Thread: Top Swap Info and Faqs, Also lots of 3800 Info

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  1. #381 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    I live here. 02NavyBlue's Avatar
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    Honest question. What's the pros and cons on topswap vs. complete L67 swap? I know the flex plates will have to be switched, maybe a few other things. I would rather find a used $400 L67 in the area than spend $1200 on a top swap.
    2006 Grand Prix GT S/C 109k - Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. Retros soon to come.
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  2. #382 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    GT Level Member andesmint's Avatar
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    Quote Originally Posted by 02NavyBlue View Post
    Honest question. What's the pros and cons on topswap vs. complete L67 swap? I know the flex plates will have to be switched, maybe a few other things. I would rather find a used $400 L67 in the area than spend $1200 on a top swap.
    Basically the only advantage of a topswap is it'll have 5% more power due to the N/A block having higher compression. This does however make a topswap more vulnerable to KR without the proper supporting mods.
    2000 GT Mods: HAI, 10.5mm wires, rebuilt 60k motor, ZZP stainless headers, magnaflow mufflers, fresh paint job,L-67 top swap, Ported SC...
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  3. #383 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    Florida Tuner Z34Phoenix's Avatar
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    Also in addition to the compression increase, most retain the better gearing from the NA trans.
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  4. #384 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    DUI BABY Bio248's Avatar
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    do a whole motor swap and do all the work to it outside of the car (do a cam, seriously).
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  5. #385 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    GT Level Member April Thompson's Avatar
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    Will higher octane help out with KR? Also... where would the MAP sensor be on an L32, since this thread seems to be supporting L67s more, and will the 2-bar MAP for an L32-to-L26 top swap need the different connector too? Or does ZZP offer a bootstrap adapter pigtail now? Sorry in advance for what seems like tired old questions (but like I said I didn't see any MAP Q's for 04+)!

    2004 Grand Prix GT2-clone A.K.A. the "Cybercar;" Galaxy Silver; 146K miles; RETROFITS: leather-wrapped steering wheel (w/audio controls) & shift knob; trip computer; map lights & dual lighted vanity visors; heated (?) leather seats w/ 10-way power driver's seat; ​HUD conversion
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  6. #386 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    LaBarge Supercharged sseilmnop's Avatar
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    I'll answer first question about octane! YES, higher octane gives lower KR. E85 is like 105 octane!
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  7. #387 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    SE Level Member Thethudelh's Avatar
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    I need to replace my motor in a 00 GTP.Dropped a rod and am wanting to use a 97-03 N/A block for this heart transplant. If I keep all things the same save for the block and internals, is there anything I would need to do for tuning due to the compression ratio difference? Also, I know this is off topic a bit but I want to install headers. Will I need to change the down pipe to get rid of the u bend? I know these are probably newbie questions but i am not a mechanic, i just love messing with my car lol. Thanks in advance.
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  8. #388 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    Florida Tuner Z34Phoenix's Avatar
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    yes there will be extra tuning needed. if you are currently running just the stock pulley and adding headers you will still need to add rockers or another flow mod to safely run with the added compression. tuning will be a must. just for comparison, i am running a ported tb and blower, ported heades with high flow valves, headers, and 2.5" highflow exhaust. I had to do a good amount of tuning to get it all dialed in and make it a solid daily driver.

    oh and the headers have their own downpipe. it will replace the secion that has the ubend
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  9. #389 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    GrandPrix Junkie Sandman's Avatar
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    At the very least you will need to run a larger pulley and plog/DP if you do nothing else, the tune is a must no matter what. I'm running L32 heads, plog/dp, rockers, a ported blower, with a stock pulley. I've got headers that I still need to throw on and a 3.6 pulley.
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    You said "I'm done with it"... car says "Oh, really? *trollface*"
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  10. #390 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
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    Ok I'm am gonna do a top swap for my base 3.8 2005 grand prix. Wat is the 1st thing that I should start with?. I reviewed ur list on what I need but still jus wanna clarify the steps cuz mine is a 2005 base
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  11. #391 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    GrandPrix Junkie
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    Quote Originally Posted by demigodz1984 View Post
    Ok I'm am gonna do a top swap for my base 3.8 2005 grand prix. Wat is the 1st thing that I should start with?. I reviewed ur list on what I need but still jus wanna clarify the steps cuz mine is a 2005 base
    It's the same stuff.
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  12. #392 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
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    Ok thanks man
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  13. #393 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    GrandPrix Junkie SgtMarshal's Avatar
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    heads ported by chris hinson, aka orangeL67,
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  14. #394 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
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    Ok so now that I think bout it I got 165000 miles on my L26 NA engine I should jus put a whole new engine in right?. I should jus rebuild a L32 it would be a wiser move u think
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  15. #395 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
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    Cuz I'm gonna go and start grabbing parts
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  16. #396 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    GTP Level Member 99GT2dr's Avatar
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    165k is nothing, don't try to rebuild, it wonk work out unless you drop a lot of cash at a machine shop. Seriously, 165k miles is not a lot for these engines.
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  17. #397 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
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    Thanks good to kno wasn't sure how they fit with mileage
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  18. #398 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
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    Still tho if I'm gonna do this car over I want the engine bay looking clean and badass
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  19. #399 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
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    Jus need a good understanding on the swap for the engine I got cuz I see alot of swaps but not the one I got so I'm kinda lost still reading alot tho
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  20. #400 Re: Top Swap Info and Faqs, Also lots of 3800 Info 
    Donating Users bandook's Avatar
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    Quote Originally Posted by demigodz1984 View Post
    Jus need a good understanding on the swap for the engine I got cuz I see alot of swaps but not the one I got so I'm kinda lost still reading alot tho
    Get the top swap parts off an L32. Only difference I know of is you have a drive by wire TB, as does the L32. Everything else in the swap will be the same.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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