Thread: 3.8 series III mods! HV3 and cold ar intake advice?

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  1. #1 3.8 series III mods! HV3 and cold ar intake advice? 
    SE Level Member tomasz26's Avatar
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    I have a 2004 Grand Prix GT (naturally aspirated) w/ a tuned PCM. I was looking into installing an HV3 but I heard there are low end losses and high end gains in power, is this true? Would you recommend this upgrade or no? I'm looking for faster acceleration NOT top speed (It's more fun to toss your head back on the entrance ramp then to get a ticket for doing double the speed limit).

    Also I was looking into installing a cold air intake. What brand would you recommend? It seems like the Spectre is a good bang for its buck. But I would like to know more before going any further.

    Please let me know what you think and if there are any other mods that would give my whip a little more kick.

    Appreciate it!
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  2. #2 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    GrandPrix Junkie NegativeOne13's Avatar
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    HV3 you don't necessarily lose bottom end. It changes the powerband to higher RPMS. Not really noticeable to be honest. As for accel, NA already have decent accel. Top end is what kills em though. CAI, make your own. Buy a $20 spectre cone, do some plumbing and done.

    And smile it's Blacktooth Grin!
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  3. #3 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    GTP Level Member FriboRage's Avatar
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    Search. Button.

    Cone. On. TB.

    Look on ebay, you can get a 60 dollar dryflow AEM filter for 20 bucks shipped, cant beat it. You can get a rubber coupler or 2 at Lowes or Home Depot, whole thing might be 40 bucks tops and will be easier, and work as well if not better as a 200 dollar vendor abomination.

    /thread

    hv3 is awesome... no loss in low end, I had a noticable gain above 4k rpm, car used to fall off and not make anymore power after that point, now I pull hard all the way to 6k
    but when you do it, make sure you double and triple check the plenum bolts.. in fact use thread locker.

    Mine came loose on the tb side where coolant flows, I had a huge leak and didnt know it until I revved my engine and heard bubbles in the dash.

    Those ones I got to stay tight but it seems like 2 of them in the middle of the plenum keep coming loose, cant get em to stay tight, I think it's making vac leaks... gunna do threadlocker on them this week.
    Last edited by FriboRage; 04-30-2012 at 10:36 AM.
    --------------------------------------------------------------------------------
    2004 Grand Prix GTP Comp G: Intake, F+R plogs + downpipe, 1.7 YT Rollers, Overkill, F-body front brakes, drilled/slotted r1 concept rotors.
    Sport Edition Kv5 18x8
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  4. #4 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    GrandPrix Junkie NegativeOne13's Avatar
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    Can't do cone on tb on 04+ homeslice.

    /thread not closed.

    And smile it's Blacktooth Grin!
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  5. #5 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    The Mod Monkey Mad Monkey's Avatar
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    i just made a sweet intake with a few plumbing parts, and a 4x9 ebay filter.. works like a champ
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  6. #6 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
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    Just buy a Z3 kit and leave it at 5-6 PSI.

    Much better gains.

    Long story short: Without boost, you won't gain much power.

    HV3 is only worth it if you've got some sort of valvetrain mod installed as well.

    Like ER rockers or a cam.

    Even with all of the bolt ons and a cam, 240 CHP is about all you'll see.
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  7. #7 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    GTP Level Member FriboRage's Avatar
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    Quote Originally Posted by NegativeOne13 View Post
    Can't do cone on tb on 04+ homeslice.

    /thread not closed.
    Ok well



    Cone on MAF on tb, dawg.
    --------------------------------------------------------------------------------
    2004 Grand Prix GTP Comp G: Intake, F+R plogs + downpipe, 1.7 YT Rollers, Overkill, F-body front brakes, drilled/slotted r1 concept rotors.
    Sport Edition Kv5 18x8
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  8. #8 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    The Mod Monkey Mad Monkey's Avatar
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    yeah, not Cone on TB.. Cone on MAF on TB
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  9. #9 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    GTX Level Member tod1d's Avatar
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    if its low end power you want then get a L32 motor or top swap your current one

    I wanted more top end power so stayed n/a and did the basic upgrades. If I can find a PLOG cheap enough I will do that one too.

    2007 Pontiac Grand Prix
    http://www.cardomain.com/ride/2990036
    L26, CAI, HV3, ER Rockers, PLOG, Overkill Tune, flipped dog bones
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  10. #10 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
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    Quote Originally Posted by tod1d View Post
    if its low end power you want then get a L32 motor or top swap your current one

    I wanted more top end power so stayed n/a and did the basic upgrades. If I can find a PLOG cheap enough I will do that one too.
    did you notice a big gain in your mods from stock?.....also for the pricw of a plog and dp u better off getting ssac headers for cheaper...which would make both front and rear banks safer
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  11. #11 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    GTX Level Member tod1d's Avatar
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    No big gains from my upgrades from what I can tell so why go overboard with headers. From what I understand the front manifold is the biggest restriction on my car and I don't have a u-bend in my downpipe.

    2007 Pontiac Grand Prix
    http://www.cardomain.com/ride/2990036
    L26, CAI, HV3, ER Rockers, PLOG, Overkill Tune, flipped dog bones
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  12. #12 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by tod1d View Post
    if its low end power you want then get a L32 motor or top swap your current one
    This wouldn't be a "cheap" bolt on part...nor quick...that's time consuming and would require at the MINIMUM a grand the way L32 pricing is going for a full setup. You could top swap for half the price...but then a custom tune would be needed, along with supporting mods...so it would close in on a grand as well.

    Quote Originally Posted by tod1d View Post
    I wanted more top end power so stayed n/a and did the basic upgrades. If I can find a PLOG cheap enough I will do that one too.
    I want to know what top end you're talking about? My N/A car was modded, and top end didn't exist...hell, even I didn't have much "top end" on my XP'd/3.25"/Headers blower car. 3800 =/= top end unless you go the snail route.

    Quote Originally Posted by 06PONTGP View Post
    did you notice a big gain in your mods from stock?.....also for the pricw of a plog and dp u better off getting ssac headers for cheaper...which would make both front and rear banks safer
    Not really anything you have to worry about "banks" wise without boost...you could knock the pee out of an N/A motor on crappy gas and a clogged cat and it probably wouldn't chip or pop a piston like a boosted car would.

    If I had an N/A car, like I said...I'd do it this way...

    Intake of whatever kind, doesn't matter...probably whatever is the cheapest they all do the same thing...
    L26 UIM + HV3
    Catless Headers/Stock Catback + Whatever mufflers/tips you want...they don't matter...just make noise...no gains.
    ER Higher Ratio Rockers or GT2 Cam with L76 or Crow 105 Springs
    Ported Lower Intake
    Ported/Polished Heads

    Then, enjoy beating stock or small bolt on GTP's...because that's about all it'll net you until you boost it. Expect in the range of 210-230 FWHP.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  13. #13 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    GTX Level Member tod1d's Avatar
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    My car feels faster now when going WOT then it did before. I have no way of proving that though.

    2007 Pontiac Grand Prix
    http://www.cardomain.com/ride/2990036
    L26, CAI, HV3, ER Rockers, PLOG, Overkill Tune, flipped dog bones
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  14. #14 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    SE Level Member tomasz26's Avatar
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    Quote Originally Posted by bluegtp91 View Post

    If I had an N/A car, like I said...I'd do it this way...

    Intake of whatever kind, doesn't matter...probably whatever is the cheapest they all do the same thing...
    L26 UIM + HV3
    Catless Headers/Stock Catback + Whatever mufflers/tips you want...they don't matter...just make noise...no gains.
    ER Higher Ratio Rockers or GT2 Cam with L76 or Crow 105 Springs
    Ported Lower Intake
    Ported/Polished Heads

    Then, enjoy beating stock or small bolt on GTP's...because that's about all it'll net you until you boost it. Expect in the range of 210-230 FWHP.

    Would these set of mods be very cheap either though? I looked into doing a top swap but the L26 is a little trickier than the L32 and quite expensive. Then not to mention the problems I could run into top swapping a motor that isn't commonly supercharged. And I would never drop a L32 in it. Might as well save your money sell the GP with the L26 and buy a GXP.

    Also, my 04 GP is at 100k miles and as much as I want to do modifications to increase my performance, I don't want to lessen the life of the car because it is a daily driver.

    To be honest I am a broke college kid that just likes to work on my car when ever I can. It definitely is not a cheap hobby so that's why I am looking for modifications that are on the low end of the spectrum when it comes to price and stuff that I could do my self with the help of some mechanic buddies if necessary. I think it's all fun and interesting but unfortunately I am not in a position to really go all out. If I was I would be telling you guys my quarter mile time after installing a twin turbo and if the car broke it's ok because I have a truck and trailer to pull it home and play with it some more .
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  15. #15 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by tomasz26 View Post
    Would these set of mods be very cheap either though? I looked into doing a top swap but the L26 is a little trickier than the L32 and quite expensive. Then not to mention the problems I could run into top swapping a motor that isn't commonly supercharged. And I would never drop a L32 in it. Might as well save your money sell the GP with the L26 and buy a GXP.
    Wait...

    Yes, just as expensive...but you don't get the headaches of top swapping. How is an L26 "trickier" than an L32? They are essentially the same exact engine minus rod strength and compression ratio...and an L26 isn't commonly top swapped? FTLULZ...plenty of '04+ cars and L26's are top swapped; research guy...research. Why wouldn't you just drop an L32 in? And even more LOL's at the GXP...you want to talk about expensive aftermarket with minimal gains and a dumb setup...then sure...go buy one.

    Quote Originally Posted by tomasz26 View Post
    Also, my 04 GP is at 100k miles and as much as I want to do modifications to increase my performance, I don't want to lessen the life of the car because it is a daily driver
    100k miles is nothing. The longevity of these motors is simple maintence, don't drive like I do all the time...and break everything...bolt-ons, a cam/heads setup all motor...or a bolt-ons top swap isn't going to "lessen" the life of anything 3800 wise.

    Quote Originally Posted by tomasz26 View Post
    To be honest I am a broke college kid that just likes to work on my car when ever I can. It definitely is not a cheap hobby so that's why I am looking for modifications that are on the low end of the spectrum when it comes to price and stuff that I could do my self with the help of some mechanic buddies if necessary. I think it's all fun and interesting but unfortunately I am not in a position to really go all out. If I was I would be telling you guys my quarter mile time after installing a twin turbo and if the car broke it's ok because I have a truck and trailer to pull it home and play with it some more .
    One single turbo > Twins anyways.

    To add...you give me a budget...I'll tell you the best bang for your buck mods...PM me if you want. Or discuss it here...don't care, I'll help.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  16. #16 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
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    I was wondering if anyone was going to respond.
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  17. #17 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    GXP Level Member Grimsin's Avatar
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    My car is deff faster then it was, but how much? dont know lols.

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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  18. #18 Re: 3.8 series III mods! HV3 and cold ar intake advice? 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by matt5112 View Post
    I was wondering if anyone was going to respond.
    Shouldn't doubt me like your love for coolant.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
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