3800 Stock TB

mybluegtp

TCG Elite Member
Nov 9, 2008
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Burbank
Ron maybe the 99 will work, I was autotapping the car and according to J/O my Ltrims where high at Idle I was seeing 14 and when driving I was seeing as low as 3 but my strims where reaching in the negetives so I think that is my problem when trying to floor it and then my car tends to studder.... I think you said that you were not going to the mod day so if I dont get it from bummpin then I'll hit you up. thanks :)
 
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imported_Ron Vogel

Guest
I am going to the mod day, but have to leave by 12-12:30. I'll clean the thing up and bring it with just in case. LT's should be a little higher on a ported TB, but 14 is way too high. If you want to swap, I'll play with it a little. There is a few factors with the LT's that affect it, if you have a 3.25 or smaller pulley, with no head work it's really difficult to pull good LT's on the bottom. I can get them to 0 at idle, but it sacrifices top end fueling and goes lean up top, and visa versa. On a 3.4 pulley car the trims float around 3-5% on a ported TB that's balanced. 14 still leaves some adjustment, but I don't like to see more than 10, so there's more of a cushion. With a 72mm ported I'm seeing about 7-9% trims on a 3.25, and 11-13% on a 3.0. The mini-afc set at 105% brings me down to 3% LT's on a 3.0 pulley, but it's a fight with the small pulley. The boost bypass backs up the intake and the LT's get screwy with the smaller pulleys, so it's hard to discern what's good fueling and what's a scewed reading. I did pick up some new tricks to combat this though. I'm trying to finish it up for the mod day, but I got some pretty funky looking TB I'm working on that has no maf in it at all. The front is lopped off, and a machined stainless stack is attached to the horn. It's made to transition from 4" to 72mm, plus the whole thing is smoothed and chrome. But we'll see if that happens, I still have 3 TB's to get done before MGM, plus this one, and my wife's got me doing a bunch of crap to the house because we have family coming into town for my son's baptism this weekend.
 
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imported_Ron Vogel

Guest
I don't even watch ST's, they bounce around too much. LT's just give you an average of what the car is adding or removing fuel wise (through the ST's) to keep 02's where they should be. O2's are the ultimate thing to watch, but the Lt's are a good tuning tool. As long as Lt's stay within a certain range (-22 to 16.4+) the computer has room to change 02's to where they need to be. I understand it better than I can explain it though.
 
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