got tuned for 24 psi on my evo 9 fp red turbo

however last week when i was driving i drove the car at WOT to make sure everything was running properly and i saw that the boost was hitting 20psi then slowly reaches 24 at higher rpms (6k-8k)

i am almost sure that the fpred 84mm turbo is suppossed to hit full boost at around 3800 - 4100 (from wat i saw on the forums wit peoples experience wit fpred turbo)

i dont have a boost leak 100% sure

i was told maybe the 0ring on my hallman manual boost controller cud be bad ??

lookin for some anwers here bc i dont know why this could be happening now outta no where

PLEASE HELP !!

 

????

 

wow noone has any insight on this ??

 

Manual boost control?

Doesn't give u a lot of options to compensate for your situation. Doesn't the Mivec alter things at higher rpms, might be your Volumetric efficiency changing at those RPMS causes the boost creep.

Basically your are tuned at 20psi via the mbc and it has creep to 24psi.

 

Your turbo is set at 20# peak boost level and then it "creeps" to 24#. The tuner set the peak boost level at the desired 24# to protect your engine from going boom. Now, you just need to eliminate the boost creep.

Once you solve the creep issue then your turbo will peak at 20# and you'll need to increase boost manually back up to your 24# target level. You may even need to get a retune once you eliminate the creep issue.

 

i dnt get why cars r tuned like this my car is running like a ***** at 20psi and i didnt buy a fp red 84mm to get it tuned at 20 psi and slowly creep to 24psi

wtf man im starting to get pissed off wit all these hack *** tuners in long island !

 

and to be honest i dont even think my tuner scaled my injectors either and the car is STILL throwing up running lean codes after i saw him to double check everything and he told me "it was fine"

are there ne honest tuners out there !?

 

I share the pain my friend. Let's see what can be done.

Regarding the boost creep. If your wastegate can't adequately divert the high energy exhaust around the turbine, well, you have to port the wastegate (dremel) or add an external wastegate.

Since you're on a manual bc, perhaps it's not opening 100% at 20psi. To verify that your WG does have the capacity to limit your boost, simply take the mbc out of the loop , go for a run, and see your WOT boost. You shouldn't make high levels of boost. If the boost holds lowish...say <20psi max, I'd say your WG is big enough and the prob is with the mbc.

Then...get a better controller.

 

Dinok,
I understand your frustration, but try stepping back for a min and think of some possible solutions. The tuner did his job, and sounds like he made it safe for ya even if u creep to 24psi.

My guess is that its 1 of 2 things; either boost creep from 20 to 24 or u actually have something limiting u from hitting 24 (mbc or wga preload)
for both cases, I would check the following in the order u prefer:
1) Try swapping ur mbc for another one, start off when its totally closed and slowly open it up till u reach the desired psi.
2) Check the preload on the wga (waste gate actuator). if ur wga is setup "too long" meaning ur the wastegate flapper is slightly open/loose then that means ur not allowing the hotside to build enough pressure to spin the wheel to get the 24psi quick enough.
3) I know u mentioned u did a boost leak test, but at which psi did u run the test? it is also a possibility that u might have a leak somewhere that is not appearing until it hits 20psi +......won't hurt to recheck. I assume ur using tbolts instead of the warm clamps.
4) Check all the nuts and bolts on the exhaust system for any potential exhaust leaks (manifold, o2 housing & the vband clamp between the comp. and the hotside) that might effect the pressure build in the hotside.

gl and hopefully u get her sorted!
A

 

ughhh man i just want the ****ing car to run right !!!

this is a sign NEVER GO TO LONG ISLAND SHOPS !

id rather go to a junkyard shop lmao

 

and it creeps to 24psi at 7,000 rpms wtf !?! my turbo used to hit full boost at 3800 not 7k i didnt want a pus*y tune if i wanted a sdafe tune i wuda kept the stock turbo not this fpred 84mm to be run on 20psi till 7k

 

have you logged this occurence?....boost gauges are trash

 

Dinok, if u feel like porting the WG or notching the flapper (30% more flow) here's the detail:

http://members.tripod.com/alexander_grabau/id18.htm

I disagree with the last poster that boost gauges are trash. Modern electronic mapsensor units are quite good. In fact your ECU uses similar mapsensors to run the motor, and it does it just fine.

 

I am in the same exact boat man to a T right now. Here is what im going to try. I was told it was the O2 housing i have( BR ported and coated) which i had already changed from my old proven megan that i ported based on the tuner sugestion. So im runing the Forge WGA and now thats what he thinks the problems is. So im going to put the stocker back on and try that with a MBC. If that dosnt work im assumming my flapper is totaly screw up and im going to have buy a new hot side or else buy a new stock turbo. Im to the point also where i want to sell off all my parts and go back to stock with just an intake tbe and a tune. All any one ever brags up is how fast the fp green spools and mine runs exactally like yours. I have the best possible set up for spooling too, i maxed out the fp setup and the car is complete trash.

 

if its stopping at 20psi then creeping to 24psi.. that means the controller is just turned down and then the wastegate preload is causing it to creep. what happened when you tried to turn the hallman up more to hit the 24psi?

you will get creep if the controller isnt turned up enough and the WGA is preloaded a lot.