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hello Guys
all Camaro (this one is AT8 with NPP) when start up at cold goes up a bit on RPM and makes a good loud engine noise.
if you add a Borla Exhaust it becomes a real loud exhaust and neighbours are not happy
so, what's the way to lower the noise on start up and make it quiete?
if I think on genV Escalade you barely notice when you start the engine
thank you!
best regards
Try going to Engine > Exhaust > Min/Max ECTQuote:
Originally Posted by Christian GM
Set Min ECT to 300
Set Max ECT to -100
That should help a lot. By default, it retards the timing a bunch so that it's still combusting when the exhaust valves start to open which helps heat up the cats faster for emissions purpose. So on a cold start you're hearing more of the combustion process because of this, making it louder than normal.
Attachment 98124
EDIT:
To add, if you have dual mode exhaust, you can go to System > General > Exhaust Rumble Enable and change them all to 0 (or just the ones for the mode that you're in when you start your car at home). I lost my NPP exhaust when I went with a full exhaust that didn't have NPP feature so, I forget this part exactly. I'm pretty sure this is what forces it to start with the NPP valves closed.
Attachment 98125
The exhaust will be loud for the 1st 60-90 seconds. It is caused by the dual pulse timing that is used to help the cats fire off faster.
thank you both!Quote:
Originally Posted by Sneakyws6
the car has long tube headers with high flow cat.
so emission is not an issue at all
I will play with some number on Thursday morning opefully!
bye
Split pulse is disabled on my '18 SS A8 from the factory. I would think it would be on his as well. I'm pretty sure it's super low timing on start to get the cats to light off by igniting later so the exhaust valve will start opening while the combustion event is still happening making the exhaust hotter helping to light off the cats (best I can explain it :confused:) and doing this will stop it.Quote:
Originally Posted by Sneakyws6
Engine > Exhaust > Min/Max ECT
Set Min ECT to 300
Set Max ECT to -100
Let us know how it turns out!Quote:
Originally Posted by Christian GM
I am surprised the split pulse it turned off, the table is filled out and it is active on my 17 Camaro SS from the factory.Quote:
Originally Posted by g26er
As g26er has stated, the loud fire up and flair can be tuned out. The flair up will require changing other tables to have it start gently. But the 30-60 seconds of loud exhaust is exactly because of the timing being pulled back to near 0 to warm up the cats and the idle speed being set around 1000 RPM as well for the first few seconds.
IIRC split pulse is only used during cranking and not after the car is started and would have no influence on how the car sounds after you the starter disengages.
split pulse is only enabled for cranking on any genv tunes I have seen so far.
it works!
thank you all
Glad you got it!Quote:
Originally Posted by Christian GM
Stay safe everyone.
Quote:
Originally Posted by Higgs Boson
I can tell you for sure, the split pulse tables do affect start up and the 1st 60-90 seconds of run time. I had to fix the tables and put them back to stock when my tuner modified them. He had them zero'd out and the car did not start normally (it was quiet, didnt ramp up and would hunt for idle until it went to closed loop). As soon as I returned the split pulse table back to stock the car fired back up like stock with the aggressive ramp up, the high 1k RPM idle and the louder exhaust.
That table does more than just start the car, it stays active while the vehicle is in open loop and warming up the cats and then tappers off once the vehicle transitions over into closed loop.
Yes, most cranking and startup functions decay over time. We don't see very many tables in the E92.Quote:
Originally Posted by Sneakyws6
VCM Suite V5.0.4 does not have exhaust menu in Engine menu. How can I make quieter cold start up my Chevy Camaro 2017 6.2L V8. It's too much louder. My neiborhood are complaining a lot
You need to use version 4.10Quote:
Originally Posted by kbkgo
Thanks TriPinTaz. I got the old version and there are exhaust tab to modifications.