Restrictor pill size in 95 WRX
22 June 2017, 10:24 PM
#1
Restrictor pill size in 95 WRX
Whats the standard pill size for a WRX 1995 ? Is it 2mm ?
Sort of toying with the idea changing the pill in the aim of a bit quicker spool, as its not standard anymore, prodrive 3 port solenoid, later map sensor, running higher boost etc etc, ive read Pre 96 the pill with a smaller hole reduces boost (so id like to go up a size) but can i if its 2mm already ? or just remove it ? and Post 96 the pill with a smaller hole gained boost ??
After fitting my Harvey trick up pipe to the TD05H i dont get any better spool , im hitting 1 bar sometimes around 3200 , depending on when i stamp on the loud pedal , if i stamp it down from 2k i get quite slow spool , usually hitting 1 bar around 3600, if i stamp it down at around 3k i hit 1 bar around 3200 and my target of 1.35 around 3400 onwards
was hoping to start hitting the 1 bar around 3k , am i dreaming or will a smaller pill help ?
Not really messed with pill sizes so feel free to educate me
cheers
Sort of toying with the idea changing the pill in the aim of a bit quicker spool, as its not standard anymore, prodrive 3 port solenoid, later map sensor, running higher boost etc etc, ive read Pre 96 the pill with a smaller hole reduces boost (so id like to go up a size) but can i if its 2mm already ? or just remove it ? and Post 96 the pill with a smaller hole gained boost ??
After fitting my Harvey trick up pipe to the TD05H i dont get any better spool , im hitting 1 bar sometimes around 3200 , depending on when i stamp on the loud pedal , if i stamp it down from 2k i get quite slow spool , usually hitting 1 bar around 3600, if i stamp it down at around 3k i hit 1 bar around 3200 and my target of 1.35 around 3400 onwards
was hoping to start hitting the 1 bar around 3k , am i dreaming or will a smaller pill help ?
Not really messed with pill sizes so feel free to educate me
cheers
Last edited by The Rig; 22 June 2017 at 10:42 PM.
23 June 2017, 02:24 PM
#3
it's all fairly simple and it’s gonna blow your mind - older cars came with a 3port boost solenoid stock, newer cars a 2port solenoid standard.
On a 3port setup, the stock pill is in the vent line, restricting the amount of pressure the solenoid can interrupt out of the system. Bigger pill = less restriction = more pressure bleeding off = higher boost for the same WGDC.
On a 2port setup, the stock pill is before the T piece. The 2port can only bleed off pressure – not interrupt it entirely like a 3port so the pill reduces the amount of pressure getting to the gate and a smaller pill means less pressure heading to the gate so the relative bleed effect from the 2port is increased.
So – if your on a 3port solenoid/interrupt system (where pressure must go through the solenoid then to the gate) a smaller pill gives less boost. If your on a 2port solenoid/bleed system (where pressure is bleed off on the way to the gate) then smaller pill gives more boost.
If your using a 3port solenoid and your mapping the ECU then you can usually do away with the pill entirely and adjust the duty in the ECU to suit.
On a 3port setup, the stock pill is in the vent line, restricting the amount of pressure the solenoid can interrupt out of the system. Bigger pill = less restriction = more pressure bleeding off = higher boost for the same WGDC.
On a 2port setup, the stock pill is before the T piece. The 2port can only bleed off pressure – not interrupt it entirely like a 3port so the pill reduces the amount of pressure getting to the gate and a smaller pill means less pressure heading to the gate so the relative bleed effect from the 2port is increased.
So – if your on a 3port solenoid/interrupt system (where pressure must go through the solenoid then to the gate) a smaller pill gives less boost. If your on a 2port solenoid/bleed system (where pressure is bleed off on the way to the gate) then smaller pill gives more boost.
If your using a 3port solenoid and your mapping the ECU then you can usually do away with the pill entirely and adjust the duty in the ECU to suit.
23 June 2017, 02:32 PM
#5
it's all fairly simple and it’s gonna blow your mind - older cars came with a 3port boost solenoid stock, newer cars a 2port solenoid standard.
On a 3port setup, the stock pill is in the vent line, restricting the amount of pressure the solenoid can interrupt out of the system. Bigger pill = less restriction = more pressure bleeding off = higher boost for the same WGDC.
On a 2port setup, the stock pill is before the T piece. The 2port can only bleed off pressure – not interrupt it entirely like a 3port so the pill reduces the amount of pressure getting to the gate and a smaller pill means less pressure heading to the gate so the relative bleed effect from the 2port is increased.
So – if your on a 3port solenoid/interrupt system (where pressure must go through the solenoid then to the gate) a smaller pill gives less boost. If your on a 2port solenoid/bleed system (where pressure is bleed off on the way to the gate) then smaller pill gives more boost.
If your using a 3port solenoid and your mapping the ECU then you can usually do away with the pill entirely and adjust the duty in the ECU to suit.
On a 3port setup, the stock pill is in the vent line, restricting the amount of pressure the solenoid can interrupt out of the system. Bigger pill = less restriction = more pressure bleeding off = higher boost for the same WGDC.
On a 2port setup, the stock pill is before the T piece. The 2port can only bleed off pressure – not interrupt it entirely like a 3port so the pill reduces the amount of pressure getting to the gate and a smaller pill means less pressure heading to the gate so the relative bleed effect from the 2port is increased.
So – if your on a 3port solenoid/interrupt system (where pressure must go through the solenoid then to the gate) a smaller pill gives less boost. If your on a 2port solenoid/bleed system (where pressure is bleed off on the way to the gate) then smaller pill gives more boost.
If your using a 3port solenoid and your mapping the ECU then you can usually do away with the pill entirely and adjust the duty in the ECU to suit.
Explained nicely for my simple brain.Ive removed the pill for now, not had chance to test but will do and see what the results are, as im running 100 % Duty cycles upto 3300 then dropping to 92 at full load last cell will see if it helps by removing this pill to gain some quicker spool
24 June 2017, 11:35 AM
#6
Well I can confirm removing the pill on a pre 96 increases boost . It gives you all of it lol . So don't remove the pill !!
It didn't improve spool so without the pill in place I'd of had to reduce WGDC down by like 30% to achieve my 1.35 targets and without the gain I'd wanted ( quicker spool ) didn't seem worth the hassle
Was worth a test ha
It didn't improve spool so without the pill in place I'd of had to reduce WGDC down by like 30% to achieve my 1.35 targets and without the gain I'd wanted ( quicker spool ) didn't seem worth the hassle
Was worth a test ha
Last edited by The Rig; 24 June 2017 at 11:41 AM.
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24 June 2017, 01:59 PM
#8
Yeah, i can see why you would need to lower dutys a fair bit going from a 2 port to 3 port, but my car has always been a 3 port setup from standard , i was just testing if with no pill it would bring spool on a bit better, if it did i would of then altered my duty cycles to suit the more boost etc, yet spool still wasnt any better, it spools early on obviously lol , but im not hitting 1 bar until around 3200 /3400 still . Think thats the limitations of it all, ive tried most things apart from headers i guess.
cheers
cheers
You do seem to have tried most things to get that spool time down,I still recon you could get it to under 3k @1 bar.....don't let it beat you 