Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
Hey guys,
Im getting myself a new diff and tailshaft for my car, since the old tailshaft broke and i have found out it was suited for the 302 not the 351.
anyways im getting a 9inch LSD with disc brakes, i have a question bout what ratio i should get.
i have a chunky cam, im not sure if that affects what im after but anyways. what i am after is not a superfast car. i would be happy if my top speed was 150-160kmh aslong as i can get there super fast. eg i will be at 150 before the tool in the vn commo next to me gets to 100. wow im proud that was a good example lol.
so yeah im not sure what ratio i need, i can never remember if the higher the ration means quicker takeoff or higher top speed. could someone help spread some light on this situation...!
Cheers Your Local XB Owner
|
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
With diffs, a high ratio is a low number as it gives a higher speed per revolution of the motor and a low ratio is a high number as it gives a lower speed per revolution of the motor. For example: With a 3:1 diff, the motor turns over 3 times for each Edited by user Saturday, 24 February 2007 5:45:32 AM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Member
Groups: Registered
Joined: 23/02/2007(UTC)
Posts: 38
|
My 'ol 250 (with a fair bit of work) runs a C4, 3000 stall and 3.7ratio borg warner lsd.
Your stall speed will have more effect on how the car operates with the cam (assuming you run an auto) than actual final drive ratio. Think about it... if your cam m |
<<<just me>>> |
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
Thanks guys, would a 3.70 or a 3.89 ratio be a good choice then??
|
|
|
|
|
|
Rank: Member
Groups: Registered
Joined: 23/02/2007(UTC)
Posts: 38
|
It'll fly...
Rev the engine to, say, 3500.
Hold it there a minute or two.
Think you can put up with that? Then go for the gears you mentioned...
<<<just me>>> |
<<<just me>>> |
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
Shweet well before the tailshaft broke, it was revving at 3350rpm @ 100kph and i like my cars loud, only got single exhaust atm wanna get duel system soon... gotta get car running first :-)
***Your Local XB Owner***
|
|
|
|
|
|
Rank: Member
Groups: Registered
Joined: 1/03/2005(UTC)
Posts: 292
|
I agree 3.5's the go. If your engine is stock? It'll run ou of rpm at your desired speed. XB Fairmont sedan : [email protected] |
|
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
The Engine aint fully stock well I know its got a chunky cam thats about all i know that it has, oh that and its gas research.
|
|
|
|
|
|
Rank: Member
Groups: Registered
Joined: 23/02/2007(UTC)
Posts: 38
|
Go gas research!
My XF is faster than my EL ever was, and is still cheaper to run... Guessing your car would be making a touch more power than mine, however...
Have you lined up someone to tune it properly? Gas research set ups tend to respond better t |
<<<just me>>> |
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
Yeah it helps my dizzy had no advance when i got the car but then changing to elec dizzy i now have the advance but when i get the diff and stuff done im takin the car down the road to the mechanic that specialises both in gas research and dyno tuning =))
|
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
4.11 gears are good for speed and 2.7's or 2.9's are great for cruising but still got the guts when you put the pedal to the metal
|
|
|
|
|
|
Rank: Member
Groups: Registered
Joined: 1/03/2005(UTC)
Posts: 292
|
Is the cam a hydraulic or solid flat tappet? A hyd cam generally doesn't go from more than about 6000rpm which with a 3.5's good for around 200ishkph. 2.7's or 2.92's aren't any good for decent cammed engines. They just cause the motor to labour and deton |
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
