EFI ECM systems - Chevy Impala SS Forum
 
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post #1 of 10 (permalink) Old 06-03-2017, 10:27 PM Thread Starter
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EFI ECM systems

My set up is a 550-600hp 383.


I'm currently running an Accel DFI system. Its pretty ancient and no one supports it anymore. Have idle issues and I just don't think I'm getting all the power out of the engine. I run the transmission through a TCI program.




I've been looking at Holley, Fast and Torqhead. All have their +/-. I don't know if I want to stay with the opti or go to 24x.


I'm trying to stay around a $1500 budget but it looks like any way I go its going to cost $2500-$3K to go 24x.


What set up have you guys had good luck with?


Thanks!
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post #2 of 10 (permalink) Old 06-04-2017, 02:54 AM
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My 2 cents would be for Torqhead. Mainly because I assume the other options you're looking at still use the opti. While I have nothing against the opti itself, the problem is you can't get good replacements anymore should it fail. Nobody uses the good Mitsubishi optical sensor anymore, because they won't make them unless someone orders a huge batch of like 50k units minimum. The Torqhead system isn't on any of my vehicles yet, but the first one is ordered, just working out details of a version specific to the Fleetwood. The guy who makes them wasn't aware that the D-body had a few differences from the B-body and is willing to make another version of his setup, thus covering all LT1 equipped vehicles. That and the easy tuning of an LS pcm these days, you can literally go anywhere that does tuning and they can take care of you. Whereas not every tuner would necessarily be able to tune Holley or Fast or etc, etc.

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post #3 of 10 (permalink) Old 06-04-2017, 09:33 AM Thread Starter
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One of my problems is that I don't have the stock wiring harness. So in order to run the torqhead system I'd have to get one and figure out what all is missing from my car.


My solution is to get the Torqhead signal kit and run the LSX Holley HP ECM. The Holley system they sell is around $1700 for the LSX that comes with the wiring harness. Then another $700 for the Torqhead signal kit plus another $500 for the Torqhead coils kit. Or I could possibly make my own coil kit and save a few bucks. But it all adds up to big $$ any way I go. Unless I fabricate a 24x trigger, etc...


The good thing about the Holley is its a little easier to program than a LS1 ECM and will self learn. Any good shop will tune Holley. Many LS guys are running the Holley system now.


idk....just kind of overwhelming. Or I just suck it up and make the DFI system work. lol
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post #4 of 10 (permalink) Old 06-05-2017, 01:42 AM
TGO
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Why don't you have the stock wiring harness?

What mods do you have to your car?

Why can't you just pick up a stock wiring harness and use the torquehead kit?

Going forward...it's really the only reliable plug and play option.

Next year I hope to have one installed on my car. I have a few things I need to have taken care of this season first.
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post #5 of 10 (permalink) Old 06-05-2017, 10:16 AM
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The Holley system does not come with injectors, so add another $350 to the tab.

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post #6 of 10 (permalink) Old 06-05-2017, 10:55 AM
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Personally, I'd probably grab the EFI Connection timing cover setup and roll my own harness for an LSx PCM. This would allow me to take advantage of the OE parts availability/durability and access a huge network of LSx tuning knowledge.


Quote:
Originally Posted by schlicky13 View Post
...I assume the other options you're looking at still use the opti.
The modern aftermarket systems can run individual coil ignition like you'd find on a LSx or other current production vehicle. They just need a cam and crank signal, as would be outputted by the Optispark-delete timing cover setups from EFI Connection or Torqhead.

Really no reason to stick with the Optispark anymore unless its budgetary.

Quote:
Originally Posted by TGO View Post
Why don't you have the stock wiring harness?
I'd wager it's because he switched to the Accel DFI system previously, and had no need to keep the stock engine harness.


Quote:
Originally Posted by TGO View Post
Why can't you just pick up a stock wiring harness and use the torquehead kit?

Going forward...it's really the only reliable plug and play option.
If I were going through the effort of re-wiring the engine bay of an SS, I'd want to start with fresh wire that hasn't been exposed to 21+ years of heat and environmental exposure. At that point, why duplicate the stock harness?

He's likely beyond the point of 100% plug-and-play being a necessity. Either wire it with an aftermarket ECM harness, or fabricate one for an off-the-shelf LSx PCM. It makes no sense for him to saddle himself with the Torqhead-specific modified LSx hardware.

Quote:
Originally Posted by Fred Kiehl View Post
The Holley system does not come with injectors, so add another $350 to the tab.
None of the "universal" systems or those intended for retrofit on an OE multi-port injected engine come with injectors since they'd be dependent upon the engine's requirements. He should be able to re-use his current ones; no need to change them if they're sized appropriately.

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post #7 of 10 (permalink) Old 06-05-2017, 04:19 PM
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I did an EFI Connection 24x. Modding my existing harness, snagged a partial 04 Silverado Harness for $40 to get the coil harnesses and connectors, J/Y PCM and Coils and some custom Magnecore wires. Not including HP Tuners I've probably got ~$1000 in my set up.

Would I love to have a Holley system? Yes. Could I afford it? Not at the time. Am I happy with my 24x. Of course. It's much easier to tune quickly vs the OBD1 and has performed flawlessly.

I also personally like how the EFI connection has the sensor wheel under the timing cover. I know may have used the external without issues but why tempt it, especially on my lowered machine.

I will most likely be converting my dad to 24x when it comes time to refresh his LT1.

-Brian

'95 B4U LT1/T56 in Purple Pearl. 24x 355 with I believe most of the bolt-ons.
'63 C10 LT1/4L60E from B-Body. Rides like a Cadillac thanks to air bags.
'06 GTO LS2/T56 Torrid Red with CAI and Borla Cat-back thanks to the lady who rear ended me.
Still in Wichita.
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post #8 of 10 (permalink) Old 06-12-2017, 06:59 AM
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I wasn't aware that you weren't working with a stock harness in place, that would obviously change things. The only thing I would add is that if you do decide to ditch the opti, when deciding between the crank sensor setup made by EFI Connection and Torqhead, get the Torqhead. No question about it, it's by far the superior unit. Paul has a lot of info on his website about why his unit is as good as the best OEM, and just plain better than everything else on the aftermarket. He's literally using the best (and as a result most expensive) trigger that GM makes and thus he's got the only aftermarket unit using a dual track 24x crank sensor.

You can buy just the signal kit by itself, since you're obviously not dealing with a normal, stock setup. The Torqhead unit is also a lot easier to work with in terms of timing covers and timing chains, the EFI Connection stuff still had the same obstacles LT1s always had, and if you have an OBD1 model it also requires that you switch to the later, OBD2 version of the timing cover. From there though you're sort of on your own as far as what system you want controlling everything.

The FAQ section at Torqhead is worth perusing as well, it answered nearly every question I had before I decided on ordering.

FREQUENTLY ASKED QUESTIONS - TORQHEAD LTD

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post #9 of 10 (permalink) Old 06-12-2017, 08:48 PM
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Just checked my Amazon history, the GM10456248 is the exact same sensor my EFI 24x set is running.

-Brian

'95 B4U LT1/T56 in Purple Pearl. 24x 355 with I believe most of the bolt-ons.
'63 C10 LT1/4L60E from B-Body. Rides like a Cadillac thanks to air bags.
'06 GTO LS2/T56 Torrid Red with CAI and Borla Cat-back thanks to the lady who rear ended me.
Still in Wichita.
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post #10 of 10 (permalink) Old 06-12-2017, 09:53 PM Thread Starter
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Not having the stock harness defiantly complicated it a bit. Right now I'm leaning towards the torqhead for the trigger. As far at the PCM I'm really not sure yet.


Ideally I'd like the combination of the Torqhead trigger with the Holley system. The only thing holding me back is the price. Right now I just cant swing it.


I think for this summer I'm going to stick with the DFI system. The major problem I am having is the idle control. Perhaps a little more investigation on the cause of the problem will help me at least get it running decent enough until I have the funds for the 24x.
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