ir_fuel

Wheel cleaning: Virosol

So how do EVO's have 2.0l engines and still produce 340+ BHP

As i said (you should read everything ) Turbos are "cheating".

Basically they pump more air in the cylinder, hence you can get more fuel inthere too to get a good mixture, so the generated explosion is bigger.

One thing i didnt touch is big bore vs small bore engines, meaning the typical american muscle car vs european race-cars. The way you construct your cylinders (big diameter, small height, or vice versa) also influences all this

 

Ok. So how does the size of the engine (3.5l or 2.0l etc) affect the ability to produce bhp and torque?

Thats easy,

bigger engine size + more cylinders -> more torque.

But do not compare N/A engines and FI ones here, because adding a turbo is "cheating"

Lets try simplifying it:

More engine size means bigger cylinders means more fuel in the cylinders in total, means bigger explosion = more force generated by the fuel exploding. Now there are some other issues influencing the final result:

If, for the same engine size, lets say 4 liters, you have very few cylinders it would mean each cylinder is very big, so the pistons and all the connected parts are very big/heavy too. This means that lot of the force of the fuel explosion will be used to get all this mass moving = loss of efficiency. Now if you have 4 liters and lots of cylinders (8 for instance) each cylinder will be smaller so there is less energy wasted getting everything to move. Now you cannot continue doing that infinitly, coz when you would lets say make a 4 liter 20 cylinder car you are also loosing efficiency because of all the added components, the weight of having lots of them and the fact that there is getting a lot more friction and so on. So engine manufacturers have to find a balance between all this. lots of small cylinders = quicker revving coz less mass to move, too many small cylinders == you get too much "stuff" in the engine to move and the engine gets too heavy with too many moving components. Few big cylinders == very hard to make lots of revs because of the mass of the pistons, hard to accellerate the engine because of that mass etc etc.

Is that clear?

Today ....

is pick-up-the-Z day

gun metal

rays

navi

ipod adapter

parking assistance

alarm

michelin pilot sports

tonneau cover

carpets

BRING ME THE GOODIES

New to this all, but copuld it be that turbos help with torque more than bhp?

Easy, coz most turbos influence your torque curve in the lower and middle range of the rpm range of your car, but wont influence it at the top end, or at least not that much as in the middle. So the TOP rpm hp will not change that much, but if you were to look at the hp/torque somewhere in the middle of the rev range the difference will be much bigger.

The way the engine works doesnt matter, the calculation from torque to hp ALWAYS is the same, even if you were to put a guy on a bicycle on a dyno

Another way to put it,

 

below 5252 rpm torque will always be more than power *at that engine speed*

above 5252 rpm power will always be more than torque *at that engine speed*

 

but *peak torque* can easily be above *peak power* as your astra 1.9D shows but these peaks occur at different speeds

 

Gotcha!

 

So how can a car with a 5 bhp power difference have a 110 lb ft difference in torque???

Coz the way the curves are? Look at the rpms associated!

The petrol one has max hp at 5600 rpm

the diesel one at 3500 rpm

New Tyres Please

 

Brilliant

I guess thats the most useful thing one can do with the factory-fitted bridgestones

loading stuff that doesn't go below it hence passing it over the strut brace...

 

Anything that won't go under my strut brace, does not go in my zed!!

Amen to that

loading stuff that doesn't go below it hence passing it over the strut brace...

Any takers????

 

take what?

 

see pp

??

Power being the ability to maintain a top speed, torque being the ability to get there.

Eh no?

Equation goes out of the window when FI comes into it IIRC.....??

Eh no? What does FI change to this matter?

Want one too.

PM me, and tell me how much it costs to get it to Belgium

The vents look nice, but i prefer the standard strut-brace look dough

BTW, how do you manage to scratch a rear strut brace?

As said - if you are moving the wheels out of the factory specs offset then there are risks in the same way putting straight wheels on with the wrong offset.

 

Don't confuse the effects of bad offset with spacers

Well i havent got the slightest clue how it will influence this on my car. I just have the 18" rays alloys and some spacers to fill the arches a bit more (dealer chose the spacer sizes, i have no idea how big they are, but i told him clearly the wheels should stay IN the arches ). I presume the Z is quite "flexible" in this, just by seeing the different tyre sizes nissan/nismo fit on these cars (e.g. on the rear side anything from 245's in 18 to 275's in 19). No idea about the offsets dough

Ahhhhh.

 

Starting to make a little sense now

 

Where does the 5252 come from?

http://auto.howstuffworks.com/question622.htm

and

http://auto.howstuffworks.com/horsepower.htm

Have fun

Any takers????

take what?

I definitely wouldn't spend extra money to get the Rays. If you can get them for a low price, not replacing the standards ones, it might be worth it. Use one of the sets for winter.

Too late

I got them

Well at least now i can say the car is full-option (except for that UGLY orange interiour which i didnt take, nothing personal dough )

I know (and respect) Val's view on using spacers on aftermarket rims but does anyone else have any views/experiences to share?

I ve got a set of them too to fill the arches a bit more. We 'll see what happens

Hopefully it doesnt mess up the tracking. Installing it on the car from new, so no idea if this needs to be checked and if it will / can be checked by the dealer?

The dealer proposed to mount it on the inside of the center console (where the bluetooth thing is) on the inside of lid, so you can access it when opening the lid, and when it is closed you dont see it at all.

Got a satnav car so there its not an option

for you weird-unit-using ppl:

Torque in lb-ft = HP * 5252 / RPM

So a car producing 200 HP at 6000 rpm gives:

200 * 5252 / 6000 = 175 lb-ft of torque at 6000 rpm

Horse power at a certain RPM = Torque at that RPM times the RPM (and then scaled by some constant, not gonna explain how to calculate that )

horsepower is the amount of work done by the engine, torque shows the force that the engine delivers on a lever. 1Nm = 1 Newton of force given on a lever at a distance of 1 meter. (This is because engines tend to make things turn, hence the fact they use torque and not simply force ).

So basically: the more torque, the harder it will pull on your wheels, for the same car ofcourse (gearboxes and other stuff can influence the final amount of torque on the wheels ).

As you can see, one is related to the other (from one you can calculate the other and vice versa). Now one can say more torque is always better, and it is, unless you can start playing with the rev limiter. For instance it might be better to have 40Nm less torque, but because the rev limiter has been upped 2000 rpm more horsepower (if the torque were to stay constant), coz one can stay longer in the same gear (the Honda V-Tec principle lets say ) , than to have 100Nm more, but 1500 rpm less (your average diesel engine).

Now ofcourse if the both of you are driving at 2500 rpm and floor it, the one with more torque will be quicker intially, but when you keep going the one with much more rpm before the limiter will be able to go faster in the end because the guy with lots o torque but no revs already has to change a gear while the other dude stays in the same gear. (As you might have noticed, changing gear up reduces the "pulling-power" at the wheels ).

This all under the assumption that the high-rpm low-torque car does not decrease its torque when getting to the rev limit.

Hope this makes sense?

If you have any more questions, just shoot, i ll try explaning

Hi guys, i just got a call from my dealer concerning the iPod install.

This is what he said:

We didn't install it so far but it's possible for the 350Z. I've to know which I-Pod you have (nano, mini, Video 30GB, Video 60GB, 1st Generation) for a holder. It's a holder for the I-Pod but you need another holder/clip to install in the car to pick up this I-Pod-Holder. The problem is that there doesn't exist one for the 350Z but i'll talk to Nissan about this problem and i'll call you later.

Any idea what these 2 holders are?

And another question, where can one put an ipod holder out of sight in the car? I am really not a fan of screwing things to the dash, so if you have a bluetooth install for the phone, is there enough room in the center storage thingy to put an ipod + holder?

hope you 2 Belgians will join us in the European 350Z meet that I'm trying to organise!

And when and where will that be?

If its not in Prague somewhere in the middle of the winter you can count me in

Hopefully i ll have my car end this week