Guys, I'm running a Vararam and stock MAF in my intake setup but my MAF frequency/gms per sec look pretty jagged. Obviously this would throw off my tune and hurt fuel economy. I have a spare maf but its a PITA to swap it since the current one is stuck on the vararam. Before I go swapping things, has anyone else seen this behavior in cold weather and is it normal? I'm guessing a variation of ~30 gms/sec at WOT (55gms/sec to 85gms/sec with no throttle or RPM changes) is not good.
My only guess is that you are injesting some water or moisture into the air tract--(could be even just fog) and the Vararam is prone to that because of its design as it is any true ram air system.Any moisture would make the fine wires in the MAF give you some spikes or false readings---Lately there has been a lot of talk about filter oil causing the same issues with open air boxes making the MAF's go haywire.Some manufacturers have gone to oiless filter elements because of this.
Thx for the suggestion, I'll try cleaning the MAF again in case there is any filter oil on there. There isn't much chance of moisture in the air here in CT, its been like 20 deg during the day and single digits at night!
If you haven't corrected your MAF table for the Vararam, that's your problem. The stock air filter channels the intake air through/across the centre of the screened MAF, and the table is designed to read it accurately. If you want a good table to start with, use the values from a 6.0 litre truck MAF, and tune from there. If you've already done this, then I too would suspect oil on the MAF wires.
__________________
Best regards,
Bill
Calgary, Alberta, Canada
2003 Quicksilver roadster , 1SB, F55, QF5, MN6, Z06 Ti catback, 2 cat H-pipe & air lid, Euro red/amber tails, Vette Net, and HP Tuners s/w - available for free to anyone in Calgary
My only guess is that you are injesting some water or moisture into the air tract--(could be even just fog) and the Vararam is prone to that because of its design as it is any true ram air system.Any moisture would make the fine wires in the MAF give you some spikes or false readings---Lately there has been a lot of talk about filter oil causing the same issues with open air boxes making the MAF's go haywire.Some manufacturers have gone to oiless filter elements because of this.
with my vararam, Ive driven in 3 1/2 hours in the pouring rain in the highway and highway speed, and the grey filter, and I didnt get water in anything !
Like any other intake system, if you submerge it in water, it will suck some up. Not in normal driving conditions.
Ive had the vararam on for 4 years and my throttle body is hardly dirty.
Corvette Store
Jagged MAF Log/graph in cold weather?
