What kind of injection method do stock 1G turbo DSMs use?

[XC92]

Sorry for the stupid newbie question but anything having to do with the engine from intake to exhaust is still mostly a mystery to me as I haven't yet tackled that part of DSM maintenance yet (except replacing the TB/BB/WP, which I've done, but I see that as attached but still external to the engine itself).

But, I'm just wondering what specific kind injection comes stock with a 1G turbo DSM. E.g. direct, port, multiport, etc.

I'm asking because I just read that Penzoil's Ultra Platinum is not necessarily suitable for turbo engines with direct injection, because it contains more calcium than standard Platinim which can mess with low speed pre-ignition:

Pennzoil Platinum vs Ultra Platinum: Key Differences - Autocornerd

Pennzoil Platinum vs Ultra Platinum Synthetic Oil, both motor oils have fewer impurities, cleaning additives, and can withstand higher temperature levels.

www.autocornerd.com

 

[1990TSIAWDTALON]

We are direct port. The injectors sit right on top of the valves basically.

 

[XC92]

We are direct port. The injectors sit right on top of the valves basically.

Thanks. I thought I read that they were multiport or MPI or something. This stuff is confusing until it isn't.

 

[1990TSIAWDTALON]

Easier to give you a link than type it out. HERE is an explanation. I call our stuff direct port.

 

[We're on Boost]

I'm asking because I just read that Penzoil's Ultra Platinum is not necessarily suitable for turbo engines with direct injection, because it contains more calcium than standard Platinim which can mess with low speed pre-ignition:

Our engines are not direct injection. So the Calcium - LSPI problem you are asking about should not be a problem in our engines.
But it's kind of an interesting thing just to know about, and I gather it's a main reason for the new SP certification level, which happened because a lot of the newer engines are direct injection.
Here's an interesting chunk of video about it by a guy who I think has it pretty straight:

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Direct Injection means the injector goes right into the combustion chamber. Ours aren't like that. Ours go into the intake runner, like in the diagram in the article Marty posted. That article doesn't show any diagram for direct injection. You would have to google Direct Injection or Gasoline Direct Injection to find diagrams/Wikipedia article, etc, for that.

 

[XC92]

So sequential injection is better than multiport injection which is better than direct injection, and 4G63's are multiport, basically in the middle?

I didn't want to waste everyone's time by asking but I couldn't find it in the FSM or by googling. I'm sure I would have found it eventually though.

I wish the complete VFAQ was still up. I'm sure that it addressed this. Is there an archived version that one can download?

 

[steve]

There are several technologies being mixed here.
Where the injectors are located, how many, and how they are fired.

Direct Injection has the injector located in the combustion chamber.
Multiport injection is a type of a manifold injection system, which inject fuel into the intake manifold or head intake runner.

Batch fire is where all the injectors fire at the same time.
Sequential fire is where each injector is fired individually.

DSM's use Multiport Injection and both Batch and Sequential fire strategies depending on engine conditions.

Reading the 1G 1990 DSM Technical manual should be mandatory.

1G DSM 1990 Technical Information Manual

Part of the promotional material from Chrysler previewing the then brand new vehicle

www.dsmtuners.com

Gasoline Direct Injection is the latest technology and has great benefits and drawbacks. You need high pressure fuel pumps to over come the cylinder pressures at the time of injection and you no longer have fuel washing down the intake valves so you wind up with carbon buildup.

 

[danl]

Sequential is compared to batch firing injection and is not related to port injection or direct injection.

Batch injection means that all injectors fire at the same time, no matter if the intake valve is open or closed. Sequential injection means that the injector starts firing when the intake valve opens. Obviously at high injector pulse widths, you can not inject all the fuel just when the intake valve is open, so at high loads the injector will still be spraying fuel on the back of a closed intake valve. DSM's are sequential port injection.

Port injection just means that the injector is in the intake port. Direct injection means that the injector sprays directly into the combustion chamber.

To finish it all off, throttle body injection or TBI, is when the injector is placed near the throttle body and feeds all cylinders, similar to a carbuerator.

Edited to correct typo.

 

[1990TSIAWDTALON]

Not being a wise ass, don't confuse TBI with TPI. They are drastically different.
Throttle Body Injection is where the injectors fire into a plenum.
Tuned Port Injection is where the injector is basically in the same place our DSM injectors are at, right at the end of the runner. I have a TPI car and had a TBI truck. Not even close to being the same type of injection system, just to clarify.