Jump to content
SAU Community

Boost Spike - Dump Pipe Design For Gt3076r Iw

limpus

By limpus,
in Engines & Forced Induction

 Share

Recommended Posts

limpus Mentor

limpus

Posted
Posted

Good day guys,

I remember reading a thread some time ago about someone wanting to modify their dump pipe for a GT3076R and there were some very useful photos included there...i can't seem to find the thread after 2 hours of searching...can someone point me to that post if possible? I'm having boost spiking issues with me 3076 on a 2JZ and i suspect it could be due to my dump pipe design...

Cheers.

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

got a pic of your dump? i have a bellmouth style dump on my iw3076 and boost control is fine, altho i think its creating way too much turbulence, considering making a split dump for it.

SLAPS Rising Star

SLAPS

Posted
Posted (edited)

Boost spike?

Are you sure its not boost dropping off?

A spike is a really quick spike of boost not where it peaks up through mid range and drops off at top end. Typically related to preload being way too high or a cheap bleed valve.

If your running IW don't expect spectacular boost control if your trying to push more than 2-3psi more than the actuator is rated at. The same goes for the GT35 IW's.

Best bet for the GT30.. Throw an actuator on it that is rated for the boost level you intend to run of which with cams on pump fuel is around 18-20psi. E85 up to 25psi.

If you dont boost WILL peak up then tail off really quick to a couple of psi (if that) above what the actuator is rated to.

Edited by SLAPS
limpus Mentor

limpus

Posted
  • Author
Posted

Yeah...it is spiking or should i say climbing uncontrollably...i'm trying to keep at at 15-16psi but it just shoots up to 20+ regardless...i even disconnected the actuator arm to see if it was actuator related but its not...boost still shoots way up so that rules out the wastegate...the flap also opens fully so its not that...therefore its pointing to the custom CES style split dump somehow not scavenging the wastegate gases fast enough...it seems that most people running 3076s are running a bell mouth type dump too which might be my next step...

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

    • The Bogan
      NC MX5

      By The Bogan · Posted

    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      MR HAMMER has said his piece. Painted up to avoid Rusty Rusty. Actually lines up well. (i.e it lines up the same as the unmolested GTR guard). Turns out the GTR Strut brace does foul on the bonnet vents ever so slightly. May need a little bendy bendy if intended to keep using with a strut brace. So spacing it out to clear the FAST102 is not an option. Annoyingly, the bonnet vents also foul on the heater lines running over the engine. Given this engine does not EVER require a heater, a delete loop is going to be used. Don't worry, the defogger uses the AC. The heater is basically "Do not use the aircon and turn the fan on". It will still be effective, I promise.... once I get the system regassed... Will have to revisit with unvented bonnet I suppose, and suitable strut brace. There's plans to do this and other things tonight and bleed brakes (there was a weep) and put the bumper back on, and take Good Friday morning - Because troubleshooting on the side of the road limping it home at midnight tonight is ... not very smart.
    • GabsReDeal
      R32 GTS (RB20DE) Injectors Replacement

      By GabsReDeal · Posted

      Thank you all for you assistance. I contacted Nistune regarding the support for the RB20DE along with my ECU Code (23710-10U00). They do have a map for it and added the RB20DE as a purchasable option now as well. They also added Malta as a Billing and Delivery options as this was missing. I was honestly amazed at their quick response and action, it took less than 24 hours. I also looked again at direct fit options for injectors, just in case I were to replace them. DeatschWerks seem to use a Bosch EV14 base and makes ones that fit mine at 440cc lowest, but also have 550cc at the same price. I tried looking for other direct fit options and managed to find one (also Bosch EV14 based) which includes a plug and play adapter on ebay. Did a small test with a Noid Light on the troubled injectors and all seems good, so they are pulsing properly electrically. One weird part is that they are missing on the same two cylinders as before I got the injectors cleaned. Mechanic also found this weird as he did not label the injectors and it is unlikely to have the faulty injectors be installed in the same cylinders.  
    • Murray_Calavera
      Exhaust silencers/varex exhausts

      By Murray_Calavera · Posted

      Nice, let me know how you find the 98 tune
    • GTSBoy
      R33 GTS25 NA - Stalling when vehicle is at operating temp

      By GTSBoy · Posted

      Put a hand on an injector and see if that's what the buzzing is. You might be triggering the injectors by moving off idle command.
×
×
  • Create New...