StinkyTurbo

Well in September I found a smashed up T2 at a Newark junkyard & decided to take the engine, wire harness, & ecu. I bought a rebuild kit for the engine & I just got around to finishing the rebuild around 3 weeks ago & put it in the car. I attach on to it a fmic, & Turbo Xs High Performance Manual Boost Controller. So I've been breaking in the engine for the last couple of weeks & yesterday my boy needed to pickup a Type R motor in Camden,Nj so I volunteered my Rx7 to pick-up & the carry the motor. On our way over there(my friend is driving) I see a red Nissan Sylvia on the highway & I just can't resist & decide to test the motor. So I tell my friend catch up to him & rev the engine & it begins. We both hop on the NJ Turnpike & wait for traffic to clear up & he starts by honking his horn 3 times & we go from a roll. Immediately my friend down shifts from 3rd to 2nd & got a car lead on him instantly & were estatic when on how fast my rx7 jumped & I even got giddy like a little car. But this is when the crazy **** happens. He's racing & my car starts redlining at 6k rpms & he lets off the gas & me & my friend are like what the ****? So I shift to third & the Sylvia passes me & at this point I dont give a **** & just wanted to know what the **** is up with my car. So hes driving & the boost gauge immediately catches our attention. The boost was at 20psi at 5k rpms in 4th gear & immediately I think of the engine & the turbo blowing up like a grenade & tell him to let off the gas. He does & lets it drop to around 3k rpms in 5th gear & the boost goes down immediately to like 2psi & cruise all the way to Camden & back. This scares me because when I first connected the boost controller it was boosting to around 10psi & I tried to fix it & frop the boost to around 6psi & thought I did but when in reality I actually raised it. I followed the instructions & everything & I still dont know how to use it. Please help.
Below is the website with instructions on how to set the boost.
http://www.turboxs.com/HPBCinstallation.htm

BlaCkPlaGUE

So your using the stock turbo?

If so the wastegate is to small, and you forgot to mention that you have no cats or a straight exhaust. This creates boost creep. Theres so much flow coming out of the exhaust port on the engine, that the 15mm wastegate port is not enoughe to bypass the gasses enoughe to spin down the turbine.

At 20psi, your friggen damn lucky nothing happened to the engine.

StinkyTurbo

I have a single pipe 3inch exhaust(full of holes) with a gutted cat(which is the same as having no cat). Im gonna port the wastegate a little bit more then. But still, how do I tune the boost controller.

At 20 psi I do consider myself lucky because Im running on stock injectors, stock t2 ecu with no fuel program because some ding-a-ling broke into my car a week ago & took my Super-Afc.

DC350

You can't tune the boost controller, its just controlling the amount of vaccum going to the wastegate (I think) Its just the wastegate that is making you spike... Weld on a larger washer onto the wastegate flapper and make yourself a 40mm wastegate... Look in the 2nd gen archives.... NZ convertible has a great write up


Edit: Do you have an FCD? (Fuel cut defencer)

StinkyTurbo

Yea I have a FCD.Im going to look for NZ convertible write up.But on a better note, is there anyone else using the a Turbo Xs boost controller.I just want to get the boost down to 6psi. I hate driving & having to look at my boost gauge & worrying about overboosting.

elfking

Are you sure you have the Boost Controller hooked up the right way? Im not trying to insult you but I hooked up mine backwards on my Galant VR4 once. The boost pegged right over to 20psi (Man that scared me, not the motor poping just being thrown in the seat like that!), I of course imidately let off the gas and switched it around. But if its hooked up backwards you're wastegate will not OPEN! On the Turbo XS website they have diagrams and explinations on how to set it all up.

You didn't mention if it was working properly prior to this incident. Thats why I mention it. The Turbo XS controller is also pretty sensative on the adjustments from what I have noticed. Not even 1/4 turn on the corse screw and I go from 10 psi to 16psi. Then you have to use the fine ajustment to find you're place.

StinkyTurbo

I guess it is put on the right way because it was at 10psi before & then I started ******* with it & trying to drop the boost & instead it went up to 20psi when my friend was driving.

Digi7ech

iTrader: (1)

YOU ARE MISSING THE POINT OF A BOOST CONTROLLER

Boost controllers can only RAISE boost pressure.
They manipulate the pressure reference to the 5psi spring on the wastegate.
This makes it so more pressure is needed to open that same 5psi spring.

If you want top run 6psi then you need to PORT THE LIVING **** out of your wastegate so you no longer have boost creep(wastegate cannot releave all the exhaust causing the turbo to spool higher than desired).
Then remove the boost controller and let the stock wastegate spring do it's job.

I have the boost controller but have yet to put it on because my wastegate boost creeps like a ****. I run 7psi up to 5k rom where it creeps to 10-11psi. Once I port it I can run 10psi daily w/out worry.

YES you are lucky you didn't blow your motor.
The stock injectors can only really handle about 10-12psi via stock turbo. ALthoguh I have accidentally spiked to 15psi and still had an engine.

PLEASE search for fuel upgrades before even thinking of upping your boost. you WILL blow your motor eventually and if you run 15psi or more boost then you'll be rebuilding your turbo soon as well.

StinkyTurbo

Duh. But the only thing thats bothering me is why when I first put it on, it was at 10psi & after I fucked with it trying to turn the boost down to 6 or 8psi, it just went 20psi. All Im gonna do tomorrow is **** with the screws & try to get it back to 10.

alwayssideways

if im not mistaken ,, a boost controller wont really help if your wastegate cant vent the extra gasses,, you need this

StinkyTurbo

What did you do??

alwayssideways

this was done from the NZconvertable write up on porting your wastegate.. if you do a search you will find it easily. he has before and after pics. but here is what it looked like after a mild port. my first try out porting


basically you have to mill down the surface where the wastegate flapper meets the manifold. then you have mill out the area around the flapper so you can weld on a bigger flapper. then you increase the size of the hole ,, aka porting your wastegate. i think i paid roughly around what he paid to have it done. i paid 75 to have it machined and welded. NZ had a friend weld the washer onto the flapper for him so he saved some money there.. but its a good mod to better control boost. before i did this i had some really bad spikes of 15 psi .

StinkyTurbo

Hmm I'm gonna take off the turbo tommorow morning & see what I can do.(Sorry for the sig. Just wanted to test it out.)

Digi7ech

iTrader: (1)

take the boost controller off your car.
There is no need for you to have it unless you want the boost to come quicker BUT to creep WAY beyond that psi.

I do 8-11psi with absolutely NO boost control at all other than the stock wastegate.

I just read my boost controllers manual and it just said turn it clockwise to make the boost decrease back to stock levels.

neu

if you are talking about the dual stage boost controller, you might have wired it wrong... you might be running that 'high boost' setting... if not, break out the little allen wrench it came with and turn it a bit... if it's the one im thinking of... just be carefull... should test all that before you hop in the car for a drive, check the toggle switch and all that (if it is dual stage) make sure you got it wired up right.