hi just came across quite a big turbo .84 twin scroll turbine housing and .60 comp how much lag would i get if i put it on to a 2l zetec. i have no idea what its off or know nothing about it. just wondering thats all

 

lots! its all dependant on engine spec intercooler setup etc its not off a diesel truck is it? useless if it is as they dont like rpm over around 4000rpm and you wouldnt even be making full boost by then!

 

not sure what its off i got it for comp housing but just wondered what it would be like. usual spec big fmic 470cc injectors low comp pistons ect.

 

twin scroll turbo? so you will need a twin scroll manifold also if to use it,sounds slightly to big tbh mate.unless youve got dry sump and 9k rev limit lol

 

your injectors are only good for a real 350ish hp .why not just put a t34 on there? Good cheap turbo for that sort of power

 

The information you've given tells us nothing about the size of it. Also turbo's don't really care what RPM the engine is running at.

 

was about to say that

the turbo isnt linked to engine speed, just how much air its flowing..

 

/\ not entirely true that is it though.
the more an engine revs the more gas comes out of it to spin the turbo.
if the turbo is too big for a small displacement engine then it'll need to rev much higher to get enough gas to get it spooling.

 

Surely it is just the same amount of gas just as a higher velocity due to how hard the engine is reving the displacement doesn't change the more rpm you are doing.

 

Sean is correct, at higher RPM's the volume passing through the turbine housing will be more per given period, this is why big turbo's make boost later.
So by raising the rev limit to say 9000rpm you would have a power band from like 5500rpm to 9000rpm

 

Provided you could get a Zetec 2 liter to rev to 9000 with any sort of power at that level.
Duratec head is so far ahead of any Zetec head, and even those require a fair level of
modification to flow enough air for a 9,000 rpm 2 liter.

 

The 9000rpm figure was just an illustration not a realistic target! lol

 

yeah got a t34 but compressor housing cracked thats the reson i got it cheeper than a new one it was only out of interest.

 

pity the blocks don't lend themselves to big power!

 

Duratec blocks Rick?

 

ian howell built a mad spec one karl and when he had it on the dyno it blew the block to pieces spent an absolute fortune on it aswell

 

They are an alloy blocked engine, which is great for high revving N/A but they don't like the cylinder pressures a turbo engine puts into them. There are some specialist Mazda racing blocks knocking around but you wouldn't waste your money putting them into an RS.

Rick

 

Oh mad!
IIRC Karl Norris told me it was Duratec blocks that he would be using for his CVH builds now re-sleeved with custom rods, pistons, etc..

 

a cvh head wont fit a duratec block plus there chain driven

 

hmmm.. I'm 99% sure thats what he said he was going to use, because of the ever increasing failure rate of CVH blocks
I have no idea as I've never looked at them.

 

https://passionford.com/forum/restor...cs-inside.html

theres some pics and the spec of ian howells on that thread karl if your intrested mate

 

That looks very nice!