Thread: How to Mod a LIM

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  1. #1 How to Mod a LIM 
    Turbo is the way to go. BillBoost37's Avatar
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    Modifying an LIM can be done for a few different reasons. Better air flow, better coolant flow, keep an L36 from hyrolocking etc etc.

    Cleaning the LIM:
    I have found that working on anything car related is easier when clean. Take a moment and clean the parts. Typically I'll use Simple Green or Purple Power to degrease an item. However when it's available a pressure washer makes quick work of cleaning and gives you a bath at the same time. After drilling/tapping and grinding on your manifold, you should rinse it with water and air dry. This will keep anything out of the rest of your motor and cooling system. It is assumed your manifold is off for all the below items.

    Coolant passage blocking:
    There is a small loop in the coolant system that brings coolant up out of the LIM into the UIM or SC and into the throttle body. This loop is considered by most to be pretty worthless. It may have a purpose in below freezing temps where a throttle body might ice up. In all the research I've done, it's only been found to potentially be a problem at the north and south poles. The heat reduction to a TB by doing this is minimal, if even measureable. This is commonly done for Gen V swaps to stop the flow before hitting the throttle body adapter. Also in NA cars to keep coolant out of the plastic manifold that can rupture and fill the cylinders with coolant.

    Here is an L67 LIM. See the two recessed holes. Those are the ports we are speaking about. On NA manifolds and many L32 manifolds those are not recessed.


    You drill with the proper drill, then tap with 1/4" NPT tap.



    Using a little pipe sealant you insert the headless 1/4" NPT pipe plug. Tap it slowly and keep trying the plug. Being NPT, the threads are tapered, you don't want to tap too far and have a loose plug.



    Increasing Coolant Flow:
    Now if you have done the above and blocked the TB coolant ports, your coolant flow is reduced slightly. In our 3800 motors, it is known that cylinders 3 and 4 (both middle cylinders) run hotter than the other four because they are in the middle of the heat sandwich. I like to increase the flow from the rear head to the front head (thermostat area) by opening up the area behind the endcap on the LIM. This cap is under the throttle body. Have a dealer only rear intake coolant cover gasket (24505049) on hand and remove the two 8mm bolts holding the cap to the manifold.


    I find that hogging it out a bit to look like this helps keep heat from building in the rear head.
    Before:

    After:


    Post SC air temp sensor:
    If you have an interest in an air temp sensor, the best sensor appears to be an early 90's 350 TBI air temp LIM sensor. Looks like this


    They appear to be 3/8" NPT and the best placement appears to be in the end of the LIM near the #1 runner.


    Porting the runners:
    This should only be done if head porting work has been done. Otherwise if you gasket match the LIM runner and not the head, the air hits the edge of the head and that causes a disruption to the air flow.
    I use an old gasket and bolt it to the LIM, then using a carbide bit, open the port to the gasket size, and smooth the rest of the runner from there. Sorry, no pics.

    Opening up the inlet:
    If you are going from a Gen 3 to a Gen V or intercooling, you will want to open up the LIM's air inlet. This is really dependent on the size/shape of what you are adding.

    Easy
    Last edited by BillBoost37; 04-08-2013 at 12:24 PM.
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  2. #2 Re: How to mod an LIM 
    Donating Users foursixer's Avatar
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    what would we do without you! im proud to be the recipient of such and LIM.
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  3. #3 Re: How to mod an LIM 
    Turbo is the way to go. BillBoost37's Avatar
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    Quote Originally Posted by foursixer View Post
    what would we do without you! im proud to be the recipient of such and LIM.
    You guys would probably have a lot less headaches.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  4. #4 Re: How to mod an LIM 
    Mullet Member Wotgtp's Avatar
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    GJBB
    - Ed - 2000 Grand Poverty Daytona edition. Rough idle. Funny whistle. Steering issues at WOT. 3.8 SC pulley.
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  5. #5 Re: How to Mod a LIM 
    The Blue One blueguy's Avatar
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    Bill...I started on a L36 LIM...wanna finish it?
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  6. #6 Re: How to Mod a LIM 
    GTP Level Member lambokit's Avatar
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    Sweet. Thanks for the info!
    Lambokit to be built!!!!!
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  7. #7 Re: How to Mod a LIM 
    Turbo is the way to go. BillBoost37's Avatar
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    GJBB? I'm lost there junior.. type that crap out please.
    Nick.. sure, pay shipping both ways and send $50 for the time.

    Enjoy
    I drink..so consider that when reading my posts.

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  8. #8 Re: How to Mod a LIM 
    I say it with pictures Abrasive's Avatar
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    Very nice Bill. I've seen a lot of guys fill the holes with Quicksteel. I've also seen a bunch later that the Quicksteel had popped up out of the holes and allowed coolant to leak into the gasket. Never been a fan of the Quicksteel method, so this certainly looks like a better way to do it.

    Nice write up.

    Master Certified Auto Glass Technician - 23+ yrs in the biz.
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  9. #9 Re: How to Mod a LIM 
    Turbo is the way to go. BillBoost37's Avatar
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    Yeah, I've done the dime mod as well and do like it. One popped once, of course the customer had filed that one. This method is much more reliable, which is why I was willing to document it.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  10. #10 Re: How to Mod a LIM 
    Donating Users jrocthakidd's Avatar
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    damn looks sweet! how much would u charge me to do this for me? if u would
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  11. #11 Re: How to Mod a LIM 
    Turbo is the way to go. BillBoost37's Avatar
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    Depends on what you want/need. Pm on the way.
    I drink..so consider that when reading my posts.

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  12. #12 Re: How to Mod a LIM 
    GT Level Member GOINDEF's Avatar
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    now how do i go about doing that to an l26 LIM. it doesnt have a deep wall. its just an edge really. I thought about jb weld but i dont know how i would get it from sinking.

    also can i reuse the stock gasket frame when i put the hv3 in ?

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  13. #13 Re: How to Mod a LIM 
    Turbo is the way to go. BillBoost37's Avatar
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    Drill and tap the same way I show in the pictures. The thickness of the manifolds are all nearly the same. Go slow on tapping and checking to see when the plug is nearly tight. That way you can control that the head of it sits flush.

    I don't know if you can reuse the gasket. Can't tell from here if your gasket is still good or not. If you are not sure, replace it for the peace of mind.
    I drink..so consider that when reading my posts.

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  14. #14 Re: How to Mod a LIM 
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    Any particular type of plug you used? Brass I'm guessing by the pics? Got a GenV and lim and plan to.get it.all done before it goes on. Good write up BTW.
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  15. #15 Re: How to Mod a LIM 
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    Hey Bill,the temp sensor you installed gets power from where? I only ask since it's an add on.

    Tia
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  16. #16 Re: How to Mod a LIM 
    Donating Users Taz Magister's Avatar
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    This is a very handy thread why is it not stickied?
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  17. #17 Re: How to Mod a LIM 
    GTX Level Member tayl5645's Avatar
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    This is intersting as ive been seeing an increase of misfires in the heat... out of cylinders 3 and 4
    2005 GTP Grey

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  18. #18 Re: How to Mod a LIM 
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    bill did you wire bruch or sand on the top? it looks like you did more than just powerwash
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  19. #19 Re: How to Mod a LIM 
    Turbo is the way to go. BillBoost37's Avatar
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    Plugs I used were brass, because Intrigue98 is an Engineer and said they should be dissimilar.

    Temp sensor.. uh early 90's 5.7 motor. Toughest part is getting the threaded one. I looked on Rockauto and can't seem to find it quickly.

    Tayl... some quench that with added fuel as well. Just on those cylinder though.

    Taz.. cause it's in the How to section. Can't sticky everything. And on the top. If I used anything it was a 3m rotolok disc. I have the brown..which is what most mechanics use for all their work. Gotta go easy on aluminum and soft metals.
    I drink..so consider that when reading my posts.

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  20. #20 Re: How to Mod a LIM 
    GTX Level Member tayl5645's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    Tayl... some quench that with added fuel as well. Just on those cylinder though.

    If I had the capability of tuning I would do that. But unfortunatly I dont. For now when its really hot im just babying her
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