little random post

[robertisaar]

http://www.realfierotech.com/phpBB/viewtopic.php?t=7468&start=0&sid=4a884d3ef3df73811f6b4f4ab70e3eb9

16196387:
1994-95 Buick Century and Olds Cutlass Ciera 3100 V6 SFI MAF 4T60-E ($1FA code mask; 32kb). Inside mount only - 7730 look-alike box.

16196401:
1994-95 W-body LQ1 3.4 DOHC SFI MAF 4T60-E (early uses $1FA, others use $2E code mask; 32kb). Underhood mount - 16149396 look-alike box

i have never heard of any 94-95 LQ1s running 1FA, but i guess it's possible...

[robertisaar]

totally unrelated to previous post, but the 3900 VI operation seems odd to me...

this is supposedly how the 07 G6 3900 operates:

valve open(short runner):

engine not running
idling/driving with low throttle and less than 2500RPM
throttle between 45-65% RPMs under 3500
throttle above 65% and RPMs above 3500
WOT
decelerating with no throttle

valve closed(long runner):

throttle above 45% and RPM above 1000

some of it seems ass-backwards to me.... like why is the short runner being used for decel, idle and low throttle...

and valve feedback? is that suggesting it's PWM?

[86FieroSEv6]

Wouldn't the short runners give better tip-in throttle response and then shift to long runner for maximum mid-range torque?

[robertisaar]

the shorter runners are better for high-RPM HP, and the long runners are better for low-RPM torque...

[86FieroSEv6]

That is true generally, but I bet they found that shorting the runners below a certain throttle angle initiated air movement sooner, thereby boosting the long runner effect during tip-in.

[robertisaar]

i guess it's possible... especially since during cranking it supposedly opens the valve by 10%. same kind of situation: going from a steady airflow(0 while not running), to a rather large increase instantly(30-40 grams/sec(est.) right after firing), just like snapping open the throttle...

[86FieroSEv6]

This is giving me a headache . . . . . . where's my Victor Jr. and Holley?!? LOL

[SappySE107]

I wouldn't repeat anything sinister posts.

[robertisaar]

I wouldn't repeat anything sinister posts.

did i miss something?

[SappySE107]

Probably not.

[Superdave]

I wouldn't repeat anything sinister posts.

agreed

[robertisaar]

now the sinister stuff makes sense...

and since this thread is full of randomness already:

https://www.robertisaar.co.cc

i have 1500MB to use up and haven't even gotten to 10MB yet...

[robertisaar]

http://robertisaar.co.cc/index.php?p=1_15

Pocket-Rocket should like this...

[pocket-rocket]

Wow, that bar in there kinda messes that thing up, huh? Good job on observations and a good write up (brownie points for bashing Fram ).

[robertisaar]

thought you might like that...

honestly, that thing was horrible... and i can only imagine how many junked engines can be attributed to that crap. i've got a TG3980 on the GP now... it costs liek 3X as much, but i have a feeling it won't be worth it once i tear it apart....