Electronic boost controllers

[ROYALS STI]

Hey guys I have a v7 sti with a 3inch exhaust from the turbo back,I had a issue with turbo spiking ( hitting 1.3 to 1.4 bar ) and put a boost tee on to bring it back to 1.2 for now. I'm getting the ecu reflashed soon and was thinking of getting a ebc to sort out the spiking and bring on the boost quicker and be more stable.What are your thoughts ??should i get another factory solanoid or a aftermarket electronic boost controller or keep the turbosmart boost tee and tune it with that, any thoughts would be great.??

[WRXONP]

an electronic boost controller or an external wastegate should solve the boost spike issue u have

[lunchie]

Its interesting you should mention this as if you go onto STM's website they strongly suggest an aftermarket boost controler be fitted along with any ECU remap or aftermarket parts. They dont however suggest this for the evo equivilent mods which seems to suggest that the subies have some boost fluctuation when you start to mod them.

[WRXONP]

a subaru is allways going to get some sort of boost spike issue when u change the exhaust and downpipe to a high flowing item...as the boost solinoid is setup to run with the standard not so good flowing downpipe (boost comes on slower...easier to controll) where as u fit the downpipe the boost is going to come on alot more rapid and the controller wont keep up with it....

like i said best thing to do is either an external wastegate and or a electronic boost controller

[ROYALS STI]

the car was spiking before the exhaust sorry, I've just set the tee so it hits 1.2 bar in 5th or 6th gear but feels like it had more pull before with standard solanoid but was hitting higher boost due to spiking.

[WRXONP]

if its spiking even with factory exhaust then somethings wrong lol...but still like i keep saying the easiest ways to fix boost spike is a electronic boost controller and u can set gain etc to help with spike and or a external wastegate

[Pappu1]

It's the dam 2 port bleed solenoid which tuners don't like as it's a pain to get boost right with them on the v7 ecu

Took me atleast a dozen runs to get a proper boost curve on the factory solenoid

Tbh an aftermarket one is way easier to setup

Electronic ones that have a proper solenoid are way better at buldin and keeping boost

For Ppl on a low as budget a t does 99 percent of the job as far as boost control for a fraction of the cost

A good quality t usually has little issues likethe cheap ones

Kinda depends how deep u pockets are in many instances

[Guest]

1.4 isnt as bad as my one which is 1.5 to 1.6 this only happens on 5th and 6th, somehow it think its on load or something... yeah getting my one reflash soon probably at speedtech... dont know yet depending on where i am at the time?

[Stoffa]

changing the size of the boost pill is a much cheaper way of controlling spike, you definatly shouldn't need an external wastegate on a factory turbo.

[Pappu1]

 Stoffa said:

changing the size of the boost pill is a much cheaper way of controlling spike, you definatly shouldn't need an external wastegate on a factory turbo.

On a stock setup if pill size is larger it will not spike but then it will start underboosting from the target figure

edit:

smaller pill will spike

larger pill will underboost/lag

In a fully stock setup spiking maybe solenoid issue if nothing else is changed at all

Or leaks in stock hoses or loose hoses type situation

Can't think of many other reasons why Wud spike on stock setup

[WRXONP]

wouldnt a smaller pill make it spike more??? wouldnt the smaller pill make it take longer for the gate to open ie more spike?? maybe wrong though

[Pappu1]

 WRXONP said:

wouldnt a smaller pill make it spike more??? wouldnt the smaller pill make it take longer for the gate to open ie more spike?? maybe wrong though

lol just noticed what i wrote

no no ur right

a smaller pill will spike and larger pill will underboost

lol thats what happes when u type and not pay attention and think something else (daydreamer syndrome :-[)

thanks for pointing out bro

lol

have edited the post to read corectly

[WRXONP]

hahaha allgood...cos when i was having spike on my external wastegate it was from a 1mm restrictor on such a hard wastegate spring...