Stupid Vararam tuning Question.
Thread Starter
Burning Brakes
Joined: Nov 2006
Posts: 1,098
Likes: 0
From: Yorkville IL
Stupid Vararam tuning Question.
Please excuse my lack of knowledge..but..When you install a Vararam intake that will force more air into engine as your speeds increase how can you tune for it on a dyno that doesn't account for the increase air flow.... as per maybe 100mph as compared to a fan on a dyno? Or are those changes not really that big.
Trapp
And no I'm not buying a fan from NASA for tuning.
Trapp
And no I'm not buying a fan from NASA for tuning.
Former Vendor
Joined: May 2005
Posts: 3,749
Likes: 4
From: Valencia Ca
At WOT the ecm is commanding a programmed set of instructions and it is in open loop - no learning here. If the MAF is still in range it will fuel accordingly, though. Run a wideband and change if you aren't optimized.
Safety Car
Joined: Feb 2007
Posts: 4,684
Likes: 107
From: Opelika Alabama
It's not a total picture - the ecm will make changes to the closed loop operation but only within its confines and sometimes, the LTFT's after a VR will fall outside the envelope and you need to recal.
At WOT the ecm is commanding a programmed set of instructions and it is in open loop - no learning here. If the MAF is still in range it will fuel accordingly, though. Run a wideband and change if you aren't optimized.
At WOT the ecm is commanding a programmed set of instructions and it is in open loop - no learning here. If the MAF is still in range it will fuel accordingly, though. Run a wideband and change if you aren't optimized.
more air in, more air out=tune
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
on almost all setups you should be fine without a tune for just an intake. I ran my vararam for months without a tune and I had no issues. Not saying you wont but if you notice decreased performance tune it. If you plan on doing more mods wait till you get em and tune it then.
Thread Starter
Burning Brakes
Joined: Nov 2006
Posts: 1,098
Likes: 0
From: Yorkville IL
on almost all setups you should be fine without a tune for just an intake. I ran my vararam for months without a tune and I had no issues. Not saying you wont but if you notice decreased performance tune it. If you plan on doing more mods wait till you get em and tune it then.
