Power Fc Vs Nistune

[B-rice]

Lol so it "kicks out" at 4500rpm?

i dont get whats so "lol", you do realise that its a street turbo usually you dont go over 5000rpm, i can deal with the 500rpm unlike having a lot of lag.

[Rolls]

We can produce both powers at the same rev by adjusting the throttle plate.

Timing would be correct for the application at both loads.

If the AFR is the same fuel usage will be double.

However, I do believe I was caught up in the moment and using the word "exactly" may not bet totally correct.

There are many factors that come in to play like the difference in barometric pressure, air and fuel temp from the 2 events being 100hp and 200hp.

If measurable there would have to be some sort of variation.

The real concern is why your turbo is kicking out? I would be upset if my 3037 was doing that

More revs means more inefficiencies due to friction in all the moving parts, different revs mean different intake speeds due to the cam (which is why torque changes and isn't always the same) on boost, off boost changes things as well. The same power at the same AFR can be COMPLETELY different.

[Hadouken]

i dont get whats so "lol", you do realise that its a street turbo usually you dont go over 5000rpm, i can deal with the 500rpm unlike having a lot of lag.

Lol, so you hve no boost after 5000rpm?

[D_Stirls]

More revs means more inefficiencies due to friction in all the moving parts, different revs mean different intake speeds due to the cam (which is why torque changes and isn't always the same) on boost, off boost changes things as well. The same power at the same AFR can be COMPLETELY different.

Torque changes through the rev range due to changing Volumetric Efficiency.

[Rolls]

Torque changes through the rev range due to changing Volumetric Efficiency.

Yes which is directly related to cam profile and boost pressure.

[R31Nismoid]

i dont get whats so "lol", you do realise that its a street turbo usually you dont go over 5000rpm, i can deal with the 500rpm unlike having a lot of lag.

A street turbo that comes on @ 4500rpm - when you don't go over 5000rpm?

500rpm band... awesome.

[D_Stirls]

Yes which is directly related to cam profile and boost pressure.

Sorry I thought you were saying that the torque varies with revs purely due to friction. lol

[Birds]

Let's not forget more RPM when connected to a gear = more vehicle speed = more resistance = greater load on the engine to maintain that speed...will change with inclines and declines of road surface too. Way too many variables!

[GTSBoy]

i dont get whats so "lol", you do realise that its a street turbo usually you dont go over 5000rpm, i can deal with the 500rpm unlike having a lot of lag.

Lol. On drugs much? Who says you don't usually go over 5k in a street turbo car. Especially wierd when we're talking about RB engines where you can scream to well over 5k in less than a second in 1st and 2nd....and usually do so.

[HYPED6]

More revs means more inefficiencies due to friction in all the moving parts, different revs mean different intake speeds due to the cam (which is why torque changes and isn't always the same) on boost, off boost changes things as well. The same power at the same AFR can be COMPLETELY different.

I do believe i said the same revs for different power.

You should actually read my post before replying.

[B-rice]

Lol. On drugs much? Who says you don't usually go over 5k in a street turbo car. Especially wierd when we're talking about RB engines where you can scream to well over 5k in less than a second in 1st and 2nd....and usually do so.

im running a GTX3076r soon so i dont really care i never take it on track so below 5000rpm is good enough beside if i tune that badboy properly i can achieve about 480hp which is very decent for a street car. Another mans eat is another mans poison.

[Rolls]

If you don't aim to go over 5k why not get a gt28 or something more appropriate for that rev range?

[B-rice]

If you don't aim to go over 5k why not get a gt28 or something more appropriate for that rev range?

thanks rolls really appreciate. your insightful thinking all the time.

[Rolls]

thanks rolls really appreciate. your insightful thinking all the time.

It was a serious suggestion...

[HYPED6]

The same power at the same AFR can be COMPLETELY different.

What uses completely more fuel.

An Ls1 5.7 NA at 12.5:1 making 370rwhp

Or a CA18 turbo at 12.5:1 making 370rwhp?

Now we are talking massive measurable differences here so the answer should be very clear.

[Rolls]

I have no idea, would come down to many factors... valve train friction, the v8 has more valves, pushrods, but each piston is lighter, the turbo car has higher VE but less cylinders.... Id flip a coin imo.

Probably go the LS1 because of more conservative cam profiles/emissions laws when the motor came out.

Edited March 18, 2012 by Rolls

[HYPED6]

but the LS1 has more volume, and needs less load per liter to create the the same power.

In a perfect world would have a smaller throttle opening but generate the same power.

So you can tell me, on the same engine creating 2 different power out puts that fuel requirements per horsepower are COMPLETELY different

But you cant tell me that with 2 completely different engines, creating the same horsepower your not to sure what one would use more fuel?

[Rolls]

So you can tell me, on the same engine creating 2 different power out puts that fuel requirements per horsepower are COMPLETELY different

But you cant tell me that with 2 completely different engines, creating the same horsepower your not to sure what one would use more fuel?

I'm not sure if this is a serious question? How on earth am I meant to know the different efficiencies of the two engines? It involves hundreds of things! All I said is it would be different...

[Birds]

B-rice it sounds like you would be better off with an N/A - more torque down low and you don't have to worry about pesky boost coming on.

[HYPED6]

More revs means more inefficiencies due to friction in all the moving parts, different revs mean different intake speeds due to the cam (which is why torque changes and isn't always the same) on boost, off boost changes things as well. The same power at the same AFR can be COMPLETELY different.

Its not a serious question, Its a trick question. Its also a demonstration to show that statements like the above shouldn't be posted unless you know exactly what you are talking about.

Both engines use the similar fuel. most would say the same fuel. both do it in COMPLETELY different ways.....

But both use very similar fuel quantities.