a mate who dont have a computer has just got a 300zx twin turbo

is just running a filter and d kat pipes but is also been fitted with 555s and a fuel pump

what sort of power should he have and what dose he need to make best use of them

On standard tubs he can run a max of 15psi after that they will just be superheating the air, the bigger injectors will supply more than enough fuel with the correct ecu. With oem internals i wouldnt run more thn 14psi for reliability and id think about aftermarket intercoolers.

with all that lot high 300's are possible

whats the best sort chip to run them hes going to keep his tub for the time been as there only 1000miles old and hes getting a front mount in a few weeks

Speak to andyp about chips hes your man.

cool thank

Well with standard turbo's the 555's are a waste of time as the turbo's can't flow enough air to make them necessary.

The standard fuel pump is good for 550bhp+ anyway and very few people ever replace them.

Basically to make ANY use of those mods you need some big turbo's and a custom remap.

On stock internals you'd be crazy to go much past 400bhp anyway.

 

Chris.

Wouldnt the car have been remapped for 555 injectors anyway?

555cc will overfuel with a standard chip.

Wouldnt the car have been remapped for 555 injectors anyway?

 

 

Not necessarily, it WILL have a new chip but could just be a new chip with the old maps and a changed 'k' value to cater for the injectors.... :)

what sort of power should he have and what dose he need to make best use of them

 

I cringe when I see statements like the above ... I'm sure it is a perfectly innocent question (and I don't mean to offend anyone with my response) but there is absolutely no way you can ever state with any degree of certainty how much power a car is putting down based on a short list of "mods". The amount of power a car puts down onto the road is contingent on so many factors - to name a few:

 

- condition of the engine and all it's internal parts

- octane rating of the fuel used

- condition of the tranmission

- %-age power lost through transmission

- Lightened or stock crank pulleys/flywheel/etc

- modifications such as turbo size, intake/exhaust mods, headers, downpipes

- etc, etc.

 

Even brand new cars have varying outputs. Take a look at the new Nissan GTR. Out of the box it should have around 480bhp. However, I know that independent rolling road sessions on two different (but equally specced) cars have resulted in figures closer to 520bhp. And that's on engines which were barely run in.

 

If you're looking at two identically specced Zeds you'll find that they will not make the same kind of power. Too many variables.

 

So, if your mate has bought a Z and wants to know how much power he's putting down then get him to a rolling road - it's the only way to find out for sure. Everything else is just guess work.

 

Sorry to go on a bit but this topic just gets on my wick ... people need to start understanding that "power" is relative to the condition of the car and its modifications. The best way to look at these things is to think in terms of %-age change in power (this is also what insurance companies are interested in - not so much the sum total of new bhp). If you add bigger turbos and have the car remapped properly you can expect a 15% increase in power (these figures are fictional by the way and purely for illustrative purposes). Add a straight-through exhaust, a set of divorced downpipes, larger intercoolers and a free-flowing manifold and that figure might increase to 45%. However if the car (in stock form) was only putting down 224bhp as opposed to another equally stock car putting down 280bhp then you can see how the same modification result in a totally different power output at the end of the day.

 

> ;)

Yes but if you buy a 600bhp chip off eBay you don't need to worry about all that rubbish ;) :rofl:

Yes but if you buy a 600bhp chip off eBay you don't need to worry about all that rubbish ;) :rofl:

 

agreed thread closed :D :mac1:

im upset set now