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[chuftsmv6]

hi i was thinking of raising comp on my omega 3.0 v6 to get abit more power is this possible  plus my head gasket has blown so i would be able do it when i changed the gasket is this possible. any info would be a big help thanks 

[tunnie]

"raising comp" raising the computer? Don't see how the height of it will affect performance!

You can have the engine chipped, it will product slightly more power, but very little to be honest.

[Martin_1962]

Problem is skimming heads will mess up fitting the divider and front cover.

I reckon though there is enough leeway to skim off about 10 thou, ie about 0.5mm before any problems are encountered.

Other option is 2.5 heads but that will probably be too much.

Try DBW exhaust manifolds

[Andy H]

"comp" = abbrev of "compression ratio"

Not sure about the 3.0l V6 but the 2.5l V6 I used to have seemed about on the limit for standard unleaded. I did try running on super unleaded a few times but couldn't detect any difference in performance. On that totally unscientific basis I suspect that you could theoretically get more performance out of super unleaded with a higher compression ratio.

Actually achieving an increase in compression ratio could a right pain. The heads are not meant to be skimmed, I don't know if the block height could be reduced :-/ but then valve clearance could be an issue. If you have all adjustable cam belt tensioners you should be able to get the cam timing right though.......

A more straightforward gain would be to fit 3.2 exhaust manifolds 
[edit]must type faster..........[/edit]

[chuftsmv6]

hi its running at 227 bhp with exhaust air filter and chip of an ex police mv6 plus manual gbox i dont know much about skimming the heads and clearences i wondered if it would make much difference to the power gain thanks for the quick reply

[tunnie]

sorry i'm in IT thought comp was computer 

3.2 manifolds breath better than 3.0, but for the record, ex-police Omegas ran standard ECU setups, they were no different!

I'd be interested to know how you got 227 figure!

Only noticeable mod, would be a police spec diff, which was a lower ratio to aid the 0-60 dash, but at the expense of top end speed.

I've driven a 3.2 plod with such a diff, it was quick off the mark!

[serek]

sorry i'm in IT thought comp was computer 

3.2 manifolds breath better than 3.0, but for the record, ex-police Omegas ran standard ECU setups, they were no different!

I'd be interested to know how you got 227 figure!

Only noticeable mod, would be a police spec diff, which was a lower ratio to aid the 0-60 dash, but at the expense of top end speed.

I've driven a 3.2 plod with such a diff, it was quick off the mark!

I got LSD from police car and still go 155 MPH 

[chuftsmv6]

i went up mikanics in conglton and had it rolling rolling roaded i used the police ecu because i was always told they are chipped i had my normal ecu chipped but it didnt seem to be so alive  when i put my foot down probably just in my head  i  have a spare diff of an ex police estate how can you tell if they are a different spec to my normal mv6 diff

[serek]

i went up mikanics in conglton and had it rolling rolling roaded i used the police ecu because i was always told they are chipped i had my normal ecu chipped but it didnt seem to be so alive  when i put my foot down probably just in my head  i  have a spare diff of an ex police estate how can you tell if they are a different spec to my normal mv6 diff

there no differents to standard diff only some police cars had LSD fitted that all

[chuftsmv6]

thanks is there anyway of telling if its got lsd on that spare police diff i have 

[tunnie]

i went up mikanics in conglton and had it rolling rolling roaded i used the police ecu because i was always told they are chipped i had my normal ecu chipped but it didnt seem to be so alive  when i put my foot down probably just in my head  i  have a spare diff of an ex police estate how can you tell if they are a different spec to my normal mv6 diff

Just to clarify all diffs are the same to retail spec cars!

It is very, very rare for a LSD diff to be fitted to retail spec cars. MV6 diff is no different to an Elite...

Not all plod ones were LSD either.

If the diff is off the car, i don't know how you would test it? I tend to put full right lock on, boot it and see what the rear does 

[chuftsmv6]

haha sound like you have alot of fun in yours thanks for the advice it will be a while before i get mine back on the road my heater matrix blew up with my head being blown. thanks again for the advice

[tunnie]

haha sound like you have alot of fun in yours thanks for the advice it will be a while before i get mine back on the road my heater matrix blew up with my head being blown. thanks again for the advice

Actually it was a road test with the sales man next to me   

[chuftsmv6]

i bet he went as white has a ghost

[serek]

i went up mikanics in conglton and had it rolling rolling roaded i used the police ecu because i was always told they are chipped i had my normal ecu chipped but it didnt seem to be so alive  when i put my foot down probably just in my head  i  have a spare diff of an ex police estate how can you tell if they are a different spec to my normal mv6 diff

Just to clarify all diffs are the same to retail spec cars!

It is very, very rare for a LSD diff to be fitted to retail spec cars. MV6 diff is no different to an Elite...

Not all plod ones were LSD either.

If the diff is off the car, i don't know how you would test it? I tend to put full right lock on, boot it and see what the rear does 

easy to check just need pull driveshaft and you can see differents
Im not very good with paint


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