Something definately isnt rite with the truck, you should definately be deep in the 12's with your setup. I would definately look into the FPR or even the CP3. How many miles on on your truck?
Question: Running the lly at the track tonight.
- Thread starter Devon
- Start date
93,000 miles.. I don't really think its the cp3 because a similar issue was going on with my 06lly and I did the injection pump and didn't change a thing! Maybe it's a little weak, but I havnt thrown any low rail pressure codes so the difference in desired as actual can be all that much I would think. I do know for sure my truck needs a fpr. Would that effect rail pressure wot?
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I run with my ac on
Track officials must love you
Just wanted to say, between it being about 55 ambient and about 90 ambient it ususally sets me back about .5-1.5mph
Typically around 34-35 psi, didn't notice in overdrive. I'll do a few runs and let you know
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That should be enough, what kinda pulse do you run and whats the actual rail pressure look like? Whats your convertor slip look like?
Are you on a stock turbo? How are you at 34-35 PSI? I only get to 22 PSI max. I have a 04.5 LLY also.
Sorry for off topic, but what does your vane position look like?
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Depends on RPM, I have to effectively use the max tables to limit it becuase the MAP can't read high enough to run off desired boost.
It's been a while since I logged it too... but according to the table should run from 40 down to about 14 from 2600-3250
My boost is real similar to beech's. I dont know what he has for tuning, but tony tuned my truck. I'm really happy with how smooth and linear the power is and boost and what not. When we were driving it after he tuned my truck it pulled like a mad man! But as my fpr started to get worst in the last couple weeks. It hasn't been performing like it should. Trucks loping like crazy now at idle and even at slower speeds. Wasn't ever sure on if it has an effect on rail at WOT? I have a lbz regulator on the way thanks to another dd member! Hopefully it's only the fpr!
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Yea a wonkey FPR can do some weird stuff. You're in good hands with tony so I wouldn't worry about the tuning. You could always log the rail pressure to see what its looking like.
Yeah I hear ya man, I'm going to start by doing the fpr this weekend, then make sure the race valve is on nice as tight. I'll post a picture of the runs I ran this last Wednesday. You guys can see.
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With pretty much that same setup with robs tunes I went 13.1@103. So yeah its a bit slower than it should be. My 60's weren't as good either, I could only cut high 1.8's. That's in kansas at 1000 feet or so. With the s475 I didn't improve that much which pissed me off but I had some issues my best 1/8th was a 7.7 and that yielded a 12.92@ 104. I didnt hit 5th gear until 102. So it will do better when I get my shift points taken care of. Sorry got a bit off topic.
When I had my 07 RCSB 4wd with 5.3 and sts I ran 8.21 in 88 deg and 7.64 in 44 deg....a hell of a difference for sure with no changes whatsoever. My tune must've been rich huh? Haven't ran my LMM yet.
