Cascade Crew

91camaro_rs · Posted: Thu Oct 29, 2009 10:48 am Post subject: timing

when i drove to seattle the other day i noticed that cruising at 70mph i was at about 1900 rpm, and i dont remember what i did that changed it, but it used to cruise at 70 at like 1600rpm.and i do remember before my timing chain broke i had the timing advanced. so is that why i could cruise at a lower rpm is because of the timing? that might have been before i got the new tranny too...not sure tho

Quasi-Traction · Posted: Thu Oct 29, 2009 10:54 am Post subject:

I would look to the tranny. I don't know of any way that timing could effect your RPM at cruising freeway speed.

Also the factory tach is not the most accurate instrument, as it is.

aaron_sK · Posted: Thu Oct 29, 2009 11:09 am Post subject:

Tire temp.

On hot days the IROC used to lose around 200rpm on the freeway. Colder temps = smaller tire diameter. Smaller tires = more revs.

91camaro_rs · Posted: Thu Oct 29, 2009 11:24 am Post subject:

hmmm maybe my different rims and tires made a difference also

and yeah the stupid tach, i had to do the resister mod in order to get it to work

could the exhaust have an affect? cause i dont have leaks or a cat anymore

rjmcgee · The Hammer Joined: 08 Jan 2004 Posts: 2328

aaron_sK · Posted: Thu Oct 29, 2009 7:06 pm Post subject:

QwkTrip · Posted: Thu Oct 29, 2009 7:10 pm Post subject:

aaron_sK · Posted: Thu Oct 29, 2009 7:16 pm Post subject:

QwkTrip · Posted: Thu Oct 29, 2009 7:29 pm Post subject:

Well if that's the case then you need to quit buying your tires from Harbor Freight.

aaron_sK · Posted: Thu Oct 29, 2009 7:31 pm Post subject:

QwkTrip · Posted: Thu Oct 29, 2009 7:35 pm Post subject:

I can see that you're not having as much fun with this as I am. Laughing

91camaro_rs · Posted: Thu Oct 29, 2009 8:02 pm Post subject:

i did get a shift kit with my newly rebuilt tranny, would that have an affect on the RPM's

aaron_sK · Posted: Thu Oct 29, 2009 8:14 pm Post subject:

91camaro_rs · Posted: Thu Oct 29, 2009 8:55 pm Post subject:

i have no idea what happens when it locks up or taking longer. taking longer to shift? what does it do when it locks up?

QwkTrip · Posted: Fri Oct 30, 2009 4:09 am Post subject:

The torque converter is a viscous fluid coupler that transfers the engine rotating energy to the transmission. In normal operation it slips some. Your stock torque converter should have a "lock up" that will cause it to not slip when cruising at light throttle. It is worth a few hundred RPM drop in engine speed. If you put a new transmission in then my guess is that you have a torque converter that lacks a lock up, or you didn't get it installed correctly.

91camaro_rs · Posted: Fri Oct 30, 2009 12:01 pm Post subject:

hmmm, so having a lock up is a good thing then, i wonder if i can take the car back to the place i got the tranny and have em check it out

QwkTrip · Posted: Fri Oct 30, 2009 3:01 pm Post subject:

So does that mean you know what kind of converter you have?

It's only bad if the converter is supposed to lock up and it doesn't. If it's a non lock up converter by design then it is operating fine. Just realize that with a non lock up converter you won't get quit the fuel economy that you used to in the past. It might not hurt to add a transmission cooler as well. Maybe not necessary but good peace of mind.

91camaro_rs · Posted: Fri Oct 30, 2009 7:21 pm Post subject:

I e-mailed the tranny shop, so ill see what i got when they reply, is a tranny cooler easy to put in? do you use the same lines that go into the radiator

aaron_sK · Posted: Fri Oct 30, 2009 8:55 pm Post subject:

91camaro_rs · Posted: Fri Oct 30, 2009 9:56 pm Post subject:

alright sweet