2.7 Turbo 4 Fan Club

Grumpy Bear · March 9, 2023

4 minutes ago, Flatus said:

There wasn't any laughing or reference to any humor in my post.

Laughing WITH someone is the ability to empathize with the situation. Ya know, "Yea, bro, I've been there"' sort of thing.

silveradosid · March 9, 2023

Flatus if the truck is running ok i wouldnt get to excited. you need to get it scanned somewhere else because that code is for diesel engines. some of the aftermarket code readers are not correct. example is i just bought an autel scanner and hooked it to my truck and read codes for a problem with the sun roof , which i dont have

Texcl2 · March 9, 2023

I’ve had a couple turbo underboost codes that were caused by air filter icing up from ice fog.

Flatus · March 9, 2023

11 hours ago, silveradosid said:

Flatus if the truck is running ok i wouldnt get to excited. you need to get it scanned somewhere else because that code is for diesel engines. some of the aftermarket code readers are not correct. example is i just bought an autel scanner and hooked it to my truck and read codes for a problem with the sun roof , which i dont have

He is supposed to bring it to the Chevy dealer today or tomorrow so hopefully they will get it figured out.

Flatus · March 9, 2023

8 hours ago, Texcl2 said:

I’ve had a couple turbo underboost codes that were caused by air filter icing up from ice fog.

Definitely no ice weather around here. (coastal Mississippi)

Texcl2 · March 9, 2023

Lol, plenty here, gonna get another 8” of snow this weekend unfortunately.

Flak_Jacket · March 20, 2023

I have tried to search for this but haven't succeeded. I just got a 2023 2.7 GMC Sierra. I am trying to find out information about the aftermarket filter replacement and intake tube. Not the $500 entire airbox replacement. Either the K&N or airaid specifically. I just want to know if anyone has installed them and what was the outcome. I have seen some install videos on youtube but they don't review after the install. I am not expecting a boost in HP even though airaid claims 10hp, but i am looking for information about the sound and if it gains any MPGs.

Does the turbo make more turbo noises? Does the 4 cylinder make the stupid "groning" noise more often or louder than it already does? Any increase in MPG? Do you have any pictures of the inside of the old airbox you could post? It's a huge rectangle box and would like to know if there are baffles inside to reduce sound? Any additional things you noticed that i might consider before buying?

Thanks in advance.

silveradosid · March 20, 2023

the air box and tubing is a high volume system already, it is over sized to make sure the turbo can get enough air. of course the after market is going to make claims of improvement, they are trying to sell you something you dont need.

Flak_Jacket · March 22, 2023

On 3/20/2023 at 7:10 AM, silveradosid said:

the air box and tubing is a high volume system already, it is over sized to make sure the turbo can get enough air. of course the after market is going to make claims of improvement, they are trying to sell you something you dont need.

I agree with you that the tubing is probably large enough to support the 310 hp it’s honestly way bigger than any other intakes on my old evolutions, sti, or Porsches that I have owned. I do not expect to see any increase in felt power from my butt dyno. The intake has to be designed for lots of sound mitigation though, the chambered shape and boxed design isn’t there for cost measures or ease of manufacture that’s for sure. This truck is my DD that I will put about 20,000 miles on a year. What am hoping to see is the possibility of a slight mpg gain and maybe some more and hopefully cool turbo noises. I have been messing with turbos since I got my first turbo car a Buick GN back in 1998. I have always owned some type of turbo car since then. I have also helped some rally teams and even rally cross teams with their cars, all turbo. Right now I own 3 cars that have turbos. I have learned that anything and everything pre or post turbo can greatly affect all, some or at least one of the following, sound, efficiency, driving manners, and/or overall total power output.

I am just hoping to add some additional turbo sound and fingers crossed additional .5 mpg if I’m lucky. I was hoping someone spent the $250 for me so I didn’t have to and was kind enough to post up a decent review somewhere. I guess I’m that huckleberry, because I have spend the money and it should be here this Friday.

Edited March 22, 2023 by Flak_Jacket

622Trailboss · March 22, 2023

20 hours ago, Flak_Jacket said:

I agree with you that the tubing is probably large enough to support the 310 hp it’s honestly way bigger than any other intakes on my old evolutions, sti, or Porsches that I have owned. I do not expect to see any increase in felt power from my butt dyno. The intake has to be designed for lots of sound mitigation though, the chambered shape and boxed design isn’t there for cost measures or ease of manufacture that’s for sure. This truck is my DD that I will put about 20,000 miles on a year. What am hoping to see is the possibility of a slight mpg gain and maybe some more and hopefully cool turbo noises. I have been messing with turbos since I got my first turbo car a Buick GN back in 1998. I have always owned some type of turbo car since then. I have also helped some rally teams and even rally cross teams with their cars, all turbo. Right now I own 3 cars that have turbos. I have learned that anything and everything pre or post turbo can greatly affect all, some or at least one of the following, sound, efficiency, driving manners, and/or overall total power output.

I am just hoping to add some additional turbo sound and fingers crossed additional .5 mpg if I’m lucky. I was hoping someone spent the $250 for me so I didn’t have to and was kind enough to post up a decent review somewhere. I guess I’m that huckleberry, because I have spend the money and it should be here this Friday.

Definitely post an update I’ll be interested to see your results

Mike Borowski · March 22, 2023

I have the K&N tube and filter. I’ve tried the K&N CAI and the AFE CAI and the K&N tube and filter is the best option IMO. It gives the truck a little more power higher in the revs, doesn’t lose any low end torque and more shockingly makes the engine sound pretty decent. Throaty even. Like a diesel.

Edited March 22, 2023 by Mike Borowski

Flak_Jacket · March 23, 2023

3 hours ago, Mike Borowski said:

I have the K&N tube and filter. I’ve tried the K&N CAI and the AFE CAI and the K&N tube and filter is the best option IMO. It gives the truck a little more power higher in the revs, doesn’t lose any low end torque and more shockingly makes the engine sound pretty decent. Throaty even. Like a diesel.

First thanks for commenting. Interesting. You had the afe and the k&n cai on the 2.7 turbo? Why did you remove them? Do you have a modified exhaust? I have heard the sound bites of the exhaust modifications and I feel the muffler removed and the resonator left sounds the best. I refuse to modify the exhaust on any DD. I also always feel like once you move or change the tube the maf is in you better be ready to tune the ecu. I have hptuners but I don’t think they support this platform yet.

The HO versions make something like 80% of the full torque at 1500 rpm for that to happen this turbo has to be very quick spooling. That also means the turbo is moving a bunch of air even at low revs. Any restrictive item in the intake system or exhaust will be some type of compromise either power or sound.

Side note the Cadillac ct4v version makes 325 hp and GM has been pretty clear the engines are the same. I’m sure the extra 15 hp is from premium fuel and better intake and exhaust.

Edited March 23, 2023 by Flak_Jacket

Mike Borowski · March 23, 2023

1 hour ago, Flak_Jacket said:

First thanks for commenting. Interesting. You had the afe and the k&n cai on the 2.7 turbo? Why did you remove them? Do you have a modified exhaust? I have heard the sound bites of the exhaust modifications and I feel the muffler removed and the resonator left sounds the best. I refuse to modify the exhaust on any DD. I also always feel like once you move or change the tube the maf is in you better be ready to tune the ecu. I have hptuners but I don’t think they support this platform yet.

The HO versions make something like 80% of the full torque at 1500 rpm for that to happen this turbo has to be very quick spooling. That also means the turbo is moving a bunch of air even at low revs. Any restrictive item in the intake system or exhaust will be some type of compromise either power or sound.

Side note the Cadillac ct4v version makes 325 hp and GM has been pretty clear the engines are the same. I’m sure the extra 15 hp is from premium fuel and better intake and exhaust.

I removed them because both caused me to get random check engine lights and run rough.

The pipe and filter have caused no such issues. The MAF doesn’t get moved (it does with a CAI), it’s built into the stock airbox.

Most likely it’s just altering the sound. I don’t have any exhaust mods and don’t plan on any. I’m not a fan of the 2.7 with exhaust personally.

My butt dyno says it pulls harder longer but I can’t prove it. I have the OG 2.7 not the HO.

Mike Borowski · March 23, 2023

1 hour ago, Flak_Jacket said:

First thanks for commenting. Interesting. You had the afe and the k&n cai on the 2.7 turbo? Why did you remove them? Do you have a modified exhaust? I have heard the sound bites of the exhaust modifications and I feel the muffler removed and the resonator left sounds the best. I refuse to modify the exhaust on any DD. I also always feel like once you move or change the tube the maf is in you better be ready to tune the ecu. I have hptuners but I don’t think they support this platform yet.

The HO versions make something like 80% of the full torque at 1500 rpm for that to happen this turbo has to be very quick spooling. That also means the turbo is moving a bunch of air even at low revs. Any restrictive item in the intake system or exhaust will be some type of compromise either power or sound.

Side note the Cadillac ct4v version makes 325 hp and GM has been pretty clear the engines are the same. I’m sure the extra 15 hp is from premium fuel and better intake and exhaust.

I was running a piggyback tuner called the JB4 for a while with 93 octane. I have no doubt it was making more power than the CT4-V but the transmission didn’t seem to know what to do with itself. It would pull hard on the highway but day to day driving was kind of choppy. Someone needs to come out with a true engine/trans tune and the engine could be a monster.

Edited March 23, 2023 by Mike Borowski

Flak_Jacket · March 23, 2023

6 hours ago, Mike Borowski said:

I removed them because both caused me to get random check engine lights and run rough.

The pipe and filter have caused no such issues. The MAF doesn’t get moved (it does with a CAI), it’s built into the stock airbox.

Most likely it’s just altering the sound. I don’t have any exhaust mods and don’t plan on any. I’m not a fan of the 2.7 with exhaust personally.

My butt dyno says it pulls harder longer but I can’t prove it. I have the OG 2.7 not the HO.

That was my educated guess based on past experience with tons of different cars with the cai. Get ready to tune for it or have drivability issues. I have heard that the dealer can flash your truck to the higher tq levels of the newer trucks. It’s just a couple hundred dollars and doesn’t affect warranty. Your truck runs at 20psi of boost pressure and the new ones are 27.

I have the 2023 so the intake should be even more noticeable in lower revs where it’s making max torque.

Edited March 23, 2023 by Flak_Jacket