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Brand new turbo very slow spool

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clang1114

10+ Year Contributor
50
0
Dec 26, 2011
Billerica, Massachusetts
I just purchased and installed a brand new FP 68hta turbo. I installed it correctly. Primed the oil system. Checked for boost leaks. Yet something just isn't right.
The car will build 6 psi by 4k rpm but after that it will spool very slow. Won't hit 20 psi until 5500 rpm.

My mods are
68hta turbo
FMIC
Fp exhaust manifold
Tial 38mm wastegate
Hall man boost controller
Dsmlink v3
Web 546/547 cams
Adjustable cam gears
A few things may be left out
Is there something I am totally overlooking? Maybe the wastegate is stuck open? I thought my tune was an issue at first but going from the evo16g to this shouldn't affect mid range spooling at all. I will attach a log tomorrow.
 
Just curious because i havent seen anyone ask it. Have you physically when the car is cold of course try spinning the turbo. Is it possible something is wrong with its internals when they put it together. To see how it is take your old turbo spin it see how it reacts then spin this one. IF it seems like something is holding it back SOMETHING IS VERY WRONG.
 
Have you tried to spin the turbo it self. I would take the intake off and spin the wheel see if it is under some kind of restriction. You can compare the feeling with your old turbo. If you are having a hard time spinning it turbo is bad or put together wrong.
 
Okay so I've removed the exhaust so it's just the dumped O2 housing. No BC, just wastegate pressure it hits the 16-18 like it should and spools how it should but spikes/creeps to the moon. I just keeps climbing, of course I let out but it was nearing 30. Now I've checked everything over. The only thing it could be is either the hole is too small to flow enough air or the flapper isn't opening all the way. Jus have you made other turbos like mine with this problem? Is this the only style hta68 other than the actuator you've made? It's one of those issues or a combination.
 
I've replaced every gasket. Boost leak tested to 30 psi. Checked my wastegate. Checked my bov. I am still not reaching 25 psi until 5k rpm.

I can tell something just isn't right whether it be the product not being what it claims or the turbo having a defect. The turbo does nothing between 3500-4500. It doesn't make any kind of spool noise. Around 4200 it will make about 8 psi then it will crawl to 25 by 5k.

I am extremely unhappy with this product. As of right now I recommend everyone to stay away from the 68hta.
 
I am gonna ask again have you physically tried to spin the turbo. If it feels like it is under restriction most likely you have a bad turbo and it was put together wrong. You can do this by the exhaust or intake which is much easier. Spin by hand and compare it to another turbo you have like your old one. If there is a huge difference then its bad.
 
Yeah I did check the turbo compressor wheel. That was the first thing I checked. It spins fine like it should. I emailed FP and complained a little. They basically told me that building a race car can be complicated and the most they can do is check the turbo if I send it to them. I asked them what they think the turbo should spool and make full boost by. So we will see what they say.

I tried doing some tuning because my timing drops fairly low around 3800 rpms because that was around where my old turbo hit boost. I raised the timing but no difference. It just amazes me how slow this turbo is. It would be nice if I had a smart tuner to maybe help and do their best to get the car to wake up but it would be a waste to lay a lot for no change. I ran a turbolabs tdo5 20g and even that spooled faster. Fp claimed it would be same spool as a evo16g on their site.

Does anyone thing that my camshaft a could have that significant of an affect on spool? I'm running old web546/547 cams and I've heard they lack in torque.
 
Now i had a big t3/t4 on mine. I remember we retarded the timing alittle. I also had a MSD for spark. Have you checked if your car is running really rich also. That can impair the spool. I really would spend the money and take it to a dyno shop who can tune it.[DOUBLEPOST=1409114524][/DOUBLEPOST]holy crap you are running 500's i ran 272 crowler cams...i dont know much about your cams but ya those could possibly be a problem.
 
It sounds more like a combination of your tune and the cam timing than the turbo. You seem pretty set on blaming the turbo, and while that's not impossible, don't rule out things that are not immediately obvious.

Whether it's because something has changed coincidentally when you switched turbos or your current configuration is just not complimentary. These are very complex, dynamic systems.

Your individual results are atypical of what most 68hta logs I've seen show. 25psi @ 5k is more sluggish than my HX52. Think about it.
 
Just waking up the car from winter hibernation and struggling with this problem still. I purchased a spare goal 38mm wastegatr that I will be swapping in to see if that makes a difference.

Seems like the car builds some boost by 4500. About 14 psi but my first gear is super sluggish. If I floor first hear it pretty much doesn't spool at all. Feels like a non turbo car.
 
He has already mentioned several times he did a boost leak test.

Since it ran perfect with the old turbo, you really got to focus on the new turbo itself, granted its possible for other things to cause it, but not likely. The fact that its able to create SOME boost tells me its a wastegate problem. Find a way to keep the wastegate shut, or maybe create a gasket to completely block the passage (just for testing)... And lastly, you really got to verify that blue rag has blown out the tail pipe, no way around it. Just because its straight through, it could catch at the rear o2 sensor or even at just a slag of a weld
 
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+1 on that rag. You did mention a while back in the thread that it is possible that one fell in the down pipe. Have you checked that? Didn't see anything else about that, As that would cause this. But would think it would change the sound pretty noticeably :idontknow:

Good luck though man I hope you get it figured out. Have you contacted the seller about it?
 
If he's already gotten on the car I would think that a blue shop towel would be blown apart or burned, so would a cloth rag. It's pretty darn hot in the exhaust of a turbo car LOL. I've seen a mildly tuned srt-4 melt the cat and blow molten chunks out the muffler when we were dyno testing at school. So maybe you just melted your cat, or its clogged?
 
Our setup is the mostly the same minus my Delta 272's, and FP 18psi Internal Wastegate. I do most things myself but I hadn't ported a turbo, and it was brand new at that. Took it in to get it completely ported. Tune stayed the same but it fixed all spool issues. No more 6k full spool, but not only that it acts like it doesn't have that resistance. Now it still hits 25 psi at 4.1k and that most likely has to do with my tune and cams. I'm not worried that I went from 3700 full spool to 4.1k with cams and porting, may be too much lag to others but the point is that fixed it. Now obviously I'm on internal and it was probably the small wastegate hole that needed the porting for it function properly. I thought it was my exhaust so I was removing sections, adjusting the wastegate rod, still no luck. I know you won't be on internal so I'm curious if since all of those problems were based off the wastegate, if yours is functioning correctly.
 
Just waking up the car from winter hibernation and struggling with this problem still. I purchased a spare goal 38mm wastegatr that I will be swapping in to see if that makes a difference.

Seems like the car builds some boost by 4500. About 14 psi but my first gear is super sluggish. If I floor first hear it pretty much doesn't spool at all. Feels like a non turbo car.



Do you still have your old turbo? If you do put it back on, you shouldn't see any problems since your car was running fine with your evo3. I have the same problem with a 50 trim and bc272 but I think is my tune. 1st 2nd gear I build no boos at all. :(
 
I had some time to work on my car and I decided to put a 7cm hot Side on hoping for better spool. After I removed my hot Side I found turbine wheel was too big. I was under the impression it would fit the 7cm housing. I feel like this is the reason the turbo doesnt spool like I thought it would. I was under the impression the turbine wheel was smaller. Is it even possible to machine a 7cm housing to fit this bigger turbine wheel? Either way I am going back to the 16g
 
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