LSJ is not DI?

 

Is there any relation to intake air temp that I can read with my Aeroforce gauge? So mixing 94 with some 114 octane unleaded race fuel will help you think? I am definitely interested John in what you are cooking up.

 

NO, LSJ is a Port injection based engine. 2.0 LSJ, 2.2 L61, 2.4LE5, 1.4T, 1.8. Now those supporting DI are 2.0 LNF, 2.0 LHU, 2.0 LDK and heck I'll throw in the 3.6-8L V6 found in the camero and cadillac's is DI.

 

With this issue plaguing DI engines, it rises some concerns in the up coming C7 Corvettes. Hmmm...

 

yes good one, the v6 di from GM have a big inlet valve coking issue; a big schmoo from GM has commented on this , its on another thread someplace...

 

last night i drove about 40 miles to a town, and i was in 4th gear going 60mph. i was a 3k on rpms. but ill let ya know what i find. also the redline is gone. got me a 09 LNF g85 cobalt now

 

Toyota is working on a combo DI/conventional port injection motor. They say it is for fuel economy reasons but I wonder if carbon build up is the real issue. I saw this other article the first time I started digging into the issue.

Ask An Engineer: GDI Problems In A Nutshell | The Truth About Cars

There are some manufacturers (e.g. Mercedes) who are trying different things to fix the problem but they are all very tight lipped about how.

This article talks a bit about the current crop of engine designs and where some are headed. Click on the pic of the ecotec turbo for the slideshow.

Design News - Captain Hybrid - Slideshow: Internal Combustion Engines Primed for Performance

 

Good post Miko. Trouble is, Cruze daewoo motor is port fuel injected, not DI.

Toyota did it for idle smoothness no doubt. Dont forget we have guys using Meth who sau it did not help. I said at the outset no one thing is gonna be the silver bullet for this; but the fact is, a lot of the issues can be tracked to the pcv. system. So the latest product from Powell raceshop will address this part of the equation. We will be using parts made in North America....

 

Do you care to elaberate what part that is that you have/are making. Cause what ever it is. I want one so I don't fall under this issue someday.

 

thanks for the interest. i will elaborate when I have a finished product ready and priced. sorry to keep u waiting.

 

And this is why I love having port injection on my direct injected vehicle!

 

R&D never ends. All companies are looking for a way to improve their product and do something that nobody else can do. The reason they are tight lipped about it is because it might takes years to even get the idea to work, that's before you even start figuring out how to make it or fit it to your product.

Toyota's injection system was relatively simply. They took 2 products that already exist and put them together. It was a tuning and money thing. Most likely its a short term fix like tbi injection was.

 

Would a fifth injector work to keep things more clean in there?

 

Put me on top of the list John. Just give me the word and I will be at your shop. Lol...
ETA?

 

Yeap, fuel would be passing across the valves. Thats why DI has so much gunk build up. Fuel doesn't pass across the valves any.

 

1 injector that doesn't run all the time may not be enough flow to do much. Probably need something that's always going to really do anything.

 

If one thing of seafoam can clean your valves every 8k miles or so then I guarantee a few gallons of ethanol every 8k miles will help
keep the valves clean....it all depends on if you actually go wot more than once a week for a full gear pull. I do, so in my case I'm good, lol.

 

Have you not read any of the posts in this thread that stated the Seafoam doesn't work on our car?

 

second question, can u install a 5th injector just for that purpose and not run rich

 

I don't know exactly what is able to be tuned by trifecta or hpt but in theory the 4 cylinder injectors could be setup to inject less fuel and the 5th one could make up the difference. It might be a pain in the ass to get it working correctly so all the cylinders are getting even and correct amounts of fuel.

How does the 5th injector tuning work? Can someone explain the basics?

 

Oh, my bad...too many pages to read. Fact of the matter is ethanol is most likely a better cleaning agent than seafoam. Its a form of alcohol...lol...

 

I try to do a WOT every day, problem is staying within speed limits, traffic, and no traction in second gear means it's usually only very short. At least my drive is 25 to 30 minutes mostly on 80kph roads so I'm hoping that has at least slowed it down.

 

Ethanol isn't really that strong of a solvent. Methanol, acetone and toluene on the other hand....

 

I believe it works off of the wideband 02. It determines whether it needs less or more fuel via the wideband.

 

I bet if a person could have the 5th injector and have complete control over it, that might work. Such as dial back the DI just a touch, and have the 5th on a little to make up the difference 100% of the time.
It would be downgrading the technology a LITTLE bit but if it worked... who cares?

I'm not a tuner and don't know jack about it. Just a thought I had.

EDIT: Oh I didn't read first. I see emiller had that idea.