Sweet deal man. I'll do this today and get back to you on the results. Can't wait.

I've been trying left and right to wake up this engine a bit and nothing has made a big difference. Hopefully this small modification will bring out the potential of the rockers, CAI, exhaust, and ported Lim I have on there. hi5.

I'll get back to this thread later tonight on how it all works out.

So I've done it all. Is this what you were telling me to do?



I put it back in, went out for a drive, and noticed a slight increase in top end power. Not sure if its just me thinking there was an increase, but there certainly wasn't a decrease.

Perhaps I have to drive more to let the PCM get used to the changes. I didn't disconnect the battery after I did this. Should I have?

Yep, that'* what I was getting at. You could go further and remove the vertical sides of the runner that are perpendicular to the TB entrance.

In retrospect, I should have told you to scan for your maf flow vs. rpm at WOT before and after so you can see if you're pulling more air.

And as far as the pcm goes it wouldn't hurt but unless you're getting knock, you're probably at the mods peak potential.

Another thing is, if you can get a radius on the opening (especially near the center) you would get even more flow. You would be on your own for this though.

Sounds good. I'll cut off the sides and make a radius at the entrance tomorrow. I'm getting so damn fast at removing my UIM its not even funny. I think yesterday was the 4th time I've taken it off. I did it once to replace the LIM gaskets, a second time to attempt to fix a throttle body passage leak, a third time to do the same and have it fail, and the last time, during which I also plugged up the coolant passages because I got fed up with the UIM and the coolant leaking. I think I can get the whole thing off now in 15 minutes.

One big thing I noticed while looking at the L36 LIM. The runners on the L27 are a LOT longer.

Compare the two:

L36 LIM:


L27 LIM:


And to think that ZZP cut off 3" from their runners? Those are some extremely short runners.

The L27 runners are longer in the LIM but the L36/L27 runners are longer in the UIM:



And how do you plan to make a radius? epoxy?

Wait...what exactly do you mean when you say a radius?

Like a bellmouth.

Ah, gotcha.

I'll be thinking about that for a while.

Do you think its worth it to pull the UIM just to cut off the sides?

I'll have to some planning on a way to create that a bellmouth type attachment.

Maybe do some planing about bell-mouthing the entrance and cut the sides at the same time?

Sounds good. I have to change the oil on my Bonneville today anyway. 8 quarts of full synthetic ain't cheap.

I'll let you know what I come up with when the time comes.