Jump to content
SAU Community

T Piece Boost Controller

shaun123

By shaun123,
in Engines & Forced Induction

 Share

Recommended Posts

shaun123 Community Regular

shaun123

Posted
Posted

hey guys,

i recently bought a turbo tech manual boost controller off ebay, and loosened the screw all the way (0.7bar), however when i have the boost controller installed, my car develops a big misfire...

Is there any obvious cause for this?

mods: bosch 040, turboback exhaust, pod

Link to comment
https://www.sau.com.au/forums/topic/324825-t-piece-boost-controller/
Share on other sites
99 GTT Rising Star

99 GTT

Posted
Posted

I would say 10 PSI and no tune = BAD

Restrictive exhaust would not help and the manual boost controllers are known to spike so could be way more boost and leaning out. (Not a big fan, better to use electric one)

You realy need a tune before you do damage.

PM-R33 Grand Master

PM-R33

Posted
Posted (edited)

You pretty much answered the question yourself "missfire". A missfire is a poor spark, so either your spark plugs need replacing or your 15 year old coilpacks aren't up to the job anymore, or both.

Edited by PM-R33
JonnoHR31 Grand Master

JonnoHR31

Posted
Posted
I would say 10 PSI and no tune = BAD

Restrictive exhaust would not help and the manual boost controllers are known to spike so could be way more boost and leaning out. (Not a big fan, better to use electric one)

You realy need a tune before you do damage.

it wont be running lean. more boost sends things rather rich with the stock ecu and turbo.

as PM-33 said, poor spark. i'm assuming its under full load around 4500-600rpm? if so the most likely culprit are tired coilpacks. can try taping/siliconing them or get new ones. in the meantime you can gap your plugs down a bit.

have a search around here, theres countless threads on this

shaun123 Community Regular

shaun123

Posted
  • Author
Posted (edited)

hey guys thanks for the replies,

i have recently just replaced my spark plugs gapped to 108mm, i sussed out the coil packs and there are no visible hairline cracks etc.. in them.

With the stock boost solenoid, with the exhaust my car runs 7psi <4500rpm, then above 4500rpm it goes to 10psi... and starts to 'misfire' when its on 10psi.

also cleaned the A/F meter, replaced the fuel filter, air filter and reset the ECU.

Edited by shaun123
mad082 Grand Master

mad082

Posted
Posted
hey guys thanks for the replies,

i have recently just replaced my spark plugs gapped to 108mm, i sussed out the coil packs and there are no visible hairline cracks etc.. in them.

With the stock boost solenoid, with the exhaust my car runs 7psi <4500rpm, then above 4500rpm it goes to 10psi... and starts to 'misfire' when its on 10psi.

also cleaned the A/F meter, replaced the fuel filter, air filter and reset the ECU.

the coils may look ok, but may not be ok. try taping them up with electrical tape and see if that helps at all, but my guess is that you'll be up for new coils.

GTRPSI Mentor

GTRPSI

Posted
Posted

Leave your coil covers off and run the engine at night in the dark.

Enjoy the electrical storm.

Id be testing plugs regapped to 0.8mm first though, before you put the coil covers on have a look for sparks arcing around the coil packs.

I also run a smear of dielectric grease on the ends of my coil packs to help stop spark loss on both my GTR and XR6.

Legumis Contributor

Legumis

Posted
Posted

had the same issue.

Fixed by gapping the plugs to 0.8. Also smeared a thin layer of high-temp silicone gasket-making crap around the square block part of each coilpack (theres a thread somewhere in the DIY section), since I had them out anyway.

jordanlisa69 Enthusiast

jordanlisa69

Posted
Posted

gap plugs then put it in 5th gear at 50kph then floor it. if it missfires then it will missfire badly under this load and its gona be your coilpack. just spend about $250 bucks on a set of heavy duty dsr coils. they are some of the best

Marcus89 Proficient

Marcus89

Posted
Posted
gap plugs then put it in 5th gear at 50kph then floor it. if it missfires then it will missfire badly under this load and its gona be your coilpack. just spend about $250 bucks on a set of heavy duty dsr coils. they are some of the best

This sounds like an excessively bad way to diagnose the issues sure it might work but the strain on the motor/gearbox would be stupid. 50kph in 5th and full throttle lol

jordanlisa69 Enthusiast

jordanlisa69

Posted
Posted
This sounds like an excessively bad way to diagnose the issues sure it might work but the strain on the motor/gearbox would be stupid. 50kph in 5th and full throttle lol

Its actully what the mechanics do to try help diagnose the problem. Probly the least stressfull on the engine as well. How would it be more of a strain at 1500 rpm then at 4500 rpm? Takes you about a second to find out how badly its missfiring. And then you can fix it. Unless you want to continously thrash your car finding out how badly its missfiring. And pretty sure it wouldnt have a problem with the gearbox. How would it?

jordanlisa69 Enthusiast

jordanlisa69

Posted
Posted
heavy duty dsr coils? what are these? (other than a crapload cheaper than splitfires and yellow jackets)

I got them off trademe coz im in NZ and my mate has them in his 25det gts4. My engine runs absolutely perfect and i wouldnt have anything else to be honest. Nothing is going to out perform them for how much power i have. PLus they are like 400 bucks cheaper then yellow jacket and stuff lol

mad082 Grand Master

mad082

Posted
Posted

no, you are correct. stock turbo @ 10psi on stock ecu is fine 99% of the time. there will be the odd car that will hit rich and retard at this level, but very few, and this can come down to innacuracy of the boost gauge (may be reading 10psi but the car is actually boosting 11 or 12psi)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • PranK
      My BMW E39 528i touring

      By PranK · Posted

      Thanks for that, I'll check it all out. I can always do the brakes last anyway if its a problem.  The 16's are super cool, if they do fit I'll cruise around with them for a bit.  
    • GTSBoy
      My BMW E39 528i touring

      By GTSBoy · Posted

      Well, that's kinda the point. The calipers might interfere with the inside of the barrels 16" rims are only about 14" inside the barrels, which is ~350mm, and 334mm rotors only leave about 8mm outboard for the caliper before you get to 350, And.... that;s not gunna be enough. If the rims have a larger ID than that, you might sneak it in. I'd be putting a measuring stick inside the wheel and eyeballing the extra required for the caliper outboard of the rotor before committing to bolting it all on.
    • Duncan
      Neil's R33 Gts-t Build

      By Duncan · Posted

      OK, so again it has been a bit of a break but it was around researching what had been done since I didn't have access to Neil's records and not everything is obvious without pulling stuff apart. Happily the guy who assembled the engine had kept reasonable records, so we now know the final spec is: Bottom end: Standard block and crank Ross 86.5mm forgies, 9:1 compression Spool forged rods Standard main bolts Oil pump Spool billet gears in standard housing Aeroflow extended and baffled sump Head Freshly rebuilt standard head with new 80lb valve springs Mild porting/port match Head oil feed restrictor VCT disabled Tighe 805C reground cams (255 duration, 8.93 lift)  Adjustable cam gears on inlet/exhaust Standard head bolts, gasket not confirmed but assumed MLS External 555cc Nismo injectors Z32 AFM Bosch 023 Intank fuel pump Garret 2871 (factory housings and manifold) Hypertune FFP plenum with standard throttle   Time to book in a trip to Unigroup
    • PranK
      My BMW E39 528i touring

      By PranK · Posted

      I forgot about my shiny new plates!
    • PranK
      My BMW E39 528i touring

      By PranK · Posted

      Well, apparently they do fit, however this wont be a problem if not because the car will be stationary while i do the suspension work. I was just going to use the 16's to roll the old girl around if I needed to. I just need to get the E90 back on the road first. Yes! I'm a believer! 🙌 So, I contacted them because the site kinda sucks and I was really confused about what I'd need. They put together a package for me and because I was spraying all the seat surfaces and not doing spot fixes I decided not to send them a headrest to colour match, I just used their colour on file (and it was spot on).  I got some heavy duty cleaner, 1L of colour, a small bottle of dye hardener and a small bottle of the dye top coat. I also got a spray gun as I needed a larger nozzle than the gun I had and it was only $40 extra. From memory the total was ~$450 ish. Its not cheap but the result is awesome. They did add repair bits and pieces to the quote originally and the cost came down significantly when I said I didn't need any repair products. I did it over a weekend. The only issues I had were my own; I forgot to mix the hardener into the dye two coats but I had enough dye for 2 more coats with the hardener. I also just used up all the dye because why not and i rushed the last coat which gave me some runs. Thankfully the runs are under the headrests. The gun pattern wasn't great, very round and would have been better if it was a line. It made it a little tricky to get consistent coverage and I think having done the extra coats probably helped conceal any coverage issues. I contacted them again a few months later so I could get our X5 done (who the f**k thought white leather was a good idea for a family car?!) and they said they had some training to do in Sydney and I could get a reduced rate on the leather fix in the X5 if I let them demo their product on our car. So I agreed. When I took Bec in the E39 to pick it up, I showed them the job I'd done in my car and they were all (students included) really impressed. Note that they said the runs I created could be fixed easily at the time with a brush or an air compressor gun. So, now with the two cars done I can absolutely recommend Colourlock.  I'll take pics of both interiors and create a new thread.
×
×
  • Create New...