Diesel Bombers

Diesel Bombers (https://www.dieselbombers.com/)
-   1st Generation Dodge Cummins 89-93 (https://www.dieselbombers.com/1st-generation-dodge-cummins-89-93/)
-   -   top speed (https://www.dieselbombers.com/1st-generation-dodge-cummins-89-93/107766-top-speed.html)

Cow tipper 01-13-2013 10:55 AM

top speed
 
its very annoying to be cruisin down the highway basically floored at 75mph. So I was wondering what I could do to get my top speed up so I could actually be able to driveon the highway. I have the 3 speed automatic transmission.

1993cummins 01-13-2013 11:02 AM


Originally Posted by Cow tipper (Post 979354)
its very annoying to be cruisin down the highway basically floored at 75mph. So I was wondering what I could do to get my top speed up so I could actually be able to driveon the highway. I have the 3 speed automatic transmission.

not really sure why you would max out at 75 mph , i can get up to 75 going up a slight hill on the highway and my truck is almost all stock , maybe there is something wrong there but im not sure

Bigg Redd 01-13-2013 11:05 AM

Well, a couple of questions. WHat is your gear ratio? 2wd or 4wd? Any Intake mods? Exhaust mods? Your 3 speed auto can only do so much. What kind of RPMs are you hitting at 75 mph? What is your tire size? ........:humm:Brain fart.......

Cow tipper 01-13-2013 11:16 AM

pretty sure gear ratio is 3:08 its 4x4. Has a K&N intake filter, the exhaust is straight back but is still stock, and im hitting around 2500 rpm at that time. I can hit 90 if im really trying to torture my truck.

---AutoMerged DoublePost---

tires are 31 inch

blackduck 01-13-2013 11:25 AM

While not knowing the rolling radius of those tyres, 3:08 gears with direct drive will give you somewhere close to those speeds at 2500 rpm

Cow tipper 01-13-2013 11:30 AM

so what are you suggesting I do?

blackduck 01-13-2013 11:32 AM

Overdrive gears are about the only way you will get the engine rpm down.
Your maxxed out on final drive ratio.
Being a 4X it may take some doing, different transmission with over drive is required.
Sorry for the good news

Cow tipper 01-13-2013 11:33 AM

thanks man

Bigg Redd 01-13-2013 11:34 AM

x2. If ya wanna bring down the RPMs and increase speed, Look into an overdrive unit and split the gears. You will essentially end up with a 6 speed trans. Lower RPMs at 75 will also net you much better MPGs. Even better if you slow it down some. The good Lord gave us multi-lane highways and streets so others can pass if they think youre too slow.........:w2:

blackduck 01-13-2013 11:41 AM

If you have enough driveline length you maybe able to squeeze an overdrive unit behind the trans but being 4x4 you will only be able to use it in high range 2 WD drive.
Sounds more like an overdrive setup out of a later model would be the easiest.


All times are GMT -5. The time now is 04:22 PM.


© 2024 MH Sub I, LLC dba Internet Brands