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02 LS1 For a GTM Mulsanne Kit Car

This is a discussion on 02 LS1 For a GTM Mulsanne Kit Car within the Internal Engine forums, part of the LSx Technical Help Section category; I am building a FFR GTM Kit car Website - factoryfive.com/table/ffrkits/GTM/GTMkit.html The kit calls for a 97-04 C5 donor car, ...

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    Smile 02 LS1 For a GTM Mulsanne Kit Car

    I am building a FFR GTM Kit car

    Website - factoryfive.com/table/ffrkits/GTM/GTMkit.html

    The kit calls for a 97-04 C5 donor car, or you can piece the missing components together. I opted to do it piece by piece and purchased an 2002 LS1 from a junked Camaro complete with wiring harness and computer and all accessories for $3,000 with 38k mi. I want to build up this motor before dropping it into the car. Can any of you guru's please enlighten me.

    What is the HP/Torque of this motor? 345 or 385?
    What is the most obvious and first upgrades i should look into to get me into the 425 HP range reliably for closed track and auto x racing? Throttle Body and Cams?

    If it matters, this will be for a mid engine car and use a G50 trans.
    2250 lb car, low center of gravity.

    Thanks for all help regarding performance upgrades
    Last edited by GTM-Mulsanne; 08-18-2006 at 10:24 AM. Reason: Typo

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    Member wesTXwitesnake05's Avatar
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    Quote Originally Posted by GTM-Mulsanne View Post
    I am building a FFR GTM Kit car

    Website - factoryfive.com/table/ffrkits/GTM/GTMkit.html

    The kit calls for a 97-04 C5 donor car, or you can piece the missing components together. I opted to do it piece by piece and purchased an 2002 LS1 from a junked Camaro complete with wiring harness and computer and all accessories for $3,000 with 38k mi. I want to build up this motor before dropping it into the car. Can any of you guru's please enlighten me.

    What is the HP/Torque of this motor? 345 or 385?
    What is the most obvious and first upgrades i should look into to get me into the 425 HP range reliably for closed track and auto x racing? Throttle Body and Cams?

    If it matters, this will be for a mid engine car and use a G50 trans.
    2250 lb car, low center of gravity.

    Thanks for all help regarding performance upgrades


    probably porting the heads, a good sized cam, ls6 intake, and a good tune would get you pretty close. if youve got some money to spend look into a forged shortblock from texas speed or thunderracing for example. you'd have a brand new block with forged internals and you could use your junkyard motor's block and crank as a core exchange to save some money. just keep all the covers and all that and have the heads ported. if you did taht i bet you clould hit 425rwhp easy and have a reliable motor... good luck

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    Member Lawnman's Avatar
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    lookin for a ws6

    ?

    Have you started your build yet? Do you already have the GTM?

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    I'm schedule to receive the GTM towards the end of September. Factory Five posted an itemized spreadsheet defining additional parts required to complete the car and getting through that has kept my busy. So I suppose yes I started my build but no I do not have the GTM...?

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    Junior Member Duke of Cruel's Avatar
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    Quote Originally Posted by GTM-Mulsanne View Post
    I am building a FFR GTM Kit car

    Website - factoryfive.com/table/ffrkits/GTM/GTMkit.html

    The kit calls for a 97-04 C5 donor car, or you can piece the missing components together. I opted to do it piece by piece and purchased an 2002 LS1 from a junked Camaro complete with wiring harness and computer and all accessories for $3,000 with 38k mi. I want to build up this motor before dropping it into the car. Can any of you guru's please enlighten me.

    What is the HP/Torque of this motor? 345 or 385?
    What is the most obvious and first upgrades i should look into to get me into the 425 HP range reliably for closed track and auto x racing? Throttle Body and Cams?

    If it matters, this will be for a mid engine car and use a G50 trans.
    2250 lb car, low center of gravity.

    Thanks for all help regarding performance upgrades


    Hi,
    Nice kit,
    first you need a new set of heads, go patriot or similar, with 300+ flowing heads, and good rod bolts, intake from an ls2 with the 90 mm tb and extended wiring harness for the manfold pressure sensor(the cable is about 1 fot), a better oilpump and cam chain. I will also recomend that you balance the crank and put in new floating pistons and bush the rods, for reliably rev in to 7000 rpm or more. The lifters and push rods need to be changed to, they ar not up to any improvement in spring pressure or lift or rpm. A good cam is needed and there i would use the lunati 300/300 112 lsa and 0,595 lift,
    i am using a 114 lsa of that cam and it rews to 7500 rpm.
    And ofcourse uoy need to have it all tuned nicely by someone good, that is the most important thing. That will give you 475+ hp @ wheels with the g50, a lot more on most dyno´s. best of luck, and keep us updated with your project.
    DoC

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    Quote Originally Posted by Duke of Cruel View Post
    I will also recommend that you balance the crank and put in new floating pistons and bush the rods,
    DoC
    Balancing starts to be costly. If i was to take that route wouldn't purchasing a balanced crate motor with pistons, rods, balanced crank ect. be most cost effective?
    Since I’m trying to keep "Phase 1" cost effect and save the real coin for an LS7 crate motor I was hoping to keep the engine upgrades under $2k. I know that not much of a budget, but it seems adequate for headers, cams, springs, rods and lifters with a tune. Am I mistaken?

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    Junior Member Duke of Cruel's Avatar
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    Quote Originally Posted by GTM-Mulsanne View Post
    Balancing starts to be costly. If i was to take that route wouldn't purchasing a balanced crate motor with pistons, rods, balanced crank ect. be most cost effective?
    Since I’m trying to keep "Phase 1" cost effect and save the real coin for an LS7 crate motor I was hoping to keep the engine upgrades under $2k. I know that not much of a budget, but it seems adequate for headers, cams, springs, rods and lifters with a tune. Am I mistaken?
    You def could get it up from 325 hp to like 425+ hp on that budget, but dont turn it past 6800 with rodbolts, always get good rodbolts, that would be the end of it.
    Kit cars usually needs a specil kind of headers that you buy from the kit maker, og make them your self. Go in the used parts section and see what is for sale. There is also www.ls1tech.com and the www.corvetteforum.com they are also great lsx forums. And for 2k used you are past 500, and probably have a tuned ecu with it. http://forums.corvetteforum.com/show....php?t=1475196
    DoC

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    That is quite the car! I could get into working for a company like that. I did prototype component work for GM up till 4rys ago and I thought that was cool but this goes to a whole new level. Good luck with your project.

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    I wish you luck. My buddy got one of the first kits and he is having all kinds of issues....still not finished....and he's built other kit cars.

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    Quote Originally Posted by Whocares View Post
    I wish you luck. My buddy got one of the first kits and he is having all kinds of issues....still not finished....and he's built other kit cars.
    That's typical of a new kit. They are one year down and approaching 100 kits shortly. From what i understand most the bugs are being worked about and by 07 this should be greased

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    Your probably looking at a tad under 300 RWHP stock.
    I'd focus on getting her to breathe right....Heads/Cam/Intake/TB/Headers/Exhaust...this will give you around 420 RWTQ ...that is what you are after....Underdrive pulley will allow you to rev much quicker...getting you back into the power band....Mebbe $5K or $6K tops for all the above....I'm a big proponent of SD tunes...screw the MAF....I've had my LS1 over 600RWHP.....but now am convinced 400-450 RWHP is where one needs to be.

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    Junior Member Duke of Cruel's Avatar
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    Quote Originally Posted by GTM-Mulsanne View Post
    I am building a FFR GTM Kit car

    Website - factoryfive.com/table/ffrkits/GTM/GTMkit.html

    The kit calls for a 97-04 C5 donor car, or you can piece the missing components together. I opted to do it piece by piece and purchased an 2002 LS1 from a junked Camaro complete with wiring harness and computer and all accessories for $3,000 with 38k mi. I want to build up this motor before dropping it into the car. Can any of you guru's please enlighten me.

    What is the HP/Torque of this motor? 345 or 385?
    What is the most obvious and first upgrades i should look into to get me into the 425 HP range reliably for closed track and auto x racing? Throttle Body and Cams?

    If it matters, this will be for a mid engine car and use a G50 trans.
    2250 lb car, low center of gravity.

    Thanks for all help regarding performance upgrades

    the warhawks is coming out in september, and that is the way to go in ls7 engines, i just thought you should know.
    DoC

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    cool car--get pics of it arriving and post any and all....
    99 WS6 M6 NBM !Cags,!Cats,Vinci/Crane,Hurst,Detroit TruTrac,3:73,31 Splne,Edel.Race LT's,ORY,QTEC,Flow,ARP,Percy,MSD,SLP,AC/DELCO,Bosch,GMPP,Cntrfrce DF,Htchkiss,Susp.Tech,Lakewood,285's,Bilstein,Pro-kit,SLP,RK Sprt,A/Meter,Red Optima,Magnaflow S/S Tips,Hd Pins,Tint,Fire.Ex,[*4 Hot Rod Power Tours*]

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    Quote Originally Posted by GTM-Mulsanne View Post
    That's typical of a new kit. They are one year down and approaching 100 kits shortly. From what i understand most the bugs are being worked about and by 07 this should be greased
    Usually that is the case...but I think they are still waiting for parts and the customer service has been shitty. By 07 you are still only talking a couple dozen cars...

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    shit man with cam and bolt ons youd have like 430 rwhp the right head cam setup could net almost 500rwhp.....and the 2002 ls1 already has performance rod bolts and ls6 intake

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