How lean is to lean? Plus dyno run on STS.

Reply Subscribe

Thread Tools

Search this Thread

Nov 1, 2005 | 01:04 PM

#11

1SlowHoe

Destroyer of Transmissions

iTrader: (28)

Joined: Feb 2005

Posts: 4,962

Likes: 1

From: Orlando, FL

I got mine dyno tuned with a wide band for $250 bucks. 6-700 seems way high. Of course mine blew up a week later,

, just kidding John (Tuner) Just make sure you have big enough injectors and pump capacity to feed them. But the price sounds high on the tune, shop around.

Nov 1, 2005 | 02:04 PM

#12

zippy

TECH Veteran

Joined: Sep 2003

Posts: 4,534

Likes: 3

From: Las Vegas, NV

under wide open the computer isn't going to pull fuel from a rich condition. you simply don't have enough injector. you're going to need at least 30's. i'd recomend stepping up to a 42 though.

Nov 1, 2005 | 02:40 PM

#13

TurboAv

Thread Starter

TECH Fanatic

iTrader: (6)

Joined: Oct 2005

Posts: 1,471

Likes: 0

From: Tonopah, AZ

Yeah I am going to go with the delphi 42's and a walbro pump. Then more boost!

Nov 1, 2005 | 02:57 PM

#14

ktmrider

TECH Fanatic

Joined: Apr 2003

Posts: 1,107

Likes: 2

From: Albuquerque, NM

Quote:

Originally Posted by Yellowsierra

I think I know what your problem is. When your meth. comes on its telling your o2's your running really rich so it backs off your fuel supply. Your o2 will read 900mv but meth reads alot higher than fuel so your cpu thanks your at the right a fuel ratio while your really running way lean. The only way to get it tuned right is to use a wideband or at the dyno. Oh yeah you also need some 42 lb. injectors

I agree. Also remember that you will run 0.5-1.0 points A/F leaner on the street than on the dyno ( unless using Mustang load style ). Your computer is calibrated to run at 14.7:1 A/F under N/A conditions and is tuning out the benefits of the meth.
Get rid of the stoic 14:1 and go with the bigger injectors, pump, and custom tune. Your engine and pistons will live/love you for it!