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Old 05-04-2007, 01:02 PM   #1
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Default Ported LIM plus front PEM test data

In a past thread I detailed my home-ported LIM, including test data on that mod alone:
http://www.bonnevilleclub.com/forum/...ic.php?t=72094

I hijacked this thread to talk a little bit about my home-ported (a.k.a., "fake") front exhaust manifold:
http://www.bonnevilleclub.com/forum/...ic.php?t=77287

Well, I finished the VE tune on the ported LIM (PLIM?) and front PEM combo, and here'* the graph:


As with all the previous tuning, this was done at 70-75 degrees F (73, in this case).

This shows an additional, substantial, increase across the entire powerband from 3200 to 5600 rpm (and perhaps beyond; stock rockers/valvesprings are holding me back!) when adding on the PEM.

OK, now I'm not saying that the PEM by itself is responsible for the difference between the pink line and the yellow line...rather, I think that the PEM is "unlocking" some pent-up potential of the ported LIM. In other words (with apologies to John Lennon):

Synergy...
All my mods are working great for me.
She is twice the car she used to be...
Oh, I believe in synergy.


So, according to the calculators, what I've got here is:
-Torque peak around 4200 rpm, with an estimated peak increase from 230 ft lb (stock) to about 270-275 ft lb (PLIM plus PEM)
-HP peak around 5200-5400 rpm, with an estimated peak increase from 205 hp (stock) to about 225-230 hp (PLIM plus PEM)

It'* almost unbelieveable, but the VE data says I'm nearly into stock */C territory here with these two cheap, home-made mods.

MAF, KR, O2 and spark info will be posted as those parts of the tune get done.
(If previous trends hold, my max MAF Hz reached should go from 9000 Hz with PLIM to something like 9500 Hz with PLIM plus PEM)
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Old 05-04-2007, 01:21 PM   #2
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Nice looking numbers, but be careful with estimates. And not really nearly into L67 territory. Remember that the L67 develops it'* peak torque VERY low and holds it flat all the way through. That'* totally different than a peaky peak.
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Old 05-04-2007, 01:30 PM   #3
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Good to know some 'fake' mods work that well.
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Old 05-04-2007, 01:38 PM   #4
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What I wanna see is that sucker hit a dyno like that, and see how your VE numbers relate. It would be nice to be able to characterize these mods with VE and actual dyno numbers, as well as track.
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Old 05-04-2007, 01:46 PM   #5
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Quote:
Originally Posted by willwren
Nice looking numbers, but be careful with estimates. And not really nearly into L67 territory. Remember that the L67 develops it'* peak torque VERY low and holds it flat all the way through. That'* totally different than a peaky peak.
I am a bit peaky, and I am hoping that further mods will smooth that out, especially at the higher end (e.g., I think my stock TB/intake may now also be holding me back in the 4500-5000 rpm area, and that my old, tired, stock valvesprings are causing valve float as low as 4000 rpm that just gets worse as rpm'* increase).

These results are also causing me to reevaluate how I'm going to go about modding the UIM, as I want to avoid significantly raising the peak torque rpm. To the contrary, I'm now thinking of something with the UIM that might increase VE at the low end. Luckily, I've got two complete UIM'* sitting in the garage to hack up!

As for estimates, I promise that when I get ALL (or at least MOST) of my mods done, I'll spring for some dyno runs--in part to see if my estimates are anything close to reality

And yeah, I'm hoping to get some track time somewhere along the line, even if I have to drive to Phoenix to meet up with some of you AZ guys. Besides, a former co-worker I occasionally go fishing with just ordered a Lexus IS he thinks is gonna be the ***t (unfortunately, I forgot to ask if it was a 250 or a 350 )

Please note that my estimates are, like the published stock data, crank numbers, not wheel numbers.
What'* your call on a fair drivetrain loss percentage estimate? 20%? 25%?
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Old 05-04-2007, 01:52 PM   #6
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Thanks for the VE numbers Agrazela! They sure begin to show the relationship some of us have felt with our completely unscientific butt dynos.

I found it interesting to read your values between the PEMs and the PLIMs. IMO, this shows that these are complementary mods with one needed to bring out the potential of the other. The reason I say it that way is that some of us (if not most so far except you) have started with the quicker (meaning faster to thrown on the car) PEM mod first and have felt good gains. Then added the PLIM later to feel some serious gains above and beyond those felt with just the PEMs alone.

This makes sense even if none of us have done any testing to show the numbers.

Thanks again!
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Old 05-04-2007, 02:00 PM   #7
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WOW! This affects my priority list and what order I'll add mods! IMPRESSIVE!!
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Old 05-04-2007, 02:01 PM   #8
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Quote:
Originally Posted by lash
...I found it interesting to read your values between the PEMs and the PLIMs...
You said "PLIM"...does this mean I get credit for coining a new acronym?
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Old 05-04-2007, 02:04 PM   #9
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Well, after reading this i cant wait to have the bonneville tranny back in and be able to mod the motor some more. Those are nice numbers, but i would also like to see some dyno numbers. I imagine adding a PLIM (haha, i like that) to my PLOG and ER rockers, would give me a nice kick in the @ss. Also doing the ZM TB mod would change those numbers even more for the better.

PS- I feel so bad for newbies, with all these letters and abbrevations they must be so confused.
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Old 05-04-2007, 02:06 PM   #10
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Quote:
Originally Posted by agrazela
Quote:
Originally Posted by lash
...I found it interesting to read your values between the PEMs and the PLIMs...
You said "PLIM"...does this mean I get credit for coining a new acronym?
It works for me!

Anything to keep from typing too many more words than necessary. I'm wordy enough now as it is.

...plus it just plain makes sense and is a natural extension of the use of PEM.
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