Just when you get used to one technology... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BR3W CITY · 01-30-2016, 09:06 PM

...you have to start messing with the other ones.

I was starting to feel pretty solid in my understanding of the GenIII Ecm. I messed with a handful of GenIV, and for the most part its not insanely different...but little things like GMVE instead of standard VE threw me.

Then the GenV motors came out, and it was a paradigm shift again. Sure the concepts are the same, but man some of the little stuff gets weird. Messing with the DI systems is downright scary, and their secondary high pressure pumps are specific in what they like (and they aren't cheap if you mess them up...and yes, you can kill them with a tune).
The beauty of GM is that at least you can "downgrade" your GenV to run GenIV topend, and tune it using the older system. Sounds crazy to buy a 60k+ camaro or vette and then put older stuff on it, but I'm seeing a large amount of guys do so because of the lack (and cost) of parts that can take advantage of the DI.

Now I feel old for complaining about tech. /rant

slotard · 01-31-2016, 01:51 AM

Do you have to swap to GenIII/GenIV heads if you want to run normal EFI?

Cobalt964ruf · 01-31-2016, 02:59 AM

i did not realize gen4 heads would bolt on to a gen5

slotard · 01-31-2016, 02:53 PM

I don't know that they will, I was just thinking that with the DI stuff on them GenV heads might not work for normal EFI.

BR3W CITY · 01-31-2016, 03:42 PM

My understanding is that their blocking the DI ports, ditching the pump, then using a fabbed manifold and older ECM system to run port injection. I didn't build nor tune them, only got to start at them on a dyno.

I'll text the tuner this afternoon and see if he's got an actual explanation.

01-30-2016, 09:06 PM	#1
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Just when you get used to one technology... ...you have to start messing with the other ones. I was starting to feel pretty solid in my understanding of the GenIII Ecm. I messed with a handful of GenIV, and for the most part its not insanely different...but little things like GMVE instead of standard VE threw me. Then the GenV motors came out, and it was a paradigm shift again. Sure the concepts are the same, but man some of the little stuff gets weird. Messing with the DI systems is downright scary, and their secondary high pressure pumps are specific in what they like (and they aren't cheap if you mess them up...and yes, you can kill them with a tune). The beauty of GM is that at least you can "downgrade" your GenV to run GenIV topend, and tune it using the older system. Sounds crazy to buy a 60k+ camaro or vette and then put older stuff on it, but I'm seeing a large amount of guys do so because of the lack (and cost) of parts that can take advantage of the DI. Now I feel old for complaining about tech. /rant __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

01-31-2016, 01:51 AM	#2
slotard Registered User Join Date: Nov 2014 Location: Alameda, CA Posts: 877	Re: Just when you get used to one technology... Do you have to swap to GenIII/GenIV heads if you want to run normal EFI? __________________ 1973 C20, 350/350

01-31-2016, 02:59 AM	#3
Cobalt964ruf Registered User Join Date: Jun 2014 Location: Piedmont, OK Posts: 364	Re: Just when you get used to one technology... i did not realize gen4 heads would bolt on to a gen5 __________________ 1971 K30 burb carbed LS6 th400 np205 d70f 14bff 4whl discs lifted 35 bfg's 1994 k3500 rcsb trophy truck ls427 4l85e bw4401 9.25ifs 14bff g80 35 bfg's 1998 K3500 rclb ls427 4l85e bw4401 9.25ifs 14bff g80 35 bfg's 1999 k3500 crewcab dually 4x4 496ci 4l85e bw4401 9.25ifs 14bff g80 6" lift 37 bfg's

01-31-2016, 02:53 PM	#4
slotard Registered User Join Date: Nov 2014 Location: Alameda, CA Posts: 877	Re: Just when you get used to one technology... I don't know that they will, I was just thinking that with the DI stuff on them GenV heads might not work for normal EFI. __________________ 1973 C20, 350/350

01-31-2016, 03:42 PM	#5
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Just when you get used to one technology... My understanding is that their blocking the DI ports, ditching the pump, then using a fabbed manifold and older ECM system to run port injection. I didn't build nor tune them, only got to start at them on a dyno. I'll text the tuner this afternoon and see if he's got an actual explanation. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD



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