I've heard a hundred different things floating around about which spring to choose. I had emailed Tial a few months back with no luck. Well, I didn't notice this until after I had called them today (I felt dumb) but they have posted a spring selection guide on their website. Here it is.

Edit: <U>THIS APPLIES ONLY TO A TIAL BLOW OFF VALVE!!! THIS HAS NOTHING TO DO WITH A TIAL WASTEGATE!!!</U>

Measure engine vacuum at idle. ( engine at operating temperature )

Vacuum Reading
Between ----------------------------------------- Use Spring
-22 in/hg and -23 in/hg -------------------------12 psi (-24 in/hg)
-18 in/hg and -21 in/hg -------------------------11 psi (-22 in/hg)
-14 in/hg and -17 in/hg -------------------------9 psi (-18 in/hg)
-10 in/hg and -13 in/hg -------------------------7 psi (-14 in/hg

As my engine is in pieces right now as the turbo kit is being installed, what is your vacuum read at idle in a B18C1? Just need a nice average.


Modified by ThePro at 8:39 AM 6/30/2005

 

most honda's i've ever seen idle when freshly built around 20-22in. when you are in gear and let off the gas, they will go to 24-25in but normally between 20-22in. I have the 11psi spring on my tial gate and my car still idles around 22in.

 

what spring do the tial bovs come with stock?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by igo4bmx &raquo;</TD></TR><TR><TD CLASS="quote">what spring do the tial bovs come with stock?</TD></TR></TABLE>

11psi

 

Man talk about good timing. I was wondering about this today...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by igo4bmx &raquo;</TD></TR><TR><TD CLASS="quote">what spring do the tial bovs come with stock?</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ben@importparts.com &raquo;</TD></TR><TR><TD CLASS="quote">

11psi</TD></TR></TABLE>

Does that mean that you would need to boost 11 psi in order for it to function properly?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Makdaddynuge &raquo;</TD></TR><TR><TD CLASS="quote">Does that mean that you would need to boost 11 psi in order for it to function properly?</TD></TR></TABLE>

No, take a look at the table in the original post to figure out what spring you need to buy.

 

when i had an 11 pound spring on my tial bov...it gave me compressor surge on light throttle/low boost. then i changed to the 7 pound spring and it works like a charm throughout.

 

oh and this was on a gsr motor.

 

ok when i order a tial w/g...do i have to pay extra in order to get that 7psi spring? Or is it part of the ordering process choosing which one you want?

 

No, this has nothing to do with a Tial Wastegate. This only applies to a Tial Blow Off Valve.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ineedhelp &raquo;</TD></TR><TR><TD CLASS="quote">when i had an 11 pound spring on my tial bov...it gave me compressor surge on light throttle/low boost. then i changed to the 7 pound spring and it works like a charm throughout.</TD></TR></TABLE>

Sorry for that stupid question but how do you determined that you have compressor surge? and whats about BOVs that don't have an changable spring?!?

hope to get some answers ;-)

Thanks
Malte

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ThePro &raquo;</TD></TR><TR><TD CLASS="quote">No, this has nothing to do with a Tial Wastegate. This only applies to a Tial Blow Off Valve.</TD></TR></TABLE>

Sorry dude, i meant "BOV" not w/g. Same question just put BOV in its place.

 

On a gsr motor, you want the 11psi spring.

If you are getting surge with the 11psi spring, you need a *stronger* vacuum source to open the BOV. Give it its own dedicated line right off the intake manifold. Tial BOV requires lots of vacuum. Geoff@Fullrace recommended this to me, and he was 100% correct.

I tried swapping to the 9psi spring, and yes all "surge" was gone, but it took forever to build boost back between shifts. I hated the way my car felt.

BTW I pull -600mm/HG at idle on stock GSR, which is ~-23.6in/HG.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrx &raquo;</TD></TR><TR><TD CLASS="quote">

Sorry for that stupid question but how do you determined that you have compressor surge? and whats about BOVs that don't have an changable spring?!?

hope to get some answers ;-)

Thanks
Malte</TD></TR></TABLE>

Cha-Chaa-Chaaaa-Chaaa-Chooooooooo when you let off the throttle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Makdaddynuge &raquo;</TD></TR><TR><TD CLASS="quote">ok when i order a tial w/g...do i have to pay extra in order to get that 7psi spring? Or is it part of the ordering process choosing which one you want?</TD></TR></TABLE>

It doesn't cost anything extra. It's an option you can request.