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16g spools like gt42r

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kenuwine4g63

10+ Year Contributor
601
47
May 26, 2009
Charlotte, North_Carolina
Whats up guys. My 16g spools super late on 15psi. In 2nd gear it creeps to 15psi and by the time it gets there its time to shift, so i have no power. I also noticed that it howls. I do know that my down pipe is not all the way on. Could that leak cause my turbo to spool super slow and howl like that. And also i read on porting the 16g but only porting for boost creep, Do i port the hotside where the exhaust comes in to port for faster spool. :confused:
 
What RPM do you see 15psi?

The two easiest things to check are for boost leaks and pre-turbine exhaust leaks. Check for shaft play as well.
 
I recently had a Evo316g that was spooling very slow,and making a howling/whistling sound......It was the bearings going out and the compressor blades rubbing the housing. After a new shaft, rebuild and new compressor blade, it is finally running good.
Good luck.
 
I see 15 psi by at least 5700 rpms. I will be taking everything apart when im off work again(monday). Theres no shaft play, the blades arnt touching the compressor housing or none of that. I think the sound is coming from the gap between the hotside and the down pipe where theres a gap. But could that also be the cause of a slow spool?
 
I don't think exhaust leaks after the turbine housing are going to affect spool negatively.

Do a BLT and check for pre-turbine exhaust leaks (like looks turbo to manifold bolts, cracked exhaust manifold, checking your WGA to see if its partially open when it should be closed).
 
ok..I will be changing out my j-pipe and make another custom set-up that will hold up better i think that it leaks right where the j-pipe connects to the turbo and im missing one bolt from the exh mani to the turbo. Does anyone know what size bolts they are. I can pick one up at lowes and or home depot.
 
The turbo to manifold bolts are 10mm x 1.25 and 80mm long. Make sure if you are buying them from a hardware store, that they are at least grade 11. Don't get anything less.
 
When the car is cool try pushing the wastegate arm into the hotside. Also make sure it is tight and you can't push it back into the wastegate itself.
 
When the car is cool try pushing the wastegate arm into the hotside. Also make sure it is tight and you can't push it back into the wastegate itself.
Yea man, it is tight extremely tight. I can push it into the hotside but cannot push it back into the wastegate. Theres no boost creep at all, just major slow spooling.
 
Ok well if you can push it into the hotside then the arm isn't covering the hole. How did it feel after you pushed it into the hotside? Push it very hard and how much movement in did it get?
 
Ok well if you can push it into the hotside then the arm isn't covering the hole. How did it feel after you pushed it into the hotside? Push it very hard and how much movement in did it get?
I can move it but its tough. So your telling me that i dont suppose to be able to push the wastegate open by hand by grabing the wastegate rod and pulling it toward the hotside to open the wastegate???

And i found some bolts for the manifold to the turbo but they are only 10mmx1.25 75mm long. Would they work just as good or do i have to have 80mm long. And if so what hardware store do you recommend?

OK i found some bolts at a local hardware store called fastonal. But there allen wrench heads, but they are also grade 12.9. So i will be purchasing them, but im not clear on what you said about the waste gate arm. Break it down 1 more time
 
Those bolts should work. Your talking about movement this way... <<<>>>

I am talking about this way first << into the wastegate. And the this way ^^^ into the actual housing.
 
Those bolts should work. Your talking about movement this way... <<<>>>

I am talking about this way first << into the wastegate. And the this way ^^^ into the actual housing.
I didnt check it that way. give me a few minutes and i will run outside and see if it moves in either direction

Ok, its tight both ways <<<< that way and ^^^^ that way. it wont move either way. But when i move it >>>> that way and let it go, i can here the flapper slap against the hole. I'll take it off tomorrow and see wut i can do different. What size bolts go into the j-pipe to the turbo itself.:confused:
 
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try unhooking the wastegate actuator arm and see if it spools any slower
 
Are you running a manual boost controller? Depending on the style, i had a bleed off style and the lower i had the boost set the later boost would hit. The higher i had it set the quicker it spooled.
 
I recently had a Evo316g that was spooling very slow,and making a howling/whistling sound......It was the bearings going out and the compressor blades rubbing the housing. After a new shaft, rebuild and new compressor blade, it is finally running good.
Good luck.

^^^+1 I think u hit the nail on the head. Blown turbo.
 
Are you running a manual boost controller? Depending on the style, i had a bleed off style and the lower i had the boost set the later boost would hit. The higher i had it set the quicker it spooled.

This is exactly the problem. I have the turbo xs hpbc. The other problem was i had some serious boost leaks, i mean some serious ones. I fixed all those now i need a standard mbc, not all that fancy stuff.
 
Good luck with the fix.

Did you check your boost leak with a Vac tester? or just the known problems you can see...AKA gaps in your j-pipe as you stated. Can you spin the compressor wheel with your finger easy? can you see any scaring on your compressor housing?

If you can spin it ok, no scratching, and no major cracks in your exhaust housing, or exhaust leaks (yes this will make your spool bad) then it sounds like your have another problem. I would check those first though.
 
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