Which ECM/PCM for boost and why
07-17-2015, 07:51 AM
#1
Which ECM/PCM for boost and why Im planning a ground up build in the near future and the control system is up in the air. From a tuning perspective, which would be preferred for a forced induction build: GEN III PCM vs E67? What benefits would one have over the other?
So far the best I can come up with is DBC vs DBW
Planning a 408 with a TVS1900 at +18psi through a manual trans of some sort. Expecting 8-850. I will be custom building the harness so wiring it in isnt an issue
So far the best I can come up with is DBC vs DBW
Planning a 408 with a TVS1900 at +18psi through a manual trans of some sort. Expecting 8-850. I will be custom building the harness so wiring it in isnt an issue
07-22-2015, 05:59 PM
#4
TECH Senior Member
GenIII has some boost limitations: IFR does not cover boost range (ok so you can run a boost-referenced FPR), VE and OLFA tables do not cover boost range (ok so you can scale).
HPTuners and EFILive provided custom operating systems (COS) for some GenIII PCM's/OS's that provided boost tables (so you didn't have to scale anything).
GenIV OS's already have boost tables (even if they are not used; you have to populate them).
HPTuners and EFILive provided custom operating systems (COS) for some GenIII PCM's/OS's that provided boost tables (so you didn't have to scale anything).
GenIV OS's already have boost tables (even if they are not used; you have to populate them).
07-22-2015, 06:00 PM
#5
TECH Senior Member
Also note that if you are contemplating running a GenIII engine from a GenIV ECM you will need to either replace the CKP/CMP reluctors or use the LPE converter.
If you are running a GenIII engine then I suggest running a GenIII PCM with an OS that HPTuners or EFILive supports with a COS.
If you are running a GenIII engine then I suggest running a GenIII PCM with an OS that HPTuners or EFILive supports with a COS.
07-23-2015, 02:08 AM
#7
Also note that if you are contemplating running a GenIII engine from a GenIV ECM you will need to either replace the CKP/CMP reluctors or use the LPE converter.
If you are running a GenIII engine then I suggest running a GenIII PCM with an OS that HPTuners or EFILive supports with a COS.
If you are running a GenIII engine then I suggest running a GenIII PCM with an OS that HPTuners or EFILive supports with a COS.
Why not a Holley HP?
Andrew
Andrew
Im building the harness, so add the materials, plus blank ECM plus a couple dyno tunes still wont touch the cost of a holley ECM. Ive read quite a bit on how Holley ECMs blow OEM computers out of the water, but the cost is still quite steep. That and Id have to custom build that harness too, so even more expense
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07-23-2015, 02:50 AM
#8
TECH Senior Member
Which ECM/PCM for boost and why Correction to my post above (sorry my mistake): the LPE converter is for running a GenIV engine from a GenIII PCM, and not vice-versa as I had said above.
07-23-2015, 10:03 AM
#9
TECH Senior Member
iTrader: (7)
Its a clean sheet build, can order either a 24x or 58x crank and the timing sprocket is a simple swap. Ive been itching to do a GEN IV conversion to nail down all the details, just wasnt sure if the benefits of the ECM would make it worth the extra steps for a conversion. Guess its time to grab an E67 ECM and get busy
Cost
Im building the harness, so add the materials, plus blank ECM plus a couple dyno tunes still wont touch the cost of a holley ECM. Ive read quite a bit on how Holley ECMs blow OEM computers out of the water, but the cost is still quite steep. That and Id have to custom build that harness too, so even more expense
Cost
Im building the harness, so add the materials, plus blank ECM plus a couple dyno tunes still wont touch the cost of a holley ECM. Ive read quite a bit on how Holley ECMs blow OEM computers out of the water, but the cost is still quite steep. That and Id have to custom build that harness too, so even more expense
Andrew
07-24-2015, 01:03 AM
#10
TECH Senior Member
Which ECM/PCM for boost and why The Holley system uses a wideband to continously trim fueling thru out the operating range, this is a nig advantage over the GM PCM/ECM...
however, the GM PCM/ECM does have far better engine protection mechanisms/failsafes that the Holley does not.
And it also provides for the various emissions systems/functions (which obviously you do not need).
however, the GM PCM/ECM does have far better engine protection mechanisms/failsafes that the Holley does not.
And it also provides for the various emissions systems/functions (which obviously you do not need).
07-24-2015, 10:49 AM
#12
TECH Senior Member
The GM PCM has tables for engine protection (overheating), piston protection (high load for extended time), catalyst overtemp protection, HO/LO adaptive ignition timing (knock detected), safe fueling selection (LTFT applied on top of richest of active tables)... I am not aware of the Holley system having these.
08-01-2015, 03:54 PM
#13
Fair enough, E67 wins
Does Holley make a LSA harness? Do they make one for 3rd gen Fbodys? I do, so Id be making that aspect. Choosing which ECM/PCM to control it is required before building the harness and assembling the engine
Why would you have to build a harness for the HP?
08-01-2015, 10:11 PM
#14
TECH Senior Member
iTrader: (7)
As far as tuning a boosted engine, you can't beat the options that the HP will give you compared to a E67.
Andrew