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Old 05-26-2009, 10:13 AM   #35
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Originally Posted by MadMaxx View Post
The DI motor does have a high static CR, but you got to remember that it's making those numbers on 87 octane. The DI bit pushes the normal CR boundaries quite a bit, even under turbo applications.

Static CR itself isn't the problem, it's the ability to fine tune that defines how well a forced induction system runs. Lowering the CR gives you more of a safe-zone for screw ups vs. running right on the edge of a FI+high CR situation. Hell, I've seen some 12:1 CR port injection motors w/ full turbos put out insane numbers and still be well within limits -- it's all in the tune. One major advantage (as I see it) is the hardware already present from a computer standpoint...the Motec ME9. This little bastard is capable of a super high degree of monitoring and correction, especially compared with older technologies. It's like Atari vs. Xbox360 man, crazy stuff. That was the biggest problem w/ DI up until the last few years -- having an ECU with enough power to control the system, and still be commercially cost effective.

From a mechanical standpoint, the V6 bottom end is forged, pistons are aluminum w/ heat coating to deal with the stress of DI. They also have factory oil squirters ...

Now, if they'd only come out with the 7.2L V12 engine... that would be a hellova lot of fun to tune.
This.

With out overextending too much the DI means that you're not taking air and fuel on the intake stroke. It's just air. So carbs are like air/fuel mixing centers port injection is shooting atomized fuel with the air and compressing it all on the compression stroke.

Fuel is a liquid and can't be compressed as much as air. So with direct injection. You have nothing but air being compressed and as the air is compressed you have all that pressure in the chamber and THEN the fuel is injected and ignited.

Compression needs to be payed attention to, but it's not as important on carb or port injection methods. Which is why you can run such a high compression. It's all air being compressed. The only thing you really need to worry about is can the internals handle all the energy happening in the combustion chamber.
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Old 05-26-2009, 10:31 AM   #36
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Cool to see these numbers. Interesting how they are getting good mileage with the rich tune. I wonder what a good tune will do for for MPG's as well as power?
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Old 05-26-2009, 11:25 AM   #37
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The Tranny...

What about the transmission with these mods? What do you guys think will need to be done?
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Old 05-26-2009, 11:29 AM   #38
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What about the transmission with these mods? What do you guys think will need to be done?
Depends on power numbers. Obviously the 6L50 has a lower input limit than the 6L80.... maximum gearbox toque rating was around the 480lbs mark.

Tranny coolers are always cheap insurance. No one has an aftermarket stall listed for the 6L50, and I believe it uses a smaller TC than it's 80 cousin...

The asin 6spd on paper has a low tq rating, but I believe it's just a rehashed version of the R154 internals w/ an additional gear. I'll have to dig out the specs.
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Old 05-26-2009, 12:15 PM   #39
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Those A/F numbers look like it is already tuned for boost! I would like to see what kind of power it would make at 12.5.

Also, the way the AF curve slopes down, it might have a "PE vs. Time" table that keeps on adding fuel the longer you are in it. I had that on my 04 GTP and it was a bear to tune.

-Geoff
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Old 05-26-2009, 12:35 PM   #40
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Those A/F numbers look like it is already tuned for boost! I would like to see what kind of power it would make at 12.5.

Also, the way the AF curve slopes down, it might have a "PE vs. Time" table that keeps on adding fuel the longer you are in it. I had that on my 04 GTP and it was a bear to tune.

-Geoff
+1

Thats the way the cobra's are, except it's more ubrupt.
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Old 05-26-2009, 12:43 PM   #41
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G-bodies are also solid axles with a thousand pound weight difference.

But you are right, the 3800 is an old, old design.
GM first came up with this engine in the '60s. Sold it to Kaiser who put it in some Jeeps. AMC bought Kaiser and later sold the design back to GM
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Old 05-26-2009, 12:45 PM   #42
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+1

Thats the way the cobra's are, except it's more ubrupt.
Got a link for a stock cobra to see the differences or at least what RPM the abruptness started? Also a GTP I'd be curious at seeing the differences in A:F. If it's jus a measure to keep it from leaning out at the top end and cause detonation.

The reason I ask is because if it's running this rich it might not be a complete burn of the fuel. So residual fuel would be accumulating to a point.
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Old 05-26-2009, 12:48 PM   #43
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GM first came up with this engine in the '60s. Sold it to Kaiser who put it in some Jeeps. AMC bought Kaiser and later sold the design back to GM
Well no wonder it's a strong engine! It potentially powered a Henry J! Quick someone put a full tilt TA performance crate engine in one!
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Old 05-26-2009, 02:57 PM   #44
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Got a link for a stock cobra to see the differences or at least what RPM the abruptness started? Also a GTP I'd be curious at seeing the differences in A:F. If it's jus a measure to keep it from leaning out at the top end and cause detonation.
I will shoot you a screenshot of the table when I get home tonight.

-Geoff
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Old 05-26-2009, 03:01 PM   #45
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The CTS tested higher with the same engine. I wonder why?
Baseline run: vehicle produced 263.0 rwhp and 241.7 lbs/tq.
With a CAI and corsa exhaust(no other tuning) it tested
294.2 rwhp and 261.3 lbs/tq

Post #24 here:

http://www.gminsidenews.com/forums/f...33/index2.html
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Old 05-26-2009, 03:17 PM   #46
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The CTS tested higher with the same engine. I wonder why?
Baseline run: vehicle produced 263.0 rwhp and 241.7 lbs/tq.
With a CAI and corsa exhaust(no other tuning) it tested
294.2 rwhp and 261.3 lbs/tq

Post #24 here:

http://www.gminsidenews.com/forums/f...33/index2.html

Manual transmission, no listing of ambient temp... dynapack historically read higher than mustang, etc. etc.

Mustang dyno's are known as the "hearbreakers" for a reason I'd rather know my as-close-to-real-world-as-possible numbers.
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Old 05-26-2009, 03:36 PM   #47
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Manual transmission, no listing of ambient temp... dynapack historically read higher than mustang, etc. etc.

Mustang dyno's are known as the "hearbreakers" for a reason I'd rather know my as-close-to-real-world-as-possible numbers.
Kewl, thanks!
This tuner talk is new to me but I'll be watching and learning
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Old 05-26-2009, 03:42 PM   #48
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You can't even compare the same dyno manufacturer from shop to shop let alone different dyno's.

Maddmaxx is the only one who took his in so that's all we have to base it off of. Which makes him the man by the way.

Ambient temps, elevation, humidity, and all sorts of variables will always produce different results.
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Old 05-26-2009, 04:13 PM   #49
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Kewl, thanks!
This tuner talk is new to me but I'll be watching and learning
I'm in the same boat.

AFR ECU CAI.. Ass sphincter says what?

I'm learning
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Old 05-26-2009, 05:33 PM   #50
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Didn't I read somewhere that the ECM sets a rich mixture for so many miles on a new engine?
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Old 05-26-2009, 05:44 PM   #51
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Are you sure these can be tuned? No ones been able to tune the new style PCMs on the Pontiacs yet. At least, no one in the Grand Prix sites I frequent.
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