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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.
 
Not that this has anything to do with your problem, but I would definitely run BR7ES plugs with that turbo. 6's (stock plugs) are too hot.
Sorry typo I run the 7s not the 6s.
Have you done this? While the car is cold, fire it up, and feel around the exhaust manifold connecting to the turbine/exhaust housing for your turbo. You'll be able to feel if air is dumping out. This will definitely cause slow/no spool.
I did check for pre turbo exhaust leaks. Used all new gaskets and torqued turbo bolts. I think it's all pretty good around there.

What type of intake pipe do are you running? What turbo did you upgrade from? If you upgraded from a small turbo and didn't change the turbo inlet pipe to a bigger one it will bottle neck your setup and prevent the turbo from doing its thing. I had a similar issue when I first upgraded from a small turbo to a larger one slow spool I changed the turbo inlet from the factory unit to a 4" pipe and problem was solved.

I switched from an evo16g to this fp68hta. I know this turbo flows more air but I'm confused to why spool is affected so much. I run a Dejon tools intake pipe with a 2gmaf. The air filter is a little small. I guess I could take it off for one ride and try that out.
 
Sorry typo I run the 7s not the 6s.

I did check for pre turbo exhaust leaks. Used all new gaskets and torqued turbo bolts. I think it's all pretty good around there.



I switched from an evo16g to this fp68hta. I know this turbo flows more air but I'm confused to why spool is affected so much. I run a Dejon tools intake pipe with a 2gmaf. The air filter is a little small. I guess I could take it off for one ride and try that out.
Can you post a pic? Thanks
 

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Verify you are getting 100% throttle, make sure all cylinders are making compression, Something clogged in exhaust, for example the flex section in the downpipes implodes sometimes on the cheaper ones on the inside down to about an inch but can looks normal from the outside!
 
If it was fine right before this then it is something in the install process most likely. Boost control or the turbo itself perhaps. You guys are grasping at straws. Leave a rag in the intake?
Take boost controller out of the loop and run a direct line. There are a dozen things you could check easily.
 
If it was fine right before this then it is something in the install process most likely. Boost control or the turbo itself perhaps. You guys are grasping at straws. Leave a rag in the intake?
Take boost controller out of the loop and run a direct line. There are a dozen things you could check easily.
I tried running no boost controller and run off wastegate pressure with no difference. I emailed fp about another topic and they took 4 weeks to get back to me with a one word response. I could try calling today. They probably will claim something's wrong with my car though.
 
If you bought that turbo new theyre probably right. Did you try and install a fire ring? Was this car runni g 100% right before this?
 
If you bought that turbo new theyre probably right. Did you try and install a fire ring? Was this car runni g 100% right before this?
The car was running 100% before this on an evo3 16g. I ran a 12.7@113mph before I took it off. I bought the fp 68hta becuase it's suppose spool just as fast or faster. Even when this thing spools it doesn't pull as hard as the 16g

What fire ring? The fire ring on the wastegate? I didn't remove it so nothing should have changed.

A theory I did have a theory. The outlet of the turbo was shaped slighly different on the new turbo compared to the mhi 16g. The small sliver of material between the exhaust outlet and o2 outlet was slighly different but the gasket was stuok contacting okay so I put it back together. I was thinking if the gasket is leaking there then exhaust gas would be bypassing the wastegate thus preventing good boost build up. My question is if the ffwd copper gasket I got is a different shape than fp hot side then what gasket would I get? I got an oem gasket as well that didn't fit perfectly too.
 
I have this exact same problem with a replica HTA68 I bought from Jusmx. It had an adjustable Holset wastegate actuator arm. Look to see if it is threaded on the rod. I had to remove the pin and turn the rod tighter about 3 rotations. I literally am walking out the door to see if it fixed it. I see 10psi at 3k where I can hear the o2 dump so I can know it's opening early and then it starts to creep and my MBC is around 25psi. I have it straight on the wastegate atm so I will let you know if it's good.\

Everything is perfect with my car as well. It has to be the preload.
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If you are running your wastegate off your o2 housing check to make sure your o2 housing bolts are tight.
I'll post a pic if my housing later. I just removed it. You can tell it's sealing by the marks around. I also found some frayed o2 sensor wires which is weird cuz it was still working but the wires were touching.
I have this exact same problem with a replica HTA68 I bought from Jusmx. It had an adjustable Holset wastegate actuator arm. Look to see if it is threaded on the rod. I had to remove the pin and turn the rod tighter about 3 rotations. I literally am walking out the door to see if it fixed it. I see 10psi at 3k where I can hear the o2 dump so I can know it's opening early and then it starts to creep and my MBC is around 25psi. I have it straight on the wastegate atm so I will let you know if it's good.\

Everything is perfect with my car as well. It has to be the preload.
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I wish my problem was that but my flapper is gone and I'm running a tial 38mm wastegate.
 
I see 10psi at 3k where I can hear the o2 dump so I can know it's opening early and then it starts to creep and my MBC is around 25psi.
Unless you have some ridiculous turbine/exhaust backpressure, there's no way the flapper would open enough to be audible at 10psi unless something's wrong with your boost controller which is allowing it to feed a small amount of boost to the actuator.

http://www.dsmtuners.com/threads/fp-green-install-zero-boost.414683/

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Unless you have some ridiculous turbine/exhaust backpressure, there's no way the flapper would open enough to be audible at 10psi unless something's wrong with your boost controller which is allowing it to feed a small amount of boost to the actuator.

http://www.dsmtuners.com/threads/fp-green-install-zero-boost.414683/

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I am in the exact same boat as him except internal wastegate. I'm on straight intake to wastegate, mbc is off. 10 psi then creeps to 16 at 6k. Everything worked great before, just upgraded the turbo. Nothing changed, I do not get it. If I have the mbc on and crank it then I have a linear boost curve. 10psi 3k and it's dumping, 15 at 5k, 20 at 6k then 25 psi at 7k. I have no clue I checked everything and I know you pressure tested that wastegate before you sent it to me and said it fully opened at ~18psi
 
Do you have any idea. When I added more preload the turbo built boost slightly faster but if I floor it in 4th gear at 3k it builds boost slowly and then dumps at 10-11psi and holds until whenever it creeps at like 5k. I wouldn't lie haha it's literally beyond me.
 
Unless you have some ridiculous turbine/exhaust backpressure, there's no way the flapper would open enough to be audible at 10psi unless something's wrong with your boost controller which is allowing it to feed a small amount of boost to the actuator.

http://www.dsmtuners.com/threads/fp-green-install-zero-boost.414683/

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Hey I took thay picture a few years ago!! When we first got into dsms we could not boost over 5psi on a bone stock 1G... Removed the downpipe and this is what we found LOL!
 
I'm going to look into the intercooler pipes for blockage with my inspection camera but after that I'm out if ideas.
What do you guys think fp would say about this? There's no way I can pay 1500 dollars for a turbo that spools at 5k and makes no power.
 
I was going back and forth with FP for a while when their MHI 20g turbos were back ordered. They responded fairly quickly, usually within a day, sometimes within a couple of days. Communication was great, and they even hooked me up with a few extras for the delay.

Write the email, explain your problem, maybe even reference this thread. Im sure they will be more then willing to help - at least from my experience.
 
Had a very similar issue using a prototype style turbo with a holset actuator, about 2 months ago. Was only building about 16-18 psi with the w/g line hooked up to BB. The boost also never flatlined on the logs. Than last thing i did was shim the hell out of actuator and run a straight vacuum line for lowest boost.

On the first pull it spoold very slow again while building 15 psi. I turned the car around and went for a 2nd pull and something happened! It started to spool normal and only built 10 psi but the car felt MUCH faster. Now it builds 30 psi running off the BB again. I speculate it was something with the actuator since that was the last thing i touched.


PS i can also vouch for a not so great experience with FP's communications through email. Than i called them once and spoke to a different person, the girl was much nicer to deal with.
 
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The only thing that changed in my setup was the oil feed. I'm now feeding it from the oil filter housing like fp on their site says to. Do you guys think the pressure is too high causing the turbo to drag more?
 
Had a very similar issue using a prototype style turbo with a holset actuator, about 2 months ago. Was only building about 16-18 psi with the w/g line hooked up to BB. The boost also never flatlined on the logs. Than last thing i did was shim the hell out of actuator and run a straight vacuum line for lowest boost.

On the first pull it spoold very slow again while building 15 psi. I turned the car around and went for a 2nd pull and something happened! It started to spool normal and only built 10 psi but the car felt MUCH faster. Now it builds 30 psi running off the BB again. I speculate it was something with the actuator since that was the last thing i touched.


PS i can also vouch for a not so great experience with FP's communications through email. Than i called them once and spoke to a different person, the girl was much nicer to deal with.

Your similar experience gives me a glimmer of hope that I will eventually find something wrong

Here is a pic of my wastegate holding water so I know it's not sticking open slightly
 
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