Supercharger/procharger options for 2015 sierra 5.3

15GMCALLTERRIAN · November 19, 2020

Looking for a supercharger /procharger to just add a little more power and keep the drivability and smog working normal. I want to push it to almost the limit but still pass smog with cats on. Notnlooking to race but looking to have some power on tap really just Looking for input on bolt on kits and ive been leaning procharger kits that work my concern is smog . I dont mind adding more fuel or flex fuel id actually prefer to convert to flex instead of being limited to 91 but if 91 is the most simple to pass smog thats what ill do. Open to suggestions i like procharger sounds but whipple is fine too .Truck has 5.3 80k and only mod is CAI.

some questions i have forbthose who have procharged or supercharged

1.was the DOD eliminated?

2.can you covert to e85/flex and whats needed

3.with flex is fuel tapped out on injector/pump

4.what would compromise my smog passing abilities

5. tuner or full kit?id prefer tonhave my own tuner to squeeze more out but is it worth it

Edited November 20, 2020 by 15GMCALLTERRIAN

gat0r · November 22, 2020

what state are you located in? as that will let others really weigh on on smog concerns.

if you are in unfriendly state, you will have more hoops to jump through.

also do you want power throughout rpm range or more towards upper end?

if upper end, i hear procharger is best for that.

if you want full range, look towards whipple or magnuson or LSA

i have a magnuson 1900. started w/ their tune. then upgraded to Blackbear tune (BBP).

i had DOD disabled by BBP

cant speak to e85/flex fuel, but someone else can weigh in.

i have no issues passing my states emission test.

lots of users here seem to be happy w/ BBP or HP tuners

gat0r · November 22, 2020

fyi,

M1ck3y · November 22, 2020

On 11/19/2020 at 12:56 PM, 15GMCALLTERRIAN said:

Looking for a supercharger /procharger to just add a little more power and keep the drivability and smog working normal. I want to push it to almost the limit but still pass smog with cats on. Notnlooking to race but looking to have some power on tap really just Looking for input on bolt on kits and ive been leaning procharger kits that work my concern is smog . I dont mind adding more fuel or flex fuel id actually prefer to convert to flex instead of being limited to 91 but if 91 is the most simple to pass smog thats what ill do. Open to suggestions i like procharger sounds but whipple is fine too .Truck has 5.3 80k and only mod is CAI.

some questions i have forbthose who have procharged or supercharged

1.was the DOD eliminated?

2.can you covert to e85/flex and whats needed

3.with flex is fuel tapped out on injector/pump

4.what would compromise my smog passing abilities

5. tuner or full kit?id prefer tonhave my own tuner to squeeze more out but is it worth it

I have no experience with blowers. Procharging is supercharging, its just a different style compared to the more well known roots style blower.

1. You can eliminate it but you dont have to. Overall cost will go up dramatically, and you may as well change the cam if your doing the lifters.

2. Yes. You just need an e85 flex fuel sensor installed if your truck doesn't already have one.

3. Yes I believe with e85 you are really pushing your luck with the stock system.

4. Should be no issues with smog. As long as you have the factory converters I don't see why this would be an issue. Tuning is more of factor then the parts installed. With that said I have no idea what laws your state may have regarding aftermarket modifications.

5. I've heard the tuning that comes with a supercharger can be very good. If you want to get every last drop out if it, you'll want it tuned on a dyno and the street.

Edited November 22, 2020 by M1ck3y

15GMCALLTERRIAN · November 23, 2020

9 hours ago, M1ck3y said:

I have no experience with blowers. Procharging is supercharging, its just a different style compared to the more well known roots style blower.

1. You can eliminate it but you dont have to. Overall cost will go up dramatically, and you may as well change the cam if your doing the lifters.

2. Yes. You just need an e85 flex fuel sensor installed if your truck doesn't already have one.

3. Yes I believe with e85 you are really pushing your luck with the stock system.

4. Should be no issues with smog. As long as you have the factory converters I don't see why this would be an issue. Tuning is more of factor then the parts installed. With that said I have no idea what laws your state may have regarding aftermarket modifications.

5. I've heard the tuning that comes with a supercharger can be very good. If you want to get every last drop out if it, you'll want it tuned on a dyno and the street.

Thanks for the reply, i may just be over thinking this CA smog crap. Still undecided on the blower style , leaning towards whipple at this time but flirting with procharger . I may get either and add that flex fuel sensor or conversion then see what i can do with 91 Change the pulley and see where i run out of fuel injector or pump . Im thinking for sure ill need some more fuel if i go e85

gat0r · December 2, 2020

since you are in Cali

make sure whatever you get has a CARB#

15GMCALLTERRIAN · January 11, 2021

Thanks everyone for the replys , the current progress is that the 2.9 whipple kit has been ordered has a carb sticker and come with whipple tune easy bolt on and go . Ofcourse im looking to push the envelope still to squeeze out another 100-150hp .

looking into but not committed to

-e85 sensor

-lt4 injectors

-lt4 high pressure fuel pump

-jose zambrano 535 intank

-3bar map sensor upgrade

-custom tune

-ict spacers for whipple /lt4 pump or grind manifold

Not sure if grinding the whipple manifold or using the ict spacers for the lt4 , the cost and all the extra is worth the hassle of possibly not passing smog . If smog wasnt an issue it all be worth it . I guess im still trying to convince myself if i should go all in and risk not passing smog. I want to believe thatbifbthe truck is tuned with the fuel upgrades correctly it should not have any issues passing but i have no clue if thats how it works

flyingfool · January 11, 2021

i wonder how well a 8psi single turbo, without an IC would work on these trucks.? keep the power down to 480hp. i think the stock fueling system can support that.. shoulnt cost more than $2500 diy on 91 octane

Edited January 11, 2021 by flyingfool

gat0r · January 12, 2021

might ask whipple, if they started modifying their superchargers to allow for the lt4 hpfp.

if they did, could save a few bucks

flyingfool · January 12, 2021

On 12/1/2020 at 11:12 PM, gat0r said:

since you are in Cali

make sure whatever you get has a CARB#

does the LT4 SC have a carb number?

gat0r · January 12, 2021

3 hours ago, flyingfool said:

does the LT4 SC have a carb number?

i am not familiar, but i would assume no it doesnt (not by itself). As all the kits on tuner pages that i have seen clearly state they do not have CARB & not Cali legal.

i think the only way for an LT4SC to work in Cali is to buy a whole crate engine w/ SC from GM