Anyone using the 749 ECM?
Thread Starter
Racer
Joined: Nov 2002
Posts: 427
Likes: 0
From: Stillwater OK, Fun City USA
Anyone using the 749 ECM?
I am planning on using the Syclone/Typhoon ECM and a '91 Corvette MEMCAL. Anyone out there well versed on making changed to the this chip with the $58 mask? I need to change it from V6 to V8, turn off any fuel cut outs, etc...
Any Thoughts?
Thanks,
Any Thoughts?
Thanks,
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
I will be using a 749, and it is installed, but I have yet to comunicate with it. My turbo project is momentarily stalled. As far as the $58 and 6 to 8 cyl. that is as simple as clicking in the 8 cyl box. I have a 91 and will also use the memcal. Wiring it in would seem to be a bigger problem than changing the chip. I do have tuner cat and a stock bin to look at. I'll help if I can, but I don't have all the answers..................yet!!! Good luck..
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
Originally Posted by Fatt Vette
I am planning on using the Syclone/Typhoon ECM and a '91 Corvette MEMCAL. Anyone out there well versed on making changed to the this chip with the $58 mask? I need to change it from V6 to V8, turn off any fuel cut outs, etc...
Any Thoughts?
Thanks,
Any Thoughts?
Thanks,
I just hacked up the 93 LT1 Da stuff to work with a 2 bar. Lots of things didn't work at first but I managed to fix everything up after about a year worth of playing with it.
2 bar stuff is kinda nice but in alot of ways its a whole new can of worms when it comes down to it.
Pro
Joined: Aug 2004
Posts: 544
Likes: 0
Originally Posted by Alvin
I just hacked up the 93 LT1 Da stuff to work with a 2 bar. Lots of things didn't work at first but I managed to fix everything up after about a year worth of playing with it.
2 bar stuff is kinda nice but in alot of ways its a whole new can of worms when it comes down to it.
2 bar stuff is kinda nice but in alot of ways its a whole new can of worms when it comes down to it.
Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
It works good, i've been driving it for over 2 years like this with both roots and centrifical blowers.
It handles 15psi pretty confortably and has enough resoulution in the VE and spark tables to give 0 problems even with a open loop tune.
It handles 15psi pretty confortably and has enough resoulution in the VE and spark tables to give 0 problems even with a open loop tune.
Pro
Joined: Aug 2004
Posts: 544
Likes: 0
Originally Posted by Alvin
It works good, i've been driving it for over 2 years like this with both roots and centrifical blowers.
It handles 15psi pretty confortably and has enough resoulution in the VE and spark tables to give 0 problems even with a open loop tune.
It handles 15psi pretty confortably and has enough resoulution in the VE and spark tables to give 0 problems even with a open loop tune.
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Drifting
Joined: Nov 2003
Posts: 1,637
Likes: 2
From: Honeoye Ny
We've been using it(2 bar on Da32 mask) on bruce's car, so far there has only been a few quirks. Has anyone gotten datamaster to report the proper Kpa range? Ive gotten it to report correctly in tunercat by editing the tables with the definition file editor, and chaniing the map scalar to provide the proper range, however to get it to run correctly I still have to report the injector flow rate as being half what it really is. anyone else run into this? It works and is only a minor annoyance to me, but Id like to fix it. any ideas?
Last edited by Baldturbofreak; May 2, 2005 at 09:21 AM.
Safety Car
Joined: Dec 1999
Posts: 4,691
Likes: 1
From: Framingham MA
Originally Posted by Blower91
Does anyone know if the $58 code is working with the CCM? If you do the swap, will e.g. the milage calculation still work? Will the ECM do the $F1 poll? Will the DTC reading via the CCM still work? 
Safety Car
Joined: Dec 1999
Posts: 4,691
Likes: 1
From: Framingham MA
Originally Posted by Baldturbofreak
We've been using it(2 bar on Da32 mask) on bruce's car, so far there has only been a few quirks. Has anyone gotten datamaster to report the proper Kpa range? Ive gotten it to report correctly in tunercat by editing the tables with the definition file editor, and chaniing the map scalar to provide the proper range, however to get it to run correctly I still have to report the injector flow rate as being half what it really is. anyone else run into this? It works and is only a minor annoyance to me, but Id like to fix it. any ideas?
Drifting
Joined: Nov 2003
Posts: 1,637
Likes: 2
From: Honeoye Ny
No I don't, The ecm/ mask we're using is the stock 93 lt1 with the Da2 mask. I obtained a hard copy of motorola's opcode. Im going to work harder with the disassembly to find ALL calcs the refer to the map sensor's address and change them. It occasionally does some quirky ship.
So other than adresses of certain functions, I would assume the $58 mask would work in other ecms. Anyone disagree?
So other than adresses of certain functions, I would assume the $58 mask would work in other ecms. Anyone disagree?
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by bigcityvette
Are these computers by GM comparable to the big name brands out there? Bigstuff3, F.A.S.T., Accel DFI, etc? I see bigstuff3 has a ton of features on it.
Drifting
Joined: Nov 2003
Posts: 1,637
Likes: 2
From: Honeoye Ny
For sure! All we have to do is put our collective heads together and write a mask specifically for all our needs- boost. With wastegate control, how bout using say the zr1 ecm and have 16 injector control.
Instructor
Joined: Mar 2005
Posts: 208
Likes: 0
Originally Posted by tjwong
The GM OE computers actually have more control capability than the aftermarket ECMs. But tuning them is a pain as compared the the aftermaket ECMs. The big thing that the aftermarket ECMs give you is the capability to tune them live. You can't do that with a factory ECM. Well you can sorta, with the use of a emulator, but with the aftermarket you can see what cell the ECM is looking at for fuel and timing and other maps as well. The factory ECMs has much more processing power IMHO than the aftermarket stuf not to mention the price and the availability of a factory ECM is much better than a aftermarket.
Cant beat that. Hopefully I can use it in my next project........forced induction.
BTW Tom since you are a supercharger guru feel free to comment on my thread "good start for forced induction"
Im looking for feedback on a supercharger application for 360 c/i sbc.
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
If I could communicate with mine, then I would know that I burned the chip correctly. My cable may not work with the 749 ecm. I don't have a problem burning the chip, but I may not have it all worked out. If you don't have time to experiment, then I can't help. If you still have some time, then I may be able to get mine right and then duplicate it. It has been awhile since I burned mine and I can't remember how big those chips are or where to start the burn. I'll look into it again and let ya know how it goes!
Intermediate
Joined: Apr 2000
Posts: 47
Likes: 0
From: Woodstock IL
Originally Posted by Fatt Vette
Still lookin' for a volunteer to cut me a chip.
Thanks,
Thanks,
http://www.moates.net/fileman/index....Tuning%20Notes
wiring, aldl for tunerpro, xdf for tunerpro and the most important the p4 doc(download it, learn it):
http://www.nwstp.com/
and one of the most comprhensive editors, PROMGRAMMER can be found:
http://www.nwstp.com/tech/default.htm
The v6-to v8 is selectable in the xdf. Egr needs to be disabled(adjust egr enable temp to 255) or patched to run properly with a v8 and there is also a 3 bar patch. Patches can be found www.thirdgen.org use the search function.
Souce code for $58 and $60(32k version) can be found at:
http://www.moates.net/fileman/
165-7730/7749 swap
http://thirdgen.org/techbb2/showthre...hreadid=221968
7730/7749 to 7727 pin conversion
http://www.cruzers.com/~ludis/quadplugecm.html
For individuals who wish to run P/H injectors in a weather pack ecu 1228708(see low z conversion for 7749)
http://www.thirdgen.org/techbb2/show...hreadid=260849
GM 1227749 Mods for Low Z Injectors
http://mywebpages.comcast.net/p-928/749mods.html
Last edited by ED89; Jun 8, 2005 at 11:06 AM.
Race Director
Joined: Dec 1999
Posts: 10,230
Likes: 885
From: Alexandria, Virginia, USA VA
Originally Posted by Baldturbofreak
For sure! All we have to do is put our collective heads together and write a mask specifically for all our needs- boost. With wastegate control, how bout using say the zr1 ecm and have 16 injector control.
I know gm did some test cars like the cerv that had a twin turbo LT5.
staged injectors is pretty cool, and SGC and LPE, Callaway, Mallet, Gieger have all built twin turbo LT5s.
I think with the modern wide band stuff on the XFI and the BS3 (or better still the Motec) that would be the way to go, but you need to also figure out the dash. I would be tempted to run "old school" gauges on such a radical project as they disco danny dash I could do without.
Never had much chance to play with this fancy stuff, only done turbo buicks which are pretty ez as the ecm was designed for boost from the get go.
