Sentientbydesign
Articles Manager
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4948 posts
05 G35 6MT coupe, 00 Celica GT 5MT
Riverside CA
2-2-2005
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| « Re: cruise control adjustment on 03 m45 (saeedakobiakov) | 3:22 PM 7/25/2008 |
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What do you mean by better accuracy? You want it to "stick" to the MPH that you set and not deviate?...Drive on level ground lol. But seriously, what are you referring to?
Blox 5/8" Plenum Spacer ~ K&N Drop In Filter ~ Hawk HPS Pads ~ Charcoal Grounding Wires ~ Smoked Tails ~F/S:G35/350Z/FX35/Altima Grounding Kits What are you running? Brake Setup Poll -- Plenum/Spacer/Intake Manifold
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Q45tech
Q45 Guru
Offline
12243 posts
1990 Q45 319,000 miles
Marietta , Georgia
4-30-2002
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| « Re: cruise control adjustment on 03 m45 (Sentientbydesign) | 5:45 AM 7/26/2008 |
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In top gear there is not enough torque to instantly correct for the major differences going up and down inclines create.The only way would be to cruise in a lower gear which would wreck MPG. The system tries to avoid a transmission downshift unless abosolutely necessary. http://ocw.mit.edu/NR/rdonlyre...c.pdf http://www.ictct.org/workshops...n.pdf
http://www.t3auto.com/
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saeedakobiakov
Offline
177 posts
04 M45
GLOSTA MA
2-8-2008
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| « Re: cruise control adjustment on 03 m45 (Sentientbydesign) | 12:12 PM 7/28/2008 |
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that is corect, stick to the speeds i set it at..
there are two different pully things that connected to the throatle body. i was thinking of messing around with the one that not conneted to the gas pedal.p.s.
grounding wires on your car, what do you think?
should i get them for my car?
would you get it again for your next car?
ARE THEY WORTH THE MONEY?
THANKS,
CAUG.
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Q451990
Old School Q Guru
Offline
6103 posts
1990 Q45 - 91K, 2005 G35 Sedan - 32K, 1997 Nissan Truck - 133K
Columbia, SC
7-23-2002
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| « Re: cruise control adjustment on 03 m45 (saeedakobiakov) | 8:55 PM 7/28/2008 |
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I wouldn't start messing around with the throttle body. How much variance do you have at cruise? I would say +/- 3 MPH from your setpoint is about normal... My mom used to have an '88 Maxima that would downshift on almost every hill... trust me, the way Nissan does it now is much better.Heath
1990 Infiniti Q45 - AKA "Q2"
2005 Infiniti G35 - Sedan A/T FOR SALE
1997 Nissan Truck - XE - 5 Speed M/T
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Q45tech
Q45 Guru
Offline
12243 posts
1990 Q45 319,000 miles
Marietta , Georgia
4-30-2002
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| « Re: cruise control adjustment on 03 m45 (Q451990) | 6:30 AM 7/29/2008 |
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If you set tranny in 4th gear instead of overdrive you will see a narrowing in speed deviation as the lower gearing increases torque by 20%.
Remember overdrive actually decreases rear wheel torque.
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Sentientbydesign
Articles Manager
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4948 posts
05 G35 6MT coupe, 00 Celica GT 5MT
Riverside CA
2-2-2005
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| « Re: cruise control adjustment on 03 m45 (saeedakobiakov) | 12:49 PM 7/29/2008 |
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| Quote, originally posted by saeedakobiakov » |
p.s.
grounding wires on your car, what do you think?
should i get them for my car?
would you get it again for your next car?
ARE THEY WORTH THE MONEY?
THANKS,
CAUG. |
I sell the kits, so I'm a bad person to ask hahaha. I personally think my kit is worth every penny (And the kit I have installed on my car is lower in quality and higher in price than what I actually make and sell). I built my kit (with tons of research) as a project. I later realized that I over paid for my supplies and could have used better materials (which I do now). The engine revs faster, my audio sounds cleaner (which has temporarily put off my need to upgrade). On the automatics, they shift faster and smoother. Get me an M member in SoCal and I'll build a kit for your cars 
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texasoil
Offline
830 posts
fine cars, golf
Houston
9-2-2002
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The Q45a cruise control has a long 'integral' interval in the 'proportional,integral, derivative (PID) controller logic. The 'P' adjusts throttle opening proportionally to the error, the I accumulates the error 'amount * time' and adjusts P to zero out the accumulation, and the 'D' senses how fast the error is increasing or decreasing and moderates the throttle opening to smoothly approach the set speed (zero error). While this smooths out sudden throttle moves, it does allow speed to droop or swell a bit as you go up and down grades. It you notice--it will droop 3-4 MPH and then get back to set speed in about 6-8 sec. Same reaction going downhill. IMHO, not worth fooling with.
Texasoil
activesuspensionsystems.com
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SteveTheTech
Articles Manager
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1436 posts
Alexandria VA
8-16-2008
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| « Re: cruise control adjustment on 03 m45 (saeedakobiakov) | 4:06 PM 8/23/2008 |
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| Quote, originally posted by saeedakobiakov » | that is corect, stick to the speeds i set it at..
there are two different pully things that connected to the throatle body. i was thinking of messing around with the one that not conneted to the gas pedal.
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That is not really advisable don't adjust the lines there, you may run into a problem when your driving(stuck throttle) or throw off you closed throttle position sensor, base idle depending on the extent of "adjustment" you perform. I didn't see you mention whether you had Intelligent Cruise or not?
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szhosain
Super Moderator
Offline
12384 posts
2003 M45. Brilliant Silver.
San Jose CA
7-23-2002
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Similar answers in this earlier thread too  : http://forums.nicoclub.com/zerothread/354261.Z
Our M35/45 Forums: M35/45 at NICO, M35forum, and M45forum! ... Infiniti Service Manuals are available here!
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