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rkreigh · 03-09-2021

not a hp gain I agree. I don't know what the DIS limits are for spark but they are clearly north of 700 hp and a select few ventured beyond that.

My desire is this,

1. easier maint, coil on plug, no spark plug wires or plenum pull
2. better monitoring and tune on the fly with the o2 (and egt if you like) - stock system just doesn't have these inputs. Even with a 12.5 to 1 LT5 get a bad batch of fuel and you can rattle it's brains out. The monitoring and active alerts like chopping fuel, spark or any combination there of based on a bad plug, injector, or coil. Worth it to save some pricey LT5 ponies based on a failure issue.
3. flex fuel. E85 won't gain much if anything on a stock lt5 but up around 12.5 compression or clearly with boost, flex fuel makes sense.
4. twin turbo. the stock ecm for sure can do it (and has) but for all the reasons above I would want the "safe guards" and faster response times.

The C5 has very similar challenges. I'm going to go with a haltech platinum on that project as I've had it laying around for years (bought it then couldn't afford to deploy it) It's "aged out" technology wise compared to new Holley and even the Nexus Haltech, but it's a very capable unit that can do dual WB, 8 channel EGT, and has a driver box control for running an alchy injection pump, and flex fuel sensor ready.

On both my c5s, I boost them till they break (and have broke) and try to just build stronger next go.

FYSA the new iron block truck motors with a stock block have gone past 2000 hp so the ICE might be on last legs, but they are stout ones.

03-09-2021	#5
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,080	Re: Megasquirt? What's the Situation? not a hp gain I agree. I don't know what the DIS limits are for spark but they are clearly north of 700 hp and a select few ventured beyond that. My desire is this, 1. easier maint, coil on plug, no spark plug wires or plenum pull 2. better monitoring and tune on the fly with the o2 (and egt if you like) - stock system just doesn't have these inputs. Even with a 12.5 to 1 LT5 get a bad batch of fuel and you can rattle it's brains out. The monitoring and active alerts like chopping fuel, spark or any combination there of based on a bad plug, injector, or coil. Worth it to save some pricey LT5 ponies based on a failure issue. 3. flex fuel. E85 won't gain much if anything on a stock lt5 but up around 12.5 compression or clearly with boost, flex fuel makes sense. 4. twin turbo. the stock ecm for sure can do it (and has) but for all the reasons above I would want the "safe guards" and faster response times. The C5 has very similar challenges. I'm going to go with a haltech platinum on that project as I've had it laying around for years (bought it then couldn't afford to deploy it) It's "aged out" technology wise compared to new Holley and even the Nexus Haltech, but it's a very capable unit that can do dual WB, 8 channel EGT, and has a driver box control for running an alchy injection pump, and flex fuel sensor ready. On both my c5s, I boost them till they break (and have broke) and try to just build stronger next go. FYSA the new iron block truck motors with a stock block have gone past 2000 hp so the ICE might be on last legs, but they are stout ones.