Ported LIM - Page 7 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 05-05-2008, 09:39 AM   #61
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Quote:
Originally Posted by willwren
Funny you should mention the (off topic here we go) L27 LIM. I don't recall any more than one done before, and don't recall the road test results. I'd be tempted enough to port one for beer money.

NOW you say that, if I knew that I woulda got you to port mine for me. :P I guess ill be the 2nd with a ported L27. It might be a good comparison when I get the supporting mods for it
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Old 05-05-2008, 10:28 AM   #62
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Yours is a top-end transplant (not to mention your overported heads). I'd rather (no offense) try one for a stock L27. Too many odd differences with yours to draw a good comparison.
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Old 05-05-2008, 11:02 AM   #63
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Quote:
Originally Posted by willwren
Funny you should mention the (off topic here we go) L27 LIM. I don't recall any more than one done before, and don't recall the road test results. I'd be tempted enough to port one for beer money.
I started on my L27 manifold last year...never got around to finishing it. Now that I don't have a lot to do anymore...maybe I can find the time to complete it

It'* about 50% done.
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Old 05-05-2008, 12:29 PM   #64
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Aren't the L27'* better matched from the factory than the L36?

I'd be interested in seeing the results though. A friend of mine has an L27 powered LeSabre that could benefit from this if it turns out to be worth the effort.
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Old 05-05-2008, 12:43 PM   #65
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The castings are somewhat better, but there is still room for improvement. Esp. inthe runner department...the runners are rough-cast, which negates airflow. The runners can be smoothed and polished, and even deepend a little bit, and the ports can be widened as well.

I'll post pics of my progress when I get a chance to.
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Old 05-05-2008, 12:55 PM   #66
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Roughly the same mismatch as the L67. Not nearly as bad as the L36, but probably enough for you to feel it.
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Old 05-05-2008, 04:45 PM   #67
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Are you still running the stock PCM? If so, do you plan on changing it to match the radiator fan "on" temp. to 180?
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Old 05-05-2008, 05:21 PM   #68
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Quote:
Originally Posted by Barry
Are you still running the stock PCM? If so, do you plan on changing it to match the radiator fan "on" temp. to 180?
Yes, and no. I'm debating an Intense PCM, upon which I'd opt for the 180 fan switch.

I should post a baseline acceleration video to compare to the one I posted on the last page if I can find it, the difference should be easily noticeable.
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Old 05-05-2008, 05:25 PM   #69
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Quote:
Originally Posted by LeSabreUltra
Quote:
Originally Posted by firebuick
i did mine last year at the same time as replacing my lower gasket and that got me going into the mod bug and i was please whit a 14 sec run at the end of the year whit the mod i have in my signature

this year so far i have a HV3 install and my MPH whent up to 95.47 but i have some traction problem that should be fix now
I hope to be at that level someday...that'* very impressive though, right up (or down) there with stock L67 times. I wonder just how much potential an NA L36 has, if someone with more money than sense came along

Well guys, I finally have a full throttle video to share. This will give you a good idea of just how much this freed my car up. 700' elevation, 63* ambient air temp, level road surface in the country. Had to stop at 60 because I already got pulled over once tonight with a warning, I wasn't going to let it happen again.



You'll note I waited until 30 mph until I actually floored it...I was in "protect my car" mode. Burnouts are baaaad...gotta keep my trans alive and kicking!

Hope you enjoy, and maybe this will inspire someone else to do a PLIM.
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First.... I like the choice of Music... Steely Dan I think..

Second... Yes thats the difference I saw with my PLIM.... I was surprised to see how easily the car would pull to 5950 on the 1-2 shift... My Trans is still very tired tho.. I don't get the liberty of seeing the speedo move that fast anymore...LMAO...

And I also seem to have improved in Fuel economy.. 21 is the norm in town... And 32 is the norm on the interstate if I can keep my foot off the floor

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Old 05-05-2008, 08:00 PM   #70
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Hmm, the fuel economy alone warrants this mod. I get about 18-19 in town and 30 highway. Seeing even low 20'* around town would be fantastic.
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