6.2L (L9H) Owners - Get all your questions answered here

11Silvy · July 8, 2012

I bet once you put on some 18's or 17's it will really haul ass^ my 22's are like boat anchors but they look good. I have a set of Z71 18" oem wheels and tires I put on, it feel like I gained 20-30 hp over the 22's lol.

PDYoung · July 9, 2012

Those Callaway's look sweet,i don't know how i missed reading about those,but i'm on it now.I haven't been to a Chevy dealer in a while, i bought my 6.2 Sierra off of ebay from a guy an hour and a half away,which wasn't bad.I'm new to the GM 6.2 trucks, i had an 2003 Suburban with a 5.3 that gave me a lot of problems that i bought new in 03.I was in the market for a 2013 GT Mustang that i was going to supercharge,but seeing the Edelbrock E-Force supercharger commercial for the 6.2 GM motor on Speed Channel or Velocity changed my mind and two days later i located my truck on Ebay.

Day two on supercharger install, again very brutal because of the temperature and humidity.Another seven hours takes me from step 33 to step 62.Supercharger/Manifold is on and torque down,most of the bolts were a bear to get to and torque,took swiviles,extensions,ratchets,tools all over the place,but got it on and torqued.Fuel rails with the stock injectors are also on,new o-rings to fit blower manifold were supplied and swaped on to stock injectors.Now i have a problem.I didn't number the injector plugs so i don't know which wires go to which injectors on the drivers side.Can somebody take a picture of theirs and post it so i can get a look? The altenator electric plug( it has orange plastic on the weather pack connection) and an injector are on one of the harness wires and the EVAP plug( it has blue plastic on weather pack connection) and another injector are on another part of the harness next to each other,just dont know which is injectors are number one and four on drivers side.If someone could post a picture of theirs it would be greatly appreciated.This is hard work for my old body,but it will be worth it and thanks for the four wheel auto tip

Edited July 9, 2012 by PDYoung

PDYoung · July 9, 2012

AaronIROCZ is correct. The Iowa Callaway dealer is Karl Chevrolet. I believe they are also the dealer for Minnesota as well. Right now they have a red 540, a white 540 and two black 540's, one 2011 and one 2012. They also have an SC450 Avalanche in stock.

It does pretty well on the street. When you're done you'll find that 4wd auto is you best friend. You won't be able to hook up in 2wd. I've got 305/40 ZR22 BF Goodrich G Force T/A's and can't hook up in 2wd. You will love the launch in 4wd, it's a neck snapper...

How tall are your 22's .Do you know if they are as tall as my 17 inch stock wheel and tire combo? What axle ratio do you have? Edited July 9, 2012 by PDYoung

SILVERADOSC540 · July 9, 2012

The tires that I have are 305/40 ZR22's, which comes out at 31.6" tall. Not sure what tires you have, but the conversion is easy. I took my width of 305 millimeters, converted to inches on my cell phone(12.01 inches) times the height plus 22 inches. The height is the number after the width(in red) and is the percentage of sidewall compared to the width. So- in my case it is 12.01 inches times .4(40 percent) equals4.804 inches, times 2(above and below rim) equals 9.608 inches, plus the rim size of 22" for a total of 31.608 inches. As for my gear ratio I have 3.73 gears. Not as aggressive as the 4.10's I had in my VortecMax, and not as highway friendly as the 3.42's that a lot of GM trucks have. I believe the NHT option code (max trailering pack) is standard with 3.73 gears, so you may be running the same. Sorry I can't help with the injector pics, I'd likely break one of those covers I have trying to remove it. Run over to your nearest dealership and take a look at one on the lot...

Good luck- pics when you're done!

trixster8 · July 9, 2012

Those Callaway's look sweet,i don't know how i missed reading about those,but i'm on it now.I haven't been to a Chevy dealer in a while, i bought my 6.2 Sierra off of ebay from a guy an hour and a half away,which wasn't bad.I'm new to the GM 6.2 trucks, i had an 2003 Suburban with a 5.3 that gave me a lot of problems that i bought new in 03.I was in the market for a 2013 GT Mustang that i was going to supercharge,but seeing the Edelbrock E-Force supercharger commercial for the 6.2 GM motor on Speed Channel or Velocity changed my mind and two days later i located my truck on Ebay.

Day two on supercharger install, again very brutal because of the temperature and humidity.Another seven hours takes me from step 33 to step 62.Supercharger/Manifold is on and torque down,most of the bolts were a bear to get to and torque,took swiviles,extensions,ratchets,tools all over the place,but got it on and torqued.Fuel rails with the stock injectors are also on,new o-rings to fit blower manifold were supplied and swaped on to stock injectors.Now i have a problem.I didn't number the injector plugs so i don't know which wires go to which injectors on the drivers side.Can somebody take a picture of theirs and post it so i can get a look? The altenator electric plug( it has orange plastic on the weather pack connection) and an injector are on one of the harness wires and the EVAP plug( it has blue plastic on weather pack connection) and another injector are on another part of the harness next to each other,just dont know which is injectors are number one and four on drivers side.If someone could post a picture of theirs it would be greatly appreciated.This is hard work for my old body,but it will be worth it and thanks for the four wheel auto tip

Does this help?

PDYoung · July 10, 2012

Those Callaway's look sweet,i don't know how i missed reading about those,but i'm on it now.I haven't been to a Chevy dealer in a while, i bought my 6.2 Sierra off of ebay from a guy an hour and a half away,which wasn't bad.I'm new to the GM 6.2 trucks, i had an 2003 Suburban with a 5.3 that gave me a lot of problems that i bought new in 03.I was in the market for a 2013 GT Mustang that i was going to supercharge,but seeing the Edelbrock E-Force supercharger commercial for the 6.2 GM motor on Speed Channel or Velocity changed my mind and two days later i located my truck on Ebay.

Day two on supercharger install, again very brutal because of the temperature and humidity.Another seven hours takes me from step 33 to step 62.Supercharger/Manifold is on and torque down,most of the bolts were a bear to get to and torque,took swiviles,extensions,ratchets,tools all over the place,but got it on and torqued.Fuel rails with the stock injectors are also on,new o-rings to fit blower manifold were supplied and swaped on to stock injectors.Now i have a problem.I didn't number the injector plugs so i don't know which wires go to which injectors on the drivers side.Can somebody take a picture of theirs and post it so i can get a look? The altenator electric plug( it has orange plastic on the weather pack connection) and an injector are on one of the harness wires and the EVAP plug( it has blue plastic on weather pack connection) and another injector are on another part of the harness next to each other,just dont know which is injectors are number one and four on drivers side.If someone could post a picture of theirs it would be greatly appreciated.This is hard work for my old body,but it will be worth it and thanks for the four wheel auto tip

Does this help?

Great picture of exactly what i needed.Thanks so much.

PDYoung · July 10, 2012

Thanks SilveradoSC540 for the tire conversion math.I do also have the same 3:73 rear gear.Since we have the same gear ratio's the overall tire/wheel height would affect the acceleration of our trucks if they are different.I'll have to do the math on my tires to see what i have.Correct me please if i'm wrong,but won't a shorter wheel/tire take off quicker?

Thanks also to trixter8 for that shot of the drivers side wiring.I used it with some back up information i found last night while researching GM Truck Wiring.I found wiring schematics showing the injector wire color code that i used to double check,all injectors are now correctly hooked up.

Day three of supercharger install went pretty good until i got to putting on the serpentine belt.The belt Edelbrock supplied is 117.5 inches long.I need at least another inch or so.I waited for a call back from Edelbrock Tech Line on this one and i never got it. .Auto parts store was almost closed by the time i got to the belt situation.After this belt install, there is one more wiring harness to run for intercooler pump.The pump relay is suppose to be attached to a stud on the fire wall that will be the ground for the pump and it is for the relay to be mounted to,but it's not there on my truck.Some trucks have relays mounted to the firewall and some don't.I'll just ground it to some other spot and mount relay near by,not really a problem,just saying directions are good,but not exact.May not be able to get back to the install until Wednesday.I will keep everybody posted,it won't be long now.Also there is a tune update already i have to download from Edelbrock and install.I already installed the tune that came with the kit when i got it, and the kit for these 6.2 L9H truck motors was just released,i got one of the first ones.The tunes that they provide are 50 state compliant tunes,so on the conservative side.I'll get a custom tune from the local speed shop after i drive around a little while with the supplied tune.

Edited July 10, 2012 by PDYoung

SILVERADOSC540 · July 10, 2012

PDYoung, you are correct in the smaller tire equals a better launch. You have less mass to get moving, so you should get moving in a hurry. The taller tire should catch up in the upper rpm range, because at the same rpm the taller tire would be moving a greater distance. Sounds like you're getting close on the install. I too have a conservative tune from Callaway, but with my 5 year 100,000 mile factory warranty still valid I don't dare mess with it. I've considered an Auto Cal from BlackBear, which would allow me to store the Callaway tune, put in a custom tune from Justin, and reload the Callaway tune for any service visits, but for now it's plenty quick so I'll leave well enough alone. Keep us posted!

PDYoung · July 11, 2012

Install of supercharger finished,truck started right up,no check engine lights,no leaks.I blasted out 50 miles for a shake down run.Nothing bad to report,everything working great.It is now,scarey fast.I'm going to try and put a picture up and i have short video from my phone that i will try to post.

Edited July 11, 2012 by PDYoung

11Silvy · July 11, 2012

Install of supercharger finished,truck started right up,no check engine lights,no leaks.I blasted out 50 miles for a shake down run.Nothing bad to report,everything working great.It is now,scarey fast.I'm going to try and put a picture up and i have short video from my phone that i will try to post.

Awsome, in for the video!

PDYoung · July 11, 2012

Install of supercharger finished,truck started right up,no check engine lights,no leaks.I blasted out 50 miles for a shake down run.Nothing bad to report,everything working great.It is now,scarey fast.I'm going to try and put a picture up and i have short video from my phone that i will try to post.

PDYoung · July 11, 2012

Those Callaway's look sweet,i don't know how i missed reading about those,but i'm on it now.I haven't been to a Chevy dealer in a while, i bought my 6.2 Sierra off of ebay from a guy an hour and a half away,which wasn't bad.I'm new to the GM 6.2 trucks, i had an 2003 Suburban with a 5.3 that gave me a lot of problems that i bought new in 03.I was in the market for a 2013 GT Mustang that i was going to supercharge,but seeing the Edelbrock E-Force supercharger commercial for the 6.2 GM motor on Speed Channel or Velocity changed my mind and two days later i located my truck on Ebay.

Day two on supercharger install, again very brutal because of the temperature and humidity.Another seven hours takes me from step 33 to step 62.Supercharger/Manifold is on and torque down,most of the bolts were a bear to get to and torque,took swiviles,extensions,ratchets,tools all over the place,but got it on and torqued.Fuel rails with the stock injectors are also on,new o-rings to fit blower manifold were supplied and swaped on to stock injectors.Now i have a problem.I didn't number the injector plugs so i don't know which wires go to which injectors on the drivers side.Can somebody take a picture of theirs and post it so i can get a look? The altenator electric plug( it has orange plastic on the weather pack connection) and an injector are on one of the harness wires and the EVAP plug( it has blue plastic on weather pack connection) and another injector are on another part of the harness next to each other,just dont know which is injectors are number one and four on drivers side.If someone could post a picture of theirs it would be greatly appreciated.This is hard work for my old body,but it will be worth it and thanks for the four wheel auto tip

Does this help?

trixter8 how did you get this picture on here?Is it coming from paint? I've tried everything and i can't post any pictures.I copy a picture from my pictures file,but the paste option is gone when i get to this forum.What am i doing wrong?

PDYoung · July 11, 2012

Install of supercharger finished,truck started right up,no check engine lights,no leaks.I blasted out 50 miles for a shake down run.Nothing bad to report,everything working great.It is now,scarey fast.I'm going to try and put a picture up and i have short video from my phone that i will try to post.

I can install a supercharger,but i can't figure out how to put a picture up.I need step by step instuctions or i'm lost.

trixster8 · July 11, 2012

Install of supercharger finished,truck started right up,no check engine lights,no leaks.I blasted out 50 miles for a shake down run.Nothing bad to report,everything working great.It is now,scarey fast.I'm going to try and put a picture up and i have short video from my phone that i will try to post.

I can install a supercharger,but i can't figure out how to put a picture up.I need step by step instuctions or i'm lost.

I uploaded the image to my photobucket account, then pasted the image link on here.

PDYoung · July 15, 2012

The tires that I have are 305/40 ZR22's, which comes out at 31.6" tall. Not sure what tires you have, but the conversion is easy. I took my width of 305 millimeters, converted to inches on my cell phone(12.01 inches) times the height plus 22 inches. The height is the number after the width(in red) and is the percentage of sidewall compared to the width. So- in my case it is 12.01 inches times .4(40 percent) equals4.804 inches, times 2(above and below rim) equals 9.608 inches, plus the rim size of 22" for a total of 31.608 inches. As for my gear ratio I have 3.73 gears. Not as aggressive as the 4.10's I had in my VortecMax, and not as highway friendly as the 3.42's that a lot of GM trucks have. I believe the NHT option code (max trailering pack) is standard with 3.73 gears, so you may be running the same. Sorry I can't help with the injector pics, I'd likely break one of those covers I have trying to remove it. Run over to your nearest dealership and take a look at one on the lot... Good luck- pics when you're done!

Hey Jonathan how are you doing? Does your Callaway have a boost gauge?If yes how many pounds of boost does your motor make?Also does your truck have headers?I like my supercharger,but i feel like i want just a little more and i was going to add headers,but i'm being told that the stock manifolds are ok for my 7lbs of boost with stock cam and heads.I'm going to get a boost gauge so i can see if i'm at least getting 7lbs.Also n a couple of weeks i'm going to get a custom tune done.I'm a little scared to do it,i'm afraid their going to lean me out too much or up my timing too much and fry my motor,but i know Edelbrock's tune is real conserative.