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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 03-19-2008, 07:53 AM   #1
 
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General cam question....

Do the 264 and 276 cams perform the same at idle, and if so, at what RPM do the intake and exhaust differences start to make themselves known?
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Old 03-19-2008, 07:57 AM   #2
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My 264 cams idle pretty good on start up and then lope a little when warm, but I think I have a bad o2 sensor. Nick said his Viggen idles fine with 264, but had a little issue with the 276 cams with nira...

PS. My gt3071 died this morning, sounds like scraping metal or an idler pulley gone bad! It only lasted 4 months after having it rebuilt with new compressor blades.

Dangit....

John
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Last edited by JZW; 03-19-2008 at 08:00 AM.
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Old 03-19-2008, 08:03 AM   #3
 
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I remember reading that, but I didn't know if it was a Nira issue or a cam issue....
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Old 03-19-2008, 08:50 AM   #4
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It really depends on how you time them. That ultimately is the main variable. When you get to aggressive the vac at idle drops lots. so you have relatively big airflow changes with little MAp change. Just makes it hard to control.

For a street car I would go with the 264s. But thats just me.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 03-19-2008, 11:00 AM   #5
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I remember reading that, but I didn't know if it was a Nira issue or a cam issue....

Nir or other EMS idle issue are many times influced by improper tuning of idle, i.e if cams are not clocked with crazy open values at TDC both the 268 and 276's will idle just fine. I my case the idle rpm is <+-15rpm from set value.

On other thing to consider is the rev limiter, if not set up to 6.5+k rpm the 276's you will hardly get any benfit from the 276's compared to 268's but will loose more of the bottom.
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Old 03-19-2008, 11:56 AM   #6
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Quote:
Originally Posted by JZW View Post

PS. My gt3071 died this morning, sounds like scraping metal or an idler pulley gone bad! It only lasted 4 months after having it rebuilt with new compressor blades.

Dangit....

John
that sucks how did that happen.
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Old 03-19-2008, 12:01 PM   #7
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Old 03-20-2008, 11:45 AM   #8
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that sucks how did that happen.
Don't know for sure, but will have it open this weekend and see if I can figure out what happened. It was making some light noise from contact right after I got it back from the rebuild. I could hold it in one position and it was quiet, hold it in another and it would make a slight rubbing sound.

I think it just slowly ate itself and became more and more out of balance and would make more and more contact.

Time to put the gt3076 on there!

Johhn
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