My Phase III Project - 09 WRX HB - Page 3 - Subaru WRX Forum
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post #31 of 90 Old 02-16-2010, 11:49 PM Thread Starter
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RcrsWetDream,

The Dyno is run on Dynapack, which is known to produce a lower number compared to DynoJet.
I found this comparison...


I am really concern because the header is supposed to shift the power curve to the left with minimal gain on top hp / tq. The intake might make 10 hp more. With a little higher boost.... hopefully I'll hit 300 whp.
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post #32 of 90 Old 02-17-2010, 12:28 AM
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with a better tune, header, intake, you can do 20psi, 21 if the turbo makes power, CAI, you can deffenently make 48 more hp over stock.

if that 15psi is correct.
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post #33 of 90 Old 02-17-2010, 12:39 AM Thread Starter
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I remember reading a rule of thumb somewhere. It goes like for every psi increment, you can gain about 8 hp or something like that. Does anyone remember what that was?
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post #34 of 90 Old 02-17-2010, 01:40 AM
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That is completely dependent on the application. A small turbo on a small motor won't make much hp for a given pressure. A large turbo on a large motor will make huge power at very low boost.

04 STi 16G powered lagless fun
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post #35 of 90 Old 02-17-2010, 09:07 AM
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Mosc is right about that "rule of thumb". I had asked about that when tuning my car. I lose about 8HP on my 91OCT maps per PSI with my 20G, and about 10-12 HP on my 92 OCT maps. With the vf 52 you wont see that much loss, just like most vf series turbos they ARENT going to pull up top anyways.

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"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"

Last edited by newtothegame; 02-17-2010 at 11:58 AM. Reason: mis spelled, sorry
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post #36 of 90 Old 02-17-2010, 10:21 AM
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Excellent point. Octane matters a ton.

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post #37 of 90 Old 02-17-2010, 11:20 AM Thread Starter
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newtothegame,

If I read it correctly, you were losing more hp/psi using your 92Oct map with your 20G turbo compared to the 91Oct map. Were you using 91Oct gas when you observed this? or it's primarily due to the bigger 20G turbo? (you mentioned that the vf is going to pull up top).
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post #38 of 90 Old 02-17-2010, 11:39 AM
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He's saying that when he runs higher octane, he gets more HP for a given pressure. This makes sense. Lets go back to physics:

Combustion engines make power by igniting AIR. AIR=POWER. Fuel is just a means to ignite the air. You can increase the force of the combustion by adding more air into the chamber. This is done through displacement (volume) compression, pressure, and air/fuel ratio. When you use higher octane, you need less fuel to ignite the air or more to the point, you will have more air in the chamber to ignite and make more power.

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post #39 of 90 Old 02-17-2010, 11:46 AM
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i heard its 10-12hp and depends on piping too. but you cant figure that for your car as your adding on more than just boost. if you had all the same parts and just put your injectors on and went from 15 to 20 psi then ya id say you might be looking at 10hp, so 50hp total. but with your intake and inlet and stuff you may see more.

as for turbo size there right. my 99 civic si with t3/t4 .70AR compresser, .68AR turbine, 3" inlet, 2.5" turbo to intercooler, 3" intercooler to throttle body, 24" X 12" X 3" intercooler, 3" full exhaust, tial 38mm EWG made 215hp on 7psi. she made 295 on 11psi, so thats 20psi per pound but because everything was so large!
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post #40 of 90 Old 02-17-2010, 11:56 AM
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You can get more power per lb of boost with higher octane, so when you remove boost you're losing more power.

-Chris
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post #41 of 90 Old 02-17-2010, 09:56 PM Thread Starter
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Does anyone have experience with Dyno at different boost setting?
Normally, when the turbo is cold, it's got better number. What's a reasonable time interval to cool down the turbo before the next run?
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post #42 of 90 Old 02-17-2010, 10:07 PM
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the subis do need to be started up for XXX seconds before a run can take place. the ECU or something has to get set. i only know this from saturdays tune. also you need to wait some time between runs, i dont no a time per say but we did a run when the car wasnt ready after being turned on. we got poor numbers, waited no time and tried again and poor numbers. the second run the intake and TMIC were way to hot. also you cant wait to long because the fan will kick on and blow hot air all over everything and get another bad run. if i had to guess 3-5 min between runs. 30 seconds after car starts. dont run if your fan is on or if your water temp is over 190 (you can monitor it with a gauge or if you use open source software, not sure about an AP)
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post #43 of 90 Old 02-17-2010, 10:28 PM Thread Starter
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my Baseline run was done in the early morning.
I believe the tuner turned on the car and let it run for a good 5 mins (minimum) cos he was booting up the computer and calibrating the settings. So basically, the turbo is cool and the car is warmed up enough.
The second run is right after (about 1 min after) and the number was a lot lower.

I am curious if one has to change the boost setting between runs. Should they go from higher boost to lower boost or vise versa? also is 3-5 mins enough to cool down the engine and turbo and TMIC?

Also, I think the big fan in front of the car is going to blow the hot air everywhere anyways.
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post #44 of 90 Old 02-18-2010, 04:04 PM Thread Starter
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Pick up is scheduled to be 4:00 p.m. PST

The tuner said the tune is at least a 6-hour job. I hope it turns out good.
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post #45 of 90 Old 02-18-2010, 09:04 PM
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6 hours? Thats an insane amount of time. Apparently he is starting from scratch and has no base map for you at all which is unfortunate. Good luck with it.

Joshua
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