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Old 09-18-2013, 11:26 AM   #1
FrankieV
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Default Lighting off MS109 fuel turbo LS1 camaro

Over the weekend, I tried using our MSD boost controller to add some boost and also added 5 gallons of VP MS109 unleaded race fuel to 2 gallons of 93 to keep the tune safe, usually we use the same mix of 2 gallons 93 with 110 leaded turbo blue. With turbo blue it keeps killing the O2's but runs great for a few weeks. Now with the MS109 mix, the car is having a hard time lighting off the fuel mix.

I disconnected the boost controller and 2 step, no change. Injector duty cycle is usually 1.7ms on pump gas, it's now 2.46ms with the 109. T/P, Map, ect and IAT are all reading correctly. The wide band is always reading lean. The car runs open loop at idle, tuned with HP tuners using speed density. I think we just don't have enough ignition to light off the fuel on this tune so I drained the tank and filled with 93 pump and it runs normal again. Were running stock processor/ignition, NGK 9's gap'd .040, would tightening gap help or do we need to upgrade the ignition system to run this fuel mix.

I could use some advice.

400", PT88, 160lbs injectors, MSD boost controller and a snow meth kit
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Old 09-18-2013, 11:40 AM   #2
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

.040 gap is huge with any amount of boost. Start by cutting that in half and if .020" still has some misfires you can go as tight as .016 or so. If you are just fighting weak coils this wail help but if I was going to push it hard I would swap over to a set of truck coils as they are the most powerful stockers. Gap should make a big difference.
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Old 09-18-2013, 11:57 AM   #3
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

Would it be worth going to say an MSD coil set? We will be pushing the combo in the near future.
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Old 09-18-2013, 12:08 PM   #4
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

I interchange MS109 with pump, with very little tuneup changes. It's a great sub 1000 hp fuel for cars with narrow band oxygen sensors.
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Old 09-18-2013, 12:10 PM   #5
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

What's compression? A 9 plug is cold. I'd run gap down to 25/28 and see.

I run all my ZR1 customers on it, with 20/22 psi and 9:1 compression with a 7 or 8 plug dependant on the use of the car.
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Old 09-18-2013, 12:17 PM   #6
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

It's 10:1, 11 psi on the spring and can take it as high as 22 on the controller.
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Old 09-18-2013, 01:43 PM   #7
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

Kurt Urban built the first LS to go in the 6.xi's launching with 25psi and a 150 shot using stock coils so think it will be ok.
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Old 09-18-2013, 02:05 PM   #8
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

Thanks guys!
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Old 09-18-2013, 05:13 PM   #9
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

Bring your gap down to .25-30
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Old 09-18-2013, 08:10 PM   #10
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

As others have said, the gap is the whole of the problem. No benefits to wide gaps unless you like spark blowout.
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Old 09-18-2013, 08:12 PM   #11
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

Quote:
Originally Posted by FrankieV View Post
Would it be worth going to say an MSD coil set? We will be pushing the combo in the near future.
Not worth the money. Get the truck coils with the heat sinks on the back of them... Then just adjust your dwell times and what not to get them to run optimally.
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Old 09-18-2013, 11:08 PM   #12
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

You might be having a hard time if it's lean. Wideband says it's lean, and is if you didn't any fuel. Stooch for that fel is 1:.4, you you need to richen it up. It can smusually take 6-10 deg than pump.
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Old 09-18-2013, 11:25 PM   #13
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

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Originally Posted by b00sted View Post
Not worth the money. Get the truck coils with the heat sinks on the back of them... Then just adjust your dwell times and what not to get them to run optimally.
Ask Kurt Urban about the Delphi coil. He's not such a fan. FWIW, we have run the factory equipment LS1 coils up to 900 dyno verified wheel horsepower and enough steam to make a 3700 lb car run 5.8s @ 121 on the track. Not the fastest thing out there, but the LS1 coils never batted an eyelash.
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Last edited by deadhorse66; 09-18-2013 at 11:27 PM.
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Old 09-18-2013, 11:33 PM   #14
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Default Re: Lighting off MS109 fuel turbo LS1 camaro

Rick @ Firecore just released some hot LS coils. You might look into them. Also, drop the gap down to 16 and see if clears up. The wideband will read lean when the spark blows out.
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