A question: Did you notice your shift points changing with the PLIM?

After I installed mine, I now notice that my car will cross beyond the "yellow zone" and shift at 6000 rpm, every single time. Before I could not get it to shift beyond 5500 rpm to save my life.

Is it because the PCM recognizes that the car is actually making good power up there now?
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The PCM is complicated. You know that.

It'* looking at all parameters that deal with engine load to perform the shift at the right time. I'm not surprised at your discovery. It'* happened before. You're making better power into the band and beyond.

This is what the L36 was MEANT to be. And this is why I port manifolds. To show people what can be gained with little work. There are ALWAYS improvements to be made to factory parts. This has been my goal all along. To improve what we have FIRST to make the most of OTHER mods.

Now imagine putting rockers or a cam on that engine with the ported manifold.

If he'* getting this kind of performance out of a 97 PCM as compared to your very generous 95 PCM, we've proven the point.

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.

But the L36 is absolutely the worst factory porting on any OEM GM LIM. It'* just butt-nasty. Great gains for anyone that even did a half- job on one.

I'm hoping that my trans continues to hold up for a while! Nearly 144k on it, just changed the fluid and filter less than 1,000 miles ago. Still shifts nice and consistent, especially now with the 180 t-stat.

Ha, I'm already seeing the dollar signs flowing...

Someday, someday. At that point, as long as I had the time and money to do that, I'd probably spend the extra (and safe) buck to get the trans rebuilt with some kind of a 4T60 - HD kit. But that'* another topic for a future thread.

I have indeed been thinking of an Intense PCM, to cut out torque management. Been debating it in my mind this evening. Only thing holding me back is the price (I'm a very guilty and compulsive spender, an extremely bad combination I know) and the firmer shifts. Not that I debate the advantages it has, just that after having spent my entire life in jerky, clunky Honda autos, my rear is really taking a liking to these squishy GM gear shifts.

Basically weighing whether the advantages (power gain, throttle response if any) are worth the cost for me.
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well im happy youre plim whent well and you have good result the same thing happen to me that a must for any L36 now had some rocker and downpipe and hold on

Don't tempt me now...

I agree though, I don't know if I've said it yet but if you have an L36 the FIRST thing you should do (besides maintenance) is get a PLIM...you won't be really experiencing your car until you do and it pretty much multiplies the usefulness of any other flow related mods a great deal.

Honestly, I'm not so sure about my original plan to swap an L67 into this thing anymore, at least not until my current engine gives out. Not saying this makes up for the lack of a supercharger by any means, but it'* made me feel like this motor has a lot more potential than I did before.

Pump report:

With 30/70 city/highway driving and a fairly heavy foot at times, I got 27.25 mpg. This is an improvement over my previously observed 26.xx mpg with 20/80 city/highway and a somewhat less heavy foot. Both were on 10% ethanol. I finally found a station that doesn't put ethanol in their gas (Chevron) but not until after I filled up my current tank. It costs 20 cents a gallon more there but I despise ethanol enough that I might pay for it anyway.

More fill ups will be needed to get a better idea of mileage, but it seems to have increased.
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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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