Dyno results for a 2.2L

Ru fan · 04-27-2002, 10:09 PM

I have a 98 impreza wagon. The clamed hp is 137 at the crank. It is an almost stock drivetrain with the single ehaust port heads. The only mods I have are as follows.
-removed intake scilencer
-JUN FW 12lbs
-ACT clutch
-Stromung S/S axle back Dual tip
I guess the only one that really counts on the dyno is the exhaust.

*Drum roll*

Hp=93.3 @5200 (quickly drops off after 5200)
Tq=111 @3700

What can I say...she is a Dyno Queen!

How do I read the AFR charts? I have no idea what they mean. I heard that NA cars are supposed to have around 12:1 or something like that. I don't really know what that means though. How can I use this data to tune my car?

Later,
Seth E.

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roninscar · 04-28-2002, 09:01 AM

The AFR can tell you how much power is being lost to conservative fuel mapping. The ideal stoichometric(sp?) balance would be 14.7 to 1, but this is pretty dangerous and extra fuel is added in order to keep the engine from running too lean and looking for other fuel sources to burn, stuff like pistons, valves etc. So lowering the ratio will help keep exhaust temps down and keep from burning pistons, but it will suck some performance from the beast as you are not combusting near peak efficiency.

Do a search on fuel controllers, there should be a discussion there on a method used by some RS owners to raise the ratio in the higher revs to increase power. The stock maps typically have the afr diving in the higher revs.

Regards,
scotto

Tkacik · 04-28-2002, 05:34 PM

Wow those are pretty impressive numbers.

Kevin Thomas · 04-28-2002, 05:47 PM

Seth,

Will you be posting a scanned pic of the dyno chart itself? Then we can see details as to how the powerband is.

Ru fan · 04-28-2002, 09:28 PM

I can't post the charts because of the size. I can't compress the charts because I don't have the software. I will see what I can do though. Give me a few days, maybe I can figure something out.
<---Doesn't know shiznit about computers

Later,
Seth E.

MGXsport · 04-28-2002, 09:58 PM

I'd like to see the chart also.

<----

You can get a good image resizer for free at downloads.com

Search for Ifran View.

Chris

04-27-2002, 10:09 PM	#1
Ru fan Scooby Specialist Member#: 1605 Join Date: Jun 2000 Chapter/Region: NESIC Location: Middletown, CT USA Vehicle: 1997 1.8L Brighton NESIC TrackH0z member#1	Dyno results for a 2.2L I have a 98 impreza wagon. The clamed hp is 137 at the crank. It is an almost stock drivetrain with the single ehaust port heads. The only mods I have are as follows. -removed intake scilencer -JUN FW 12lbs -ACT clutch -Stromung S/S axle back Dual tip I guess the only one that really counts on the dyno is the exhaust. Drum roll Hp=93.3 @5200 (quickly drops off after 5200) Tq=111 @3700 What can I say...she is a Dyno Queen! How do I read the AFR charts? I have no idea what they mean. I heard that NA cars are supposed to have around 12:1 or something like that. I don't really know what that means though. How can I use this data to tune my car? Later, Seth E. * Registered users of the site do not see these ads.

04-28-2002, 09:01 AM	#2
roninscar Scooby Newbie Member#: 2306 Join Date: Sep 2000 Location: Orlando, FL, USA Vehicle: 2000 RS Sedan Blue Ridge Pearl	AFR The AFR can tell you how much power is being lost to conservative fuel mapping. The ideal stoichometric(sp?) balance would be 14.7 to 1, but this is pretty dangerous and extra fuel is added in order to keep the engine from running too lean and looking for other fuel sources to burn, stuff like pistons, valves etc. So lowering the ratio will help keep exhaust temps down and keep from burning pistons, but it will suck some performance from the beast as you are not combusting near peak efficiency. Do a search on fuel controllers, there should be a discussion there on a method used by some RS owners to raise the ratio in the higher revs to increase power. The stock maps typically have the afr diving in the higher revs. Regards, scotto

04-28-2002, 05:47 PM	#4
Kevin Thomas Street Racing Instructor Moderator Member#: 110 Join Date: Jul 1999 Location: 1997 OBS, 1996 SVX, 1988 RX Vehicle: 1989 1989 XT6	Charts Seth, Will you be posting a scanned pic of the dyno chart itself? Then we can see details as to how the powerband is.

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04-28-2002, 05:34 PM	#3
Tkacik Scooby Guru Member#: 847 Join Date: Feb 2000 Chapter/Region: South East Location: Milledgeville, Georgia Vehicle: '06 Titan Crew Cab '03 Odyssey - EXL/RES	Wow those are pretty impressive numbers.

04-28-2002, 09:28 PM	#5
Ru fan Scooby Specialist Member#: 1605 Join Date: Jun 2000 Chapter/Region: NESIC Location: Middletown, CT USA Vehicle: 1997 1.8L Brighton NESIC TrackH0z member#1	I can't post the charts because of the size. I can't compress the charts because I don't have the software. I will see what I can do though. Give me a few days, maybe I can figure something out. <---Doesn't know shiznit about computers Later, Seth E.

04-28-2002, 09:58 PM	#6
MGXsport Scooby Specialist Member#: 4048 Join Date: Feb 2001 Chapter/Region: NWIC Location: Honolulu & Coulee City Vehicle: '06 Scion tC Flinty '99 Escalade Poo color	I'd like to see the chart also. <---- You can get a good image resizer for free at downloads.com Search for Ifran View. Chris