2018 Callaway Silverado build.
I've decided to take my Callaway a bit further. Nothing too extreme yet, but probably close to the limits of fuel and transmission.
My plan for the first round of mods is: e85 Throttle body Smaller pulley Headers Dyno tune My Callaway blower is based off of the tvs 2300 rotor pack, and currently has about a 3.5" pulley on it. The C7 SC757 runs the same blower with a 2.6ish pulley on their 6.2, so I should have room to grow. I need to learn the major differences between the L86 and LT4. I would appreciate any advice or opinions as this is my first venture into modding the DI engines. Am I going to require fuel mods with this plan, or will the stock system. Support this level? |
Pic of my truck:
https://cimg6.ibsrv.net/gimg/www.per...37113afa3.jpeg |
is your truck flex fuel? i am thinking not.
that will require some fuel mods. someone will be along to give better idea on what. (at a min. a flex fuel sensor){i think cjtunes sell a kit} 12# boost is the "rule of thumb" max boost before you might be on borrowed time... that is when its time to think about upgrading the pistons & the powdered metal rods. you should be about 6# now based on how my burb came from them. though i only have the 5.3 & 1900 (came w/ a 3.4 pulley) ... if so, a 3.0 pulley should be in 11# neighborhood. then LT headers should drop you down ~2# so back to 9-9.5# *look at the rear lip of your pulley for the part # & size. ;) hopefully your tuner is good... as that is what will help your trans last longer. * you will also want to think about an upgraded driveshaft |
boost #s above are for pump gas (93).
oh & good looking truck :cheers: good to see they got you the quality rims vs the ones i got eta: you may need to think about injectors too not to mention 1 step colder spark plugs while you are here, might as well change out plug wires & add sleeves to protect from LTs ;) & look at pinning the crank pulley |
Thanks! I did order the flex fuel parts, they arrived last week. Pretty simple addition, then it will need turned on in the tune, of course.
Awesome to hear that you have a Callaway as well, I never run into anyone else. I'm not excited to hear that the bottom end gets weak at 12#, what average rwhp would that be on these motors? I am curious about the fuel system though. E85 may require upgrades for volume, but I know the current tune is pig rich. |
my chevy dealer sold quite a few tahoes but only the 1 burb that i know of.
everyone seems to want the shorter wheelbase lol its expensive, but keeps the warranty ;) mine sat on lot for a year, so i got a sweet discount like i said that the rule of thumb.... i think some peeps here are running maybe 14# a lot of it is in the tuning i want to say that will be in the 650-700ish rwhp neighborhood |
i have read peeps talking about using LT4 or {LT4+30%} injectors & LT4 hpfp
tie that in w/ a cam that has a larger fuel lobe ;) next weak links will be torque converter & diff |
LT4 have bigger injectors and a bigger HPFP. I would think just from what I read on here is your would need a cam with a 32% over fuel lobe and LT4 injectors to run E85. Some will say you need both of those plus LT4 HPFP.
https://www.performancetrucks.net/fo...denali-556039/ https://www.performancetrucks.net/fo...harger-554074/ https://www.performancetrucks.net/fo...-555840/page2/ Here are some other threads to look over. |
Hey gat0r I'm 90 % sure the crank is keyed on LT's. That's what I came up with few years ago but have never actually seen.
OP I've seen a couple L86's go into the high 600's but they backed off because of ring lands to 600-620 for longevity. After pretty exhaustive research in the past week I'm comfortable that the LT4 injectors, pump and fuel lobe will manage 700 np on E85 with blower ~ 100 more with turbo with an upgraded low side (800- $1000). If you want more fuel than that it's either meth or port injection kit for $4900. Lt1 Hpfp would be good for ~ 600 on E85. If you're doing the cam there are drop in piston/rod combos that will do 1000whp np. Nice build! |
The crank is keyed, it was on mine.
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