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Old 07-12-2017, 05:38 PM   #1
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Mystery LS1

hello I am new here
I have a 2002 35th aneversery addition Camaro # 138 destined for Canada, it was built in n6vember of 2001.
the mystery comes from the fact it is a hybred of various enginss
it has the 345 hp kit.
at 3/8 gas it will run to 6200 like a lS6, I am not going to knock the ls1 but NO engine I know of will hit 50 mph in under 1n around 120 feet. it is comparable at 3/8 thoutlel to a v10 powered bmw.
the history goes likes this I ordered it from Winnipeg dealership who got it dropped shipped from Edmonton mortors where it was orginal ordered.
both SLP and gm go way out to deny this car.
yes the heads are 241
has any one any ideas?
thanks
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Old 07-12-2017, 10:54 PM   #2
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re: Mystery LS1

Hi!

Your post isn't very clear, but I think you're saying that you give the car less than half throttle (3/8) and it goes like you floored it? And maybe even faster than you think a stock LS1 Camaro should? Have you ever taken it to a track to get a real timeslip? Measured the power on a dyno? Used one of those accelerometer apps on your smartphone to measure a rough 0-60 time? Some sort of real data would be helpful.

All that at half throttle -- what does it do when you floor it?

Last edited by JakeRobb; 07-12-2017 at 11:22 PM.
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Old 07-13-2017, 01:02 AM   #3
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Re: Mystery LS1

I will try to put it on a dyno
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Old 07-13-2017, 01:05 AM   #4
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Re: Mystery LS1

the engine has high rpm fuel starvation
by the way, where is the fuel filter on that car.
it appears the ecm is locked
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Old 07-13-2017, 10:33 AM   #5
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Re: Mystery LS1

PLEASE USE THIS THREAD. If you delete it again, we will not reopen this one. PLEASE.

The other thread CLEARLY said it was going to be closed.
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Old 07-13-2017, 10:50 AM   #6
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Re: Mystery LS1

Now to deal with the topic.... why do you say "it is a hybred (hybrid) of various enginss (engines)". The SS package upgrade was 335 or 345 HP/350 lb-ft torque, as you indicate yours is. The LS1 had 241 heads, the LS6 had 243 heads. What components of your engine came from some other engine?
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Old 07-14-2017, 08:14 AM   #7
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Re: Mystery LS1

How do you know there is high RPM fuel starvation? How do you know the ECM is "locked", and what does that mean?

The fuel filter is just in front of the rear left wheel, inside the subframe. There are good pictures and instructions here: Fuel Filter Replacement
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Old 07-14-2017, 09:06 AM   #8
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Re: Mystery LS1

the long block I believe is ls6 heads 241 . cam is different. the ECM is locked. I did live streaming of the ECM an the reading was not adapting to fuel table. eg had a bunch of bad gas and when reading the ecm live amoust many things it said it was 23% lean but did not correct the problem. It should of richened the mixeter to meet the fuel table. at -23% the nitros oxide would be through roof. under full power it fall on it face and quients down.
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Old 07-14-2017, 09:08 AM   #9
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Re: Mystery LS1

THANKS for the info on the fuel filter
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Old 07-14-2017, 01:21 PM   #10
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Re: Mystery LS1

In 2002, some LS1's in the F-Body got the LS6 block, which just has larger windows in the webs between the cylinders. Some of them also got the LS6 intake manifold. GM was cleaning out the F-Body inventory and using random Corvette parts, since the Camaro was soon to be discontinued. Everything I have seen indicates the 241 heads were used on the LS1. LS6 heads are 243.

Most scanners report an average LTFT as a %. -23% would indicate the PCM is pulling out 23% of the fuel to correct a rich condition. You would have to look at the LTFT's for the individual "Cells" to see the LTFT (left and right) for that Cell.

-23% doesn't mean its running lean. If it was, why worry about NOx.... you would have massive detonation if the PCM was NOT correcting for running 23% lean = 18.1:1 A/F ratio. It means it would be running rich if the LTFT's weren't pulling out 23% of the fuel. I am surprised to see a -23%. But that could be peculiar to the LS1. In the LT1, the max subtraction of fuel is -15% (108/128 - 1 = -0.156)

How do you know "the cam is different"?

And just curious.... you've owned this car for 15 years, and only put 6,500 kM on it. And while you feel it has some sort of exceptional power output just at part throttle, you never ran a 0-60? Never took it to the track? Never ran it against a similar LS1/SS model?

Are you familiar with the modifications made by independent shops like GMMG/Berger? Could it possibly one of their builds?
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Old 07-14-2017, 02:47 PM   #11
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Re: Mystery LS1

I has the LS6 intake, I a friend find #s
no proof but the block is as I said is most likey LS6
the Engine shakes at idle
and YES I had a firebird 2002 owner look at the engine and listen and said they are not the same.
he had headers and matching exhaust BTW , and mine was stock.
his you could balance a coin on . that is only a dream on mine.
YES I agree it could be a berger or gmmp but that why I am here both gm and slp deny it
and thanks for your info, it is nice to chat with someone who know something.
and 1 other thing how many people knew about that the car date of birth was november1 2001.but the black wing and the 345 hp kit was available in November 1.2001
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Old 07-14-2017, 05:58 PM   #12
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Re: Mystery LS1

Give me the casting number on the block and I'll tell you if it's an LS6. I'll repeat again.... the LS6 block was used randomly in 2001-2002 to build LS1 engines. There is no magic about an LS6 block. The web vents reduce crankcase pressure at very high RPM.

GMMG (who did the Berger, Tom Henry, Earnhardt Intimidator, etc conversions) has nothing to do with GM or SLP. You would have to check w/ GMMG in Marietta, GA.

http://gmmginc.net/media/Press/Camar...s_Sept2006.pdf
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Old 07-14-2017, 10:26 PM   #13
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Re: Mystery LS1

I tried to find the casting # where is it please.
bare with me I am 58 years old and this is the first forum I ever been on, so I am learning as I go on.
I do not know how to word this , my experience has taught me that a engine that likes to run will have a bark to it, in fact slowly rev it up in newtral will show a lot of things,
1 torque peak . it will have a loud bark to the exaust when you hit the peak and as u go faster the bark softens as the torque drop,
this will show how well the combination works.
mine is loudest at 4800-5000.
question would not larger injectors cause the ecm pull fuel back?
a friend said I had LS6 injectors, he had just put the larger injectors in his car so I believe him
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Old 07-15-2017, 07:32 AM   #14
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Re: Mystery LS1

I think you'll find the casting number below the rear of the driver's side head.

If you can't see it from above, you might have to view it from under the car.
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Old 07-15-2017, 07:38 AM   #15
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Re: Mystery LS1

thanks
yes 26 mpg is very good
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