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Old 07-03-2005, 03:04 PM   #1
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Default LX5 VS L36

Thought some might be interested to see a comparison powerchart for the L36 engine and the LX5 (DOHC 3.5L). I'm still curious as to why more brands didn't use it. The graphs speak for themselves.. Both engines have been on the "10 best engines" list.

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I also made a graph overlay of the two engines. Did the best job I could with it, I'm not used to doing something like it.
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Old 07-03-2005, 04:59 PM   #2
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Notice that, although the 3.5 has 10 more hp, the hp and torque peaks are 400RPM higher.
Thats a big difference in daily driving behavior.
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Old 07-03-2005, 05:27 PM   #3
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The one thing I have wondered is why the 3.5 was dropped from the lineup.... Its not an olds engine as we all know... Caddiliac makes it... Why did GM drop this engine...?

I see that Chevy has a 3500 V6 that is being used in a few platforms... Seems like the shortstar would have made it a lot more fun... But instead of the 4T45-E it would have to be attached to the larger 4T65-E... Would have made for some hell bent Malibus tho

And yes I see how close the engines are in comparision... Neat to see

Another stupid question.... what was the heaviest ratio that the 3.5 was attached to?

I have seen the 3800'* attached to 2.84, 2.85?, 2.93, 2.97, 3.05, 3.06 and in the early years 3.33( ran out of breath too soon for this gear ratio, but made for fun tire spinning )

What was the 3.5 attached to? 3.05, 3.29, 3.71 ? I think a 3.29 would be the limit on a 3800 II.... 3.71 would be nuts attached to a 3800 ( red wouldn't be high enough )

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Old 07-03-2005, 09:47 PM   #4
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3.71 and you would be cruising on the interstate at like 3000+RPM!
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Old 07-03-2005, 11:06 PM   #5
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The DOHC engine is much larger and probably weighs damn near the same. There'* no real reason to have both of those engines at the same time, but the 3800 also has the L67 that shares parts easily with it sooooo.

Both aren't gonna be used soon though anyways
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Old 07-04-2005, 02:04 AM   #6
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Remember that the LX5 is all alluminum too which is much much lighter than the cast iron block and heads of the 3800. The 3.5 doesn't appear bigger than the 3.8 either when comparing them side by side. I think all 3.5'* came with the 3.27 gear ratio. When you drive our 2000 SLE Bonneville, then drive the the Aurora, the Aurora has much better top end, and the low end even feels peppier. It has less torque at the low RPM'* but I'm pretty sure that the lighter weight, plus the gear ratio helps to make up for it. This isn't just an Aurora owner saying this either, my brother, who owns the 00 SLE agrees too that the 3.5 is much peppier in all driving conditions. I've heard that the 3.5 was too expensive to make and that'* why it was discontinued. I don't know just how true it is, but I can believe it.

EDIT: I read somewhere also that originally this engine was supposed to be closer to 250 horsepower but due to transmission limitations it wasn't made that way. Also, this engine was only made from 1999-2002. I don't think it was used after 2002.
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Old 07-04-2005, 02:36 AM   #7
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It'* a DOHC motor so it'll be much bigger up top.

For reference a 4.6L DOHC vs a 5.0L (both fords). The smaller displacement engine needs a larger head, block, timing setup, etc. You are right about the All iron block being heavy, i've lifted a series I block with crank and cam inside....



Just saying it'* bigger , i like those 'lil buggers, but now we got the 3.9 or the 3.6vvt
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Old 07-04-2005, 09:52 AM   #8
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Quote:
Originally Posted by Custom88
EDIT: I read somewhere also that originally this engine was supposed to be closer to 250 horsepower but due to transmission limitations it wasn't made that way. Also, this engine was only made from 1999-2002. I don't think it was used after 2002.
Maybe this is why it wasn't used in the 2000+ bonnevilles... I have an article somewhere that talks about the new for 2000 bonneville having the 3.5 shortstar engine in it replacing the 3800....

And from what I see in your video, it looks like they set the 4T65-E up for everything it could handle.... Was that a 6300-6500 shift? I will give you this tho... That thing was hella happy to wind out...

I still feel that each engine has its ups and downs...

And I know I have asked this before, as the 3800 will see its demise soon....

There is a 3.6 vvt like jason stated... But I have heard a bit about a 3.9.... Is this 3.9 a DOHC 3.9 or is this a punched out 3400/3500 set up to make 260 hp?

The Malibu bone stock with the 3500 produces 200 Hp and 220 ft lbs.... So will the 3.9 be a 3900 60* V6?

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Old 07-04-2005, 12:17 PM   #9
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Quote:
Originally Posted by jr's3800

And from what I see in your video, it looks like they set the 4T65-E up for everything it could handle.... Was that a 6300-6500 shift? I will give you this tho... That thing was hella happy to wind out...
at WOT it only shifts at 6,200 RPM even though the engine itself redlines at 6,600. :( THat'* really unfortunate seeing as it makes it'* max power even above the 6,2000 RPM shift point. If you look at the chart, the HP doesn't start going down even at redline. that engine is capable of power much higher than what it'* allowed to rev. also, the way I see it, the low end torque of the 3800 is nice around town, but, what do you use more? Low end grunt for dead stops, or the high end power which you would use during passing maneuvers? I'd honestly rather have the extra horsepower while passing, then a little extra torque from a dead stop.
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Old 07-04-2005, 12:34 PM   #10
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Quote:
Originally Posted by jr's3800
There is a 3.6 vvt like jason stated... But I have heard a bit about a 3.9.... Is this 3.9 a DOHC 3.9 or is this a punched out 3400/3500 set up to make 260 hp?
Still pushrod and 3100/3400/3.5 based, as far as I know



Quote:
It'* a DOHC motor so it'll be much bigger up top.
Valvetrain layout isn't the only factor. You've still got cam profiles, number of valves, blah blah. DOHC 2-valve motors have existed, *looks at avatar*
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