1145 replies to this topic

[CHILL Gone DUTCH]

The 3" is longer so you will have to mod the down pipe also

[leevx2.2]

Come on G why would you fit a restrictive manifold on a 3" system

I think you'll find you fitted it lee Well, either you or MBR

I fitted I didn't buy it

[CHILL Gone DUTCH]

Graeme = RED
Bill = BLUE

Below is Graemes graph from 2 pages ago for reference:

Is bills graph at the wheels and Graham's at the crank ??

[Graeme Lambert]

Come on G why would you fit a restrictive manifold on a 3" system

I think you'll find you fitted it lee Well, either you or MBR

I fitted I didn't buy it

I know... Just trying to dodge the stupidity slur

[Graeme Lambert]

you need a better exhaust manifold 

If that's all it is Neil, then annoying though it is (someone could've told me months ago lol) then at least it's an easy if expensive solution. So, anyone want a tullet 2.5inch mani? Perfect for a stg2 or stg3 m62!

Ha ha, project once is dead, long live project once and a bit

Actual lolz Suppose it had to happen eventually. Actually slightly surprised it took this long...

[fezzasus]

Not convinced it's the manifold personally, why would the power drop off? Surely if the manifold reached its maximum flow rate then the power would level out

[Graeme Lambert]

Not convinced it's the manifold personally, why would the power drop off? Surely if the manifold reached its maximum flow rate then the power would level out

 

Well that certainly sounds logical. But then I don't really understand these things...

[CHILL Gone DUTCH]

or the manifld could of reached its limit then the build up in heat with further revs causes more power loss

[Graeme Lambert]

or the manifld could of reached its limit then the build up in heat with further revs causes more power loss

 

Would you expect such a sudden drop off for that though?

[fezzasus]

or the manifld could of reached its limit then the build up in heat with further revs causes more power loss

 

Why would heat buildup in the manifold cause powerloss?

 

Heat build up (within material limits) is a good thing, it's why people wrap or ceramic coat exhaust systems. Hot exhausts keep the gasses hotter so they flow faster and reduce back pressure.

[CHILL Gone DUTCH]

Depends on how it's setup I no as soon as my inlet temps reach around 72-74 degrees my car seen to drop power like a stone Not just because of the heat but also because of the ecu retardation because of the heat = loss of power The restriction increases the heat dramatically Because your engine is 2.0 you will probably have more compression the the 2.2 so this also increases heat . With same pulleys etc etc Shame you can't do a power run on a cold dry night Makes a massive difference to my car But I am still wondering about my dip in power compared with yours Around similar revs, could it be coincidence

Edited by CHILL Gone DUTCH, 09 July 2015 - 09:27 AM.

[Mopeytitan]

I always thought the hotter the exhaust gases are the better but you will get power loss of your inlet charge is hot due to the less dense air entering the cylinder.

[Acidpopstar]

Is it now that I mention water injection?

[Graeme Lambert]

Is it now that I mention water injection?

No. Not until we determine I have a heat problem

[CHILL Gone DUTCH]

Is it now that I mention water injection?

No. Not until we determine I have a heat problem

T map ??

[fezzasus]

My first port of call would be belt slip, tyre traction and boost loss. Talking to the people who ran the RR might give you a better idea too.

 

 

Depends on how it's setup I no as soon as my inlet temps reach around 72-74 degrees my car seen to drop power like a stone Not just because of the heat but also because of the ecu retardation because of the heat = loss of power The restriction increases the heat dramatically Because your engine is 2.0 you will probably have more compression the the 2.2 so this also increases heat . With same pulleys etc etc Shame you can't do a power run on a cold dry night Makes a massive difference to my car But I am still wondering about my dip in power compared with yours Around similar revs, could it be coincidence

 

I assumed you were talking about the exhaust manifold, obviously an inlet manifold would have this problem, but as both yourself and others have reached higher power it's very unlikely that any manufacturing variance is causing Graeme's to flow much less.

[Claws]

It'll be fine.

[CHILL Gone DUTCH]

the 2.0 is not able to swallow as much air As the 2.2 So there is more pressure in the inlet manifold with same pulley = more heat On top of that if the manifold is restricting flow the car can't get rid of the combusted fumes which then also causes more compression All this causes heat which dependant on when the ecu is retarding ignition All this then snowballs into heat restriction and power reduced dramatically Plus the car could be injecting more fuel which again throws afr out which reduces power but probably does help cool things So it depends on how ecu is setup This is why I chose to run a bigger pulley to reduce boost/heat etc Which has not made my car any less powerful than the smaller pulleyed cars

[CHILL Gone DUTCH]

I think the proof will be when artic monkey gets his going As 2.0 with a 3" complete system I will try and convince him to run the same size pulley

[Graeme Lambert]

I think the proof will be when artic monkey gets his going As 2.0 with a 3" complete system I will try and convince him to run the same size pulley

But we already have 2-litres with harrops in Europe don't we?