ok guys i intstall my pi vig 2600 triple disc and wondering if its better to go more boost than timing, like i was before, i was at 13psi with 12*'s of timing, or should i stay at 9lbs and 18*'s of timing, i know the way im at now it's safe, but wanna jump into the 12's

 

Parish has this info.... But I believe more boost less timming...

 

cuz before when i ran stock stall in washington state with the 2.75pulley@10lbs and 13*'s of timing ran a 12.79@ 105mph with 60ft@1.88, and then installed the tbstall 2600 with sdtune, meth injection, 2.75pulley@13psi @12*'s of timing, here in texas ran a 13.59@96mph 60ft@1.84, then switched out the stall back to stock and put the 3.1pulley@9psi and 18*'s of timing and ran a 13.19@102mph 60ft@1.87, now have the pi 2600, cuz the tbstall wasnt just working with the radix, and wondering if i would of have the 2.75pulley@13psi and 12*'s of timing would of been better on times

 

My brother's Procharged truck likes less boost and more timing here in NC...

 

Less boost more timing for me works better. I am at about 6lbs of boost and 16.7* of timing and she runs great!

 

are you guys factoring in what your IAT Advance(timing being pulled due to IAT temps) is by the end of the run. I mean, washington state and no real heat and then texas and its lovely warm and cozy air. A 2.75 pulley on a radix is screaming high IAT's at the end of the run. I see ya have meth, but still wondering what the IAT's are. In the winter I run no meth and ran my best times.

 

My IAT table starts pulling timing at 95*, and in .50* increments. I have my total timing set around 17*, but i never see all of that due to other variables in the tune. With my new I/C setup, its been hard for me to even see triple digit IATs, so I am going to have to wait for warmer temps to do any real IAT testing. For the record though, I have an extremely aggressive IAT spark table, but I feel safer with it like that.

 

that's fine, there's a ton of ways to tackle the scenario, me personally give me what it will take and pull as it would get kr. I am good w/the IAT table taking alot of testing. But that's my point, is he just really complaining about heat. (no suprise with a 2.75)

 

i had a post awhile back with some testing. i made a pile of gtech runs in one night. seems like i went from 10 to about 19deg of timing and 9 to about 14psi. at each boost level i added timing to the edge of knock. tuning to the edge of knock it made significantly more power with the high boost and lower timing than the other way around. i am sure there are limits to this and i didn't try every senaro like 20psi and 0deg of timing or anything like that.

your ability to easily adjust boost and the capasity of your compresor may effect how much boost you can run. if your geting out of the eff range of your compresor then your not going to benifit from running more boost and less timing. also the capasity of your intercooler will start to effect things at some point. my set up was a good sized turbo and a good intercooler. i dont think i was pushing the limit of either and could have gone higher boost with even less timing than i did. i wish i had tried that.

let me see if i can find the original post.

 

i can't find that original post. i did find some refrences to it. looks like i only tried from 9 to 11psi and from 10 to 14deg of timing. 9psi at 14deg was less hp than 11psi at 10deg. seems like it was ~20hp more