MAP EF-series Turbochargers results thread
^ i reckon your flapper isn't sealing properly Troy.
It's a PITA but you're gonna need to rip that sucker out to check it, or at least get the dump off
surely freeboosting on a 2.4 will go 40+?
It's a PITA but you're gonna need to rip that sucker out to check it, or at least get the dump off

surely freeboosting on a 2.4 will go 40+?
yeah i'm gonna pull the dump pipe today have a looksie. for sure it shoulda gone 40+ cause even my bbk went 40+. that freeboost even went through fourth gear and only hit 31..
checked my flapper and it's fine, think it's time to go ef3
vdr of my bbk vs ef4, seems like my ef4 spools way late for a 2.4 but when I compare the torque and hp it's actually making more than others here i've compared with, it makes 300tq at 4k and compared to svendiesels map which is at double the boost at that rpm it's making same torque, and I don't even have mivec, so it seems theres nothing wrong with my ef4, just the way it is, besides the fact it won't boost over 33psi with 100%wgdc
vdr of my bbk vs ef4, seems like my ef4 spools way late for a 2.4 but when I compare the torque and hp it's actually making more than others here i've compared with, it makes 300tq at 4k and compared to svendiesels map which is at double the boost at that rpm it's making same torque, and I don't even have mivec, so it seems theres nothing wrong with my ef4, just the way it is, besides the fact it won't boost over 33psi with 100%wgdc
Last edited by burnzy; Feb 1, 2012 at 02:54 AM.
The turbo should have more in it then that. Just looking at the boost curve it appears its not even falling off up top, Which is uncommon on a 2.4. You mentioned your flapper looked like it had moved? any binding? How high did you boost leak test the car?
The flapper seems to be fine I pulled hot side off to check. Was that example in third or fourth Chris? I have boost tested to 25 psi. It doesn't have leaks because my load to boost ratio is fine
Ive had things leak BADLY at 30+ PSI that didnt leak at 25 Just trying to help you cover all the bases.
I always try to check at 30 psi myself when I do boost leak tests. Another thing is too how long does it take for the pressure to leave the system? If it holds up and takes a while then your fine. But if it just drops rapidly then there is a good chance there is a leak still. And I agree with Chris, looking at my unclipped turbo I get 25 psi at about 4400 rpms, 33 by 4700.
Last edited by CurseDSM; Feb 1, 2012 at 05:10 PM.
I will try test higher but usually if there's a leak you can spot it in the engine loads not matching boost. A leak at over 25psi shouldn't be affectin the spool under 25psi though. If it was leaking that bad also the boost/ power would drop as the turbo overruns itself. Nevertheless I will check
I will try test higher but usually if there's a leak you can spot it in the engine loads not matching boost. A leak at over 25psi shouldn't be affectin the spool under 25psi though. If it was leaking that bad also the boost/ power would drop as the turbo overruns itself. Nevertheless I will check







