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  #11  
Old 11-11-2010, 12:31 PM
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Originally Posted by subzali View Post
Nay, what is this fuel vapor issue you're referring to for us non-80 educated?
right here Matt, see the mud link inside http://www.risingsun4x4club.org/foru...ad.php?t=14326


I'm curious what domestic vehicles have this engine.. can anyone name a few? Is it just the Chevy Trailblazer?
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  #12  
Old 11-11-2010, 12:36 PM
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Quote:
Originally Posted by subzali View Post
Nay, what is this fuel vapor issue you're referring to for us non-80 educated?
EDIT: Nakman beat me to it.

MUD threads document the debate:

http://forum.ih8mud.com/80-series-te...-pressure.html

http://forum.ih8mud.com/80-series-te...ine-temps.html

I'm a little bit paranoid about this, I admit, but with and kids onboard for most trips, it is a deal breaker. I have yet to see anybody propose an actual solution - it's either "debate the conditions that cause the issue" or "fuel is what it is, live with it".

FWIW, I have never had a high pressure issue in the tank, just smell from the engine bay (even after buying a $280 OEM replacement charcoal canister).
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  #13  
Old 11-11-2010, 12:38 PM
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Originally Posted by nakman View Post
right here Matt, see the mud link inside http://www.risingsun4x4club.org/foru...ad.php?t=14326


I'm curious what domestic vehicles have this engine.. can anyone name a few? Is it just the Chevy Trailblazer?
2002-2009 GMC Envoy, Envoy XL, and Envoy XUV
2002-2009 Chevrolet TrailBlazer and TrailBlazer EXT
2002-2004 Oldsmobile Bravada
2004-2007 Buick Rainier
2003-2008 Isuzu Ascender
2005-2009 Saab 9-7X
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  #14  
Old 11-11-2010, 12:43 PM
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Originally Posted by Nay View Post
2002-2009 GMC Envoy, Envoy XL, and Envoy XUV
2002-2009 Chevrolet TrailBlazer and TrailBlazer EXT
2002-2004 Oldsmobile Bravada
2004-2007 Buick Rainier
2003-2008 Isuzu Ascender
2005-2009 Saab 9-7X
So basically yes, just Trailblazer's, and its clones.

I was never impressed with the power of the I6 in the Envoys I sold while working at the GMC dealer in Silverthorne. Nor were many buyers. We sold far more V8's
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  #15  
Old 11-11-2010, 01:49 PM
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Originally Posted by Corbet View Post
I was never impressed with the power of the I6 in the Envoys I sold while working at the GMC dealer in Silverthorne. Nor were many buyers. We sold far more V8's
Here's the torque curve from the GM website (not power to the wheels off a dyno) - ignore the overlay, this came off TrailVoy and is not apples to apples. It is literally all I could find.

It's interesting as you read posts about the 4.2L I6 vs. 5.3L V8, you hear both sides. Some say the V8 is far better, some say there is no real difference in basic driving. Some claim to get the same fuel economy out of the V8, others say the I6 is better. A lot of people clearly prefer the V8 largely for its exhaust note, and readily admit it. Pretty much everybody on the TrailVoy forum acknowledges that the 4.2 shines at higher RPM (many say it only shines at higher RPM) - this is where I think about not being in overdrive on steep climbs and running at around 4K RPM for an extended period as needed.

Which leads me to believe it's a lot about how much you like an I6 as a platform vs. a V8 and what you use your rig for, understanding that any preference for the I6 is ultimately "thinking in support of feeling" (much like $12K diesel swaps ).
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  #16  
Old 11-11-2010, 03:16 PM
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So...

About 60 more HP but torque is almost identical except the max torque comes on later on the Chevy I6?

http://www.off-road.com/trucks-4x4/t...ons-19425.html
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  #17  
Old 11-11-2010, 03:59 PM
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I really like the v8 (vortec 5.3) I put in my truck....

i did all the work and I want to guess it was around 5-7k with a new h55f tranny included.

i can see upwards of 16mpg on the interstate with the 35's going 70mph but i rarely go that slow..

i learned a lot about the swap over the years (had it swapped for 4 years now and 80k miles) you are welcome to drive it any time or come by and look at it.
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  #18  
Old 11-11-2010, 04:35 PM
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Originally Posted by corsair23 View Post
So...

About 60 more HP but torque is almost identical except the max torque comes on later on the Chevy I6?

http://www.off-road.com/trucks-4x4/t...ons-19425.html
You have about 2.5K more RPM where the 4.2 is going to be pulling towards redline - imagine trying to run your 1ZFE at 4.5K-5K RPM.

This is generally spoken of "the area under the curve". The 1ZFE has a very narrow band where it feels optimal - for me that is 2,400 to 2,900 RPM. Under 2,400, it is an absolute dog, and 3K and over and it simply is not a smooth or quiet engine and it does not want to pull to redline - naturally aspirated, you pretty much start to hit a wall.

This is where max HP/Torque figures don't tell the story - the VVT on the 4.2L is reported to really kick in at 4K RPM. You aren't ever driving a 1ZFE in that range over distance, and the GM engine is really getting its legs in that range (according to what I am reading).

So being within 90% of max torque from say 1,600 RPM to 6,000 RPM is something that the 1ZFE is simply not capable of, and that is what is so frustrating about it - the narrow performance band when you also factor in NVH.

That all of this comes with materially better fuel economy is compelling - at least right now, on paper. It would also be compelling to buy Slee's SC, upgrade the cooling system, and be done with it
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  #19  
Old 11-11-2010, 05:25 PM
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Sorry for being stupid, but what's NVH?
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  #20  
Old 11-11-2010, 05:46 PM
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Quote:
Originally Posted by Nay View Post
That all of this comes with materially better fuel economy is compelling - at least right now, on paper. It would also be compelling to buy Slee's SC, upgrade the cooling system, and be done with it
I doubt you are going to get materially better fuel economy if you push that motor to 4k all the time. As for v8 vs i6, I would take the 4.7l toyota motor about the 1fz anytime. I am curious to get our swap on the road to see how it feels in the 80.
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