I did my idle to 20psi run in 4 hi.
**CHALLENGE** - TURBO LAG TEST using a log
- Thread starter coker6303
- Start date
I think 4 hi in 5th would be ok. You are going to have more drivetrain loss but you can ride the brake to 50 mph...........mahaha
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If work is dead again today I'll ditch out and go do a 5th gear pull.
:thumb: science is cool...
What truly matters is the amount of oxygen reaching cylinders. Pressure is caused by resistance, and boost pressure is roughly proportional to volumetric flow divided by cross sectional area it flows through.
Assuming the temperatures are identical and starting environmentals are identical, resistance is resistance and 20psi with each charger is the same. If the temperatures through the system are not identical, 20psi means two different chargers have identical volumetric flow but whichever yields lower outlet temperatures has a higher mass flow for that volume and will push more oxygen into the engine.
Basically if the post-intercooler temps are the same across different setups then JoshH is right and 20psi is all the same.
This is a good test
long story short, from what I can gather from IAT and IAT2 (at filter and then Y bridge) under throttle holding 20psi total boost and steadily accelerating I only see a max of 20-25F increase in temp through the turbo system.
Waiting to see the results of the same test through a stock turbo to see if there is more heat introduced into the system at the low boost levels.
Waiting to see the results of the same test through a stock turbo to see if there is more heat introduced into the system at the low boost levels.
I would be all over this like white on rice on a white paper plate in a snow storm but..............Its winter time here and my truck is a fair weather truck. Never seen salt and never will under my ownership. You can still eat off the frame of it! Still has 51,000 miles on it lol.
I wish my truck was a sissy! Lol. I understand, no prob.
Is there anyone else willing to do a few logs?
Is there anyone else willing to do a few logs?
I'll re-log with iat pids to see what the temperature fluctuation is on my stock charger 0-20 psi run.
I will do a 4094 stock injector log this week
Very True. Extremely tough when using twins. Different radius bends in the piping, different diameter, length of the tubing. It's best guess even for stock piping when changing turbo's.
Has anyone checked the times to spool to 20psi on a stock turbo? With stock tuning? For a baseline ref?
Not sure about stock tune, that's a good point. Maybe Josh can knock that out when he gets a second
I can put a stock tune in it and test it, but with the intake, exhaust, and EGR delete, I'm not sure how accurate it would be to a totally stock truck. Here's what my truck does with a hot street tune, probably in the 475 hp range, runs low 13s. My truck is 7200 lbs, 285/55R20 tires (about 32" tall), 1058 converter.
Here are my numbers:
Zero boost off idle 20 psi: 2.400 seconds, 683-3292 rpm, 0-25 mph. It really starts to light at about 1600 rpm.
1500 rpm locked in 5th to 20 psi: 2.848 seconds, 1496-1730 rpm, 52-60 mph. Boost and rpm don't even really do anything for the first half second.
Locked in 5th at 60 mph to 20 psi: 1.851 seconds, 1754-1936 rpm, 60-66 mph. Boost starts to climb after about .3 seconds.
Locked in 4th at 60 mph to 20 psi: .801 seconds, 2483-2602 rpm, 60-64 mph. Boost doesn't really start moving until about .3 seconds like above, but once it starts, it really takes off instead of the gradual climb like the other tests.
Here are my numbers:
Zero boost off idle 20 psi: 2.400 seconds, 683-3292 rpm, 0-25 mph. It really starts to light at about 1600 rpm.
1500 rpm locked in 5th to 20 psi: 2.848 seconds, 1496-1730 rpm, 52-60 mph. Boost and rpm don't even really do anything for the first half second.
Locked in 5th at 60 mph to 20 psi: 1.851 seconds, 1754-1936 rpm, 60-66 mph. Boost starts to climb after about .3 seconds.
Locked in 4th at 60 mph to 20 psi: .801 seconds, 2483-2602 rpm, 60-64 mph. Boost doesn't really start moving until about .3 seconds like above, but once it starts, it really takes off instead of the gradual climb like the other tests.
Good info! That's for adding the other runs for comparison :thumb:
Any maf and iat numbers please?
Thanks for taking the time out to do the test josh.
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Thanks for taking the time out to do the test josh.
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In it for good info
can I post a log from a autocal? I didnt tune the truck and dont want to post the log if it reveals to much about the tuning. dont want to make the tuner mad.
I've never done a log from an autocal, but if you use the v7 software with it then you can select the PID list to only reveal what you need for the log :thumb:
ok cool. I will give that a shot, hope it works thanks
I don't have IAT2 in my PID list any longer. Its not in EFI Scan and Tune BBL. If anyone has the computer code for me to put in the Options file I will log it too.
I did some logs the other day and I was logging Converter Duty Cycle (if thats the right one?) and never could get it to read over 65% from what I saw on the screen of my V2. Built trans in TH, M, and 5th gear.
I did some logs the other day and I was logging Converter Duty Cycle (if thats the right one?) and never could get it to read over 65% from what I saw on the screen of my V2. Built trans in TH, M, and 5th gear.
Did you pick the lb7/lly data set or the lbz set?
I am sort of a rookie with data logging because I like the tech 2.
I am sort of a rookie with data logging because I like the tech 2.