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stock ecu running mpi starion


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I dont know why I didnt think of this before.... but why not use the 86 and below ecu with 4 injectors setup with 2 banks. 1+4 are a bank and 2+3 are a bank. from there with a maft or safc you should be able to fine tune it out. that would be worth a shot i suppose.

I mean the 86 and under ecus alternate firing regardless of boost or anything. thats just how they work. granted there is little flexability, and no tuning support for the stock ecu, being that it runs super rich anyways, and its still maf based :roll: if you try that and it doesnt work, buy a msns-e unit. :o

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hmmmm, well a few things......

Msqt is good stuff but a serious learning curve with tons of reading, then more reading and the babysitting. Seen enough quirks to say that even a starion ecu never had those 'issues'... not to mention the frustrations. :)

Few might trust their soldering to 1000 mile road trips.

 

Major tbi downsides are poor distribution and expensive injectors. Both eliminated with this setup.

he's driving a mpi starion, spent $0 on electronics. No rewiring. Point out the others.

Average hobbyist curious if its possible... 20 posts later he's up and running. Which system can get you that ?

He "should be" tunable with a $200 translator.

Remember some of the fastest SQs to pass thru here were fuel-only.

 

Off to a promising start imo. Once tested for reliability and tunable you might see more go down this path.

Why would it be termed "a waste of time".... what am I missing ?

 

This topic has been brought up on Ryddlers old boards years ago. A couple even claimed to have running examples. Never seen 'em posted more on it tho. Austarion thread is a good detailed one.

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James at CNM had this in progress in '97 '98 ish.

 

He was working on getting 2 '86 ECU running 4 injectors. Said it was totally doable.

 

I think back then it would have been something good to do but now with all the options out there I'm not sure I would put all the time into it. I'd go for a DSM ECU swap over that swap.

 

That's not to discredit the efforts, I acknowledge that for sure.

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This is what I thought of when I saw that twin TB post. I was thinking not of mpi but two separate fuel systems on separate intake and headers with two small turbos, one injector in each TB not activated until boost reached the next psi above stock that way you could start, idle and cruise normally just have the gas for high boost and WOT but this is not for mpi cause that would mean a translator and then you are not using a stock ECU. You would need dual feedbacks but only one would control ignition. You would have lower charge temps from not going to high boost levels this way and 2 small stock 3.0dsm turbos with a 1G MAS isn't even going to require a FCD, increased fuel pressure or a huge intercooler but is it worth the effort? You'd need two stock intakes to mod to get the extra TB base to weld at the short straight section just after the "Y" but I'd close both sides of the TB up and let the air go out the bottom of the TB and mount them vertically and point the inlets towards the front.
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When searching for a 91-94 dsm ecu, I came accross two out of about ten that were good (didn't have the caps blown out)... a chronic failure problem with them, from what I've encountered.

CAS adapt to a g54 is quite a task.

 

Dual ecu or tb way too fussy, nothing like this 'clever' mpi.

 

You know, even today I can't say that I've ever seen a starion mpi conversion *so simple and inexpensive*. Compare it to any alternative.

I have all the same parts, it'd be a crime not to try it - for sch1ts & gigggles if nothin' else.

 

For the 2.0, he could wind up with a $300(parts) fuel-only tunable mpi conversion (including the $50 sonata intake). Will also apply to the sohc 2.4 truck motor, which luvs boost but already comes mpi factory.

Loads of potential 'on a budget'.

Possibly the best "bang for the buck" mod I've seen.... seriously.

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Remember some of the fastest SQs to pass thru here were fuel-only.

 

WHAT?? Where did you hear that from? I'd have to call BS on that statement, unless you can name a few of the "fastest" that are fuel only.

 

I have a good knowledge of the fastest SQ's (that were running G54B) to past through, and what EMS's they were running. And that I know of, were fuel only.

 

Once you get your fuel set, the power in your setup comes from your ignation maps.

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V8 slayer

sds fuel-only, hacked stock intake/mpi - 12.8 on a 12A

Q

full wt. quest with ac, blowthru carb - 11.8 no intercooler

 

Seen any programmable igniton cars match those feats ?

Not saying they can't, only what the g54 mech ign curve could do.

 

on the TBI side;

chris viper

TBI, emanage, 18g - 334hp/387tq (not drag but respectable power imo)

 

barbercb

17C, stock cam, maft/afc - 12.9

 

Nitronick

16G + small shot - 12.4

 

Tracy (Bulldog)

Heavy show quality car, TBI, t3/t4 + spray - 11.3

 

Fast enough for ya ?

I can go on listing, but u get my drift (I hope). A properly functioning g54 igntion curve is far better than many "think". Proven.

I have no idea what they base that on.

It just might be 'good enough' for many folks goal.

 

If you read the austarion thread, his mpi conversion driveability and performance accolades are no different than typical, eh.

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Frank (V8-Slayer) was running a pretty radical ignition map when he made that 12.8 run on a 12a. Just because the dist is on the car does not mean it running a stock map. You can't believe that, that run was made by boost and fuel. That was not just some "hacked up" stock intake that he had on that car. There was allot of time and effort put into it. I would know this to be a FACT better then anybody, other then the man himself. Because that intake is bolted to my car right now.

 

The rest of your list are all TBI cars, except for the carb car you have listed. Thus there power is limited in there potential. And the stock ignition map has a lot to do with that. It's not just SQ, it could be proven on any car. A stock SQ map changes as the weights in the distributor wear out.

 

Your original statement was;

Remember some of the fastest SQs to pass thru here were fuel-only.

 

It should have included the acronym TBI in there. How can you not mention Heefner, Chip, Art, Chad, QuestTSi, 88whitestarion, BMWTech (Bill_TSG), or any of the other high-powered cars that have been around for some time and are still around?

 

The fact is, the ignition map is where you make your power. Fuel only cars will never be able to stand up the power and torque a full standalone will make. Don't kid yourself, everybody knows that.

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Don't take the word 'hack' the wrong way, results are of importance here. Call the intake 'modified' then, still works regardless, eh.

 

You asked about "fuel-only", why would I mention Chip, Heef, etc.. ?

Didn't you get the point ?

 

Most heavy fast street cars are run by boost and fuel.

 

Are the above examples still not fast enough for you ??

So what if some of the fast cars I listed were TBI ? Do you honestly believe that the addition of tunable MPI fuel distribution to any of 'em, would make them worse off and slower ? lol

This austarion mpi conversion is a classic case, right in front of u

 

Lets not forget, the stock ignition curve is "tweakable".

 

Bottom line... you can have a fast enjoyable street starquest without electronically programmable ignition control. Fact.

You'd be the one kidding yourself if you ignore the proof.

Is it "the ultimate" ? Nope.

Will/has it delivered the goods for many fast G54s ? You tell me

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