UPD Intake

[02Blue]

This thread is is a continuation of an earlier thread which I haven't posted to since 16OCT02. Here is the link

 

http://www.gm-trucks.com/cgi-bin....t=12562

 

Recap:

Started out totally stock. Added UPD intake with K&N filter.

Results:

Lost a little mpg. And, I've come to realize that I also lost a little low end torque.

What I tried to correct losses:

Every combination of OEM parts and UPD kit parts. Filter housings and filters included.

What I currently run and am sticking with:

UPD kit and paper filter instead of K&N. Its the best SOP configuration for my truck. Gas mileage is at about 17mpg average. Torque and throttle response is better than OEM. The low end torque I felt I lost with the high flowing K&N is back and then some (slightly) by going with the paper element. Right now I've got a Purolator paper filter, but may put AC Delco back in.

 

All the changes I noticed both good and bad have been slight. With all the power these V-8's have, it's difficult to sense changes by SOP.

 

I don't like to see low end torque loss since most of my driving is city and I rarely get to really open her up. I need all the help I can get with the 4.8L in stop and go traffic, even if it is slight. I would love to go to a dual exhaust, but am worried about loss of low end torque with increased flow. I can't afford to experiment with all the exhaust systems out there to find what suits me best. I traded in a 2000 Furd Ranger on this truck and with the Furd, I had a total of five different exhaust systems on it before I settled on a gibson system. It started to get expensive after awhile. Sorry to ramble on so.

[TxDoc]

I have been running my UPD with the K&N and drive mainly in town--ave speed is like 20 mph over 5,000 miles.  Getting 12's and when I went on a trip, all Interstate, got 14's.  

 

So, I decided to try the paper filter and stay with the UPD.  I am now getting over 14 in town.  This is only after about 25 miles, mind you,  but I am getting 14's---all city drving.

 

So.......I am not sure why. It does not make sense at the moment.

[02Blue]

Yep, still get best performance with UPD and Purolator paper filter.

 

I would get best gas mileage with stock filter housing, but I get improved SOP throttle response with the UPD housing. The K&N is long gone.

 

Which paper filter are you using Doc?

[Y2K Silverado]

I dicovered that a while back and have tried to pass it on. My truck doesn't like any of the high flow filters and I've tried a few. I too loose low end torque! I'm currently using the stock air box and lid, a Purolator filter and a DJ Motorsports intake tube. The air box has been modified with a ram-air set up which really does help. The only advantage I can see with a K&N filter is that they go forever, 50K between cleaning. I change air filters every 6K, and the $17 does add up. But I really don't care, clean air filters, oil filters and oil are cheap preventative maitenance in my opinion.  

Jim