to get money back. That would be your best option for keeping the ECU happy on respects to air accounted for being dumped into the air. You can run it of course, but it's not ideal for your setup. You will also need to make a provision on your intake for the recirculation.

For starters, take that WG off and take it apart. See what you are dealing with. And ideally you want to relocate that pump into your tank (I'll post parts necessary for the swap if that is indeed an 044). And on the topic, find out what is in your tank. What boost controller are you using? Stock n75?

[TheShark]

Like Lucas said, get rid of that single piston Tial. Great blow off valve, but is not designed for your car. Only way it could work properly is if the MAF were after the BOV. But...it isn't. You can use a BOV, but you should consider running a recirculating valve since you have a MAF setup. Since you have a Tial, use that flange and get a Tial one. Sell that BOV to get money back. That would be your best option for keeping the ECU happy on respects to air accounted for being dumped into the air. You can run it of course, but it's not ideal for your setup. You will also need to make a provision on your intake for the recirculation.

For starters, take that WG off and take it apart. See what you are dealing with. And ideally you want to relocate that pump into your tank (I'll post parts necessary for the swap if that is indeed an 044). And on the topic, find out what is in your tank. What boost controller are you using? Stock n75?

After i get the boost fixed i'll get a diverter valve or some sort of hybrid setup.. and im running a manual boost controller with a vacuum line going directly to the wastegate

[ray4624]

A bov that is open at idle will cause crazy rich situations. Also adding to your problems.


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[demonmk2]

I have to ask, when you say boost stays at zero are
You driving down the road or just revving the engine with no load?

[zandrew]

If you have the car parked and you revving it then you will not make boost. It was pointed out above but it was most likely set up to run no boost with stock ecu and injectors. You have to recirculate the bov or the tune is shit. You need the older 4.2 maf or is not going work right. A simple way to disarm the wastegate is to remove is spring.

If the car is not running right then boost is simply going to compound issues. It seems like your eager to feel it spool and suck you back But what's going suck is having a massive fuck up equivalent to setting your 4k on fire.

Do not try to get it to boost before fixing all the issues especially the recirc bov. Your asking for it since the tune is specifically designed to be run that way. messing with tune requirements is like sticking your dick in beehive. Nothing good will come from it.

I'm not so sure you have gt3076r. It does not have coolant ports and I have never seen an oil restrictor like that on its feed. Not to mention that garrett never ever used a t3 bearing housing in bb turbos. You either have a knock off gt3076r or a t3t4 turbo.

[Seerlah]

He needs to find out what tune he actually has. The old Eurodyne tune for the AEB used the Ford Lightening MAF. Now they use the 4.2 Audi V8. Not sure if they used a different one in between transitions, like a VR6. I would not recommend this guy to just start throwing MAFs at the car not knowing what the tune actually requires (which one he has).

And I'm going to go out on a limb here and say the seal for that EWG is a goner.

[gmx]

where is the boost gauge tapped into ?
I can't remember the thread but someone had managed to tap into an area that doesn't see any boost, only vacuum.

[zandrew]

He needs to find out what tune he actually has. The old Eurodyne tune for the AEB used the Ford Lightening MAF. Now they use the 4.2 Audi V8. Not sure if they used a different one in between transitions, like a VR6. I would not recommend this guy to just start throwing MAFs at the car not knowing what the tune actually requires (which one he has).

And I'm going to go out on a limb here and say the seal for that EWG is a goner.

I'm confused on the tune and injectors. Either I missed it or people are assuming he got the tune and injectors with the car. I thought he bought them after the fact. But yeah he definitely needs to get what the tune requires.

[Seerlah]

I'm confused too. I was thinking he had the old tune the OP gave him and he swapped it in. Need more info.

[zandrew]

I know this is not what your going to want to do but I think breaking the car down and figuring out what you have and don't have is the best resolution. You don't have a gt3076r, the bov is completely wrong, I can't even see a maf, the wiring looks bad at best. Honestly It could be several issues. Not getting in hurry and doing this right is the only logical solution and breaking it down and figuring out what you have and what you need is probably your best bet.

I would be prepared to spend some money to get it right.

[Seerlah]

^I agree! But he does have to break much down, which is the good thing. Just reconfiguration and taking out of parts purely for inspection purposes.

[zandrew]

List:

Check the turbo compressor for damage (since it a journal bearing I would check play as well)
remove wastegate and inspect diaphragm and spring also check for fire ring
remove BOV and set for recirculate
check all vac and boost lines
Check spark plugs for proper gap
check codes and resolve codes
Check all wiring and fix any issues
Check tune and injectors and make sure to use appropiate supporting parts like MAF (if someone close has a similiar setup you could swap your parts on like ECU, MAF, and injectors and make sure it works OK if you can not resolve the issue first)
Check intercooler and intercooler lines

I would also be prepared to do some maintenance like timing belt if you are not 100% sure when it was done.

I am sure there is other stuff needed to look over. Also how does the wastegate dump, does it return into the down pipe or does it dump external? If it is external dump then you should be able to hear it dumping the exhaust if it is open. It should be very very loud.

[M-Hood]

Wow.

Okay, is that a fuel pump on the false firewall? Wow.

That blowoff valve needs to be taken out and replaced with a dual piston one.

I'd also like to see photos of the MAF setup. Won't be a big deal since the bumper is already off.

With the right spring for the amount of vacuum the car makes at idle the Tial BOV shouldn't be an issue. It should only open when it needs to which is when the throttle is lifted and a high amount of vacuum is produced in the IM.

where is the boost gauge tapped into ?
I can't remember the thread but someone had managed to tap into an area that doesn't see any boost, only vacuum.

Shouldn't be an issue Brian seeing it looks to be a AEB which doesn't have that 249 valve that is used to control the BPV in the dbw cars.

[sovende96]

If you have the car parked and you revving it then you will not make boost. It was pointed out above but it was most likely set up to run no boost with stock ecu and injectors. You have to recirculate the bov or the tune is shit. You need the older 4.2 maf or is not going work right. A simple way to disarm the wastegate is to remove is spring.

If the car is not running right then boost is simply going to compound issues. It seems like your eager to feel it spool and suck you back But what's going suck is having a massive fuck up equivalent to setting your 4k on fire.

Do not try to get it to boost before fixing all the issues especially the recirc bov. Your asking for it since the tune is specifically designed to be run that way. messing with tune requirements is like sticking your dick in beehive. Nothing good will come from it.

I'm not so sure you have gt3076r. It does not have coolant ports and I have never seen an oil restrictor like that on its feed. Not to mention that garrett never ever used a t3 bearing housing in bb turbos. You either have a knock off gt3076r or a t3t4 turbo.

Dimitri, what this guy is saying is true. As I remember you have been just revving it and haven't had it leave your driveway since you've got it (due to no registration). When there is no load, there is no boost. Just an fyi. You might be getting "boost" but not know it. !

[redline380]

Dimitri, what this guy is saying is true. As I remember you have been just revving it and haven't had it leave your driveway since you've got it (due to no registration). When there is no load, there is no boost. Just an fyi. You might be getting "boost" but not know it. !

So OP never even put the car under load????? Of course you haven't seen boost! But its probably a good thing considering he was on stock programming. May have inadvertently saved his own ass

[sovende96]

So OP never even put the car under load????? Of course you haven't seen boost! But its probably a good thing considering he was on stock programming. May have inadvertently saved his own ass

Yes, OP hasn't had it leave the driveway. A explanation for not seeing boost.

[redline380]

Yes, OP hasn't had it leave the driveway. A explanation for not seeing boost.

Well no shit. OP has a thing or two to learn. With that said, you can usually get a few pounds of boost to show up under minimal load. But you certainly wont see more than a few unless you are running anti-lag or something

[sovende96]

Well no shit. OP has a thing or two to learn. With that said, you can usually get a few pounds of boost to show up under minimal load. But you certainly wont see more than a few unless you are running anti-lag or something

Yes, very true. It is his first "turbo" car but should be mostly common sense when it comes to

"Drive car to make boost. Idling car in neutral, no boost" lol