Jump to content
SAU Community

Recommended Posts

Hey,

When i had my standard rb20 turbo with full exhaust and intercooler, the only boost control i had was the factory rb20 actuator.

With this setup it would leak/spike to about 13psi (from the factory 10psi setting)

This was most likely due to the larger exhaust flow making it creep up to 13psi.

Even using a manual bleed valve, it wasnt able to go below 13psi...

After i put in a hks2530 with the same rb20 actuator, it spikes now to 15psi...

Is there any reason why it isnt holding itself at 10psi?

Plenty of r33 owners put on rb20 actuators on their car's and hold 10psi..mine seem to be all over the place haha.

Im pretty sure the wastegate flap was checked to see if its not getting caught on the dump pipe (as it is a split style)

So yeah, is it normal for it to spike to 15psi on standard actuator? Car will eventually be tuned to 17-18psi using a manual bleed valve.

Thanks

Link to comment
https://www.sau.com.au/forums/topic/253541-rb20-actuator-spiking-to-16psi/
Share on other sites

A bleed valve is going to make it higher.. its bleeding air so the actuator doesnt get the "10psi" doesnt it? So that wont help

Maybe the actuator rod isnt long enough on the HKS turbo? So its only opening half way or not quote fully?

I thought the HKS turbos had their own actuator?

Like these ones

rangerover047ff8.jpg

EDIT: i just re-read it. You have the split dump.

I had that too, and with the RB20 actuator on my RB25 it would creep to 14-15psi.

I know for sure it wasnt catching either as i had it modded so it wouldnt.

It sucks, but put a stock dump pipe on and try it. As soon as i put my OEM dump pipe + HKS front on it dropped to a perfect 10psi all day every day.

SAU will love this! This is my theory...

SlitDumpFail.jpg

What you think?

Edited by gotRICE?

haha nice drawing.

The HKS2530 was purchased 2nd hand without a hks actuator. The turbo was since then rebuilt and my old rb20 actuator used.

I am using a stainless steel Bos-Importing split front/dump pipe (batmbl)

Thanks

haha nice drawing.

The HKS2530 was purchased 2nd hand without a hks actuator. The turbo was since then rebuilt and my old rb20 actuator used.

I am using a stainless steel Bos-Importing split front/dump pipe (batmbl)

Thanks

In that case, ignore my n00bness ;)

But in saying that, i find the best way to figure shit out is buy going backwards if you know what i mean. You add something and get a problem, try eliminate it easily, failing, then maybe try replacing some stock parts you know?

dont know anything about those dumps are they quality or chinese crap?

They very good quality dumps, SAU has had several groupbuy threads and they cost around $400 mark

http://www.skylinesaustralia.com/forums/Ba...l&hl=batmbl

Does anyone have a split front/dump pipe with an aftermarket turbo? Any problems with spiking with standard actuator. It must be either the dump or the actuator causing it because it would spike to 13psi on my factory turbo..

Cheers for help

I would hardly call 13psi spiking first and foremost...

What other mods do you have on the car...any form of intake or exhaust mods like a cooler or 3" exhaust and it will run more that 10psi...let alone with an aftermarket turbo that flows more...

And fyi even with a bleed valve you can't lower boost...only raise it...and with a bleed valve you will still experience a little of this so called "spiking" even if it was running right as its a manual system and it takes time to react and come to a steady state...

Also...check your wastegate flap AGAIN because although it might be opening it might not be opening fully...you said you're pretty sure...unless you did it yourself...never be sure...the flaps on HKS 25xx turbos have been known to foul on the split dumps...

AND FINALLY...hks turbos are more efficient around 1-1.2 bar anyway...so harden up....

I would hardly call 13psi spiking first and foremost...

What other mods do you have on the car...any form of intake or exhaust mods like a cooler or 3" exhaust and it will run more that 10psi...let alone with an aftermarket turbo that flows more...

And fyi even with a bleed valve you can't lower boost...only raise it...and with a bleed valve you will still experience a little of this so called "spiking" even if it was running right as its a manual system and it takes time to react and come to a steady state...

Also...check your wastegate flap AGAIN because although it might be opening it might not be opening fully...you said you're pretty sure...unless you did it yourself...never be sure...the flaps on HKS 25xx turbos have been known to foul on the split dumps...

AND FINALLY...hks turbos are more efficient around 1-1.2 bar anyway...so harden up....

it was hitting 13psi on the standard rb20 turbo and did not worry about it. As larger exhaust and intercooler would increase it from 10psi

Once the hks2530 went on its hitting 15psi and some cases 16psi on a standard rb20 actuator (with no boost control devices).

Just wanted to clarify if its normal for the standard 10psi actuator to allow up to 16psi..

i think its quiet find for standard actuator

im running 18psi with high flow turbo and standard R33 actuator with a AM performance split dump i noticed when i went to a full AM performance exhaust i picked up about 4-5 psi because the exhaust was more free flowing

i run a EBC now and hit 1.3 bar constantly

Mine does the same but the only difference is i got the gt2535. Learn to live with it lol. I've changed dumps (screamer/ bellmouth) r33 acuator (went to about 10psi but laggy as hell), hose's, taken out boost controller and still. Just smash 20psi into and enjoy it :)

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


  • Similar Content

  • Latest Posts

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...