J Chen

Hi,
In the thread Tial wastegate install, Myswiss mentioned
that Reliabbost reach full boost much later than using
an EBC. Has any one else have this experience ?
Would a MBC provide faster spool up over Reliaboost ?
In theory the Reliaboost should provide quick spool since
no signal will be send to the wastegate until the set pressure
is reached. The only thing that I feel an EBC is superior to
the other mechanical device is the ability to provide a consistent
boost setting in any gear.
O.K guys please share your knowledge & experience,
Thanks

toddk911

In regards to boost coming on quicker, I have heard from others in here that it does with EBC. But in regards to holding constant boost, my reliaboost holds 15 just fine in all gears to redline. Of course, spool up and boost holding is dependant on your wastgate.

For coming on quicker, I put a stiffer spring in the reliaboost and it comes on hard and steady. I also have a rebuilt wastegate with a stiffer spring.

porshhhh951

i ran lindsey's unit for a few months until i went with my hold new setup .....including a cabin adjustable mbc.......i have it set to 18 psi....and i build boost fine i see about 16-17 psi in first and i see 18 psi by 4k in 2nd

J Chen

Hi Guys,
Thanks for the reply. The question here is how much quicker is the EBC
over other mechanical controllers with regards to boost build up.
I recall a review I read elsewhere that the difference is slight.
Toddk911, buy changing to a stiffer spring, how much quicker does
boost build up. What about boost pressure setting ? Would not the use
of a stiffer spring be detrimental to setting of the correct boost ?
Funny, on my car the first 3 gears are o.k 15psi but in forth gear I
see 17 psi. What do you think is the problem ? I'm using a 38mm
Tial wastegate .
Thanks

evil 944t

I didn't really notice much from a Mbc to an EBC.. An ebc just smoothed out the boost spike..

FityOne

I used the Reliaboost with stronger spring upgrade (Guru Racing) and presto, my boost hits hard and fast and holds 15psi steady, also have no spikeing whatso ever. The reliaboost has spike protection built in. My friend has a electronic controller and I sure as hell cannot tell a difference, except that his looks cooler,....but he paid a hell of a lot more than I did. In my opinion, the performace difference if any is very small, but the cost issue is large. I guess it depends on how much you want to spend. Though I would trust the reliaboost because it is mechanical, whereas electronic controllers have been known to go on the fritz from time to time.

Just my few cents.

MySwiss

J Chen. The way you have your reliaboost dosen't allow you to use your Tial to it's full potential,as a dual port wastegate should.

Your top port is meant to be connected to the outlet of your mbc or ebc (like Tial specifies), the other side of your mbc or ebc should be connected to the same signal line that goes from the banjo bolt (at your intercooler) to to the Tial side port.

When your boost controller is connected in such a way,it will be able to either control the opening or closing of your wastegate, depending on how much air will get by your mbc or ebc to the top port on your Tial,which in turn will open your wastegate at the desired level.

Now I've read the Reliaboost instructions,and it seems that your installation is correct. Are you still using the cycling valve, or you by passed it??

J Chen

Hi Myswiss,
Yes I've already bypass the cycling valve. So, are you saying
that If I utilise the top port as well it will allow even faster
spool up ?

MySwiss

Well,I think that after looking at the reliaboost instructions, it was not meant to be installed like Tial specifies in their instructions. But it might be worth a try, with precautions.

OZ951

I wouldn't be in any great rush to go with EBC over MBC. I dont see any significantly faster onset of boost with the EBC. True, I dont get a boost spike with the EBC but my MBC only used to spike 1 PSI over (no big deal). The EBC has some nice features but I wouldnt call them important for 95% of cars. Your far better of (value wise) to buy a MBC and a decent wastegate.

sm

MySwiss et.al.,

Could you please educate me on how the wastegate works by having two pressure lines running to it? Thanks!

J Chen

Hi OZ951,
Yes I've installed a 38mm Tial. Prior to the use of Reliaboost,
I actually had a Delta MBC. Since the Reliaboost is a pressure
sensing device, I expected it to boost much faster than the
MBC which it does. What I can't figure out is that Myswiss
says states that after installing an EBC, he gets full boost
much earlier when compared to his previous set up.
Since the Reliaboost will block all boost signal until the set
pressure, In theory, I would think that spool up should be as
fast as EBC.

RPG951S

Guys,

Your missing the key factor; MySwiss is taking about a DUAL-port wastegate.
It can function a little differently compared to a single port.

The optimum setup is to use an EBC, which can cycle the reference port signal (side port) from boost to vacumn, inversely with signal coming from the boost side (top port)

Compared to a single-port, which only has a spring as the only thing open/closing the wastegate valve; the dual port uses the spring + postive/negative pressure to slam the wastegate valve open and closed. Hence faster response.
You can't really use a dual-port wastegate effectively without an EBC; without one it's essentially a single port wastegate.

The reason MySwiss is seeing better boost 'response' and earlier buildup is likely due to the fact the spring alone in the Tial isn't 'strong' enough to keep the wastegate from opening slightly when pressurized. But take the spring + positive pressure and the valve stays firmly shut.

Hope that clears things up...

J Chen

RPD951s,
Thanks for clearing it up. Since this is the case, do you think
it's possible to hook up the Reliaboost this way where the
top port is tied together with the banjo bolt at the exit prior
to connecting to Reliaboost ?
Thanks

Sach951

How significant is the difference? As in how much faster / earlier does boost hit than stock with mbc w/ wastegate, ebc / dual port, and so forth...

Thanks,
Sach