Thread: tune vs no tune. safe?

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  1. #1 tune vs no tune. safe? 
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    Hi im trying to prove a friend wrong im saying that its not safe to run a 3.4 mps on a stock tune with proper mods. 98' gtp open cone intake, 104's, ported front manifold, 3" dp, 180* tstat. still need a tune right?
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  2. #2 Re: tune vs no tune. safe? 
    Turbo is the way to go. REDCRAPGP's Avatar
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    He can run that without a tune. I would be more concerned with if he is knocking or not. Hope he has something to scan with.

    Edit: most mods you can run on a stock tune but of course you benefit more with a tune.
    Squirrels are my engine. I need a Ford Regal
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  3. #3 Re: tune vs no tune. safe? 
    The Blue One blueguy's Avatar
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    Yeah.

    KR is the important thing.

    Who cares if it's a stock tune or not.

    I'd be willing to bet it isn't knock free with those mods though.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  4. #4 Re: tune vs no tune. safe? 
    DUI BABY Bio248's Avatar
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    the stock tune is pretty resilient. i bet that car is running fairly well with what its got.
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  5. #5 Re: tune vs no tune. safe? 
    Moderator dsmuts's Avatar
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    Stock tune will be fine I ran one in my 98 for a good while
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
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  6. #6 Re: tune vs no tune. safe? 
    GXP Level Member GTPpower's Avatar
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    The only reason I tell people to get a tune before dropping pulleys is because the stock tunes are programed to cut injectors in certain situations. That can hurt a stock motor, but it is more dangerous once a smaller pulley is used.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  7. #7 Re: tune vs no tune. safe? 
    Moderator dsmuts's Avatar
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    When does it cut injectors? I'm just wondering because I'm running stock tune on my comp g until I get bigger injectors and it seems to get lean every now and again for no reason.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  8. #8 Re: tune vs no tune. safe? 
    The Boss Iceman6669's Avatar
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    I ran ok for a week on a stock tune after dropping pullies
    97 GTP Sold-prolly rusted away by now
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  9. #9 Re: tune vs no tune. safe? 
    Moderator DanPrixGTP's Avatar
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    My car would probably run better on a stock tune.

    '97 GTP - Stage 2 Heads, 90# Springs, 1.9 Harland Sharp Rockers, Gen V, 3.0, Intake, N* TB, LQ4, FSIC, 10.5mm Wires, Poly Mounts, SLP Headers, Borla Exaust, Built Trans - SOLD*

    '08 G8 GT - 6.7L 408CI Stroker, 239/254 Cam, Fast Intake, 102mm TB, CAI, Full Exhaust.





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  10. #10 Re: tune vs no tune. safe? 
    GXP Level Member JoRoW99's Avatar
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    Depends what you mean by safe. If your friend thinks adding more hot air with the same timing and fueling and not looking at KR is safe, then yea its safe.
    '01 GT - Top swapped. ported SC/Heads/TB, SD headers, open cone, HPTuners, 3.4 MPS, 60#'s, E85.______________________SMGPFC #99_______________________
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  11. #11 Re: tune vs no tune. safe? 
    GT Level Member Kilroy's Avatar
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    Regarding the stock tune vs aftermarket tune, why can't we just disconnect the battery for a long enough time, and then let the computer relearn everything? Should it then be able to learn the proper fuel ratios, etc? I understand the aftermarket tune can turn on fans at a lower temp, get rid of rev limiter and speed limiter, but in general, isn't this what computers in vehicles are designed to do?

    P.S. I am obviously no mechanic, so please explain without calling me a moron.
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  12. #12 Re: tune vs no tune. safe? 
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    Quote Originally Posted by Kilroy View Post
    Regarding the stock tune vs aftermarket tune, why can't we just disconnect the battery for a long enough time, and then let the computer relearn everything? Should it then be able to learn the proper fuel ratios, etc? I understand the aftermarket tune can turn on fans at a lower temp, get rid of rev limiter and speed limiter, but in general, isn't this what computers in vehicles are designed to do?

    P.S. I am obviously no mechanic, so please explain without calling me a moron.
    Because your PCM doesn't learn much at all.

    Adjusts the fuel a bit here and there, and adjusts the transmission pressure. That's about it.

    More advanced PCMs will adjust everything from timing to fuel to boost to shift points and so on.
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  13. #13 Re: tune vs no tune. safe? 
    GT Level Member Kilroy's Avatar
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    So our PCMs are rather dumb then? Why can't we buy these "Bully Dog" devices that are supposed to be the cat's meow for diesel engines?? Why do our gas engines need a $1,000.00 piece of equipment, and THEN have to pay for everytime we want to tune the engine? Why don't we get something as simple as device that gives us a Stock setting, a power setting, and a milegae setting??? I realize on a diesel they just change the point the wastegate opens up to give more power, but still??
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  14. #14 Re: tune vs no tune. safe? 
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    Well actually....

    $300 buys you a DHP.

    Unlimited tunes for any 3800 powered car.

    $500 for HPT, $100 worth of credits for each car, then tune unlimited number of times with that interface. $500 HPT comes with $400 worth of credits.

    You can buy canned tunes. They're a couple hundred if you don't send back a PCM for the core charge. Probably not a good idea to send your factory one away in case you have issues.

    Handheld tuners like that are typically only worth owning if your vehicle has a turbo, or a very conservative factory tune. The reality of your car is, the factory tune is a great street tune in terms of fueling and timing and there is no boost control via PCM. That is simply pulley size.

    If you want to talk expensive, $500-800 for a tune for my Volvo granted you mail in your PCM so they can flash it. $800-1000 gets you a handheld that gives you two options, stock or the tune you paid for. Bought some new exhaust parts and what a stage 2 tune? Extra $100+ please. Have those exhaust parts when you're buying the kit and what that tune from the get go? Still have to pay that $100.

    Thinking about it, most non domestic cars cost that much for tunes.

    Even those handheld devices for other platforms aren't cheap at all. Especially considering they don't allow you to really do anything. They can't datalog your vehicle or edit any part of the PCM like HPT/DHP can.
    Last edited by matt5112; 07-08-2013 at 10:54 PM.
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  15. #15 Re: tune vs no tune. safe? 
    GT Level Member Kilroy's Avatar
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    Thanks a bunch for the info Matt. Learned alot. Is there any computer programs one can buy? I have a ggod OBDII - USB interface cable, that allows me to read dang near anything on my GP, is it possible to use this setup to change values as well?
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  16. #16 Re: tune vs no tune. safe? 
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    Unfortunately you're stuck using either DHP or HPT.

    You have to use both the software and interface.
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  17. #17 Re: tune vs no tune. safe? 
    GT Level Member Kilroy's Avatar
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    Quote Originally Posted by matt5112 View Post
    Unfortunately you're stuck using either DHP or HPT.

    You have to use both the software and interface.
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  18. #18 Re: tune vs no tune. safe? 
    GT Level Member Kilroy's Avatar
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    Is there anything to watch if buying a used DHP, or is that not a good idea?
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  19. #19 Re: tune vs no tune. safe? 
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    Not that I'm aware of, there might be differences in the interface firmware and so on which might limit which models you can tune.

    HPT isn't worth buying used unless there are two credits for every $100 over $100 the person is asking for it. Unless a bunch of year/model/engine families are unlocked.
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