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11-23-2009, 02:37 PM | #1 |
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RMIC
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Vehicle:2005 modded S4 |
2.0l - Vf39- 15 Psi - 279 Whp
so i am really impressed.... at only 15 PSI we acheived 279 WHP... we turned the boost up to 17 and my tuner said he didnt feel "safe" with it.
Car : 04 wrx Turbo : VF-39 Injectors : 650cc Intercooler : STI TMIC Exhaust : Fully catless 3" Blitz Intake : AEM Fuel Pump : Walbro 255 Spark plugs : 1 step colder Location : The Boost Creep LTD, Longmont CO Temp : roughly 60 degrees Elevation : 4900 feet Dyno : Dyno dynamics boost : 15 PSI Max hp : 279.1 dyno sheet 15 PSI sheet
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Last edited by lowrider89; 11-23-2009 at 03:03 PM. |
11-23-2009, 04:00 PM | #2 |
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Looking at the graph, you could prob stand for a bit more aggressive timing at boost onset...slow spool and no real tq spike.
So why only 15psi? Good numbers for 15psi sure, but why only run 15? |
11-23-2009, 04:02 PM | #3 |
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15psi @ almost a mile altitude? doesn't seem like much boost...
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11-23-2009, 04:08 PM | #4 |
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hmmm yeah my question too...sounds like really advanced timing.
i make about 15 wheel more but a whole 6 psi more. |
11-23-2009, 04:57 PM | #5 | |
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Quote:
we tried rasing my boost on (4) different runs... the tuner did not like the way it ran and tuned me at 15 PSI... i was really hoping for ATLEAST 17 psi,oh well 279 WHP is much more fun that my old 230 WHP - also we both dynotuned my car and road tuned my car... i am not happy with the 15 PSI, but i am happy with 279 WHP... so i guess in the end i am happy... Last edited by lowrider89; 11-23-2009 at 05:06 PM. |
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11-23-2009, 06:59 PM | #6 |
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im running 21psi on my vf39 on pump gas. Properly tuned on more boost, you wouldnt make thattt much more hp but you would pick a ton of wtq. Barely touching 245wtq is weak sauce man. Find a different tuner, or if your car has issues fix them. Peak tq at 4300 is also crap. Unless that is just a funkylicous dyno, you are leaving ALOT of power band on the table.
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11-23-2009, 09:09 PM | #7 | |
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Quote:
car does not have any issues.... put a new OEM motor in it 10,000 miles ago...and the parts i bought were all quality and good.... and i know 245 WTQ is really low but another customer with a VF-39 last week only put down 255ish WTQ with a 2.5L on that dyno .... - atleast my 5 speed can handle it Last edited by lowrider89; 11-23-2009 at 09:20 PM. |
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11-23-2009, 09:13 PM | #8 | |
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I wouldnt be discouraged, thats a nice graph you have there man. |
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11-24-2009, 08:29 AM | #9 |
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make sure your motor can handle it! just put good gas (or a bit of special sauce) in it, wouldn't want to catch a bad tank with all that timing advance.
does your tuner have a baseline graph and mod list for that 2.5 you mentioned? |
11-24-2009, 09:53 AM | #10 |
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- How can you tell what my timing is from those two graphs? I was watching my timing on his laptop while we did road pulls... my timing was not very advanced
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11-24-2009, 11:03 AM | #11 |
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What was your timing?
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11-24-2009, 11:17 AM | #12 | |
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a timing and a/f map would clear things up in a big way. |
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11-24-2009, 11:22 AM | #13 | |
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11-24-2009, 11:24 AM | #14 |
Scooby Specialist
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11-24-2009, 11:42 AM | #15 | |
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just my 2c... which is worth at least 2 cents less than face value |
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11-24-2009, 12:14 PM | #16 | |||
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Quote:
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As for the 15 psi........everyone needs to realize that is probably around 19-20psi at sea level. The lower atmospheric pressure is a double whammy on the turbo.....it needs to run ~2-4 psi higher MAP to = its sea level equivalent and the turbo is also having to work at a higher pressure ratio and lower efficiency island on the compressor map. 15 psi at 5000 ft /=/ 15 psi at sea level |
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11-24-2009, 02:10 PM | #17 | |
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11-24-2009, 02:17 PM | #18 | |
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11-24-2009, 02:31 PM | #19 | |
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Heres the equations for an 06 STi Atmoshperic Boost Compensation -> calculated as follows: multiplier = (logged atmospheric pressure * .05208) + 0.25 multiplier is limited to between 0 and 1. target boost absolute = target boost map value + 14.7 target boost psi relative sea level with atmospheric comp = (target boost absolute * multiplier) - 14.7 Multiplier = (12.3*0.05208)+0.25 = 0.8905 Target Boost ABS = 19psi + 14.7 = 33.7 <---- i figured out the 19 in excel. basically what boost target is needed in the map to achieve a final boost target of 15 psi Target Boost PSI relative sea level = (19 * 0.8905) - 14.7 = 15.3 psi Basically however much your ATM Pressure is lower than 14.7 your final boost target will be 2x that lower. IE 13.7 atm pressure will yield boost targets that are 2 psi lower than map vales 12.7 ----> 4 psi 11.7 ----> 6 psi Its not simply "you're 1 psi low so you're reduced 1 psi".......its double to offset the compressors lower efficiency. Last edited by Phatron; 04-06-2010 at 02:03 PM. |
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