[urq] "it's fun" trailer

Mon Nov 6 20:01:30 EST 2006

Yup... 2 of the 3 reasons Honda engines are so popular and successful for tuners.  Short strokes, bigger bores, AND long rods.

-----Original Message-----
From: audijim at comcast.net
To: djdawson2 at aol.com; urq at audifans.com
Sent: Mon, 6 Nov 2006 5:58 PM
Subject: Re: [urq] "it's fun" trailer

With the Bore and Stroke being 79.5 and 85 mm, that is a good combination for a 
high rev engine. Under square = higher revs/higher HP, over square (think 
stroker) = lower revs/higher torque. I'm sure with these specs that this 
combination can obtain the 10k RPM.

 -------------- Original message ----------------------
 Ultimately, to make those power levels, one would have to design an engine that 

 is able to run at quite high rpm... and be willing to deal with a power band 
 that begins at a high rpm level.  My guess is that such an engine would be 
literally dead below 6000 rpm.  If he actually did design the engine like this, 
 that would explain motorcycle pistons and such... low rotating mass... 10k+ rpm 

 capabilities.

> Capacity: 2110cc (128.76 cu. in.)
> BoreXstroke: 79.5 X 85 mm
> Power: 510 bhp @ 7500 RPM
> Torque: 369 @ 6000 RPM

Attached Message
From:djdawson2 at aol.com
To:audijim at comcast.net; urq at audifans.com
Subject:Re: [urq] "it's fun" trailer
Date:Mon, 6 Nov 2006 4:26 PM

There's no question that a 2.1 liter engine *can* make those power levels.  Really, it is just a matter of changing the nature of the "pump"... the pump being the engine.  It needs to be able to flow more air... and that means a capable cylinder head, and a turbo with the ability to move 1 pound of air, per minute, per 10 horsepower... and do it efficiently.

Ultimately, to make those power levels, one would have to design an engine that is able to run at quite high rpm... and be willing to deal with a power band that begins at a high rpm level.  My guess is that such an engine would be literally dead below 6000 rpm.  If he actually did design the engine like this, that would explain motorcycle pistons and such... low rotating mass... 10k+ rpm capabilities.

A turbo capable of moving 80 lbs/min (800hp) bolted to 2.1 liters would be temperamental at best.  When you get to those horsepower levels, you're not talking as much about engine management issues being the limiter, as you are the properties of compressors (turbos).  Unfortunately, that hasn't changed a lot over the years.  A compressor that can flow 80lbs/min will have severe surge problems until very high rpm on such a small engine.

OTOH, the specs you listed are much more attainable.  In fact, there are quite a few of us already running turbos capable of 500+ hp on our 2.2 engines, and it is actually quite streetable.  Yep... higher boost threshold, but tolerable surge characteristics.  On my UrS4, I run a GT30R Garrett that flows over 50lbs/min.  It has shown 442hp at the wheels on a dyno.  Convert that back to crank hp, and it is probably around 500.

Anyway... just another .02 on the topic.

Dave

-----Original Message-----
From: audijim at comcast.net
To: urq at audifans.com
Sent: Mon, 6 Nov 2006 3:18 PM
Subject: Re: [urq] "it's fun" trailer

More pictures of the 10 valve SQ. It looks like the same car in the video, sans 
the www decal on the rear bumper. It looks like an UrQuattro conversion due to 
the A pillar angle. I'm almost sure he has a real (except aluminum block) Trans 
Am engine. I have some detailed pictures of the #44 car and the engine's are 
very close in comparison. The IM and valve cover are either the real thing or 
great reproductions. the upper turbo mount that straddles the valve cover and IM 
are looking pretty close to the T/A car. Who ever stated that they thought the 
Trans Am car was in the ball park of 650 hp was close. I have a rare Audi 
Motorsport USA book that compares the Audi 200 Trans Am car to the Audi 200 
production car. The back page has all the specs. Some of them are:

Capacity: 2110cc (128.76 cu. in.)
BoreXstroke: 79.5 X 85 mm
Power: 510 bhp @ 7500 RPM
Torque: 369 @ 6000 RPM

So why couldn't this power plant make 650-800 hp with todays management 
technology?

http://www.kimmit-sport.com/gallery/index.php
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