I have been having issues and some hesitation at 4000 RPM with my LS1 twin turbo setup in my Silverado. So I am searching for more spark, and after reading for hours on this site, I am still a little confused.......Has anyone tried using the MSD LS2 multiple spark coils on a LS1? What harness did you use, and any issues with compatability of connectors?

Also, thinking about just going the stock LS2 GM coil route(for a truck LS1 remember), can someone offer help getting the truck coil and harness part numbers to take the the Chevrolet dealership?

Thank you big time!

 

Unless you are making 1500hp+ you should not have issues with the stock ignition system. I would not touch an MSD coil. Which spark plugs are you using? Plug gap?

 

Hi, our coils should work fine, there are four LS versions that could be fitted on your engine.
I would like to know the one you have on your truck ?
The "sub" harness could need a change as the LS-1/LS-2 connectors are of different size/pin-outs.
The max boost I state is 15-16 though reports of 22, with "closed gap", are common.
The coil you have is a 58mj energy output, my guess of your fitted item.

My IGN-1A coil is the most powerful choice, the choice of Andy Frost "Red Victor" @ 55 .lbs, a Meth fed head.

Your comment of "hesitation" is most likely from another cause, though to "OPEN" the plug gap as suggested above, would be a good choice.

Would you be able to better describe your problem ?

Lance

 

I called NGK and they recommended .30-.35. Im using TR-6 Plugs. So I gapped and finished the twin turbo build and sent it off to the Dyno. Oh ya, I have a 2000 silverado LS1 4x4. On the dyno the engine was breaking up at 3500 RPM. So they gapped all but one plug that would require pulling the exaust manifold off. They redynoed and it made 400 tq to the ground 350HP. The tuner said intermittently it would break up around 4500 RPM. he made three pulls to tune it. So when I got home pulled the exaust and gapped the one plug to .20 like all the rest that the tuner did. Truck runs good for a little bit then I start seeing the hesitation around 4000 RPM as it climbs the RPM. So I called Reggie at turbonetics to ask him about why the boost doesnt come on until 3000 RPM and seemingly sluggish spool up, and he said I must have a leak because the twin turbo setup I have should spool instantly, almost, and should be up another 100 HP. So I pressure tested the system found a couple leaks, fixed them. Repressure tested using a leakdown guage and found out that the turbos are dumping a good amount of air down the oil return line and escaping from the vacuum line of my catch can. WTF! Now when I drive in 2nd gear and floor it it doesn't start to boost until 2000 RPM and you dont feel it in the seat of your pants until 3000 RPM. Then Watching the boost gauge it goes up to 9 then falls to 6 until I run out of gear, switch to third and same thing, sluggish spool up and then boost up and down. I use turbosmart internal wastegate and BOV, switched to heavier springs on both. No difference in boost performance and still sometimes some hesitation at 4000 RPM followed by a P0300 trouble code for a random misfire. So I hooked up my in cab Boost-T boost controller and it moves the boost up but still initially but still falls a couple pounds every time.

I have done pressure testing on everything, Soap and watered a river acrosse the engine to find leaks, and yes i have check valves on my vibrant performance catch can installed exactly as instructed. This build has fought me every step of the way. So I want to try to get more spark, which "Megasquirt" claims the LS2 coil puts out 80 more Milijules than the LS1 hope that would solve the misfire codes and hesitation. I am stumped why air is blowing out the oil return and how to fix that and fix being down on power.....

 

Did you swap an actual LS1 into your truck?
Do you have heatsink coils?

 

Truck came with the LS1 when I bought it brand new in 2000. It doesn't have the heatsink coils

 

The truck likely came with an LM7, not an LS1. The LS1 was never offered in the trucks (unless you're from Australia). Grab heatsink coils...

 

JoeNova, what is the difference? My block is cast with aluminium heads. Everything for an LS fit on my truck....Is the difference of a LM7 has a cast iron block? I have taken it to different Mechanics and they never mentioned a LM7???? ALL the parts I ever bought are for an LS1 from Summit, Rock Auto, ect ect.

 

LS1 is an aluminum 5.7. The LS equipped trucks in 2000 were only available with a 4.8, 5.3, 6.0. All were iron blocks. The most common were: LR4 is the 4.8, LM7 is the 5.3, LQ4 is the 6.0.

99% of the parts are interchangeable, but it does determine what the truck came with from the start. LS1s did not have heatsink coils, where as the trucks in 2000 were available with them. That's why I asked.

 

I guess it an LR4 then. But never came with heat sink coils thought!

 

Is the LR4 coil harness the same as an LS1? Yhe reason I got the 4.8 is because chevy only offered a manual trans with a 4.8 motor, no othe engine. The old coils were flat like pancakes 12558693. I bought the MSD blaster coils and noticed a little more pep before went turbo.

 

GM offered a manual trans with the 4.8, 5.3, 5.7, 6.0, 6.2, 7.0 (Every LS engine size lol).

The stock heatsink coils outperform those overpriced MSD coils. They might even be causing your issue.

 

Yea i am kind of erring to that MSD coils could be part of my problem. And contrary, in 2000 I went to the dealership and asked to order a half ton with the biggest engine they offered, and they said the only engine in a half ton size with a manual trans was a 4.8. So I went to another dealership to see if they were bullshitting me, and the other dealer said the same thing EVEN if I special order......I dont know about any other year, but that year in 2000, that was it! 4.8 manual trans.