ok, disabled my double throttle and added a GreddyTi exhaust and now i have some severe boost creep. As soon as the second turbo comes online boost goes up to 12+ psi instantly. I also have a dp/mp and a power fc but i have my boost set at 10 psi, so i was loking to have my wastegate ported, was wondering who/where i should go to have it done. Thanks in advance. steve

 

take it to a machine shop. Tell them to port the WG to 1.24 And be sure to let them know to match the port to the WG flapper/door

 

Hows the exhaust sound? I'm still debating this and the RB dual-tip. You could also have the PFC tuned for the increased boost.

 

thanks rx7wishing.

klar , i like the greddy ti , i had an rb single tip before , the greddy is LOUD , its very loud especially with a midpipe. but if you cruise at around 3k at the right throttle position its not too bad

 

PFC can only do so much. If the stock WG port cannot manage to let enough exhuast by-pass the turbine your gonna get boost creep...no matter what type of EM you have.

 

Yes, but it can be tuned to run the higher boost. IE: more fuel.

 

But why try and tune for boost creep? Boost creep isn't reliable boost.. Depending on weather conditions creep can be more severe.. ITs not worth spending 5K on a new motor when you can spend some bloody knuckles and a 100 bucks on a WG port.

 

Eh. True, or you could keep you foot off the gas and your eye on the boost.

 

also , wanted to know do i need to port both wastegates??

 

There is only one wastegate.

 

yea i was thinking of the 2nd turbo gate. does that need to be ported or no?

 

No -- no need to port the gate near the secondary.

Are you sure you have boost creep? If it shoots to 12 instantly, it might be a control problem. Creep usually manifests as a slower uncontrollable rise as you rev out. Like 10-10-12-14-16. I would suggest carefully adjusting the PFC boost settings (set the duty cycle low) and see what you get. It might not be creep at all.

But then again, it could be creep.

-Max

 

well i am figureing the instant shoot up is a boost spike , i bought a profec b spec 1 to control that. but even before i removed the throttle plates and put on the new exhaust i had a gradually building boost that would reach 12.5psi by 6k rpms. now i think it is spikeing and i have creep. i have a 2.5" restrictor plate in the exhaust and it doesnt seem to be doing me much help at all. porting the wastegate is a definate for me within the next few weeks.

 

The fact that you have a 2.5" restrictor already and still get that crazy boost rise leads me to believe something else is wrong. Here is what I suggest:

- replace the hose that goes from the primary turbo compressor outlet to the wastegate actuator -- make sure the new hose does not have anything in it (no pills) and goes directly to the actuator (bypassing anything else you may have plumbed in there)

- plug the other nipple on the wastegate control solenoid so that it can't vent any air out of the actuator

- It might be a good idea to try blowing into the wastegate actuator at this point to make sure you aren't leaking air. A leak would indicate a bad actuator (ripped diaphragm) and you'd need a replacement. Leave one nipple plugged and use another hose to blow into the actuator. Be sure to reconnect the hoses before you go for a drive.

- Drive the car and see what kind of boost you get. If the boost is reasonable at this point you have a control problem that needs to be fixed before you will know if you have boost creep.

You might still have boost creep, but it just seems to me like something else is going on from your descriptions of the car's behavior. And it still makes sense to port your wastegate and hopefully get rid of the restrictor to maximize your power output. However, I suspect that you would find the same problem once you get it all back together unless you address what seems to be another problem with the wastegate control in general.

-Max

 

well i know for a fact i have boost creep , from before. i forgot to mention , when i disabled my double throttle , i also did a silicone vac. hose job. as for boost i noticed that i am only hitting .57 bar ( 8.26 psi ) on the first turbo . as soon as the second comes online it jumps to .85 bar ( 12.32 psi ) to me now it does seem to be a control problem. maybe something with the pre-spool. i changed those to silicone hose, i dont remember if i put the pill in there or not. before all of this i had 10-8-10 psi pattern , i do also have a pro rx mbc..

 

wow you really owe max he's going all out for you

you need to make sure you have the precontrol pill installed and remove the wastegate pill and your manual boost controller for now and try it.
After that if the boost is in check see if you can remove your 2.5 restrictor and still maintain the correct boost. creep is where your boost will be lets say 10 at 5500rpms in 4th and then as you get to 6500 its 11 and 7000 12 7500 13. If it was a boost control issue it would fly to that boost creep happens slowly as you increase airflow by getting into higher rpms. 4th is a nice gear to slow things down and watch everything unfold.

 

You don't have a creep problem, you have a wastegate control problem.

As the others have said creep happens when boost continues to climb at high rpm. You don't have creep, you have a system that is holding boost settings you don't want.

 

yep, the guy who started this thread is confused as to what boost creep really is

I recently upgraded the piping/connections to my M2 med IC (plus I'm running a full exhaust) and now in cold weather I'm getting major creep (it wasn't bad before), it's kind of out of control....I have a manual boost controller dialed all the way out....when the primary hits I have 9-10 psi immediately and then at full throttle it just keeps climbing....within a 4-5 seconds I'm nearing 15 psi and I have to let off

pulling the manifold to port the WG sounds like a major PITA....I told Rotorsports to do it when they replaced the motor and they told me they "couldn't do it"

 

no i know what the difference is between creep and spiking , i previously had creeping , when the boost increases slowly as rpms go up, i had put a restrictor plate and that was all set before. now i think my problem is in the precontrol. i dont remember putting in the pill when i changed the line to silicone. i will check that today and will update.

 

ok update. still only making 8.5 psi on the first turbo. and i noticed that i didnt even change the precontrol line. so the pill is still in there. could anything be wrong with when i did the vac hose job? i checked and re checked all the hoses before i put it back together. kind of lost right now...... any help greatly appreciated.

 

still haveing boost issues.....but now its a bit different. i still only have 8.5 psi on the primary turbo, but sometimes when the 2nd comes online it only hits 5 psi and i can hear the boost being lost somewhere. it makes a whooshing sound. checked for boost leaks didnt find any. also it does not make the wooshing sound on the first turbo only on the 2nd turbo. now if i bring it up on the highway i can get the 2nd turbo up to 11psi , but only sometimes. so i am a bit lost. could it be my CRV , or maybe the (solenoid/vavle) in the y-pipe that opens the air for the 2nd turbo?

 

Did you check the elbow going to the bottom of the intercooler? It is covered by a 2 piece metal elbow. It takes a 10 mm socket to take the hose off the intercooler and cross over pipe and also a 10 mm socket to remove the metal reinforcing elbow. CAREFULLY check to see if it is bursted, usually it's quite obvious cause your finger will go right through the seem.

 

yea i checked all the couplers. i have a greddy smic in there right now.

 

Did you crack the cross over pipe? Or did the aws pipe pop off the elbow? Did the stov BOV or CRV pop off the y-pipe? or is the y-pipe o-ring leaking?

 

i changed the cross over pipe to a efini y-pipe , so it metal now. also i removed the aws when i got my greddy elbow. i have an hks bov so im sure thats holding ok. the crv was sercurely in place but i will re-check it. maybe the o-ring is leaking , i will have to check that.