Techno Torque Dyno!!!!!!

[2K3_Boxster_S]

Originally Posted by JAAY

My air fuels are way too rich. I dont know what is up with that. I have the correct maf and my o2 sensors are good. I dont know what else. I need to change the spark plugs, there still the ones that I got the motor with. I probably should clean my air filter also. I am going to look into all that stuff tomorrow. Do you have a dyno graph for your 246?

yeah, post 87 http://www.987forum.com/forums/showthread.php?p=191477#post191477

oh, and I did change my plugs and gap them as well. I went ahead and tried these: http://www.pulstar.com/technology.htm

you should check out your plugs. might be an issue

[JAAY]

I have no air leaks. The car wouldn't idle correct if I did. It could be a few things. Small diameter cats designed for a 2.5. Gotta clean my air filter and change my plugs. I'll start there. Dynos are not good for measuring but good for before and after which is what we are doing here.

[blinkwatt]

Originally Posted by JAAY

I have no air leaks. The car wouldn't idle correct if I did. It could be a few things. Small diameter cats designed for a 2.5. Gotta clean my air filter and change my plugs. I'll start there. Dynos are not good for measuring but good for before and after which is what we are doing here.

My old 99' had a minor air leak after I cleaned the throttle body and it idled fine and took 500+ miles to set it off.

[Topless]

Probably another 30 hp left on the table from these curves. Get your exhaust breathing right for a 3.4L, remap A/F ratios and she will start singing.

[JAAY]

That is what I am thinking.. I am doing a basic tune up today. Clean the filter change the plugs. It is all in the mapping though. I am down in the mid 11's most of the chart and even down to 10.5 when it switches to high cam. I am going to talk to fvd later on maybe and see what there input is. I was looking at other 996 3.4 graphs and many of them make about 245 at the wheels. So I am not far from that and each dyno is different. I still have to go back for 2 more pulls just to see if the techno torque has actually synced up with the computer or not. Stay tuned. I do agree though that the reflash should be the next step.

[Kirk]

Jaay, I've seen very similar A/F curves for the Pontiac GTO. I just bought one and have been looking at a lot of dyno curves. With the GTO it's mapped to be very rich 10.5 to 11.0 throughout the rev band. Tuners then make a lot of money by just re-mapping the A/F ratio and giving the car 20 HP. Why does Pontiac do this though? Very simple - a rich mix is less prone to detonation, it's safer for the engine. My guess is that Porsche tunes their cars in a similar manner. An ECU reflash then would resolve this.

Kirk

[JAAY]

Yup.. trying to get in touch with rhonda over at fvd now..

[coreseller]

Originally Posted by Kirk

Jaay, I've seen very similar A/F curves for the Pontiac GTO. I just bought one and have been looking at a lot of dyno curves. With the GTO it's mapped to be very rich 10.5 to 11.0 throughout the rev band. Tuners then make a lot of money by just re-mapping the A/F ratio and giving the car 20 HP. Why does Pontiac do this though? Very simple - a rich mix is less prone to detonation, it's safer for the engine. My guess is that Porsche tunes their cars in a similar manner. An ECU reflash then would resolve this.

Kirk

I had to laugh when I read your post Kirk. I'm on my second GTO (first one got totalled by a 16 year old who had his license all of 4 days, he pulled out in front of me 2 years back) and got dang near exactly 20 hp from A/F adjustments alone. Now I know why it popped so much on second gear deceleration. VERY stout cars, got over 100k w/o issues from my first one and just turned over that in my newer one.....



Please keep us posted Jaay, I'm curious of the results.