Sorry for the long post but there is a lot of info and I tried to organize it as best as possible.
Back story, acquaintance went to get a baseline on his current setup before doing future mods. I had a K&N SS-1008/Pure Power 8415 that was not in use. Since he was going this was a convenient chance to see if a free flowing stainless steel micronic screen filter has any affect on HP/TQ. Remember it takes HP/TQ to run a oil pump.
The oil pump on this engine is a 12mm JDM pump with one shim on the oil pressure relief valve. Factory 12mm pump flow and relief valve specs are below:
600rpm = 1.717 gallons per minute @ 14psi
6,000rpm = 15.586 gallons per minute @ 85psi(capped at relief valve pressure)
Relief valve pressure 85psi(IIRC one shim should raise this ~5-8psi)
Keep in mind this engine was spinning to 7,000rpm.
He had what I would guess to be a 20-30 mile drive there, parked for 15 minutes, then put on the dyno for his 3 baseline pulls.
Pulled it off the dyno(backed it up 25") swapped out the 152208AA12A(OEM blue) for the primed K&N/PurePower set it back up on the dyno and did 3 more pulls. Down time for the filter swap was about 20 minutes. So the pulls are about as consistent as any one could make them. The heat soak for the engine should have been virtually identical between the first set of 3 pulls and the second set of 3 pulls.......
Results are not at all what we expected and well, interesting to say the least.
Pertinent mod list in regards to the powertrain:
Driveline Stuff:
We did not look at or know the results prior to telling the dyno operator what runs we wanted on each print out and him handing them to us. Logically we chose to follow the obvious:
- Put the 1st set of 3 runs(OEM filter) on one graph
- Put the 2nd set of 3 runs(K&N filter) on one graph
- Put the last run of each set on one graph as the comparison.
The logic in using the last run of each set is that each one had 2 previous runs before it in quick succession thus every thing should be equally heat soaked.
As I am not one to pull any punches the graphs below are posted in the above order and there is nothing to hide. Links to full res/size images are below embedded pics.
1st set of 3 runs(OEM filter)
http://img59.imageshack.us/img59/4716/dynoruns13stockfilter65.jpg
RUN 1 HP 285 TQ 281
RUN 2 HP 263 TQ 258
RUN 3 HP 260 TQ 251
2nd set of 3 runs(K&N filter)
http://img266.imageshack.us/img266/2634/dynoruns46knfilter65201.jpg
RUN 1 HP 281 TQ 274
RUN 2 HP 283 TQ 276
RUN 3 HP 278 TQ 266
last run of each set on one graph as the comparison
http://img266.imageshack.us/img266/2634/dynoruns46knfilter65201.jpg
1st set, RUN 3 OEM Honeywell/Subaru 152208AA12A Filter HP 260 TQ 251
2nd set, RUN 3 K&N SS-1008 (AKA Pure Power 8415) Filter HP 278 TQ 266
The 1st set of 3 baseline runs lose 25HP and 30Ft-Lbs from the first run to the third run. One would normally attribute this to intercooler heat soak.
The 2nd set of 3 K&N filter runs lose 3HP and 8FT-Lbs from first run to third run. What happened to the intercooler heat soak theory we had?
The difference from the last run with the OEM *12A filter(HP 260 TQ 251) to the last run with the K&N SS-1008 filter( HP 278 TQ 266) is 18HP and 15Ft-Lbs.
1st set, RUN 1 OEM Honeywell/Subaru 152208AA12A Filter HP 285 TQ 281
2nd set, RUN 1 K&N SS-1008 (AKA Pure Power 8415) Filter HP 281 TQ 274
There were no other changes between the two sets of pulls other then the oil filter being changed. Both runs had 3 blowers pointing at the radiator and one directly strapped to the intercooler in the same spot for each set.
I am not going to jump to conclusions on this one. The only one I have is that some thing happened. Just not sure what.
My only wish is that we would have gotten oil temps also.
So what do you make of the results?
Back story, acquaintance went to get a baseline on his current setup before doing future mods. I had a K&N SS-1008/Pure Power 8415 that was not in use. Since he was going this was a convenient chance to see if a free flowing stainless steel micronic screen filter has any affect on HP/TQ. Remember it takes HP/TQ to run a oil pump.
The oil pump on this engine is a 12mm JDM pump with one shim on the oil pressure relief valve. Factory 12mm pump flow and relief valve specs are below:
600rpm = 1.717 gallons per minute @ 14psi
6,000rpm = 15.586 gallons per minute @ 85psi(capped at relief valve pressure)
Relief valve pressure 85psi(IIRC one shim should raise this ~5-8psi)
Keep in mind this engine was spinning to 7,000rpm.
He had what I would guess to be a 20-30 mile drive there, parked for 15 minutes, then put on the dyno for his 3 baseline pulls.
Pulled it off the dyno(backed it up 25") swapped out the 152208AA12A(OEM blue) for the primed K&N/PurePower set it back up on the dyno and did 3 more pulls. Down time for the filter swap was about 20 minutes. So the pulls are about as consistent as any one could make them. The heat soak for the engine should have been virtually identical between the first set of 3 pulls and the second set of 3 pulls.......
Results are not at all what we expected and well, interesting to say the least.
Pertinent mod list in regards to the powertrain:
- Subaru EJ22t
- 9:1 Compression CP pistons
- Eagle rods
- ’96 Impreza crank (Phase 1)
- ACL bearings
- FHI 12MM Oil Pump (1 extra shim)
- 2002 WRX heads
- Port and Polished
- Combustion chamber matched to block (50CC chamber)
- GSC Stage 1 Cams (266I/266E)
- Manley springs and retainers
- Unorthodox Racing underdriven crank pulley
- Agency power parallel fuel rail system
- Deatchwerks 1000CC/min injectors
- Walboro 255LPH fuel pump
- SPT Intake & Filter
- ’04 STi TMIC
- Forced Performance HTA68 Turbo
- Custom unequal length exhaust manifold
- Invidia catless uppipe
- Helix catless downpipe
- SPT catless midpipe
- STi Genome axle back
- OpenECU (Nuke) Tune
- Running BP 93 octane gasoline
- Rotella T 5w40, changed a week prior
Driveline Stuff:
- Exedy Hyper Single flywheel, clutch, pressure plate
- ’04 STI 6 Speed & R180
- 17” Prodrive P7s
- 225/45/17 Hankook V12s
We did not look at or know the results prior to telling the dyno operator what runs we wanted on each print out and him handing them to us. Logically we chose to follow the obvious:
- Put the 1st set of 3 runs(OEM filter) on one graph
- Put the 2nd set of 3 runs(K&N filter) on one graph
- Put the last run of each set on one graph as the comparison.
The logic in using the last run of each set is that each one had 2 previous runs before it in quick succession thus every thing should be equally heat soaked.
As I am not one to pull any punches the graphs below are posted in the above order and there is nothing to hide. Links to full res/size images are below embedded pics.
1st set of 3 runs(OEM filter)
http://img59.imageshack.us/img59/4716/dynoruns13stockfilter65.jpg
RUN 1 HP 285 TQ 281
RUN 2 HP 263 TQ 258
RUN 3 HP 260 TQ 251
2nd set of 3 runs(K&N filter)
http://img266.imageshack.us/img266/2634/dynoruns46knfilter65201.jpg
RUN 1 HP 281 TQ 274
RUN 2 HP 283 TQ 276
RUN 3 HP 278 TQ 266
last run of each set on one graph as the comparison
http://img266.imageshack.us/img266/2634/dynoruns46knfilter65201.jpg
1st set, RUN 3 OEM Honeywell/Subaru 152208AA12A Filter HP 260 TQ 251
2nd set, RUN 3 K&N SS-1008 (AKA Pure Power 8415) Filter HP 278 TQ 266
The 1st set of 3 baseline runs lose 25HP and 30Ft-Lbs from the first run to the third run. One would normally attribute this to intercooler heat soak.
The 2nd set of 3 K&N filter runs lose 3HP and 8FT-Lbs from first run to third run. What happened to the intercooler heat soak theory we had?
The difference from the last run with the OEM *12A filter(HP 260 TQ 251) to the last run with the K&N SS-1008 filter( HP 278 TQ 266) is 18HP and 15Ft-Lbs.
1st set, RUN 1 OEM Honeywell/Subaru 152208AA12A Filter HP 285 TQ 281
2nd set, RUN 1 K&N SS-1008 (AKA Pure Power 8415) Filter HP 281 TQ 274
There were no other changes between the two sets of pulls other then the oil filter being changed. Both runs had 3 blowers pointing at the radiator and one directly strapped to the intercooler in the same spot for each set.
I am not going to jump to conclusions on this one. The only one I have is that some thing happened. Just not sure what.
My only wish is that we would have gotten oil temps also.
So what do you make of the results?
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