Tune Feedback 4.8 S475
Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
Tune Feedback 4.8 S475 My AFR used to be a steady 11.2-11.4, and now in the upper RPM ranges, it goes way fat. I've got a 1:1 regulator, so I thought I should gradually add fuel the higher the kpa, and the higher the rpm. Apparently, I went wrong somewhere. I'd love to hear some feedback, as well as logging information. I cannot seem to log airmass g/s correctly.
91 octane, no methanol. Trying to drop the boost down to ~15psi and running 14º now.
I'd appreciate your advice guys!!!
91 octane, no methanol. Trying to drop the boost down to ~15psi and running 14º now.
I'd appreciate your advice guys!!!
Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
Looks like it starts dumping fuel above 6400, to the point it's in the 10.6-10.8 range at 7000 rpm. I've got comp 918 springs in it. Still feels like it's pulling hard up top, but going pig rich in the process.
I’m not very familiar with HP tuners. But if you command the fuel lower and the engine doesn’t respond I’d look at the valve train.
Those are a pretty weak spring to be turning to 7k IMO, especially if they aren’t shimmed. I get the cam is mild, but it’s also not designed to work well past 6500 or so. Might try shimming those springs up.
With the .525 lift on an LS6 cam you aren’t close to the .625 max lift open pressure rating on those springs. So instead of the rated open pressures of 367lbs you’ll be at much less with .525 lift. Might be something to look into anyway. Being .10 under the rated lift of a spring is a ton.
Good luck!
Those are a pretty weak spring to be turning to 7k IMO, especially if they aren’t shimmed. I get the cam is mild, but it’s also not designed to work well past 6500 or so. Might try shimming those springs up.
With the .525 lift on an LS6 cam you aren’t close to the .625 max lift open pressure rating on those springs. So instead of the rated open pressures of 367lbs you’ll be at much less with .525 lift. Might be something to look into anyway. Being .10 under the rated lift of a spring is a ton.
Good luck!
Did you just add the methanol? Could be going rich as it gets kicked on. I would atleast swap to PAC single springs since comp 918's are known to fail. I would try pulling 2-3% out of the VE table in that area see what if it will lean out.
Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
I’m not very familiar with HP tuners. But if you command the fuel lower and the engine doesn’t respond I’d look at the valve train.
Those are a pretty weak spring to be turning to 7k IMO, especially if they aren’t shimmed. I get the cam is mild, but it’s also not designed to work well past 6500 or so. Might try shimming those springs up.
With the .525 lift on an LS6 cam you aren’t close to the .625 max lift open pressure rating on those springs. So instead of the rated open pressures of 367lbs you’ll be at much less with .525 lift. Might be something to look into anyway. Being .10 under the rated lift of a spring is a ton.
Good luck!
Those are a pretty weak spring to be turning to 7k IMO, especially if they aren’t shimmed. I get the cam is mild, but it’s also not designed to work well past 6500 or so. Might try shimming those springs up.
With the .525 lift on an LS6 cam you aren’t close to the .625 max lift open pressure rating on those springs. So instead of the rated open pressures of 367lbs you’ll be at much less with .525 lift. Might be something to look into anyway. Being .10 under the rated lift of a spring is a ton.
Good luck!
I'm not sure why my commanded AFR is diving into the 10s is what's strange. I'm still 'new' to tuning, and hoped someone would look at the hpt file and log and say WTF are you doing this for? LOL
I appreciate everyone's help so far. I really do.
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