Road Dyno: Dahveed's STI before/after ECU reset... bad news for cali subies
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Road Dyno: Dahveed's STI before/after ECU reset... bad news for cali subies
Hey guys,
This was done on my friend's STI (dahveed here on i-club). We did all runs on the same night, same straight, flat road, and with the same people in the car. The car had a full tank of our lovely california 91 octane and I adjusted the vehicle weight in the road dyno for the three 6'1"+ guys in the car at the time.
Here's the road dyno:
We did several runs before resetting the ECU and they were very consistant. The yellow graph is the an average run I picked out of the set. Then we reset the ECU, did a couple data logging runs to let the ECU settle in, and did a couple more pulls on the road dyno. The red and blue graphs were back to back runs and as you can see they're VERY consistant.
Along with the dyno graphs, I did a couple data logging runs before and after the reset as well. Before the reset, knock correction values were in the 1-4 range and after the reset, they ranged from 7-12 and there was no sign of knock. So to conclude, the ECU had deffinately encountered knock in the past, probably on a nice hot day, and had pulled a good deal of timing and hence lowered power signficantly. We could deffinately feel the power difference after the reset.
Now Dahveed is trying to not get on it too hard during the hot days to prevent knock and keep his power up for the nice cool nights.
Thanks
-- Ed
This was done on my friend's STI (dahveed here on i-club). We did all runs on the same night, same straight, flat road, and with the same people in the car. The car had a full tank of our lovely california 91 octane and I adjusted the vehicle weight in the road dyno for the three 6'1"+ guys in the car at the time.
Here's the road dyno:
We did several runs before resetting the ECU and they were very consistant. The yellow graph is the an average run I picked out of the set. Then we reset the ECU, did a couple data logging runs to let the ECU settle in, and did a couple more pulls on the road dyno. The red and blue graphs were back to back runs and as you can see they're VERY consistant.
Along with the dyno graphs, I did a couple data logging runs before and after the reset as well. Before the reset, knock correction values were in the 1-4 range and after the reset, they ranged from 7-12 and there was no sign of knock. So to conclude, the ECU had deffinately encountered knock in the past, probably on a nice hot day, and had pulled a good deal of timing and hence lowered power signficantly. We could deffinately feel the power difference after the reset.
Now Dahveed is trying to not get on it too hard during the hot days to prevent knock and keep his power up for the nice cool nights.
Thanks
-- Ed
haha suckers!~
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i'm not saying it is this, but having four 6'1"+ guys in your car and going wot the whole time could have caused the car to knock on 91. thats a lot of extra weight in the car.
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Dahveed's STI is running a stock ECU.
There's nothing wrong with going WOT with three guys in the car.. a little more load, but nothing the car can't handle. I didn't hear it ping a single time the whole night... it was nice and cool out, and the ECU happilly advanced timing once it was reset.
The picture is back up now.
-- Ed
There's nothing wrong with going WOT with three guys in the car.. a little more load, but nothing the car can't handle. I didn't hear it ping a single time the whole night... it was nice and cool out, and the ECU happilly advanced timing once it was reset.
The picture is back up now.
-- Ed
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Originally Posted by vaus
Dahveed's STI is running a stock ECU.
There's nothing wrong with going WOT with three guys in the car.. a little more load, but nothing the car can't handle. I didn't hear it ping a single time the whole night... it was nice and cool out, and the ECU happilly advanced timing once it was reset.
The picture is back up now.
-- Ed
There's nothing wrong with going WOT with three guys in the car.. a little more load, but nothing the car can't handle. I didn't hear it ping a single time the whole night... it was nice and cool out, and the ECU happilly advanced timing once it was reset.
The picture is back up now.
-- Ed
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Originally Posted by Krinkov
actually the STI is notorious for pinging on the stock ECU, even without any extra load and even cool nights with 93 oct. and most ofthe actual detonation that occurs is inaudible
-- Ed
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Originally Posted by vaus
After resetting the ECU, it happily advanced timing run after run and stayed consistant. This means it did not detect any knock. This is what lead me to believe that prior to the reset, the ECU must have detected knock, but in different conditions.
-- Ed
-- Ed
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another thing to note... boost seems to come up quite slowly with the stock ECU. Dahveed's STI hit a max of 14.5psi at 5002RPM, 11.5 at 3500. Seems awfuly slow to me.
-- Ed
-- Ed