crcain

Everyone is so hyped about dyno sheets.

Can we make a record for best looking power band?

I mean this is ridiculous.

http://www.lancerregister.com/showthread.php?t=198818

jmartinez1170

iTrader: (21)

This is on the engine dyno i would assume

crcain

You don't get out much do you?

Yes it's on an engine dyno. And maybe I am just ignorant, but it seems to me the most reliable way to measure power is via an engine dyno. I think one or two people in motorsport are fond of them.

4G63DSM

got time slips for this beast?

HOSTILE_EVO

Holy shizzle! that is a nice power band. i love it!!! What kind of turbo?

zbomb

iTrader: (48)

That may or may not be true, depending on who you ask. I think many on these shores are more concerned with how much power is making it's way to the ground. I understand why those involved in motorsport, who need every last HP need to take as many variables however minute out of the equation. I'm not engine testing and I would want to know the actual power ATW because that's what I'm used to seeing and comparing.

It does'nt seem to me that an engine dyno is the best plact to judge spool. Looks to me like the way they load the motor is different than the way a rolling road does when driving or testing in the proper gear.

crcain

I totally agree that is seems unbelievable it could spool this well. On the thread on the MLR I asked how it would spool on the road. This is how he responded:

Here is the only way I can possibly explain it. First off it is a 2.37... then we don't know the compression ratio of the motor or the cam specs, both of which could help spool a lot. Then this is an amazing turbo kit from Shearer / Norris, with probably the exact right spec turbine housing and what not. So if you think everything is setup just right, I guess it's believable this thing spools when it does?

Done

iTrader: (2)

I was thinking the exact same, could you load the engine up differently from when its actually in the car.

Powerband just looks to good to be true, comparing other similar setups.
Paul Nelsons power graph looks much differently then that one.

Honestly that is better spool then a gt35r!

voidhawk

iTrader: (20)

that's a beautiful torque curve; I don't even care if it doesn't hit full boost until 4k since it makes 200 ftlb at 3k anyway . Sure wish my evo made 700+ ftlb of torque, no matter what dyno it's on ...

crcain

Ok I have no clue about these things but, if I just had to guess, a single scroll GT42 on a 2 litre would probably hit full boost at like 6500 rpm? Well if you assume going to a 2.4 gives you maybe 700 rpm back. Then going to twin-scroll gives you another 700 rpm, then we are down from 6500 to 5100 rpm. Then let's say a wicked cam and the right compression ratio and maybe you could have a GT42 spool around 4500 rpm?

We are already seeing spool #'s from twin scrolls that are unbelievable on 2 litres with the smaller T3 turbos.

zbomb

iTrader: (48)

We'll see, I'm sure that engine is going to be back in a car at some point soon. Maybe the owner can put on a chassis dyno or have someone video the tach on the road. I highly doubt that turbo will spool any sooner that 5000/5500 RPM.

crcain

If we assume a Mustang dyno reads about 20% of engine power.

830 ft/lbs * .80 = 664 ft/lbs atw

1033 hp * .80 = 826 hp atw

SparkTech

iTrader: (141)

Good job....it's nice to see everyone is stepping it up. It benefits the consumer with better parts and workmanship

JohnBradley

iTrader: (30)

I prefer engine dyno readings for a few reasons (and you will see F1, WRC, etc use these as well).

One is it good to see what your actual drivetrain loss is from the flywheel to the ground. I really do not think though that this car is losing 200hp through a gearbox. The frictional losses and heat generated by the absorption of 200hp would cook the transmission. Typically the loss is mostly a constant not a curve as I have observed in domestics that I have dyno'd both on an engine stand and then chassis dyno. The superflow that Herb sells is a very good unit.

To the subject at hand--


WOW, thats is completely awesome.

ETS Michael

iTrader: (91)

An engine dyno typically loads the motor differently than a chassis dyno. With the motors we've had tested on a SuperFlow engine dyno, the powerband is pulled way to the "left" on the graph. The sheet posted is to be expected with that type of SuperFlow engine dyno of a 4202 powered 4G63. If this is like the SuperFlow we've experienced and it looks to be, the revs are brought up and the load matched, then the motor is loaded down and has to spin the dyno back up. This process produces very early big torque but if that is the case isn't comparable to the way a motor is loaded on a chassis dyno like a Dynojet.

Check out this video and listen for them to bring the revs up, then load the motor down before it spins the dyno up slowly which should help explain why the above graph looks like it does - http://www.youtube.com/watch?v=XMe99fNU2wo

Tom