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Old 12-23-2009, 10:28 PM   #1
medamullet
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I'm on CORN YO!

Default 2006 sti VF39 E85 4400' Elevation

I can't make 350 hp on cobbs dyno. BUT I did make 371 TQ


Event: Cobb Dyno
Location: Cobb
Ambient Temp: 38*F
Elevation: 4400'
Weather: Snowing outside
Track and Conditions: NA
Tires: Potenza RE019 225/45R 17 (Brand new)

Car: 2006 STI
Tuner:Keith Astley
Peak HP at RPM: 312
Peak Torque at RPM: 371
STi 2.5L
Target Boost: 27 psi (Accident, stock MAP won't keep up) Shooting for 24psi
Target AFR: 11.7
Fuel: E85
Engine/Power Modifications: 3" APS TBE Ceramic coated and heat wrapped
65mm APS CAI
3" APS inlet
Stock header ported Ceramic coated and heat wrapped
Grimmspeed Crossover pipe Ceramic coated and heat wrapped
Grimmspeed 38mm EWG up pipe Ceramic coated and heat wrapped
Tial 38mm EWG
Grimmspeed EBC
Grimmspeed MBC
Grimmspeed 8mm phenolic spacers
TGV deletes ported polished and Ceramic coated
20x7.5x4.5 TMIC (Core measurements)
830cc injectors
1 step colder plugs

Suspension Modifications:
17x8 45 offset RFP1 PC black
H brace
Front and rear strut town bars
Tanabe GF210 springs (stock struts)
27mm WL front Sway
22mm WL rear Sway
WL end links
Stainless brake lines
DBA 2 piece slotted Rotors
Hawk Blue pads
600* Brake fluid
CT Front splitter
255 40r 17 NT01 (track only tires on stock BBS)

Just another dyno with another set of numbers.... 312hp 371tq holding 18psi at redline on the stock BPV not crushed.



Oh, and I am maxing out my MAP sensor, so I can't read relative pressure right. I am hitting 27.1 psi on the stock turbo, knock free!

After talking with Christian, I need to take 10% out of my WGDC and buy a new MAP sensor so it will measure correctly. It should add another 10+Hp Too bad the dyno is going away. So nothing to compare it too.

AB spread sheet reads exactly the same numbers. My ECU Edit reads about 30hp more but same TQ. Now I know how to adjust my software to read exactly the same as Cobbs.

Too many variables they all can make huge differences. Just like from 1 dyno brand to another. That was my whole goal for running on Cobbs dyno. Now I have something to compare all my logs too.
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Last edited by medamullet; 12-26-2009 at 07:44 PM.
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Old 12-23-2009, 10:43 PM   #2
STi Mikey
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nice. I was on a mustang dyno once when i had my stock turbo. I hit 28.0 psi exactly. Holding boost on the vf doesnt seem to increase performance as it is just hot air that is moving at that point. I made 304 whp and 383 trq, it was quick. Even falling off to 14psi, I held 285.

What type of timing do you see at redline?? Im assuming your right around 21-23* at peak torque and run 31-33 at redline?
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Old 12-23-2009, 11:08 PM   #3
medamullet
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I would have to look at my logs. I thought I was hitting 24psi. I had no idea I was maxing out the MAP sensor until I hooked up to the dyno. I will make necessary changes and lower it down to something reasonable. I just think its weird that at 27psi I don't knock at all.
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Old 12-23-2009, 11:24 PM   #4
juanmedina
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Quote:
Originally Posted by medamullet View Post
I would have to look at my logs. I thought I was hitting 24psi. I had no idea I was maxing out the MAP sensor until I hooked up to the dyno. I will make necessary changes and lower it down to something reasonable. I just think its weird that at 27psi I don't knock at all.
E85 antiknock properties

I tough the MAP sensor only read to 22.7psi?
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Old 12-23-2009, 11:28 PM   #5
medamullet
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I get 24.38 on my logs. But once we hooked it to the dyno that **** went crazy to 27.1 psi. Obviously the sensor is maxed out. Haha oh well I will fix it.
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Old 12-23-2009, 11:30 PM   #6
juanmedina
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WRX VF39+E85 12.0, 121mph

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Quote:
Originally Posted by medamullet View Post
I get 24.38 on my logs. But once we hooked it to the dyno that **** went crazy to 27.1 psi. Obviously the sensor is maxed out. Haha oh well I will fix it.
What are you logging with?
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Old 12-23-2009, 11:38 PM   #7
medamullet
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OS and ecuedit. I have both I use. now knowing its wrong it kinda sucks, I wonder what else the stock ecu and sensors can't keep up with.
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Old 12-23-2009, 11:45 PM   #8
fourmicah
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Nice Jason
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Old 12-24-2009, 12:56 AM   #9
Deuce Cam
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That seems like an odd hp curve (peak @ 4800, and then falls off). Am I reading that correctly?
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Old 12-24-2009, 01:16 AM   #10
CatfaceType-R
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nice man, I bet she rips!
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Old 12-25-2009, 10:53 AM   #11
Audiosavvy
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LT1 Formula Firebird

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Thank you for editing your opening post to reflect the new format

Last edited by Audiosavvy; 12-29-2009 at 11:49 AM.
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Old 12-25-2009, 11:52 AM   #12
4ST-AIR
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TBD Looking for STI
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Quote:
Originally Posted by juanmedina View Post
E85 antiknock properties

I tough the MAP sensor only read to 22.7psi?
I m with you on that. I think that it can still read ~23psi but then its not accurate much after that. I don't recall ever hearing anyone reading up to 27psi on a stock MAP sensor though.
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Old 12-25-2009, 12:02 PM   #13
medamullet
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I obviously found out the stock MAP doesn't read 27.1. All my logs show 24.58 as the max. I was logging AND hooked up to the dyno so I could compare logs. The dyno would read 27 and the logs read 24. I am not sure where the cutoff is for accuracy. I was trying to run 24psi, so time for upgrade to at least a 3bar MAP I guess.
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Old 12-25-2009, 12:12 PM   #14
STi Mikey
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13' Benz, 15' WRX

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yeah, you need a boost gage after 24psi. Im right at 23 now, and for race gas I have to use my in car gage, or the if on the dyno, ill use that boost gage. But with the stock map sensor your laptop wont help when your leaning on your turbo.
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Old 12-25-2009, 05:55 PM   #15
medamullet
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Default

I have a defi red racer boost gauge. I should pugrade to something that can hold a peak boost number so I don't have to watch it while I am logging. Too dangerous for my liking. I will upgade the map as soon as I can make up my mind on which one to get. Then fix my WGDC and lower my boost a bit.
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Old 12-25-2009, 06:12 PM   #16
juanmedina
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07 FPgreen 7.37@95
WRX VF39+E85 12.0, 121mph

Default

Quote:
Originally Posted by medamullet View Post
I have a defi red racer boost gauge. I should pugrade to something that can hold a peak boost number so I don't have to watch it while I am logging. Too dangerous for my liking. I will upgade the map as soon as I can make up my mind on which one to get. Then fix my WGDC and lower my boost a bit.
I have the same problem I never know what I am really boosting .
I am getting the glowshift ELITE [FLAME SUIT ON] with recall feature
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Old 12-25-2009, 08:05 PM   #17
Kastley85891
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Needs an 05STI

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Quote:
Originally Posted by STi Mikey View Post
nice. I was on a mustang dyno once when i had my stock turbo. I hit 28.0 psi exactly. Holding boost on the vf doesnt seem to increase performance as it is just hot air that is moving at that point. I made 304 whp and 383 trq, it was quick. Even falling off to 14psi, I held 285.

What type of timing do you see at redline?? Im assuming your right around 21-23* at peak torque and run 31-33 at redline?
From memory Jason is around 28-30 degs up top, 22 ish at peak,, Medamullet , told ya dude, get that cheap ass SRTI mech boost gauge...

Like I said dude, that car gets up and goes

Last edited by Kastley85891; 12-25-2009 at 08:11 PM.
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Old 12-25-2009, 10:05 PM   #18
medamullet
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It is a rocket ship. I tell people and they don't believe me. From my road logs I hit full boost at 3100rpms. Its fast that's for sure. With my stig driver I am pretty sure I can hit low 12's. He was high 12's with 70 less tq.

The defi registers fine. I just need a new map sensor. I only hit 27 for a second in 4th gear. The defi actually reads correctly. I can see it spike in 4th then it drops. In 3rd gear it just hits 24 right where I want it to be.

Last edited by medamullet; 12-25-2009 at 10:16 PM.
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Old 12-25-2009, 10:46 PM   #19
Krang
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ej207 v8 vf37

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Cobbs dyno is not for the faint of heart if you care about #'s. First time I got my car tuned was on that dyno with John. Made some insignificant stock-ish # with my VF39 swap, got in the car after the tune a little disappointed and sad, that lasted exactly 1.5 minutes. The time it took me to make the right turn, go through the light, and hit the onramp, lol.
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Old 12-26-2009, 12:59 PM   #20
fourmicah
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Quote:
Originally Posted by Krang View Post
Cobbs dyno is not for the faint of heart if you care about #'s. First time I got my car tuned was on that dyno with John. Made some insignificant stock-ish # with my VF39 swap, got in the car after the tune a little disappointed and sad, that lasted exactly 1.5 minutes. The time it took me to make the right turn, go through the light, and hit the onramp, lol.
That's exactly what happened to me. I had a little more than a VF39, but I was expecting more from my set up and then I drove it and was smiling ear to ear.
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Old 12-27-2009, 03:57 PM   #21
FORCFED
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Where do you live? The reason i ask is that in PA where i live E85 is available but the mixture chnages to E70 or E75 in the winter. Do you run E85 all year with the same map or do you have a different one for the winter?
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Old 12-28-2009, 11:07 AM   #22
medamullet
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i live in utah. I hear rumors and such that our fuel is actually E75 all year long. I have no data to back that up. When I start my car in the winter I have to let it sit for a few minutes and warm up. It doesn't like to run in the winter when the car is cold. We goofed around with my ROM a few months ago to see if it would make a difference if we adjusted the fuel table. I think it helped a bit, but I still let it sit and warm up. It was 18* yesterday when my wife and I went to the movies and it started just fine. It's not that big of a deal really.
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