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      04-12-2013, 10:06 AM   #1
Mike@VAC
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Post VAC 4.4 Stroker Dyno Results

One of our clients in Europe picked up our 4.4 stroker kit a few weeks ago and quickly built an engine to hit the track. It was tuned with Pectel, just like the previously posted 4.4L S65 we built here at VAC. I should have another dyno sheet coming soon with more range. LOVE the S65....





As always, we have 4.4L stroker cranks in stock
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      04-12-2013, 10:22 AM   #2
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So its about 580 Crank Horsepower @ 8250 rpm.. plus u have to run a compression ratio of 13.5:1 (race gas) and aftermarket ecu to get that. I would like to see some results that we can expect for a street stroker.
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      04-12-2013, 10:28 AM   #3
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With cams I suspect this engine will make 600hp. We may find out soon ;-)

The BMW M2 GTS 4.4L makes 444hp.

The Dinan 'street' 4.6L makes 525hp.
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      04-12-2013, 10:42 AM   #4
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Intriguing
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      04-12-2013, 10:47 AM   #5
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Quote:
Originally Posted by Mike@VAC View Post
With cams I suspect this engine will make 600hp. We may find out soon ;-)

The BMW M2 GTS 4.4L makes 444hp.

The Dinan 'street' 4.6L makes 525hp.
That's pretty schweet! But my 2 questions are:
1) The 2 aforementioned cars.....what octane gas were they using to get those numbers? and
2) How do you think the VAC kit will do on 93 octane? I would ask about E85, but I feel that that might be an unreal expectation.
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      04-12-2013, 11:07 AM   #6
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Why do horsepower and torque cross at 6600 rpm?
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      04-12-2013, 11:24 AM   #7
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nice, but i would hate to have to buy 100 octane at $8.75/gal every day.
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      04-12-2013, 11:48 AM   #8
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High compression. Solid numbers but will vary will 91 oct gas. I would like to see dyno on street gas.
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      04-12-2013, 11:54 AM   #9
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Quote:
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Why do horsepower and torque cross at 6600 rpm?
Torque units in N-m (din Tq). See legend on top of graph
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      04-12-2013, 01:32 PM   #10
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      04-12-2013, 02:05 PM   #11
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Quote:
Originally Posted by whats77inaname View Post
That's pretty schweet! But my 2 questions are:
1) The 2 aforementioned cars.....what octane gas were they using to get those numbers? and
2) How do you think the VAC kit will do on 93 octane? I would ask about E85, but I feel that that might be an unreal expectation.
1. Pump gas.
2. We have only built and supplied track/race engines. Our 'kit' consists of a crankshaft, connecting rods and pistons. You can choose a street friendly CR if you wish

Quote:
Originally Posted by surlynkid View Post
nice, but i would hate to have to buy 100 octane at $8.75/gal every day.
Quote:
Originally Posted by Chriskm3 View Post
High compression. Solid numbers but will vary will 91 oct gas. I would like to see dyno on street gas.
This is a race engine. Octane is your friend This was not built for street use.
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      04-12-2013, 03:11 PM   #12
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Good stuff Mike.

Aggressive cams are a must for that setup. Stage 3 head + this = BOOM!
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      04-12-2013, 03:12 PM   #13
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These guys are super high level engine bosses so more is in store - this is not the only kit they bought
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      04-12-2013, 03:17 PM   #14
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That's a good power increase!
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      04-12-2013, 03:32 PM   #15
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Quote:
Originally Posted by Mike@VAC View Post
These guys are super high level engine bosses so more is in store - this is not the only kit they bought
Awesome.

Aren't these guys located in Spain by any chance?
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      04-12-2013, 08:22 PM   #16
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Quote:
Originally Posted by Mike@VAC View Post
1. Pump gas.
2. We have only built and supplied track/race engines. Our 'kit' consists of a crankshaft, connecting rods and pistons. You can choose a street friendly CR if you wish

I'd like to see where the other 2 engine dynos @ on 100 octane to get a more accurate comparison.
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      04-12-2013, 09:36 PM   #17
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Quote:
Originally Posted by whats77inaname View Post
I'd like to see where the other 2 engine dynos @ on 100 octane to get a more accurate comparison.
The other engines are not designed with a compression ratio of 13.5:1
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      04-12-2013, 09:47 PM   #18
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Quote:
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The other engines are not designed with a compression ratio of 13.5:1

I understand that, but if the attempt was made to show stroker vs stroker vs stroker, notwithstanding the c/r, I'd like to see what each makes when that variable is constant.
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