ran my 911 turbo 2 3.3 1 bar spring hayward and scott exhaust and induction cone the car produced 324 bhp with 351llb/ft of torque at 0.9 bar these are flywheel figures do they sound about right
will scan in graphs later
im missing 0.1 bar the technician said i should install an apexi controller and get the full 1 bar as i would gain another 20bho and 20 llb/ft of torque,full boost 0f 0.9 bar omes in at 3100 revs and stays there until the end ie 5800 revs
why is the bhp only 324 but torqye figure higher

 

What type of dyno is this? How was flywheel HP calculated?
There is a bg dfference between an accelerometer drum dyno (dynojet 248c) and a real load/accelerometer dyno (mustang, land/sea, etc.)
Can you post the sheet?

Also - the torque being higher than HP depends on the hardware and tune - not necessarily a bad thing. The most suspect thing in this situation is a lean condition up top on CIS with 1 bar.

 

The numbers you get at the dyno are measured at the wheels. There is a 15% drivetrain loss so just multiply whatever numbers you get by 15% and thats what your getting at the flywheel.

With the K27-7200 turbo and a 1 bar spring, you will get 1 bar at lower rpm and it will drop to 0.9 at higher rpm as the K27 7200 cannot flow as much air as the K27 high flow or K29 turbos. Its normal what your getting. It shld start dropping to 0.9 bar at 5200 rpm onwards to redline.

 

the boost never hits 1 bar 0.9 at 3200 revs and stays there trought the whole rev renge therefore suggestions were to put in a apexi tail pipes were to large therefore could not get a an air fuel ratio probe needs to go in throgh the oxygen sensor
the dyno is very accurate can take upto 2000 bhp cars the car is strapped down to dyno and run.

 

Ok than you sure you got a 1 bar spring in it? Any leaks in vacum hoses?

 

Sameer - I wasn't really asking, I think you missed the point of my post.
Load dynos and non-load dynos can vary by 13%. This IS NOT THE DRIVETRAIN LOSS - that is added AFTER this difference.

If your dyno is a mustang type, you are around 400 HP.
This is common knowledge in large tuning markets (EVO, Supra, etc.)
Porsche guys don't know this because a lot of Porsche tuners don't even use a dyno, much less know the difference between eddy brake and hydraulic brake load. Porsche tuners will bolt **** on your car, and give you speculation and expect you fall for it if they use a condecending tone.
Guys like Fairfield County Motorsports - don't even use a dyno!! Yet everyone brags about them - ****ing hilarious. They'd be about 15 minutes in business if they were tuning in a market with more compettion.

By the way, I'll be more than happy to meet ANY FCM 2.5 951 at the Mustang dyno in Danbury, so if you open you mouth here, I will close it for you.

Okay done ranting now - no coffee yet.

 

911 2;

As I have said a few weeks ago I ran my stock '92 (1bar spring) on a Mustang dyno and got 283.3 Max HP and 330.7 Max torque at the wheels. As special tool mentioned which dyno is it? Can you give us the power at the wheels?

Are you running the stock turbo. It will be spent above 5200 RPM..

 

Special tool, everything you said was great, but you just destroyed it with this sentence.

I am not exactly the type of person who falls for tuner claims but I don't see how you can generalize about all Porsche tuners, many of them are very respectable and are engineers with years of experience in racing and other, many on this board actually go the extra mile and provide free advise to many of us. Also, I have not seen any tuner bolting on sh*t and being able to start a car, I am sure you meant something else? Was it the lack of coffee in your system?

 

is it possible to purchase a 0.9 bar spring
the figures given are at the flywheel the dyno is one which works by pulling the car down onto the rollers i dont really know my dynos very well ill find out and let you know

 

Jean - yes, absolutely. I am cranky in the morning. Some of them are definitely full of **** though.

 

Is it a Maha dyno?

 

special tool,
I was replying to 911 2 in the 1st thread of this topic.

 

Where does the "Dynapack Chassis Dyno" fit into these different types? better-worse-closer to reality?

Kevin mentioned these 'stocker' numbers (283-RWHP/330-RWTQ) as a 'reality check' before when I posted my 100k mile stocker (except for K27-7200 and cat bypass) baseline a few weeks back (231 RWHP, 258 ROTC). I was amazed that stock can produce such RW values. I assumed/ applied the standard 15% thing to my figures for FW values, and accept them for the standard published '86 numbers but from a 'tired' engine.

My highly regarded MA "racer-tuner" was indifferent about the figures, but suggested a few things like freshening the heads, header-muffler and 1 bar spring to get the "beast back" into 300 RWHP & TQ territory.

I don't think he throwing crap around or displaying attitude either Lutjen, but just stating some proven mods backed by experience, racing feedback and Dyno validating. I've been to a few guys around NE now, and I've learned to look for a Dyno on-site and the Prove-to-Me language of their success.