What kind of boost are you seeing in stock trim. By high altitude, I'm talking above 3800 ft. Places like Albuqerque, NM or Denver, CO.

Just curious to see if the boost drops off the higher you go in altitude.

THanks

 

I don't live in a high altitude area, but race in one. If I go from the LA area up to the high desert to LA County Raceway, I lose 1-1.5 lbs of boost, depending one the temp.

The incoming air is less dense, so the outgoing (from the blower into the engine) is also. The fix is to spin the blower faster with a larger bottom pulley.

If you have a chip with raised shift points, and a larger pulley, the blower is spinning mucho fast. You may want reduce themthese shift points

The safe limit for the blower is supposed to be somewhere around 14,000 RPM, but this is debatable. Some guys are spinning considerable faster.

 

I live at 6200-6300 feet and bone stock my boost guage would only hit 6-7 psi. After the air filter kit and chip I can now see as high as 9-9.5 on the boost guage. I have my psp pulley sitting right here next to the computer and am not sure when I can put it on. I am leaving in a few days for like 10 days and so I don't know if I can get it on before I leave.

I should be seeing around 11.5-12.5 after the pulley.

I have not been in lower altitudes with the L yet so I cannot comment as to whether the guage would read higher or not.

Hope that answers your questions.
Paul

 

dont know about u guys. but my L will boost @ 10 psi stock where i live

 

I'm curious about this too. I'm moving to Colorado Springs, CO next month and I'm sending my chip back to get reburned. I don't even know if there are any tracks around the area. I'm just wondering how much my 1/4 mile times will suffer if I do find a track.

Bill
Silver 2001 Lightning
13.18 @ 105.9
JL Diablo chip
PSP lower pulley
JL ram air (not tested at the track yet)

 

I don't think actual boost pressure (relative to ambient) will change, but since the air is less dense-less O2, you lose horsies. I've run at Bandimere in Denver and best run was at 14.90, stock, which is consistant with all the other gen II L's I've seen run there that are relatively stock. Bandimere is at 6000'. I'm sure I'd be about 1.3 to 1.5 seconds faster near to sea level.
Kent

 

Boost _will_ change with altitude.

Since doing a chip, and open air filter, my boost gauge maxes out at 10lbs (right at redline) starts at 8lbs and works its way up. I'm at ~4300 ft. Alamogordo, NM.

 

I've lived in both the SF Bay area of California and in Denver, CO and driven my truck both places. There's a tremendous difference. You'll notice that you'll make less boost (not too much less, 1-1.5#), but also that you'll make it more slowly. I've driven a number of L's up there and they are all affected a little differently so hopefully yours is one of the ones that doesn't lose so much. If you're moving from a low altitude area I think that you are going to be disappointed....

-W