Crawford BRZ Turbo Kit Enjoying E85

[MSTiFK8R]

still cant understand why take VF37 instead of ~same turbo, but ball-bearing (VF36 from Spec C)

you'd spool 300-350 rpm faster

[Jeff86]

Nice curves

[chulooz]

Originally Posted by Draco-REX

Strange curve for a turbo. Lots of mid-range, but a big drop off at the top end, torque-wise.

Familiar with any turbo EJ motors?


Looks like a blast, crawford always steps up.

[Draco-REX]

Originally Posted by chulooz

Familiar with any turbo EJ motors?


Looks like a blast, crawford always steps up.

Very. THe stock ones drop off like that because they have a lot of compromises t work around. You usually don't see a curve that like on an aftermarket kit. Additionally, on most tracks the engine tends to stay in the upper rev band, especially since our cars are geared to stay above 5K when shifting near red line. So having the torque drop off there is an odd choice.

THe only thing I can think of is that it is tuned for corner exit, hence my comment about tight tracks (maybe AutoX?) and big rear tires.

[Coheed]

That's a nice curve. But it makes me nervous of the compromises made to put that down to the ground. Big tires, stiff clutch... Could be a great street car... but I doubt it. This is a track monster.

[koyv90]

Worried as well because it looks like it would not be street able.

[jeebus]

I like that power curve. From 5k to 8k it would be very predictable on track...and that's where you'd be in the power band all day long.

[Acree]

Originally Posted by Draco-REX

Strange curve for a turbo. Lots of mid-range, but a big drop off at the top end, torque-wise. Almost looks like a supercharger plot. Good for a smaller, tighter course. Going to need big tires out back to make the most of the corner exits.

Sorry but this statement shows how much you don't know about turbos. This is a very common curve when the turbo has been properly sized and is being utilized well into it's efficiency range.

Ask me how I know...

-Acree

[Draco-REX]

Originally Posted by Acree

Sorry but this statement shows how much you don't know about turbos. This is a very common curve when the turbo has been properly sized and is being utilized well into it's efficiency range.

Ask me how I know...

-Acree

If you say so. I just know that most aftermarket turbo kits and modified stock setups put the lump of power at the top end. I don't know which is more efficient, and don't profess to know. I didn't say it was wrong, just different from what is usually seen post-production.

What I do know is that judging on that dyno graph, the majority of the punch is in the midrange. That tells me it's set up for corner exit, not say, drag racing or power-tracks with long straights.

[Acree]

For comparison, here is my E85 dyno from my personal Evo IX. This turbo is pretty much maxed out on my setup, but it gives me a great power curve and decent spool up. This is on a mustang dyno, which would be approximately 630whp on a Dynojet.

Blue is Torque, Red is HP

-Acree

[xwd]

It's the curve from a turbo which is maxed out. A VF37 is not a large turbo at all so it looks like your typical STI power curve.

The power they are making out of it though is pretty awesome, they had another plot with it compared to a STI with a GT30R and it was making about the same amount of HP and more TQ.

I guess my only concern is the turbo is so small the onset of boost/TQ may make the car a bit hard to handle. It would be like an on/off switch. It's a ton of fun in an AWD car but RWD will take a little finesse.

[Tiz]

Any news? I would like to order ... ^^

[xwd]

Call Crawford.

[King Tut]

Originally Posted by Tiz

Any news? I would like to order ... ^^

Have money ready for a rebuild as well.