Ideal cruising rpm for DI cars?

[Wylie6G72]

According to BG they can, and do. GM partnered with them, and GM recommends their induction service be done every 15,000 miles.
I’m not saying it works wonders, but I feel like GM wouldn’t have partnered with them, and renamed the product under the Acdelco name if it didn’t work.

IMO, those induction services are right up there with "protection packages" as a big money grab for dealerships. Of course GM jumped at the chance to partner with a well-known product name to sell services. Nobody would be swayed to buy an "AC Delco Induction Service" . Attaching a well-known name to it helps them sell more of them. Win win for everybody, except the car owner.

 

[That John dude]

IMO, those induction services are right up there with "protection packages" as a big money grab for dealerships. Of course GM jumped at the chance to partner with a well-known product name to sell services. Nobody would be swayed to buy an "AC Delco Induction Service" . Attaching a well-known name to it helps them sell more of them. Win win for everybody, except the car owner.

Someone would have to be willing to take before, and after pictures.
I would love to see it, and see if it would work.

 

[ltslimjim]

It is the BITOG way! But many great and interesting conversations have been started thanks to us overthinkers.

For some reason, this comment made me think of this anime the Big O and an epic speech from one of its characters that was always trying to figure out this great conspiracy and turns out he was right!!





Extended edition for the overthink crew:

 

[BMWTurboDzl]

This is something I've never seen discussed anywhere but I've been curious about ever since I got my Corvette 6 1/2 years ago. Is it detrimental for engines with DI to be cruising along for long periods of time at lower rpms? Would that create more or less intake valve deposits in other words? When I go out for long drives in my Corvette I will sometimes choose the highest gear possible for that speed and the engine can be as low as 1200 rpm. It's not lugging the engine on flat ground or anything (I always go down a gear or two if climbing inclines), and being a 6.2L V8 it doesn't lack for low end torque even at barely above idle speeds. But sometimes I feel like it might be better to drop down one gear for those occasions, and have the engine at 1500rpm, or even one more gear and have it at 2000. Am I overthinking this? Obviously there is going to be lower fuel consumption choosing the highest gear at all times but I also don't want to do it if that sustained lower rpm results in more issues in the long run with regards to intake valve deposits (and for the record, this LT1 engine does not seem to have an issue with major intake valve deposits based on what I'm seeing on the forums, and this particular engine came out in 2014 originally, so it's got 10 years out there now)

I would think then engine is running as lean as possible at steady state highway speeds.

My TGDI turns around 2k RPM at 80 mph

 

[Patman]

I would think then engine is running as lean as possible at steady state highway speeds.

My TGDI turns around 2k RPM at 80 mph

My Corvette has a very tall 2.41 rear axle ratio, so combined with the 8 speed transmission that means at 80 mph the engine is only at 1500 rpm.

 

[buster]

There was a paper that was put out by Audi that said to run the DI engines at 3000 RPM or more for 20 minutes every now and then I forget the time interval. I had an 2007 Audi 3.2 A6 which was known to have a carbon issue on the valves. I drove the car to 148K miles without any carbon issues on the valves by doing this.

I thought I read something similar recently about this.

I'm usually at 2k rpms @ 80mph. Lately I've been using "L" mode in my truck, locking out 6-8 gear. This keeps the transmission from hunting so much and the rpms stay between 2,300-3k.

I'm more of a believer that running engine harder now and then helps the overall engine life.

"I’ll add minimizing short stop and go drives where the engine hasn’t heated up to operating temp. In my time working on BMW DI engines, the worst cases always seemed to be the cars with the lowest miles that spent a lot of time idling. The higher mileage cars that were on the highway regularly were plagued less by this problem.

In the early days (N54) BMW AG was pushing back on warranty claims trying to put the blame on fuel quality and driving style. They’d request fuel samples to test, etc. It was really annoying to deal with as a tech."

 

[Patman]

I'm more of a believer that running engine harder now and then helps the overall engine life.

I'm right there with you on that one, which is why I try to get a few full throttle blasts in every time I drive the Corvette. Usually when merging onto the highway, I'll go full throttle from 60kmh up to about 150. It'll spin the tires on a full throttle downshift at 60kmh, so much fun!