Jump to content
SAU Community

Dropping Boost. Cant Find Why

R33GOD

By R33GOD,
in Engines & Forced Induction

 Share

Recommended Posts

R33GOD Grand Master

R33GOD

Posted
Posted (edited)

just curious to see how much preload people are running on their ajustable actuators.

i had a problem of apparently not running enough which is why my hiflow could only hold boost at 13 psi.

im getting a retune next week. from 3/4 of a hole of preload i have now loaded it up to 1.8 holes.

what do u guys reccommend as safe preload on a rb25 bush bearing hiflow or any type of hiflow

thanks :)

Edited by R33GOD
Link to comment
Share on other sites
RedDrifter Experienced

RedDrifter

Posted
Posted

Simply, the more preload the more boost.

Ive messed around with mine on the GTRS tubo and have it preloaded to run 18psi atm. I ran it for a weekend with the preload to run 25psi and it held the boost perfectly. Just shorten it till you get your desired boost level and see how you go.

Link to comment
Share on other sites
limpus Mentor

limpus

Posted
Posted

RedDrifter is pretty much spot on...just keep shortening the rod...you will find that as you shorten the rod boost response improves...it will reach a point when it will be optimum and shortening the rod more will cause boost to spike...from there you can raise your boost further by using a boost controller...while shortening the rod more will give a higher max boost...it will probably start to spike more too...plus what you really want is for the wastegate flap to stay shut till you reach your desired boost level which won't be the case if you continue shortening the rod as the flap will start to creep open at some point...

I'd be more inclined to adjust the length of the rod till you get good boost response without spiking...then raise the boost with a boost controller...

Link to comment
Share on other sites
R33GOD Grand Master

R33GOD

Posted
  • Author
Posted

it spikes to 15 with the rod ajusted to 1.8 holes then comes back down to 12psi. if i tighten it more should the spike be lower and it will hold say 13-14 psi?

but dosent shortening the rod kill the turbo also? shouldnt the boost controller do the rest? or is the reason why its spiking is because i need to tighten more?

confused

Link to comment
Share on other sites
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

How does it kill the turbo?

Its just controlling the actuator. A turbo makes boost, thats it. Only thing that will kill is it objects that shouldnt be there or poor oil/water supply etc.

Gate preload works the same as ext gates and spring rates.

Spiking will be due to the fact its int gate, get a boost controller. Sometimes spiking cant be controlled just off the actuator accurately depending on the setup of the int gate, how big the hole is and so on

Link to comment
Share on other sites
R33GOD Grand Master

R33GOD

Posted
  • Author
Posted

ive got a hdi boost controller in it now but i have to get it retuned so i can up the boost more. i just dont get it. its a hiflow. how come its droppin boost so much even though the preload is set at nearly 2 holes. grrrrrrrr

Link to comment
Share on other sites
limpus Mentor

limpus

Posted
Posted

It might not actually be "dropping" boost like you think...its probably set to run 12psi and its spiking to 15psi...try lengthening the rod and then upping the boost via the boost controller...although bear in mind that a slight spike is normal as it is a mechanical system and it needs time to stabilize...

Link to comment
Share on other sites
R33GOD Grand Master

R33GOD

Posted
  • Author
Posted

car will not hold boost at all. we tried ramping it up to 20psi but still drops down to 13 psi. damn this car.

these are the turbo specs i got from mtq

Exhaust side

.63 a/r

51.00mm exd.

Comp side.

.60 a/r

55.4mm ind.

preload was set to 2 holes also!!!

wtf is going on

Link to comment
Share on other sites
R33GOD Grand Master

R33GOD

Posted
  • Author
Posted

got the problem fixed. leak in the boost controller fitting. we reached 14 psi by redline. tuner said i need a ebc to hold more boost in future.

result 221.5rwk on 14 psi. on 11.7-1 a/f ratio. nice n safe

Link to comment
Share on other sites
R31Nismoid Grand Master

R31Nismoid

Posted
Posted
think before you type.

thats a load of crap....

read the part after the comma please, matter of fact... read the sentence after it as well while your there.

it said (incase you still miss it)

get a boost controller

And what did he post later on? He needs a EBC to help control the boost.

Funny that. Picking one section of an entire post is useless when the rest of the post gets the point across.

Maybe read posts twice before you type?

Link to comment
Share on other sites
miragev Newbie

miragev

Posted
Posted
it spikes to 15 with the rod ajusted to 1.8 holes then comes back down to 12psi. if i tighten it more should the spike be lower and it will hold say 13-14 psi?

but dosent shortening the rod kill the turbo also? shouldnt the boost controller do the rest? or is the reason why its spiking is because i need to tighten more?

confused

whats 1.8 holes ???

i have about 8-9mm preload on my 2530 turbos on my 32gtr any less and it won't hold boost even on low psi

i have just got a new set of uprated hks actuators so we'll see how much preload i need to put on these

even with 8mm preload on the standard actuators that came with the 2530's they still open at 13psi without the boost controller switched on i can't believe how much force is behind the wastegates even at 3-4 psi of boost

Link to comment
Share on other sites

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

    • Duncan
      2020 Nissan Skyline 400R V37/Infiniti Q50 RS insurance in NSW

      By Duncan · Posted

      Yeah they sure are available for import now, its great news Matt, You need an import specialist insurer, nothing has really changed over the years about the mainstream insurance companies not touching them. I have my cars with Lumley (same group as NRMA etc) because they insure imports and have a good concept of "stable use" where as long as no more than 2 cars are being driven each day you can have them all on a good rate, I've also had no issues with claims through them. Note they won't insure a car if you take it to the track, even for an off track claim. Shannons are another option but I had a lot of trouble with their claims (they were happy to take the premiums, not so keen to pay out), and I'm sure there are other import specialists too 
    • Rezz
      Do You Play An Instrument?

      By Rezz · Posted

      I'm a lifelong home drummer, was in a couple of bands as a teenager/early 20's then moved to Japan and didn't play at all until 2019 when my missus and I were invited to check out the band room upstairs at a restaurant cafe here in JP. They had a full acoustic drum kit and they let me have a bash for about 20 mins. I went away from there wondering how I could not play for 19 years.... Missus bought me a e-drum kit a few weeks later (Yamaha DTX402) which is basic but lets me play at home in my tiny Japanese house.  Also have an Epiphone Les Paul and little Vox amp and delay pedal I bought for the missus because she wanted to learn to play the guitar, but she never got into it. That was about 8 years ago. I taught myself to play some 80's U2 song riffs like the Fly solo, etc and some other things but being a drummer I don't really have the dexterity in the fingers lol. Ham fisted if you will. So I kind of just mess around with the guitar rather than try to seriously play complete songs. My son on the other hand inherited all my side of the family's musical talent and is a brilliant classical pianist at 16 years old. He'll go on to do something in the music industry here for sure once he finished his schooling. I got him a Yamaha NU1XA hybrid piano earlier this year.
    • Rezz
      R’s Meet - Fuji speedway 2024

      By Rezz · Posted

    • Kinkstaah
      Blow Off Valve Is Causing Car To Stall!

      By Kinkstaah · Posted

      If the BOV is plumbed in as mentioned, like stock.... why exactly would it stall? It'd be like stock. Do stock cars stall with stock bovs?
    • Dose Pipe Sutututu
      Blow Off Valve Is Causing Car To Stall!

      By Dose Pipe Sutututu · Posted

      You mean a rich spike, as the air has been metered multiple times due to the turbulent air, you end up injecting more fuel causing a momentary dip in torque and quite possibly a stall event. TL;DR, install a Haltech Elite or S3 or R3, convert to DBW, throw all ancient shit into the bin and enjoy the car.
×
×
  • Create New...