14b Boost Threshold?
07-15-2006, 03:29 PM
#1
Junior Member
Thread Starter
Join Date: Mar 2006
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
Hi, I have a 1.8L beta I engine. I'm using a 14b from a 1st gen Eclipse. Log manifold. 2,5 mandrel bent downpipe and exhaust.
Compression Ratio is reduced via a head spacer (Aprox. 8:1)
The boost threshold RPM is too high. I start to see boost (1psi @ 3000rpm) and full boost (10psi @ 4000).
Does anyone know if this is normal for a turbo this size? I bought this turbo thinking it would spool fast.
Any thoughts??
Compression Ratio is reduced via a head spacer (Aprox. 8:1)
The boost threshold RPM is too high. I start to see boost (1psi @ 3000rpm) and full boost (10psi @ 4000).
Does anyone know if this is normal for a turbo this size? I bought this turbo thinking it would spool fast.
Any thoughts??
07-15-2006, 06:53 PM
#2
Senior Member
Join Date: Mar 2006
Location: Tampa/St Petersburg
Posts: 4,334
Likes: 0
Received 0 Likes
on
0 Posts
Vehicle: Turbocharged 2001 Hyundai Tiburon
most likely have an exhaust leak in the manifold somewhere or your wastegate is opening prematurely. Or your turbo could be done.
07-16-2006, 02:59 PM
#4
Junior Member
Thread Starter
Join Date: Mar 2006
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
I don't think is the wastegate. I ran the car today with the wastegate shut (no pressure line connected) and it just gets worst, it spools even slower (I normaly have a ball and spring MBC which allows faster spool).
That does seem weird though, if the wastegate is shut shouldn't it spool faster?
I'll look for exhaust leaks.
What could be wrong with the turbo? The exhaust wheel seems fine. The housing is ok (very small cracks: common in all TD05Hs).
That does seem weird though, if the wastegate is shut shouldn't it spool faster?
I'll look for exhaust leaks.
What could be wrong with the turbo? The exhaust wheel seems fine. The housing is ok (very small cracks: common in all TD05Hs).
07-16-2006, 06:04 PM
#5
Senior Member
Join Date: May 2006
Posts: 4,722
Likes: 0
Received 0 Likes
on
0 Posts
Vehicle: 2001 Hyundai Tiburon
While that turbo is a little bigger than what came in 2nd gen Eclipse, and I've never had experience with it, I don't think its much bigger than the 2g Eclipse. My Eclipse was basically full boost by 3000RPM easy.
Might just be the manifold design and the fact that the 1.8L is a little smaller than the 4G63T.
Might just be the manifold design and the fact that the 1.8L is a little smaller than the 4G63T.
07-17-2006, 05:57 AM
#6
Moderator
There's something wrong with your setup. I'm spooling a turbo twice as big as yours in the same amount of time.
Any kind of crack in the exhaust will keep it from spooling.
Any kind of crack in the exhaust will keep it from spooling.
07-17-2006, 08:13 AM
#7
Senior Member
Join Date: Sep 2002
Posts: 2,236
Likes: 0
Received 0 Likes
on
0 Posts
^^
the mitsu tdo4's are known for small hairline cracks usually around the wastegate flapper. its been looked into plenty of times, and really isnt a big deal on them.
now heres what im gonna guess is your issue. go over all your intercooler pipes, and double check them, u either have a crack, or somethings loose. pull all of it off, and go over every piece visually. maybe a throttle body boot or something is backing off.
if thats not it, are you sure your exhaust manifold to head is sealed properly, if theres a slight leak there, air will go out that before going through the turbo.
remember, air is lazy, it will go the easiest route.
the mitsu tdo4's are known for small hairline cracks usually around the wastegate flapper. its been looked into plenty of times, and really isnt a big deal on them.
now heres what im gonna guess is your issue. go over all your intercooler pipes, and double check them, u either have a crack, or somethings loose. pull all of it off, and go over every piece visually. maybe a throttle body boot or something is backing off.
if thats not it, are you sure your exhaust manifold to head is sealed properly, if theres a slight leak there, air will go out that before going through the turbo.
remember, air is lazy, it will go the easiest route.