which motor

[Nyemetz1]

What motor would be the best to turbo in terms of reliability and power/torque. All stock with low comp head gasket.

b18b with vtec head (b16a)
Normal b18b
b16a

cheers in advance

[Macros]

normal b18b

american's seem to get good power on stock internals

[nva2nd]

b18b

[LUDIKRIS]

b18b / b16 head

[Nyemetz1]

if i were to use the b16a/b18b hybrid what kind of boost could i run reliably?

[DC2r]

Its all dependent on the tuning, and weather you wana run standard or aftermarket forged items, you should be able to reliably run up to 10psi on a standard motor, depending on the age and condition of engine, and of course the tuner.

[Nyemetz1]

10 pound on a b16a rebuilt though ?

[LUDIKRIS]

Originally Posted by Nyemetz1

10 pound on a b16a rebuilt though ?

Yes if the turbo isnt too big.

If your running a big turbo then run less boost.

Small turbo you can run more boost.

Get a good tune, and do heaps of research on HT.

[tarmac-]

you could run 10psi on a stock b16a thats never been rebuilt. llew got up to 340whp i belive - thats on a stock b16a with type r cams i think...

it all comes down the tune really providing the engines in decent nick.

[Dezigns]

Originally Posted by LUDIKRIS

If your running a big turbo then run less boost.

Small turbo you can run more boost.

Huh? Boost is boost no matter what turbo it comes from!
A larger turbo will provide you with a cooler flow for the same amount of boost too

[LUDIKRIS]

Originally Posted by Dezigns

Huh? Boost is boost no matter what turbo it comes from!
A larger turbo will provide you with a cooler flow for the same amount of boost too

Yes 1 psi = 1 psi

But...
What im saying is a bigger turbo will give you more air flow at a given psi than a smaller turbo.

Thus for instance on the exact same motor-
T3/4 @ 10psi may see about 320whp
T28 @ 10psi may only see about 280whp

[Dezigns]

Originally Posted by LUDIKRIS

What im saying is a bigger turbo will give you more air flow at a given psi than a smaller turbo.

Thus for instance on the exact same motor-
T3/4 @ 10psi may see about 320whp
T28 @ 10psi may only see about 280whp

PSI is the measurement of airflow though... if there was more air, there would be more pressure...

Its just the larger turbo is more efficient at delivering the boost (not spinning its nuts off) and therefore more power

[unstable]

B18b!!! when i finally get my new manifold ill take you for a fang.

[Nyemetz1]

B18b!!! when i finally get my new manifold ill take you for a fang

I think it would be wrong to remove vtec from an eg9, I cant believe that you dont have the manifold yet, thats bullshit. I look foward to the ride.

[Locust2000]

Originally Posted by Dezigns

PSI is the measurement of airflow though... if there was more air, there would be more pressure...

Its just the larger turbo is more efficient at delivering the boost (not spinning its nuts off) and therefore more power

No, PSI is not the measure of airflow. CFM is a measure of airflow. If the air were static or in a confined space where it were trapped, PSI would let you work out the volume of air. However, you're talking about an intake tract, which isn't sealed(turbo at 1 end, combustion chamber other). You can only compare 'PSI' ratings if you're running the same/very similar turbo/intake setups.

[Dezigns]

Originally Posted by Locust2000

No, PSI is not the measure of airflow. CFM is a measure of airflow. If the air were static or in a confined space where it were trapped, PSI would let you work out the volume of air. However, you're talking about an intake tract, which isn't sealed(turbo at 1 end, combustion chamber other). You can only compare 'PSI' ratings if you're running the same/very similar turbo/intake setups.

In the case of an engine, the constant is your cylinders as they are still only consuming 10psi per cycle, so still the same volume of air...

10psi on a 1.6L engine @ 4000rpm is still 0.085m³/sec whether its being delivered by a T3 or monster TO4Z

[americ_ian]

noobs

http://www.honda-tech.com/zerothread?id=1055905

[turbozxi]

Originally Posted by Dezigns

In the case of an engine, the constant is your cylinders as they are still only consuming 10psi per cycle, so still the same volume of air...

10psi on a 1.6L engine @ 4000rpm is still 0.085m³/sec whether its being delivered by a T3 or monster TO4Z

Regardless, what Ludikrus said originally is correct you will make more power with cooler air, and it is power that kills engines not PSI. You know this I am sure.

[Grin-T]

I think LUDIKRIS is correct as well.

There was a thread on H-T about a guy in Denmark running 23psi on a pea shooter size turbo on his ITR. It made the same power as a 'normal' size t3 / t4 boosting 7 psi...

Judging by that case and others, I highly doubt psi is the same measure between different sized turbos. Bigger turbos are more efficient, thus delivering cooler denser air.

Run 15 psi on a T88 on a worked RB26DETT and run 15 psi on a t25 on the same engine and see if they make the same power figures. :wink:

[Horny_Devil]

pressure and flow are different, its all to do with fluid dynamics.

flow is the amount of air passing a point at a given time peorid, in our case a minute (CFM). 10psi at 100CFM is going to be more air than 1psi at 100CFM (kinda abvious). but 10psi at 120CFM is more air than at 100CFM.

this gives a faster fill rate on the cylinders and due to the velosity(a component of the flow rate) of the air you can get more air(and fuel) into your engine. meaning more power.