High RPM Tuning Advice ?
Super Moderator
Joined: Oct 2007
Posts: 14,872
Likes: 764
From: Houston, Tx
Pump is a single LLY CP3 with the bigger orifice fittings done. Rail inlet fittings were upgraded with the PPE primary inlet and we swapped the larger factory primary over to the second side rail. Of course it has the bypass blocked off too.
On the turbo side it's fed with a short 4" tube and velocity stack, exits into 3" mandrel bent tubes, water to air cooler, and custom 3" intake. Recently added the intake and longer tubes, that pepped it up a good bit mid-range.
Haven't had a chance to check the drive pressure yet, but have a spare test port so guess I could take reading on that. Most people I've spoke with don't like that turbo, but it's what I have to work with for now. When I added the extra PW I didn't notice and knock, but I left the timing alone for the test. She did make a little more boost, maybe .5 or so before EGT's jumped to 1600 and I backed out.
Here is a screenshot of the data logged showing where she tops out right now on the 2000us tune. Also a video of 50% throttle run from last year.
-K
http://www.youtube.com/watch?v=dR3laaqKAjQ
On the turbo side it's fed with a short 4" tube and velocity stack, exits into 3" mandrel bent tubes, water to air cooler, and custom 3" intake. Recently added the intake and longer tubes, that pepped it up a good bit mid-range.
Haven't had a chance to check the drive pressure yet, but have a spare test port so guess I could take reading on that. Most people I've spoke with don't like that turbo, but it's what I have to work with for now. When I added the extra PW I didn't notice and knock, but I left the timing alone for the test. She did make a little more boost, maybe .5 or so before EGT's jumped to 1600 and I backed out.
Here is a screenshot of the data logged showing where she tops out right now on the 2000us tune. Also a video of 50% throttle run from last year.
-K
http://www.youtube.com/watch?v=dR3laaqKAjQ
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Diesel Fan
Joined: Aug 2012
Posts: 20
Likes: 0
The MAF unit is fairly new.. Any good tricks to calibrate a MAF tube shy of using a flow bench? Would help to know the true air flow in this situation wouldn't it? I know it reading low due to the larger 4" pipe dia alone, so the acceptable expected values are wide in the tune.
Hit a snag on drive pressure testing. A shifter linkage bolt broke off inside the drive and she spent all weekend stuck in FWD gear only. Something else to fix now.
On a fun note, dusted off my first twin engine 454 boat before the shifter broke. Makes all the hours of frustration worth while when you watch someone chase ya down for 10 miles eager to get a piece. Then once they topped around 75, rolled into the throttle and just pulled away...
Nobody ever believes a Duramax powered boat can run with the big dogs, until they see it in person.
-K
Hit a snag on drive pressure testing. A shifter linkage bolt broke off inside the drive and she spent all weekend stuck in FWD gear only. Something else to fix now.
On a fun note, dusted off my first twin engine 454 boat before the shifter broke. Makes all the hours of frustration worth while when you watch someone chase ya down for 10 miles eager to get a piece. Then once they topped around 75, rolled into the throttle and just pulled away...
Nobody ever believes a Duramax powered boat can run with the big dogs, until they see it in person.
-K
Super Moderator
Joined: Oct 2007
Posts: 14,872
Likes: 764
From: Houston, Tx
The MAF unit is fairly new.. Any good tricks to calibrate a MAF tube shy of using a flow bench? Would help to know the true air flow in this situation wouldn't it? I know it reading low due to the larger 4" pipe dia alone, so the acceptable expected values are wide in the tune.
Hit a snag on drive pressure testing. A shifter linkage bolt broke off inside the drive and she spent all weekend stuck in FWD gear only. Something else to fix now.
On a fun note, dusted off my first twin engine 454 boat before the shifter broke. Makes all the hours of frustration worth while when you watch someone chase ya down for 10 miles eager to get a piece. Then once they topped around 75, rolled into the throttle and just pulled away...
Nobody ever believes a Duramax powered boat can run with the big dogs, until they see it in person.
-K
Hit a snag on drive pressure testing. A shifter linkage bolt broke off inside the drive and she spent all weekend stuck in FWD gear only. Something else to fix now.
On a fun note, dusted off my first twin engine 454 boat before the shifter broke. Makes all the hours of frustration worth while when you watch someone chase ya down for 10 miles eager to get a piece. Then once they topped around 75, rolled into the throttle and just pulled away...
Nobody ever believes a Duramax powered boat can run with the big dogs, until they see it in person.
-K
