Bruce Nunnally

Cadillac’s Giant 4-Cylinder Engine Has A New Dual Volute Turbo

Recommended Posts


Very interesting design, I am confused as to why the highway gas mileage is less than a 5.7L though in the Silverado.  I suppose however its due to the Silverado's weight vs a 4 cylinder that has to work harder.  


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Share this post


Link to post
Share on other sites

I added this comment to the video: For 2020 Chevrolet shows the 5.3L/8speed/2WD at 17/23 mpg (vs 5.3L/10speed/4wd 16/22), and the 2.7L T/8spd/2WD at 20/23 mpg. So the 2.7L is 17% better in city, same highway in the same configuration. An interesting factor on the 2.7L is the low-rpm torque, and what potential it has for tuning.

I don't have comparative hp/torque charts for each of those engines, but I suspect the 2.7L drives better

5.3L: hp 355 / 265 @ 5600 (SAE certified) Torque 383 / 519 @ 4100 (SAE certified)

2.7L: hp 310 / 231 @ 5600 (SAE certified) torque 348 / 473 @ 1500-4000 (SAE certified)

So the 5.3L makes more peak power, but the 2.7L probably feels more 'torquey' off the line.

On the other hand, if they had put the 5.3L in the CT4-V people would be singing praises as a small sedan with a V8.

Reference: https://media.chevrolet.com/media/us/en/chevrolet/vehicles/silverado/2020.tab1.html


Bruce

2016 Cadillac ATS-V gray/black; 2013 Cadillac ATS 2L Turbo Premium (Wife's)

Follow me on: Twitter Instagram Youtube

Share this post


Link to post
Share on other sites

I'm guessing hwy mileage suffers in the Silverado because of the lack of aerodynamics as speed increases.  Turbos can be efficient but only when they aren't called on (too much) for that extra needed power (kind of like a four barrel carburetor of old; efficient when power isn't needed but the extra power is available when the back two barrels kick in; my analogy to the turbo is the boost not used unless needed).  At hwy speeds, I'm guessing that the 2.7 turbo is relying on boost to run at speed.  The CT4 cuts a much better air path so it works much better at hwy.  Well, that's my take on those numbers anyway.


Chuck

'17 XT5, '04 Bravada........but still lusting for that '69 Z-28

Share this post


Link to post
Share on other sites

Perhaps at highway speed both multi-displacement engines are operating on two cylinders, the 5.3L on two 0.6625L cylinders, the 2.7L on two 0.675L cylinders, and so are pretty similar in fuel consumption.


Bruce

2016 Cadillac ATS-V gray/black; 2013 Cadillac ATS 2L Turbo Premium (Wife's)

Follow me on: Twitter Instagram Youtube

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.