Crewman Diff Gears - diff gears  

whykickamoocow

Best for (daily, racing, economy)??

Answer to your second question will be determined by the answer of your first.

pipster11

v6 or v8?

depending where peak torque is it can vary engine to engine

is it for economy or performance?

damoyz

its a v8 i'd like a little of both but economy doesn't really matter, i'm only getting 250kms outta a tank anyway lol.

pipster11

dont change diff gears!!! GET A TUNE!!!

$1000 for a tune + high flow panel filter + airbox mod (google monaro airbox mod) and you will get 300rwhp (i think, not kw but still awesome) and it should return atleast 12-14l/100kms city and even down to 8 on the highway (these are all off the top of my head btw, did some research for a friend a while ago)

also, auto or manual?

and what kind of a load do you carry daily?

damoyz

its already making between 260-270rwkw. has a 232-234 cam cold air etc see damoyz's crewman ss in members rides!! don't carry a load really at all. 6sp man

damoyz

is there an all round 1? i get 250 max outta a tank. see damoyz's holden in members rides. i can't say no to a race lol 1 point left!!

pipster11

if you get a propper tune it should be easy to get atleast 400 to a tank
but how hard do u drive it

with diff gears its really only one or the other
high ratio = faster accel but higher engine speed on the highway
low ratio = slower accel but lower engine speed

but if its anything like my mates vy ss you can only really get into 6th at 110kmh

did u get it tuned when the cam went in or just a power run?
could be a case of a tuner just tuning for power and not partial throttle maps

a user on here had a twin turbo ss ute (not crewman tho) auto that would get 12l/100kms easily
and maybe even 700kms on the highway
its all in the tune

damoyz

ok, i spoke to kent at hitorque and he said it would need a tune after the exhaust went in but maybe they only did a power run? i've also been told there is a overlap in the manifolds because of the cam and would maybe need headwork to suit? i'm def no expert, i bought the ute as is. i do know that the diff is different in the crewman to a two door. ps thanx for your help.

pipster11

no worries mate
someone will post in the morning with more info hopefully

zorak

Crewmans are a heavy rig mate BUT in saying that you should be getting a bit more than that to a tank...

Anyway to your question regarding diff gears you are best off to go straight to a 4.11, theres been a couple of these around that return good economy and also will liven the land yachts up. I run a bigger cam than you and retain std heads, I do however have a pair of tricked LS2 heads sitting in my garage waiting to go on. Heads will give you around 400rwhp (this varies from motor to motor). I also am comfortable to get 450klms to a tank, mines an M6 also.

Also you didnt say if it was an LS1 or an L76 (5.7 or 6.0L). After exhaust all it will need is a touch up on the tune, it wont be much gain to be honest.

Also if you want to give it a run with the mods you have I would expect it to get into the 12s with a decent pair of tyres.

damoyz

its an ls1. i have been told 411's are the go but i'm worried about highway revs, but i guess my fuel consumption can only get better! what headwork do you think i should get? kent at hitorque told me i'd make 10-20rwkw because the old exhaust on it was so untidy. that is where i got that figure. i'm sorry i don't know what an m6 is, i'm not much of a mechanic.

zorak

you've got to ask yourself how much highway driving do you do? I sit on around 2000rpms @ 110kph and still retain good economy but are hardly ever on highways when I do drive the ute. Economy too is in the tune, without diagrams or screen dumps that would confuse you it is possible to get better economy with alterations to the tune. Problem with a lot of shops is they tune to peak power as thats what is the general expectation of the customer.

A4 (4spd auto) M6 (6spd manual)

The head I have got are massaged LS2 heads. These run larger valves and Ive had some 'other' things done to them which are a bit on the hush side. If it were me Id go for a set of Higgins heads. The do them exchange or you could go a set of Darts but you are looking at 3k plus for a pair of them!
If you on a budget with exhaust you can pick up HSV VY2 HSV headers for around $120 (these are actually pretty good) and a decent twin 2.5" catback second hand for a good pricce will do.

pipster11

m6 is manual 6 speed, just slang
how much highway do you do?

damoyz

not that much, that being said i don't wanna go for a long drive and have to fuel up every 400kms. i think i'll get the 411's i'm sick of little cars being quicker off the line..... even if its only for 10mtrs!! next question.... the radiator keeps dumping coolant, its the second radiator i've put in, nothin special just a standard 1. the first 1 had a crack in it and looks like the second 1 is the same. it can't be the head gasket or i wouldn't have been able to smoke that r33 the other night so i'm puzzled. PLEASE HELP!!

pipster11

dumping coolant out of the overflow bottle thingo or the actual core itself
if its the core itself get a nice pwr alloy one
if its teh overflow bottle then get the system pressure tested or try a different rad cap

even with a blown h/g you still have nearly full power depending on where the h/g is leaking from (i.e. oil to coolant or visa versa) but to blow the water out it would have to be combustion chamber to water so you would notice bubbles coming up

zorak

the std rads are good for big HP in the LSx's, PWR ones are an expensive non requirement. where is the coolant dropping from that is the question? the rad taks do get hairline fractures in them also the heater taps on commodores can fail easily.

as for diff gears 4.11s like I said will give you 12s on the strip and with 270rwkw easily make most buzzboxes/lineskies etc look silly.

zorak

thought Id add to, is yours a VY or VZ??? The VY uses the older rad with the external reservoir the VZ uses the rad with no reservoir

pipster11

if he keeps braking stock ones he may as well go for a nice shiny one
its a crewman so it could be up for some hard work towing etc
its deff over kill but gives piece of mind really

damoyz

its a vy, me and my mechanic mate had a look and ii looks to be comind out of the drivers side tank on the side of the radiator. is this common? i'm fucken over it!!

damoyz

peace of mind is what i want. how much are these radiators you speak of?

pipster11

pm the ppl selling them in the sponsors section on here
your looking at about $900+ from the sponsor tho but they are pretty much the best you can get + its aussie made and owned
but you'd be looking at about $1500 retail so its a pretty good deal

zorak

Theres 800hp cars running std radiators the PWR style ones have shown no gain. My VU had a hairline in the right tank, I welded it up at work (plastic weld to keep things clear).

Stick with OEM gear mate, you can pick one up for less than $200.