AHHHHHH im starting to become very angry by this. First off ill tell you a little. I finally got out of my break in on my motor half bridge ported exhaust all that stuff. I have to4b turbo xs boost controller an a hks 50mm wastegate. The wastegate said it had a 10psi spring in it but i think there full of it. A/F is good 13.4 idle an deep 11s high tens boost. I have a stock ecu piggy backed off a hks fcon I know i should have a standalone i have a megasquirt just not in.

I pulled the wastegate apart an all that stuff there was a little amount of oil in it nothing to be nervous about maybe a dime size drop. Diaphram was still good an the shaft moved freely. Put it all together put it back in an went for a drive. Got on it an almost no boost in first an 5psi in second gear. Dont wanna go any higher like 3rd 4th gear cause im still trying to go easy on the motor for a little. Drove home an checked everything again.

Pulled my boost controller out thinking it was that opened it up ball was clean an spring was still good. Thought ok checked the xs site to double check i had it right. Tryed it both ways by switching the lines. Still nothing. Checked all over for boost leaks an a loose clamp nothing. I even tryed taking the wastegate line off an plugging it still 5 psi. I do have a very very little exhaust leak after the turbo but nothing to cause this much of a loss. Checked the turbo spins free very little shaft play no in an out. what could it be i might just be so angry im over looking something

 

This may seem like a stupid question: but you're not hitting fuel cut are you?

 

you plugged the wastegate and its still not going above 5 psi?

Maybe your boost gauge is faulty. If its a mechanical boost gauge, there might be a leak at the connection hose. If its an electrical boost gauge the sensor is probably bad.

Usually, 3rd and 4th gear pull gets the highest psi, atleast on stock turbos since there isnt enough load pressure from 1st and 2nd gear.

 

In not the gauge, the only other way I can see this happening is with a large boost leak. If you take the line off the wastegate actuator, you should overboost in a hurry. The boost controller ceases to matter at that point.

 

The cZar. no im not is hits 5psi an holds there all the way up to when i shift. an i have a fcd

an no its not the gauge i put it on my friends an when right to 10. I just dont know cause if i have a big boost leak the maf would shut off the car. But i heard that after3k the piggy back is active an the maf stops working an it runs off the pressure sensor. Dont know how true that is. Im going to go over it today an see what i can find. Its just weird cause i didnt have this problem before with the same set up cause i had this hbp with turbo rotors. IT was boost 8psi then i tore it down put s5 na's in an all the matching weighted stuff. Now i cant get past 5psi.

 

from my experience blowing my motor lol. I had a boost leak and tried a manual boost controller without *not knowing I had the leak* "6-port turbo". I keep turning the dail on the controller but nothing seemed to change it would hit 5 psi and hold, around 7 in 4th with my ported wastegate *stock turbo*. Once I found out that one of the nipples I blocked on the intercooler was off and corrected that. Later that night without even testing it. I threw it in 3rd on the highway and it pulled like a ****. I wasn't thinking to look at the boost gauge but I would say around 10 - 12 psi. Once I shifted to 4th, it was over. Apex seal at it I assume. Limped home on one rotor. So from my experience a leak can hold boost just fine, just not up to its full potential.

If my setup matters... s4 6 port turbo with tII ecu, afm, boost sensor, and afc. 550cc, pri 720cc sec, 2.5" downpipe, no exhaust

 

ITs cool man thanks for even replying to my post. Idk you would think that it would atleast be a leak you could hear im going to go over it tomorrow night before out rx7 meet an see if maybe i can find something wrong. i checked all my vac nipples on the sides of my uim an still couldnt find any of them off. maybe its one under the manidolf. Im thinking that my uim to lim might not be fully sealing

 

do this... clamp the line on the wastegate to see if you can boost above 5psi.... if it you can then its something with the vac lines.... or contoller solenoid. if it takes a long time to boost above 5psi... you have a major boost leak, at that point check you exhaust manifold and the turbo to see if everything is on right, or worse..... your turbo is no good.

 

did that. i pulled the line off the wastegate an pluged the vac like an still nothing over five. the turbo does have up an down but its not even enough to efect it. i checked everything an no vac leak im thinking maybe on the block to intake gasket. im pissed cause i almost got beat by a camaro lol

 

eBay turbo or otherwise? Real HKS wastegate?

I've seen a similar problem with eBay wastegates. They don't hold very well.

 

aaron real wastegate ebay xspower turbo. i found one thing today though my msd box is going out so it was cutting spark at high rpms. as for the 5psi still the same i seen 8 today but only once. i dont see how my wastegate could be bad i tore it apart an nothing was torn damaged or hard to move.

 

also i went over this thing with a fine toothed comb an theres no vacuum leak. non that i can find an if i thought i did sealed it up. i gained 1hg that was it so now im at 11hg of vacuum not 10 lol.

 

ok im pissed now i went over everything possable. Gaskets tightened all my ic clamps still nothing. Now when i get on it it gets to high rpm an stumpels. Like a little hesitation not like bucking but you can feel it. Also it will go 6psi an drop down as im boosting. Im going to pressure check everything tonight. I even changed my plugs nothing pressure sensor checked all my wires at ecu to piggy back. AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH lol. I just wish i was not cursed hahah... ill get back with some updated info see if i find anything

 

Have you tried running no controller? Just put the hose from the compressor side straight to the wastegate and see what it runs?

You could also try disconnecting the hose to the wastegate. Then drive very very carefully and see what it does.

Also, you can check for boost leaks by using an air compressor to pressurize the system with the engine off.

 

wankel7 yeah i even tryed pulling the line off wastegate.. i think i might have found it today i pressure checked the ic system an found on under my bumper had two little wholes in it so im hoping that was it

 

i have seen an HKS wastegate stick open.. had to unbolt the diaphram cover and smack the valve with a mallet to free it up.

 

na im 100% sure its not that i have my wastegate dumped to atmospher it would be screaming all the time at me lol... but i need to go get a coupler to make sure that it was just that hole i had in it

 

ok so im getting closer. i found a leak on my hot side of my ic its lame trying to find a leak on a fmic. But anyway dove it still did the same thing i feel a little better responce. im going to recheck my ic system tomorrow was getting late didnt wanna leave my garage open with all the lights on at 10pm on a thursday.im thinking i might have my fuel pressure to high but i dont know if that would effect high rpms. its almost like fuel cut but at 5psi ill check it tomorrow an let you all know cause i know this is a on going thread through out the club.

 

Wait, you are running a stock ECU?! I totally missed that in the first post.

Are you sure the hack of an FCD is installed correctly? I've seen them set up wrong, causing the ECU to dump fuel all the time. With a misfiring engine, the wideband may not read correctly.

A tiny boost leak won't cause an issue like this, seriously. You'd need a gaping hole which you would certainly notice.

 

have you checked timing?

 

im pretty sure the fcd is in right i got rid of the one on the fcon an im using the racing beat one. im confused as what people are talkin about to the pill in the pressure sensor i never had one in mine or the car i got the turbo motor out of like 3 years ago i cant remember if it had one. i dont know if its like a one way check like the green check valves on the rats nest or what.

but i have my timing set to what aaron told me to a while back. i think it was like 18 an 15 split. aaron this is atdc right also is that good hbp or full should i cut it down a little sence im half. or no. i found another leak today but it still when it hits boost its like a brick wall an just does not want to go any higher than 5psi an its starting to feel like a hesitation then goes away then back so on. ill take a video an show everyone what im talkin about

 

So what does your AFR gauge do when you are banging against 5 PSI? What is timing at that point?

How are you setting timing anyway on a piggyback? I'm not familiar with the FCON. Isn't it just a fuel controller?

 

timing is what you told me to do a while back. My afr when it under boost is about low 12s high 11s.

 

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its a very crappy video but you can hear it at about 4700 5500 an almost 6 cutting