Got a 1995 LT1 with no cat and cai, going to do plugs tomorrow and was wondering what the best plug to put in there was? I think I put ACDelco's in there last time.

I can probably only get high end plugs like NGK's from a racing shop, but that is an option. I would, however, rather get some plugs from somewhere like Autozone or O'reillys.

Thanks,
James

 

NGK TR55's gapped @ .050"

 

Ditto and the TR55's are badass plugs.

 

man, NGK is cool..... but you know what? stick with what was meant to be in that motor! nobody knows that chevy like AC delco... get some rapidfires for it and gap it at .40 - .45.... i would say .50, and u can do that, but i wouldnt go to .50 until you were running some high output ignition, just because you have a higher chance to foul out the plug... JMHO

 

Plug choice is personal preference. I run the TR6s in my TA (blown car), but the TR55's are a nice plug. You may even want to give the new iridium (sp?) plugs a try if you have some spare $$. I'd gap them at the stock .050 setting and call it a day.

 

stock is .50? damn..... guess these motors really DO differ from the usual... i have built MANY sports cars, usually old schools, i had a 69 camaro SS, 2 79 Z28s, an 84 Z28, a 92 RS 25th anniv., and a 2001 v6 droptop (which i never really did much with) aside from camaros i had a '72 nova, a 94 regal GS custom, and a 79 monte carlo. i re built the 69 ss, the 72 nova, the 92 RS, and the 79 monte from the ground up. and for the most part all the older V8s were gapped at .045... i always thought .050 or .055 would be pushin the limits of a stock ignition system... but i guess not with this motor. can someone explain to me how the ignition module on the front of the LT1 block works!?!? that is stumping the hell outta me.

 

What don't you understand about the ignition module?

 

like, what hits what that tells what to fire what? ya know? lol

 

Huh?

Ok, lets see if I can remember LT1 ignition 101...

The opti uses a high and low res pulse to tell the computer what postion the cam is in and the computer uses this information to figure out which cylinder it needs to fire and which one it needs to add fuel to. The computer barks its orders to the ignition module about how many degrees to advance or retard the timing. The ignition module triggers the coil which fires and sends the spark through the opti, along the plug wires and across the plugs. Or something like that.

 

Simply....


The LT-1 ignition system Blows.

1. Worse location known to man

2. Prone to failure

3. It's costly to go around it

 

Everything has pros and cons.

Yeah, the distributor under the water pump sucks, but it's extremely accurate and you never have to find TDC to install a distributor like you do with a Gen 1 motor. The opti can also spin up to 7000 RPM and still provide accurate timing. It'll go to 7k+ if you combine it with an LTCC or Delteq ignition.

The opti is actually quite duarable if you seal it up really well before you install it. Also, if you keep an eye on the water pump and replace it when it starts to leak you shouldn't have any problems out of the opti. Also, avoiding standing water and not pressure washing your engine are good ideas as well.

What do you mean it's costly to "go around it"?

 

I was talking about the aftermarket Ignition kits that "try" to elimnate the opti.


Although I like my optispark... survived coolant, a Flood, and works well with the MSD... so I'm happy.... for now... till we get wet again.

 

Still having trouble seeing your point. Check with Elite Spark Plugs (vendor) if you're interested in a true aftermarket ignition setup. They can set you up with the Delteq kit for under $600 bucks.

Part#102-9011: $595.95
Opti-Direct System for 1993-1997 LT1/LT4
Camaro/Firebird.

It's really a great system. Just plug it in and go.

 

high and low res pulse: Can someone explain this in more detail? I was getting a code for Low res pulse or something, but dont really understand what these mean.