EBC - Can you alter boost levels at different RPM's?

[Robo's]

With a Electronic Boost control can you alter boost pressure at different rpms. Im getting 17psi at 4500rpm and then it drops off too 12psi and peak revs. This is using a HKS actuator and no bleed valve so its not the actuator spring. So i thought with a EBC could i dial in more boost pressure at say 6000rpm.

Can i do this?

[fresh]

my guess is the stock turbo mate, don't tihnk its capable of pushing 17psi at 6000 rpm, might be time for a hi-flo

[Cubes]

Some EBC's are not intelligent.

Some operate in a closed loop mode that monitors boost and adjusts the duty cycle to suit. The cheaper EBC's tend to have a fixed duty cycle which is why you get boost dropping at higher rpm's.

I used to own a Blitz SBC-ID EBC that had a manual function and auto function.

The manual function was like the regular ebc where you set it to a duty cycle.. Say 43. then you set the gain which controls how fast boost reaches that duty cycle peak if that makes sense. It would make 15psi then tapper off to 12.5psi by 7000rpm.

Then there was the auto function that would require you to dial in the boost you want (say 15psi) it would then slowly learn the boost curve and adjust the duty cycle to suit. This would require multiple 7000rpm runs.

Once learnt it knows that it has to reduce the duty cycle in order to hold that 15psi a certian RPM. It would then hold 15psi to redline.

Wait until you get the PowerFC & get the boost controller to suit that.

The PowerFC boost controller is essentially the same as the AVCR which is a very good boost controller. Some do not like the AVCR due to its complexity and thoughts that a bigger solanoid is better. Which is untrue.

EDIT: Stock turbo or not.. It has nothing to do with it. A good EBC will hold boost. i.e the rb20t turbo was able to push 16psi at 7000rpm on the rb20det when with a crappy bleeder it would tapper off to 12.5psi. You need an intelligent EBC. AVCR, Blitz SBC-id or the Greedy E0-1 (Expensive) I think it is.

[Robo's]

my guess is the stock turbo mate, don't tihnk its capable of pushing 17psi at 6000 rpm, might be time for a hi-flo

Its a HKS 2530

[AzzurrA]

How good of a boost controller do you consider something like a GReddy Profec B-Spec II, or even a Spec-S?

Some EBC's are not intelligent.

 

Some operate in a closed loop mode that monitors boost and adjusts the duty cycle to suit. The cheaper EBC's tend to have a fixed duty cycle which is why you get boost dropping at higher rpm's.

 

 I used to own a Blitz SBC-ID EBC that had a manual function and auto function.

The manual function was like the regular ebc where you set it to a duty cycle.. Say 43. then you set the gain which controls how fast boost reaches that duty cycle peak if that makes sense. It would make 15psi then tapper off to 12.5psi by 7000rpm.

 

Then there was the auto function that would require you to dial in the boost you want (say 15psi) it would then slowly learn the boost curve and adjust the duty cycle to suit. This would require multiple 7000rpm runs.

Once learnt it knows that it has to reduce the duty cycle in order to hold that 15psi a certian RPM. It would then hold 15psi to redline.

 

 Wait until you get the PowerFC & get the boost controller to suit that.

The PowerFC boost controller is essentially the same as the AVCR which is a very good boost controller. Some do not like the AVCR due to its complexity and thoughts that a bigger solanoid is better. Which is untrue.

 

EDIT: Stock turbo or not.. It has nothing to do with it. A good EBC will hold boost. i.e the rb20t turbo was able to push 16psi at 7000rpm on the rb20det when with a crappy bleeder it would tapper off to 12.5psi. You need an intelligent EBC. AVCR, Blitz SBC-id or the Greedy E0-1 (Expensive) I think it is.

[32vspecII]

the avcr will let you program boost at particular rpms and gears

to help with stuff like traction at low gear low rpm launches

as opposed to the fuzzy logic automatic boost curves mentioned with are not realy controlable

[Cubes]

AVCR lets you do everything.

fuzzy logic, rpm & gear based boost. everything.

GReddy Profec B-Spec II, or even a Spec-S...

I don't know I would have to read up if it has a boost curve learning mode.

If you simply dial in a number say 42 or 45 that has no correlation to the boost figure

its self then it is based on a percentage of maximum boost hence duty cycle.

That is when you will run in to trouble as you cannot get the boost controller to increase or reduce the duty cycle when needed to hold a certian boost.

[Turbo Tits]

you will never be able to sustain 17psi throughout the entire on-boost rev range with a 2530 on an rb25. 2 different tuners in here in SA explained from their experience that apparently there is too much exhaust flow from the rb25 at the top end, where the compressor is "spun out of its efficiency" and starts to "chop" the intake air rather than compress it. we were also running 17psi and it always dropped off to 13psi at the top end. in this case, its the turbo, not the EBC that is responsible for the pressure drop. Before we we're told this we had tried 2 different wastegate actuators and 2 reputatable EBC's, all to no avail.

just be happy with the mid-range

[R31Nismoid]

a HKS EVC 3 or 4 will give the best control out of all of em...

but doesnt offer the fancy stuff like Gears vs Boost... guess thats why they are $150 cheaper. No flashy shit. Just controls boost you ask for

[Robo's]

you will never be able to sustain 17psi throughout the entire on-boost rev range with a 2530 on an rb25. 2 different tuners in here in SA explained from their experience that apparently there is too much exhaust flow from the rb25 at the top end, where the compressor is "spun out of its efficiency" and starts to "chop" the intake air rather than compress it. we were also running 17psi and it always dropped off to 13psi at the top end. in this case, its the turbo, not the EBC that is responsible for the pressure drop. Before we we're told this we had tried 2 different wastegate actuators and 2 reputatable EBC's, all to no avail.  

just be happy with the mid-range

But i was thinking i could run 17psi in the midrange and when it starts to drop, somehow try and squeeze more boost into it without trying to boost to more than 17 in the middle.

[brett33]

Mate you can up the boost all you want but with a 2530 all ya gunna do is make hot air. And all that will do is bring you that bit closer to detonation.

[R31Nismoid]

Mate you can up the boost all you want but with a 2530 all ya gunna do is make hot air. And all that will do is bring you that bit closer to detonation.

and you know this because why?

do you know where a 2530's Efficiency range is?

its certainly not at low boost - 10-15psi. HKS turbos are designed to perform better at higher boost... not just "make hot air"

[carl h]

the greddy e-01 has an rpm offset feature which is designed to allow for boost to be held at a steady curve by adding to the total solenoid duty cycle.

[GTR-Ben]

EVC 4 Pro.. although I can not find the english instructions anywhere.. which makes them useless to me.

I have a Power FC and a seperate AVC-R.

[nedb]

How good of a boost controller do you consider something like a GReddy Profec B-Spec II, or even a Spec-S?

Greddy Profec Spec S is like the old Profec B just with an upgraded solenoid.

Profec B Spec II is a bit of a pain to set up.

Check the link bellow, its bit old but good info.

http://www.sportcompactcarweb.com/tech/020...boostcontrol05/

[Turbo Tits]

Mate you can up the boost all you want but with a 2530 all ya gunna do is make hot air. And all that will do is bring you that bit closer to detonation.

no offense, but i dont think youve had much, if any, experience with 2530's on rb25's, because if you had, youd know that you cant "up the boost all you want".

not trying to shit stir here, but im coming from direct experience in collaboration with 2 reputable SA tuners.

[Turbo Tits]

Mate you can up the boost all you want but with a 2530 all ya gunna do is make hot air. And all that will do is bring you that bit closer to detonation.

no offense, but i dont think you've had much, if any, experience with 2530's on rb25's, because if you had, youd know that you cant "up the boost all you want". if you have had experience with this setup, i really want to know how you did it, because it was a real pain in the arse

i think if it was capable of sustaining 17psi at the top end, after all the tuning and trying different things, we would have been able to make it happen.

now on a rb20, its a different story, smaller engine, less exhaust gasses. my good friend with a 2530 on his r32, making 240rwkw, can sustain up to and over 17psi across the top end.

not trying to shit stir here, but im coming from direct experience in collaboration with 2 SA tuners.

[Turbo Tits]

But i was thinking i could run 17psi in the midrange and when it starts to drop, somehow try and squeeze more boost into it without trying to boost to more than 17 in the middle.

it seems to be all due to excessive exhaust gasses. i've always thought that if you enlarged the wastegate, you would be able to bypass more exhaust, slowing down the exhaust turbine and hence bring the compressor back into its efficiency. does that sound right?

i know its not all about the exhaust turbine and housing that matters, but, we have a 2835proS on the 25 now and both the exhaust turbine and its housing is considerably larger than the 2530, and it sustains 17psi rock steady across the top end, and wants to keep going. its so easy to hit the limiter because there is no letting up in the power delivery. after a rebuild it would be interesting to see if we could find the point, if there is one, where boost drops off at the top end with this turbo. but i dont think id like to push it that hard

[Turbo Tits]

But i was thinking i could run 17psi in the midrange and when it starts to drop, somehow try and squeeze more boost into it without trying to boost to more than 17 in the middle.

it seems to be all due to excessive exhaust gasses. i've always thought that if you enlarged the wastegate, you would be able to bypass more exhaust, slowing down the exhaust turbine and hence bring the compressor back into its efficiency. does that sound right?

[Robo's]

it seems to be all due to excessive exhaust gasses. i've always thought that if you enlarged the wastegate, you would be able to bypass more exhaust, slowing down the exhaust turbine and hence bring the compressor back into its efficiency. does that sound right?

The wastegate on a HKS 2530 is bigger than the stock R33 turbo, i guess its still not big enough.

Does the 2535 have a bigger exhaust wheel than the 2530?