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Old 09-08-2008, 11:49 AM   #1
subadupa
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Default Streetlife tour sponsored by NOS in Dayton Ohio

So I arrive at SLT around 7:30 p.m. and when I do I see a lot of Evo's and Subaru's running. I am like sweet it's gonna be a good night. Well then I see what they are running. 1 out of the 3 evo's broke 14's hitting a 12.45 @ 110 MPH. Now on to the Subaru's 5 Subaru's running 3 out of the 5 hit a 14.0 best @ 96 MPH the other 2 that hit better were mine and 1 one other which was an STI. I have ran my car consistently in the high 12's even missing a gear before still hit 12's with my trap speeds of 110 MPH (not missing a gear). Last night the STI hit 13.2 @ 100 MPH and my personnal best last night was a 13.2 @ 106 MPH. now here is my question. What could be wrong? All these cars including mine were running liek ****... I am going to check for any leaks because the car didn't pull anywhere near as good as what it used to. On top of that I couldn't find 4th for ****.

1 of my time slips read like this

60' 2.068 (I can't launch for **** either)
1/8th 85.53 MPH
1/4 13.2 @ 106 MPH

Tim Bailey if ou see this thread might you be able to tell me what is going on. Should I relfash my ECU
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Old 09-08-2008, 12:02 PM   #2
Phatron
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Cause its hot out right now.....

But your 106mph trap shows you could've gotten into the 12's even last night...taking your 60' down to 1.7 would get you around a 12.6-12.7.

Can you post up a slip from before? The thing to pay attention to is the trap speed. If you were trapping the same as you did before, then it is simply your driving....if you trapped lower this time, then the weather and/or track prep could've caused it. But again your 106mph trap is good for 12.6-12.7 so i really think you just had a bad driving night.

If you really want see what you could've trapped at sea level you can get the weather here
http://www.wunderground.com/

calculate the density altitude here
http://wahiduddin.net/calc/calc_da.htm

then use the correction factors here based on the DA
http://www.smokemup.com/auto_math/nh...on_factors.php
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Old 09-08-2008, 12:06 PM   #3
subadupa
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Thank you!
It was actually pretty cool out here. 70 degrees and I ran at 8 p.m. so no sun. The track prep was horrible everyone we saw were running pretty crappy. I have trapped 110 MPH at this same track in 75 degree weather about 3 months ago with a 12.9 1/4 mile. I am just worried it is my car. I am still runnign stock tranny so I am scared to launch hard at all.

I can get a timeslip on here from last night and can check if I can find my other one. We recently moved so I gotta do some searching.
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Old 09-08-2008, 12:14 PM   #4
Phatron
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There are several things in the ECU that can come into play

Intake Air Temperature Compensation table
- this table will start pulling timing ~100*F IAT
- sitting in the staging lanes your car was likely seeing IAT's higher than this and pulling 1-4* of timing throughout the whole run
- but like you said it was hotter before so this isnt likely the culprit, unless there were more people at the track this time and you had to wait longer in the staging lanes causing the IAT's to rise

Atmospheric Boost & WGDC Compensation, IAT WGDC Compensation
- there are these compensation tables in the ECU, depending on how they are setup you could have been running more boost when it was hotter. I believe the stock maps raise the WGDC through both the ATM and IAT comp tables.....so you actually could've been running more boost when it was hotter.
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Old 09-08-2008, 12:39 PM   #5
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Reset the ECU and add a couple of gals of 100 or 104oct in at the track and make a few easy runs before dropping the hammer.
OR
Reset the ECU before you go, and fill up before the track. Once you start running warm at the track on straight pump gas your just going to start pulling timing and put all kinds of WHP on the table. Even if your not tuned for the 100-104oct it will help keep the car from pulling so much timing over just regular pump gas. (Info given to me by my tuner at the Subaru Midwest 2008 Shootout)
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Old 09-08-2008, 12:39 PM   #6
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Edit: NASIOC Double post voodoo!
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Old 09-08-2008, 01:04 PM   #7
subadupa
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I am tuned for 104 unleaded race gas. I could try running that.
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Old 09-08-2008, 01:41 PM   #8
subadupa
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What happens to my timing say when I drive my car for a whole week on the highway for work and barely hit boost and getting 350 miles + to a tank of gas as opposed to getting on my car and getting 250 miles to tank of gas.. Here are my mods

MODS:
Forced performance 18G (TD06SL2) ported turbo
Deatschwerks 750 CC injectors
Walbro 255L fuel pump
NGK 1 step colder plugs
Godspeed topmount
Apexi 3" catless downpipe
Apexi 3" catback exhaust

Dynoed Tuned @ Buschur Racing:
Pro tuned by Tim Bailey from Surgeline tuning
19 PSI on pump gas & 20 PSI on 104 GT Plus race gas

Dynoed on Buschur racing mustang dyno:
19 PSI (pump gas) = 300 WHP & 315 WTQ
20 PSI (race gas) = 320 WHP & 340 WTQ
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Old 09-08-2008, 03:15 PM   #9
Badler
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You only went up 1psi on your race gas tune?
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Old 09-08-2008, 03:20 PM   #10
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Quote:
Originally Posted by aaronmsadler View Post
You only went up 1psi on your race gas tune?
Stock Gears he would shatter them in heartbeat. That's on the Buschur Heartbreak Dyno so add about 10% (so they say) to get a Dynojet power estimation which calculates pretty high for 18G on just 104oct.

Basically beating on the car at the track on pump = pulling a crap load of timing to the learned corrections table for future look-up. Basically its a reference point your ECU will use to stop knock and so forth.

If you reset the ECU on the pump map its not going to reset the Race Gas mappings. Switch gas and maps and have at it next time you are at the track.

Last edited by 4ST-AIR; 09-08-2008 at 03:29 PM.
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Old 09-08-2008, 03:28 PM   #11
subadupa
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Quote:
Originally Posted by 4ST-AIR View Post
Stock Gears he would shatter them in heartbeat.

Basically beating on the car at the track on pump = pulling a crap load of timing to the learned corrections table for future look-up. Basically its a reference point your ECU will use to stop knock and so forth.

If you reset the ECU on the pump map its not going to reset the Race Gas mappings. Switch gas and maps and have at it next time you are at the track.
So ur basically saying reflash the ECU at the track with the 104 octane map but actually run 93 octane??
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Old 09-08-2008, 03:55 PM   #12
Phatron
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no he said either

1) fill up on 104, reset ecu and run on your 93 MAP

or

2) fill up on 104, reset ecu and run on your 104 MAP

Resetting the ECU will clear your FLKC tables and AF Correction tables.
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Old 09-08-2008, 04:00 PM   #13
subadupa
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Oh okay gotcha. What should the car trap on 104 and or pump gas?
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Old 09-08-2008, 05:08 PM   #14
Phatron
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^^ it all depends on where you are.....weather, elevation, track conditions, etc.

but if you trapped 110mph before on pump, then i would say 112-115mph is good on 104.
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Old 09-08-2008, 05:50 PM   #15
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Quote:
Originally Posted by Phatron View Post
no he said either

1) fill up on 104, reset ecu and run on your 93 MAP

or

2) fill up on 104, reset ecu and run on your 104 MAP

Resetting the ECU will clear your FLKC tables and AF Correction tables.
Thank you Ron
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Old 09-08-2008, 06:12 PM   #16
subadupa
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Thanks guys! Helped a bunch
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Old 09-08-2008, 06:57 PM   #17
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Yeah around here those 106-107 mph traps are about what I run with 250WHP on that same dyno. +1 for reset with race gas. Good luck man... My 18G will be on next week!
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Old 09-08-2008, 10:43 PM   #18
subadupa
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Quote:
Originally Posted by jmlaser View Post
Yeah around here those 106-107 mph traps are about what I run with 250WHP on that same dyno. +1 for reset with race gas. Good luck man... My 18G will be on next week!
Let me know what you run. I am due for he reflash. I haven't reflashed it in a few months.
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