Thread: changing tune for an N/A intake and throttle body

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  1. #1 changing tune for an N/A intake and throttle body 
    GrandPrix Junkie SgtMarshal's Avatar
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    I have a 2001 GTP. I installed an xp cam with 130 lb springs with a full size intercooler and a northstar tb with LQ4 maf. I decided to switch to a turbo, so im taking the intercooler off and swapping to an N/A L36 intake manifold with an L36 tb and maf. I also have 42 lb injectors. I'm changing the intake because the supercharger lim has been ported too much to seal to the supercharger and I'm switching to a turbo anyway, so I would like to be able to keep driving the car until the turbo goes on.

    Can I just reset the tune to an N/A tune with a different IFR for the 42's?

    Would I be able to get more timing advance than the normal N/A tune?

    What would be a better way to do it?
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  2. #2 Re: changing tune for an N/A intake and throttle body 
    GTP Level Member 04lss's Avatar
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    If you're running an l67 lower end the NA tune is going to be geared for higher compression than you have.
    2017 GTI 6mt 320whp 400wtq , 2012 Volvo S60 T6 300hp of Swedish safety, (Sold) 2019 Ford Mustang GT. 460 screaming eagles. 2004 Buick Regal GS "Gramps" Intercooled, corn fed, ported g3 m90, 1.9 rockers, 80# injectors.
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  3. #3 Re: changing tune for an N/A intake and throttle body 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Just make the injector tables right and load the a stock maf table, tune the car from there.

    SMGPFC Member #1
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  4. #4 Re: changing tune for an N/A intake and throttle body 
    Turbo is the way to go. BillBoost37's Avatar
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    I'll add in that you are going to need to plug a set of injector holes.
    L67 are in the heads
    L36 are in the LIM
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  5. #5 Re: changing tune for an N/A intake and throttle body 
    GrandPrix Junkie SgtMarshal's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    I'll add in that you are going to need to plug a set of injector holes.
    L67 are in the heads
    L36 are in the LIM
    I'm either going to tap in some threads or use freeze plugs
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  6. #6 Re: changing tune for an N/A intake and throttle body 
    Turbo is the way to go. BillBoost37's Avatar
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    I'd want something more secure than a freeze plug when you are talking about crazy turbo builds that may get upwards of 15psi
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  7. #7 Re: changing tune for an N/A intake and throttle body 
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    Quote Originally Posted by BillBoost37 View Post
    I'd want something more secure than a freeze plug when you are talking about crazy turbo builds that may get upwards of 15psi
    that's a good point, I hadn't considered it would be a factor. I'll just tap some threads and install some plugs then.
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  8. #8 Re: changing tune for an N/A intake and throttle body 
    Turbo is the way to go. BillBoost37's Avatar
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    Or.. get six nozzles for NOS and install them in those holes.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  9. #9 Re: changing tune for an N/A intake and throttle body 
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    those nozzles are expensive, I think I would have to get a reducer from 3/8's to 1/8. I haven't tapped the holes yet so im not entirely sure what size tap I will use, but I think its about a 3/8's inch.

    any idea how much timing advance I will be able to run with an N/A upper intake and an L67 bottom with an XP cam?
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  10. #10 Re: changing tune for an N/A intake and throttle body 
    GrandPrix Junkie CrazyGuy03's Avatar
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    Without boost, just reference a n/a timing table. And add from
    there
    with boost, probably less then what you had with the supercharger.
    2003 Buick Regal GSX lots of mods - click here to see latest build - http://www.grandprixforums.net/threa...ld-for-the-gsx

    *For Reference - Does not have a Zack Howard Cam - It's an Intense Stage 3 - Thank You*
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  11. #11 Re: changing tune for an N/A intake and throttle body 
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    Quote Originally Posted by SgtMarshal View Post
    those nozzles are expensive, I think I would have to get a reducer from 3/8's to 1/8. I haven't tapped the holes yet so im not entirely sure what size tap I will use, but I think its about a 3/8's inch.

    any idea how much timing advance I will be able to run with an N/A upper intake and an L67 bottom with an XP cam?
    3/8" NPT is a little large the hole is just over 1/2" for the tap, 1/4" NPT would be a better choice and 3/8-1/4 NPT reducer bushings are easy to find even at Home Depot.

    Jeff
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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  12. #12 Re: changing tune for an N/A intake and throttle body 
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    Quote Originally Posted by J57ltr View Post
    3/8" NPT is a little large the hole is just over 1/2" for the tap, 1/4" NPT would be a better choice and 3/8-1/4 NPT reducer bushings are easy to find even at Home Depot.

    Jeff
    that would explain why I smoothed down the bottom 3 threads of the tap. I found someone that might be able to tig weld the manifold, which will be a lot easier than tapping and threading. If the welding part doesn't work out, I have a friend that has more tools than I, that will help tap the holes and plug them.
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  13. #13 Re: changing tune for an N/A intake and throttle body 
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    Tapping and plugging is the way to go it's easy. Trying to weld an aluminum intake of unknown metallurgy is asking for it to crack, even if you preheat it and properly cool it. Trust me on tapping I just had to change a 1/4 NPT to 3/8" NPT and it took me all of 5 minutes.

    where the cable comes out in the picture, we only had 3/8" cord grips so that's where it was drilled and retapped.



    Jeff
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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  14. #14 Re: changing tune for an N/A intake and throttle body 
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    what size drill did you use to bore the hole out for the 3/8" npt tap?
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  15. #15 Re: changing tune for an N/A intake and throttle body 
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    Well, I think I used a 27 or 29/64", but it's really not that important. You want to look at where you want the bushing to set. Then use a drill smaller than that diameter. Since its tapered you can have it go in and stop within a few threads, or go all the way to the base. But if you go with the minimum size you have to ream a lot more metal out. I don't keep track I just grab a drill bit that's just larger than the tip, at the first few real threads on the tap.

    The chart calls for a 37/64" (.578", or little bigger than 5/8") for 3/8" pipe and for 1/4" 7/16".

    Jeff
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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