Gurus: MPFI with Mexican cal?

[Glacial]

Quote:

Originally Posted by Una Sounds like an easy route to me. Just make sure it's a turbo SBEC, the TBI SBEC probably won't have the extra injector drivers..

Rock 'n roll. Guess I'll be the guy to find out if the Mexicans used a TBI distributor or a turbo one

THE BURRITOMOBILE SHALL LIVE.

[sgtarky]

I understand you are nightmarish cheap but getting the mega squirt with wiring harness isnt much considering the headache you will have with anything else. Plus you can do all the adjustments with your computer. I am definately going that route with my lebaron. Budget wise I will put the motor together and see if the computer is still functioning, if not I will buy a megasquirt and if it does work I will still replace the blasted thing just at a later date.

[Whorse]

How do you know which fuel injectors to use?

[RPMurph]

i would go with 27# (2.2 tI) and a AFPR

[Glacial]

Whorse, RPMurph: I was thinking either those (27s) or some manner o' 19lb injector, maybe Buick V6 jobs. Gary D's site lists a part number for Mexican injectors: 4554130 (anyone feel like looking it up?) I suppose they'd be optimal...

sgtarky: Indeed it is, but part of the appeal will be to create a MPFI setup using all Mopar electronics -- (even if it's Mexican, hence the name of Burritomobile)

Unfortunately I've just had to lend all my spare coin to a less-than-useful relative, so this project's shelved for a little while. Grumble.

[R2D2]

I know this is a little bit late, but maybe will be helpful to someone, so I will resurect this thread!

I live in Mexico, recently a friend of mine ask me for help to make a NA MPFI - Turbo conversion. We took a Mexican 1991 2.5 MPFI Shadow and put a 2.5 Turbo II complete engine with a T3 Garret Turbo. We were planing to use a 1990 or 1991 Turbo SBEC, but we were unsure if the wiring harness has the same pinout.

For information: all Mexicans MPFI cars (1990 +) have 2 BAR MAP , 1 Piece Intake (with CTS), 46mm Throtle body, they use the 4554130 injectors (that were the same ones used here in Mexico on turbo II engines from 1991 - 1995 , I had these injectors flowed with a set of 4418213 & a set of 5277895, and the 3 sets flow almost the same), after 1991 they introduce the use of O2 sensor. So as you can see almost is identical to a Turbo engine except for the engine internals, all the sensor are the same also.

The 1 million dollar question was if the NA SBEC will have the same internal components as the Turbo SBEC, and if thery were compatible, so we open the SBEC and it looks they were identical. The next step was to socket the NA SBEC ... the EPROM on that SBEC was a M87C257 Texas Instrument. I read the eprom (If someone is interested on this cal PM me with your email and I will sent it to you) and then program it with the cal from a 1991 Mexican Shadow 2.5 TII, and install it on the NA SBEC. It work perfect, the only modification we need to make in wire harness was to wire the solenoid for the wastegate and the BOV (the mexican use one for the BOV but it doesn't have one the for the purge canister).

The good news is that this cal will work on any US Turbo SBEC I, and the wiring harness of a Turbo II or I (just need to wire the CTS) will work without any modification. We have test some US cals with Mexican SBECs, in Mexicans cars and they work just fine, without any modification on the wiring harness (only the code 31 appears for the Purge Canister Solenoid).

Conclusion: The US and Mexican Turbo SBECs are compatibles (also the Mexican MPFI SBEC), and the Mexican MPFI cal will work on any of these ECUs.

If anyone need more information, I will be glad to help you !

Erik G

[Runner]

Erik,

Brilliant. That answers lots of questions and validates/disproves the assumptions made about the elusive Mexican MPFI setup. It all makes perfect sense, having maximum reusability and fewer service parts across the entire product line. I imagine a 1-bar MAP cost Chrysler the same amount of money as a 2-Bar MAP, etc. etc. It's a turbo convertor's dream!

I'd love a 2.5 MPFI Omni, it'd have a little more oomph, better driveability and better gas mileage!

[Lone Eagle]

R2D2, that info is priceless. Thanks. If you have a membership(free) over at allpar.com, PLEASE repost in the FAQ section, or I'll copy/paste the entire reply for you over there. Several people over there are using parts from FFV cars to do MPI conversions, but FFV SMEC's are quite expensive.

[jory]

definately some good info there. it will be really useful to those who are converting to MPI.

Quote:

Originally Posted by capev86 on my 89 k wagon 2.5, which is going w/ modded 2.5/3spd out of my old dynasty, im going the full spirit ffv route. t1 intake w/ stainless injectors, stainless fuel lines and hoses, 18 gallong plastic tank, etc, etc, etc. when the time comes, i'll have to pick up an ffv spirit to steal all the parts from!

I don't think the FFV tank is 18 gallons. I haven't filled mine up fully yet, but I compared the steel tank and the plastic tank side by side and they were nearly identical in size and shape.

[Runner]

One more thing I was thinking of... The HEP - I assume it would use the turbo HEP with dist sync and dist ref, because you're having to time the firing of 4 injectors (all SBEC systems were sequential fired, right?) instead of the one.

Seems obvious enough...

Us folks in the US & Canada would also need a calibration that uses an O2 for sure, to pass emissions. Reading the thread above, that's a 1992+ calibration?

This is becoming a more tempting project for a daily driver, as I eye my rusty TBI shadow and extra 2.5 T1 intake and injectors.

[R2D2]

Runner: Thanks for your comments!!! About the HEP, you are right it uses a Turbo HEP! About the calibration that use 02 sensor, I made a mistake on the last post, they began to use it on 1991 (1991+); so the calibration I have has the 02 feedback and will work for your project! You will need to find a 1990 or 1991 Turbo SBEC (SBEC I), and the corresponding wiring harness!!

Long Eagle: I am glad that this information is useful!! I'll make some corrections and repost it on allpar forum! I will also send all the information I have on the Mexican MPI version to Allpar, may be it could be added on the NA (TBI and Carburetted) section !!

Hope this will be useful to those wanting to convert to MPFI!

If there's any question, I will be glad to help

Erik

[Lone Eagle]

Quote:

Originally Posted by R2D2 Runner: Thanks for your comments!!! About the HEP, you are right it uses a Turbo HEP! About the calibration that use 02 sensor, I made a mistake on the last post, they began to use it on 1991 (1991+); so the calibration I have has the 02 feedback and will work for your project! You will need to find a 1990 or 1991 Turbo SBEC (SBEC I), and the corresponding wiring harness!! Long Eagle: I am glad that this information is useful!! I'll make some corrections and repost it on allpar forum! I will also send all the information I have on the Mexican MPI version to Allpar, may be it could be added on the NA (TBI and Carburetted) section !! Hope this will be useful to those wanting to convert to MPFI! If there's any question, I will be glad to help Erik

Go to the EEK board and post it in the EEKFAQ section, and send a pm to a mod on this. Dave(head admin) might like this info for the 2.2/2.5 page.

[pmcnamara]

I read someplace.. here on TurboDodge I think.. about a guy who converted his 2.5 TBI into a 2.5 MPI.. BUT instead of using a Turbo Computer and Turbo Wiring Harness, he kept the stock computer and instead using injectors out of a Ford and used a full time spray.

I'm sure I'm not wording this properly, as I have been searching for this post for weeks now and can't find it, but I'm hoping someone else saw it and can resurrect it.

It linked to a website that had very through instructions including photos.