external wastegate and spooling
#1
Junior Member
Thread Starter
Join Date: Mar 2010
Location: Glasgow, Scotland, U.K.
Posts: 115
Total Cats: -12
external wastegate and spooling
planning on using a Tial ext wastegate and running 15psi max boost.
is it just a case of using a 15psi spring in the wastegate?
i read on here that keeping the wastegate closed for as long as possible helps to spool the turbo quicker.or is the idea to use a lesser poundage of spring say 10 psi then use a manual bost controller to up the boost?
is it just a case of using a 15psi spring in the wastegate?
i read on here that keeping the wastegate closed for as long as possible helps to spool the turbo quicker.or is the idea to use a lesser poundage of spring say 10 psi then use a manual bost controller to up the boost?
#6
Tour de Franzia
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
I've tried hooking up a boost controller in-line (like on the single port gates) and it made crazy, erratic MAP pressures and overboosted. The boost controller will choke-down the air filling the canister and things "aren't right". I then hooked it up how TiAL suggests and it worked perfectly at 16psi. However it was way too fast and now I run the spring and it builds boost just as fast as with no line hooked-up.
#13
Junior Member
Thread Starter
Join Date: Mar 2010
Location: Glasgow, Scotland, U.K.
Posts: 115
Total Cats: -12
ok from what ive read so far in this thread.a mbc makes a big difference in midrange, makes boost come in quicker and more abruptly. so sounding good so far!!
so if i need 15 psi to get 300bhp i should use a lesser poundage of spring anything below 15psi so say a 10 or a 12 psi spring in the Tial then fit the mbc and dial in the boost to 15psi?
otherwise theres no point fitting an mbc if its going to stay closed as i wont get the benefit if iam already using a 15psi spring in the Tial wastegate?
so if i need 15 psi to get 300bhp i should use a lesser poundage of spring anything below 15psi so say a 10 or a 12 psi spring in the Tial then fit the mbc and dial in the boost to 15psi?
otherwise theres no point fitting an mbc if its going to stay closed as i wont get the benefit if iam already using a 15psi spring in the Tial wastegate?
#14
Tour de Franzia
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
ok from what ive read so far in this thread.a mbc makes a big difference in midrange, makes boost come in quicker and more abruptly. so sounding good so far!!
so if i need 15 psi to get 300bhp i should use a lesser poundage of spring anything below 15psi so say a 10 or a 12 psi spring in the Tial then fit the mbc and dial in the boost to 15psi?
otherwise theres no point fitting an mbc if its going to stay closed as i wont get the benefit if iam already using a 15psi spring in the Tial wastegate?
so if i need 15 psi to get 300bhp i should use a lesser poundage of spring anything below 15psi so say a 10 or a 12 psi spring in the Tial then fit the mbc and dial in the boost to 15psi?
otherwise theres no point fitting an mbc if its going to stay closed as i wont get the benefit if iam already using a 15psi spring in the Tial wastegate?
It will not lower target MAP RPM though because its a TiAL product that works perfectly if you install it as suggested.
#16
ok from what ive read so far in this thread.a mbc makes a big difference in midrange, makes boost come in quicker and more abruptly. so sounding good so far!!
so if i need 15 psi to get 300bhp i should use a lesser poundage of spring anything below 15psi so say a 10 or a 12 psi spring in the Tial then fit the mbc and dial in the boost to 15psi?
otherwise theres no point fitting an mbc if its going to stay closed as i wont get the benefit if iam already using a 15psi spring in the Tial wastegate?
so if i need 15 psi to get 300bhp i should use a lesser poundage of spring anything below 15psi so say a 10 or a 12 psi spring in the Tial then fit the mbc and dial in the boost to 15psi?
otherwise theres no point fitting an mbc if its going to stay closed as i wont get the benefit if iam already using a 15psi spring in the Tial wastegate?
#17
Elite Member
iTrader: (8)
Join Date: Dec 2008
Location: Kingston, Ontario
Posts: 2,910
Total Cats: 51
yeah there was no way for me to have mine hooked up like hustler shown and get 1-2 psi of control... it would just overboost because there is so little duty cycle change to hit more boost.
#18
Junior Member
Thread Starter
Join Date: Mar 2010
Location: Glasgow, Scotland, U.K.
Posts: 115
Total Cats: -12
thanks for your post.ok you fitted a 16psi spring and boost came on at 5300rpm.
so when you fitted the hallman boost controller was it in closed position or do you have to open it until it just goes above 16psi.
what i was wondering is having a 16psi spring and your aiming to run 16psi anyway then by having a manual boost controller which isnt increasing boost doesnt sound like its going to make any difference?can you explain.Basically i cant see how a mbc can make any difference when it isnt increasing boost from the set boost controlled by the wastegate.
so when you fitted the hallman boost controller was it in closed position or do you have to open it until it just goes above 16psi.
what i was wondering is having a 16psi spring and your aiming to run 16psi anyway then by having a manual boost controller which isnt increasing boost doesnt sound like its going to make any difference?can you explain.Basically i cant see how a mbc can make any difference when it isnt increasing boost from the set boost controlled by the wastegate.
#19
Read up on how wga's and mbc's work.
a wga will start slowly opening when car starts building boost. Meaning even though you will reach desired boost levels, the flapper is already open a tiny bit well before that point. meaning you will build boost smoother/lazier/slower.
An mbc is like an on/off switch. before preset pressure it forces the wga flapper completely shut, helping direct ALL instead of MOST gasses thruogh the turbine wheel. It only opens WHEN it reaches preset level, and not even a little bit before that.
that helps for boost to (sometimes) come in quicker and (always) come in harder/more suddenly.
a wga will start slowly opening when car starts building boost. Meaning even though you will reach desired boost levels, the flapper is already open a tiny bit well before that point. meaning you will build boost smoother/lazier/slower.
An mbc is like an on/off switch. before preset pressure it forces the wga flapper completely shut, helping direct ALL instead of MOST gasses thruogh the turbine wheel. It only opens WHEN it reaches preset level, and not even a little bit before that.
that helps for boost to (sometimes) come in quicker and (always) come in harder/more suddenly.