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tune or no tune?

This is a discussion on tune or no tune? within the Computer & Tuning forums, part of the LSx Technical Help Section category; ok so i keep throwing a p0420 so my cats are going bad and i now have 373 gears and ...

  1. #1
    🤔 11s. blackbirdbrain89's Avatar
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    black trans am
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    tune or no tune?

    ok so i keep throwing a p0420 so my cats are going bad and i now have 373 gears and would like to have the speedo closer to true. but i plan plan on going with a ls6 intake and some long tubs along with a hot cam.... shuld i hold off or get it done and tell them to tune it a lil bit rich? i also would like to take the top speed limmiter off ; egr; smog. i dynoed 341 whp and 352 wft lbs. i want to see 370 ish would a tune be worth it? btw the car has
    maganflow cat back
    slp lid
    slp bellow
    free ram air
    port and polish throtle body
    p&p maf
    k&n filter
    160 stat
    centerforce dfx 6 puck street /strip clutch
    12.5 flywheel
    stock tune made 341hp and 342 ft lbs of tq
    moser axles 1541h with arp wheel studs
    movite 373 gears
    mac rear end cover
    new eaton lsd/posi
    spon LCA's and Relocation Brackets
    power slot rotors and hawk pads
    slp tcs elim
    skip shif elim

  2. #2
    TunedbyFrost.com Tuner Frost's Avatar
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    that's bunch of HP to not have headers.... I don't think I have ever seen a car with no headers and stock internals dyno that high. The only real mod that does much of anything for you is the lid and catback (as far as dyno numbers). You are lucky that raped MAF isn't killing you.

    You could always get a mail order tune to cover the items that you want/need now. If you end up getting a mail order tune from me, and later come down to get tuned on the dyno, I take $100 of the $125 you paid for mail order tuning off of the full tuning bill.

  3. #3
    🤔 11s. blackbirdbrain89's Avatar
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    black trans am
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    well theres a guy i know with a 02 camaro with a f1 procharger with 1100 hp i that tunes lsx cars around my way so thats probly who im haveing do it. im also 90% sure that my cars a freek i know for fact that its the stock intake manafold. i havent had the valve covers off yet so there might be diffrent rockers or some thing but i dont think so... put it this way with out the 373s and the port and polished TB i ran a 12.9 on street tires 255 50 16s. and i over reved 2nd lil bit the car is geting ready to hit 70 and has never seen doino oils its all syn at 12k the last owner broke the right axle and at 23k he broke the lsd.... when i got it i put the lid and took it to the track and broke the left axle and trans.. and then i broke the lsd not to long after

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