Shoomakan
Grand Nagus
Good afternoon everyone,
I'd like some help understanding some things. I installed a 3" down-pipe back today and was measuring some before and after figures.
I'll start with MAF flow. Before I installed the @badger5 TIP, my highest MAF reading was 185 g/s. After I installed it, it jumped to 190 g/s. So there is a definite improvement there. Also, my Liquid Gauge read a maximum power of 188hp, and jumped to 202hp after the TIP. The car has an aftermarket K&N (original) filter on it that I clean every month.
A quick search of this site and others tells me a mapped S3 making the power I made (at the dyno) flows over 200 g/s. I can't get it past 190; but I'm still making power. Last dyno on stock exhaust was 259 to the front wheels (corrected). I've installed a TIP, 3" exhaust, and a more aggressive map since then.
I double checked the correct MAF part number here, and confirmed I have the correct one. What could be causing low MAF figures but still yielding good numbers? I've scratched my head about this for weeks now and really can't think of anything. My car was dynoed at sea level; it's also driven/raced at sea level. In my mind this should IMPROVE air density, not make it worse.
Problem number 2, which I suspect is related to problem number 1, is low power/torque figures from my Liquid gauge display (and laptop tuning software). Before I installed the exhaust today, my peak power was 202hp. After the exhaust, it jumped to 234 hp. And yet, my g/s reading is STILL 190 g/s. How would it measure an increase in power without also measuring an increase in air flow?
All other Liquid functions are working wonderfully, which leads me to believe the problem is not the gauge itself (especially as figures are near identical if not so from 2 sources, gauge and laptop). I have read the Liquid user manual, and the only thing I feel may manipulate those numbers is the MAF adaptation, which comes calibrated for a stock MAF from Liquid. So I don't see why I should make up any numbers that will bring me closer to my dyno figure. It's a stock unit after all.
I'd like to close this by saying that the 3" exhaust produced a noticeable increase on the butt dyno. Whether or not it added 32hp to my mysterious total, it definitely hauls more *** now. Sounds great, too! For those curious, I'm running a 3" downpipe connected to a 3" pipe all the way back to a Magnaflow muffler now.
ps: tests were done shifting to 7K rpm.
I'd like some help understanding some things. I installed a 3" down-pipe back today and was measuring some before and after figures.
I'll start with MAF flow. Before I installed the @badger5 TIP, my highest MAF reading was 185 g/s. After I installed it, it jumped to 190 g/s. So there is a definite improvement there. Also, my Liquid Gauge read a maximum power of 188hp, and jumped to 202hp after the TIP. The car has an aftermarket K&N (original) filter on it that I clean every month.
A quick search of this site and others tells me a mapped S3 making the power I made (at the dyno) flows over 200 g/s. I can't get it past 190; but I'm still making power. Last dyno on stock exhaust was 259 to the front wheels (corrected). I've installed a TIP, 3" exhaust, and a more aggressive map since then.
I double checked the correct MAF part number here, and confirmed I have the correct one. What could be causing low MAF figures but still yielding good numbers? I've scratched my head about this for weeks now and really can't think of anything. My car was dynoed at sea level; it's also driven/raced at sea level. In my mind this should IMPROVE air density, not make it worse.
Problem number 2, which I suspect is related to problem number 1, is low power/torque figures from my Liquid gauge display (and laptop tuning software). Before I installed the exhaust today, my peak power was 202hp. After the exhaust, it jumped to 234 hp. And yet, my g/s reading is STILL 190 g/s. How would it measure an increase in power without also measuring an increase in air flow?
All other Liquid functions are working wonderfully, which leads me to believe the problem is not the gauge itself (especially as figures are near identical if not so from 2 sources, gauge and laptop). I have read the Liquid user manual, and the only thing I feel may manipulate those numbers is the MAF adaptation, which comes calibrated for a stock MAF from Liquid. So I don't see why I should make up any numbers that will bring me closer to my dyno figure. It's a stock unit after all.
I'd like to close this by saying that the 3" exhaust produced a noticeable increase on the butt dyno. Whether or not it added 32hp to my mysterious total, it definitely hauls more *** now. Sounds great, too! For those curious, I'm running a 3" downpipe connected to a 3" pipe all the way back to a Magnaflow muffler now.
ps: tests were done shifting to 7K rpm.
