Joined
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2,903 Posts
So since i got the Weber carb I've had the tuning bug. First I installed a wideband O2 sensor to get the carb dialed in. Then I thought about having it dynoed, but dyno time is expensive. Enter the LMA-3 from Innovate Motorsports:
http://www.innovatemotorsports.com/products/lma3.php
With this and a laptop I can log MAP, RPM, sideforce, acceleration force, speed, and AFR. So I get it all hooked up and take it for a spin. I recorded this from a 2nd gear pull:
This is a graph of HP, torque, speed , RPM, and AFR. The wierd part here is that the HP seems really low. I know this is wheel HP and that there is some loss in the drivetrain but I would think no more than maybe 15%. The engine is a freshly rebuilt A18 bored out to 2.0L, with a mildly worked head, stage 1 cam and Weber 38/38 carb. The only thing I can figure is that the exhaust is totally killing it, but that would be a little surprising since it has some sort of aftermarket exhaust.
Comments?
Oh, and I'm assuming a vehicle weight of 2200lbs. Too light maybe?
C|
http://www.innovatemotorsports.com/products/lma3.php
With this and a laptop I can log MAP, RPM, sideforce, acceleration force, speed, and AFR. So I get it all hooked up and take it for a spin. I recorded this from a 2nd gear pull:

This is a graph of HP, torque, speed , RPM, and AFR. The wierd part here is that the HP seems really low. I know this is wheel HP and that there is some loss in the drivetrain but I would think no more than maybe 15%. The engine is a freshly rebuilt A18 bored out to 2.0L, with a mildly worked head, stage 1 cam and Weber 38/38 carb. The only thing I can figure is that the exhaust is totally killing it, but that would be a little surprising since it has some sort of aftermarket exhaust.
Comments?
Oh, and I'm assuming a vehicle weight of 2200lbs. Too light maybe?
C|