As previously mentioned in some other threads, I bothered to take a bunch of logs with my car in plain stock form with nothing different on it than a soler throttle controller, but as we all know that doesn't add power, just throttle response to your liking.
With about 20 base logs i was able to get a couple good ones that were most indicative of the best average of all the logs i had taken while having to throw out some of them due to realizing the car was cutting fuel and thus absolute load as well as seen in the channels i logged via hptuners vcmscanner after realizing i wasn't in the right PTM mode and then realizing that it was still happening in race 2 mode and had to press traction control off for 7 seconds for all nannies to be off for more consistent logs.
There's a fair bit of excel editing to get rid of extraneous rows and playing with throttle position to get it to graph right. I had pressure and ambient air temperature monitored in my channels in my MPIV2 tool so i could SAE correct for each log. Tried to use the same road in its flattest spots as much as possible to keep the logs as reproducible and comparable to each other as possible.
So the first mod that this graph is showing was the addition of my unobtainium sport cats. They are a GESI 85500 and they bolted up absolutely perfectly and stock box had no fitment problems with them when i put it back in. I highly recommend using synthetic grease on the inside of the couplers when putting them back on otherwise you will just be fighting yourself when trying to get it back on if you aren't doing an intake upgrade. Also its far easier to attach the couplers to the airbox and then shove the assembly onto the intake.
First i'll gab on about some subjective aspects about these sport cats. Definitely definitely louder. I think its probably a solid 15dB louder on startup but i had no fancy dB tester to compare before and after. i will try to post a stock start up in my garage with the first fire up of these sport cats and you should be able to tell some differences with good heeadphones or good speakers.
Definitely also has a lot more breath and growl to the exhaust at the high idle after cold start and then even at low idle its very pleasing to hear more flat plane big displacement rumble well over general valvetrain noise and such. At higher rpm the F1 and exotic nature of the exhaust is definitely accentuated with resonance (good resonance being much more present). I also noticed a little more drone right at 3000 rpm but i never stay there ever so i don't care. Lastly the pop/bang/crackle on decel when having full open on valves is honestly almost to the point where its a little much. Absolutely crazy on how much noise on sudden decel. The bangs on up shift on hard throttle are also more pronounce and more pleasing when getting on it. Combine this magnetic paddles and you have smiles for days.
Now back to the graph from virtual dyno. Massive disclaimer, vdyno is nothing more than a fun tool to just simply note trends and differences but everything has to be taken with some serious grains of salt as its nothing even close to a true dyno that has a lot more controls vs. the anomalies in a stretch of road and wind variations, no guarantee of perfectly flat elevation etc. That said, the red and green curves are post sport cat install whereas the blue and orange curves are stock. It should be noted that the most comparable curves are the orange stock curve and the green sport cat curve as these were both logs from the same piece of road in the same areas. The blue curve was a log performed on a different road but included because it was good to see significantly similar logs in the same stock form but in separate locations.
From what the curves are showing in virtual dyno it would appear that negligible if any power was really made from stock to its new form with these sport cats, however even the graphs show something that i definitely noticed in that the rise through the powerband felt noticeably smoother and refined in the sense that it didn't seem to have the subtle swings of larger torque and slight mid range sagginess before coming back. It was much much more uniform in the powerband climb.
I think the real shine is the engagement with letting the car's engine truly sing and bark as it wishes instead of being choked. I also think the real shine will be when the car gets to breathe more oxygen in its next step of the transformation with 92mm TB's and eventuri which are going in next. Should be interesting to see the final logs being done after those installs; but those logs will have to wait as I have a rather significant roadtrip of 2000km to put on the car with the fresh mods before i get to "putting it back on the (virtual) dyno" lol.
i also included just the baseline stock curves which are shown in red and blue but are the same graphs in the combined 4 plots although the pens change colors between the two. the red in the first graph becomes orange, and the blue one remains consistent in both.
Cheers, hope this information helps someone.
p.s. i regret nothing on the install of the cats, i absolutely love how more engaging and F1'ish the car sounds. I'm not sure i need to bother with the 841 concept header now as i think this really fits the bill for me.
With about 20 base logs i was able to get a couple good ones that were most indicative of the best average of all the logs i had taken while having to throw out some of them due to realizing the car was cutting fuel and thus absolute load as well as seen in the channels i logged via hptuners vcmscanner after realizing i wasn't in the right PTM mode and then realizing that it was still happening in race 2 mode and had to press traction control off for 7 seconds for all nannies to be off for more consistent logs.
There's a fair bit of excel editing to get rid of extraneous rows and playing with throttle position to get it to graph right. I had pressure and ambient air temperature monitored in my channels in my MPIV2 tool so i could SAE correct for each log. Tried to use the same road in its flattest spots as much as possible to keep the logs as reproducible and comparable to each other as possible.
So the first mod that this graph is showing was the addition of my unobtainium sport cats. They are a GESI 85500 and they bolted up absolutely perfectly and stock box had no fitment problems with them when i put it back in. I highly recommend using synthetic grease on the inside of the couplers when putting them back on otherwise you will just be fighting yourself when trying to get it back on if you aren't doing an intake upgrade. Also its far easier to attach the couplers to the airbox and then shove the assembly onto the intake.
First i'll gab on about some subjective aspects about these sport cats. Definitely definitely louder. I think its probably a solid 15dB louder on startup but i had no fancy dB tester to compare before and after. i will try to post a stock start up in my garage with the first fire up of these sport cats and you should be able to tell some differences with good heeadphones or good speakers.
Definitely also has a lot more breath and growl to the exhaust at the high idle after cold start and then even at low idle its very pleasing to hear more flat plane big displacement rumble well over general valvetrain noise and such. At higher rpm the F1 and exotic nature of the exhaust is definitely accentuated with resonance (good resonance being much more present). I also noticed a little more drone right at 3000 rpm but i never stay there ever so i don't care. Lastly the pop/bang/crackle on decel when having full open on valves is honestly almost to the point where its a little much. Absolutely crazy on how much noise on sudden decel. The bangs on up shift on hard throttle are also more pronounce and more pleasing when getting on it. Combine this magnetic paddles and you have smiles for days.
Now back to the graph from virtual dyno. Massive disclaimer, vdyno is nothing more than a fun tool to just simply note trends and differences but everything has to be taken with some serious grains of salt as its nothing even close to a true dyno that has a lot more controls vs. the anomalies in a stretch of road and wind variations, no guarantee of perfectly flat elevation etc. That said, the red and green curves are post sport cat install whereas the blue and orange curves are stock. It should be noted that the most comparable curves are the orange stock curve and the green sport cat curve as these were both logs from the same piece of road in the same areas. The blue curve was a log performed on a different road but included because it was good to see significantly similar logs in the same stock form but in separate locations.
From what the curves are showing in virtual dyno it would appear that negligible if any power was really made from stock to its new form with these sport cats, however even the graphs show something that i definitely noticed in that the rise through the powerband felt noticeably smoother and refined in the sense that it didn't seem to have the subtle swings of larger torque and slight mid range sagginess before coming back. It was much much more uniform in the powerband climb.
I think the real shine is the engagement with letting the car's engine truly sing and bark as it wishes instead of being choked. I also think the real shine will be when the car gets to breathe more oxygen in its next step of the transformation with 92mm TB's and eventuri which are going in next. Should be interesting to see the final logs being done after those installs; but those logs will have to wait as I have a rather significant roadtrip of 2000km to put on the car with the fresh mods before i get to "putting it back on the (virtual) dyno" lol.
i also included just the baseline stock curves which are shown in red and blue but are the same graphs in the combined 4 plots although the pens change colors between the two. the red in the first graph becomes orange, and the blue one remains consistent in both.
Cheers, hope this information helps someone.
p.s. i regret nothing on the install of the cats, i absolutely love how more engaging and F1'ish the car sounds. I'm not sure i need to bother with the 841 concept header now as i think this really fits the bill for me.
