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Posted by spawn87, May 25, 2009
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum.
port the hotside some more?
or a MAFT set up?
Those turbos as stated should be spooled around the 2800-3200 rpm range.
If yours isn't spooling until after then you have some good pre-turbo exhuast leaks. Make sure all your bolts are nice and tight and that your gaskets aren't bad either.
But it's more likely that you have boost leaks, do a boost leak test first, it should be regular maintenance on a turbo car.
+1. These intercooler hoses are old and worn down and tend to start tearing and cracking over the years of use. Do a boost leak test asap.
An exhaust/wastegate leak makes a lot bigger difference than any boost leak.
Make sure you have no exhaust leaks, if you don't you may have a cracked turbine housing by the wastegate flapper. It could also be a boost controller issue, or your cam timing could be off.
well i know its not the timing cause i just got everything done at a my friends shop... and when i ported the housing the cracks were minor but i might of ported the w/g outlet a little to much that could be the problem...
and i also know its not the exhaust cause i just had it checked and put new seals everywhere
but i think if i shimm the w/g and spray it with wd40 it might be a good place to start
i will boost leach tested tomorrow at work and let you know how it went
I'll pm you my Paypal account info
But yeah as said do a boost leak test, double check there is no pre-turbo exhaust leaks
Have you done any porting to the turbine housing or manifold?
i only ported the hotside of the turbo
I would port the manifold collector, like remove the step for sealing ring as well if its not done on turbine housing.
Check out vfaq.com for some how-tos.
Originally you said that you're " not feeling pull till 3500rpms" Could you be more specific in terms of psi/rpm?
what i mean by this is that i don't feel the turbo kick int till about 3500 rpm... i have it set at 15psi...
i ran a boost leak and Nada everything is OK...so i shimmed the w/g and wd40 the actuator arm but have not ran it yet cause my radiator cap broke and need to get a new one... i will post on this later on today to see if i might have fixed the problem
for what ive read i expect to feel the car pull at about 3k.
Feeling pull and "peak torque" are two different things. Yes the 14b should spools very fast and should definitely hit full boost in 3-3500rpm area. Peak torque will occur later in the rpm band though.
To the OP: What gear are we talking about? If you are at WOT at a low rpm, Where are you hitting your 15psi?
i tested the system to 18psi
im running 15psi and i hit that at about 3200-3500 rpm
after that i feel peak torque at about 4k
so if what you say is true then im doing ok then
Sounds about right.
You may be able to cut that down a bit with porting the inlet of turbo and collector of manifold. It may be hardly noticabe though.
If you had a fuel/timing management system, you could tweak some more out of it, too.