GM standalone <$200

[kysard]

I hope others here know about the GM Sunfire ECU 749 for which the code as been broken and can be programmed just like a full standalone for less than $200. The ECU can be configured for a 3bar MAP and was used in factory turbo applications like the cyclone/typhoon. Unfortunately only JWT has the ability to program the 240sx ecu. Please don't respond with I wouldn' want a GM part on my nissan. $1600 for a standalone is a ripoff as is a JWT chip.

The only catch is the 240sx factory distributor, somehow we need to find a way to convert it to an HEI (gm type). Last time I researched this no one knew how to do it, I know that both the ford people and mopar people have figured out how to do it for their cars. Has anyone figured out how to make the 2.4KA distributor an HEI?

[MikeMurphy]

Out of curiosity, how can the 749 be reprogrammed?

[npaulseth]

I hope others here know about the GM Sunfire ECU 749 for which the code as been broken and can be programmed just like a full standalone for less than $200. The ECU can be configured for a 3bar MAP and was used in factory turbo applications like the cyclone/typhoon. Unfortunately only JWT has the ability to program the 240sx ecu. Please don't respond with I wouldn' want a GM part on my nissan. $1600 for a standalone is a ripoff as is a JWT chip.

The only catch is the 240sx factory distributor, somehow we need to find a way to convert it to an HEI (gm type). Last time I researched this no one knew how to do it, I know that both the ford people and mopar people have figured out how to do it for their cars. Has anyone figured out how to make the 2.4KA distributor an HEI?

I completely disagree with you on $1600 for a standalone being a ripoff. Not only do they make a ton more power, but they are mouch safer than mail-order tunes.

Noah

[andrave]

right, but you are retarded so your opinino is discounted.

no, seriously, thats a lot of money. our cars are 1000 dollars, 1600 for ECU is a lot of money, no matter how good it is. I think this GM stuff sounds interesting. I really wish AEM was cheaper, it'd make the decision much easier.

[jmauld]

Is there a discussion group on using this ECU?

[SHIEF]

There is a websited dedicated to standalones. But I'm drunk and can't remember the site. Ask demj (mod on NICO) I think he knows what it is, they might have discussed this. Until I see proof, I'll save up for the AEM, when I need it

[Bernard]

Why wouldn't you just program your stock ecu? Get a daughterboard, eeproms to tune with, download romeditor and away you go. No rewiring, no sensor fabbing etc.

[Jeff240sx]

Why wouldn't you just program your stock ecu? Get a daughterboard, eeproms to tune with, download romeditor and away you go. No rewiring, no sensor fabbing etc.

This isn't complicated. GM = MAP sensor. Nissan = MAF sensor. No matter how much reprogramming you do to a KA ecu, you'll never run a MAP sensor. Meanwhile, reprogramming the GM ecu, which maps are apparently open-source for, is easier than bieng the #3 or 4 guy to crack a KA code.

If possible: The new engine management pecking order would be something like:Full standaloneGM ecumail order KA + piggybackMail order KApiggybackhacked mafnone.-Jeff

[SHIEF]

I'm a azzhole, sorry

Modified by SHIEF at 10:08 PM 11/1/2004
Modified by SHIEF at 10:09 PM 11/1/2004

[npaulseth]

If you are using an AEM, you have a MAP sensor.

[jmauld]

Why wouldn't you just program your stock ecu? Get a daughterboard, eeproms to tune with, download romeditor and away you go. No rewiring, no sensor fabbing etc.

Where can you get a daughterboard for the S14 KA ECU? I've searched and haven't been able to find one yet.

[Jeff240sx]

Not trying to be a total d!ck

A bit late for that.

Quote »Obviously you have no idea what your talking about, and you make it clear. So your telling me there is no way you can make a MAF sensor engine ecu setup work with a MAP sensor ecu setup?[/quote]As far as I know, no. Not by strictly reprogramming the ecu, you can't run a MAP sensor setup with a MAF sensor ecu. I'm sure it's possible, but that's a) way beyond my scope of knowledge, and b) obviously harder than it seems, or 240 people wouldn't be paying megabucks for the HKS VPC, or rerouting their bov to recirculate. They'd just get a rom tune and run a map sensor to allieviate all the post-shift stumbling. laf.

Quote » I'll wait till Ivan sees this and lets you know how his MAP setup is working on a kadet. [/quote]Again. As far as I know, Ivan is running the AEM EMS. And your point is?

Quote » Or any Honda guy who has switched his MAP setup to a Corbra MAF (sounds dumb, and is, but it's been done over and over). [/quote]Uberdata, Hondata, and self programming, because the honda ecu program has been raped for all it's worth, and have dirt cheap standalones.

So, to recap:A. If I'm wrong, don't be a douche and simply correct me. Don't tell me how wrong I am and have completely useless arguements.B. Why would people pay for standalones and the VPC to get a MAP sensor, when, by your logic, JWT could have reprogrammed the ecu from MAF to MAP. C. Don't bring up Ivan with his AEM EMS and talk about how he's running a MAP. That's not what I said, is it? You can do anything you'd like with a standalone. But we're talking about a ecu rom tune, aren't we??D. Don't bring up Hondas without knowing more about the exact setup, because your evidence is circumstantial at best.E. Don't be a tool

-Jeff

[Jeff240sx]

Where can you get a daughterboard for the S14 KA ECU? I've searched and haven't been able to find one yet.

Nobody has them as far as I know (sans JWT), but I do know Matt and Scott personally, and they do OBD-2 to OBD-1 conversions with a harness and run the s14s off a s13 ecu with their rom tune. The problem is that the s14 ecu is very different in the way the data is transferred back and fourth, and '95 have one ecu layout, while the '96 has 2x the chips to it, and is again, very different.-Jeff

[andrave]

so was my post in this thread deleted or have I suddenly gone blind/crazy?

[Bernard]

Check here: http://www.tangentrix.com/forums/index.php

I never meant reprogram the Nissan ecu to use a map sensor, although it's been done to a z32 ecu in Japan. I just seemed like no one is aware that a fairly easy solution is available for the 95 and earlier Ka's. 89-90 use an eprom, and a daughterboard from one of the guys from the above link works with the newer KA. I'm going to be installing one in a 93 shortly. I've had a close look at the Sunbird ecu and it would work perfectly with a somewhat difficult conversion to the output signal from the cas to the ecu. It's way easier to buy a bigger maf. That would/should be #1. The only hard part of tuning a nissan ecu is the fact that you don't have a boost reference to any of the tables. You have to perform a few enrichment tests to determine what column you're accessing. An hour or two of getting to know where you are beats rewiring and fabbing and etc etc......

[kysard]

Guys, even if someone cracks the nissan KA ecu it won't handle a 3 bar MAP. Look at http://www.thirdgen.org, there is a lot of info there about the 749. With a romulator you can even tune it while driving. They are working on a patch to run closed loop WB!

The trick is the ignition, now I found some info that a datsun 510 distributor can be made to fit a ka. And the datsun 510 distributor can be converted to HEI. I also found I guy who may be able to convert a KA distributor to HEI (he needs some dimensions.)

[masamunex03]

If possible: The new engine management pecking order would be something like:Full standaloneGM ecumail order KA + piggybackMail order KApiggybackhacked mafnone.-Jeff

Where would this one gohttp://www.tamparacing.com/for...91304

[hannibal]

i ve seen this thread for a while, but never read it. A $200 fully reprogrammable ECU (aka standalone) is an amazing deal. Thats cheaper than piggybacks.Can someone tell me what a HEI distributor is??

[kysard]

An HEI distributor is a standard GM distributor. The only thing holding a KA-T back from being run by a fully programmable GM ECU is the damn distributor. Getting rid of the MAF is a big plus as far as turboing, just the piping alone.

[elesjuan]

I have a better solution thats been harder tried, tested, and PROVEN solid.

Personally I have built 2 of these systems myself, one for a motorcycle and the other for a turbocharged ranger pickup. If you can use a laptop or desktop computer with windows 98 and a mouse, have some time and paitents you can program this computer with free software and a Serial 'null modem' cable. Not to mention there is a BOAT LOAD of support and updates for the hardware and software.

Car Craft article on the system: http://www.carcraft.com/techar....html

Their website: http://www.bgsoflex.com/megasquirt.html

Their Message Board: http://www.msefi.com/

[elesjuan]

An HEI distributor is a standard GM distributor. The only thing holding a KA-T back from being run by a fully programmable GM ECU is the damn distributor. Getting rid of the MAF is a big plus as far as turboing, just the piping alone.

If the system is setup properly, MAF is actually a good air metering system for a forced induction system. On a stock N/A PCM it responds a lot better to boost (to a point, anyway) than if it was just a speed density (MAP) system. Thats pretty much why a large majority of cars that come from the factory turbo are MAF system; Toyota MR2, Eclipse/Laser/Talon, the old Turbo Ford, the Grand National/T-Type/Turbo Regal to name a few.
Modified by elesjuan at 5:36 AM 11/11/2004

[elesjuan]

I also totally forgot to add.. The best (easiest) to program standalone EFI system has GOT to be the Simple Digital Systems SDS-EFI:

http://www.sdsefi.com/features/feature2.html What do you know? A 240 with a KA24ET.

http://www.sdsefi.com/ is their homepage. They're pretty affordable too, not 1600$.