Dyno run for the 300

Mr HollowPoint

Mr HollowPoint

Well-Known Forum User
We finally managed to get the 300 on the Dyno at the weekend. 406bhp with 422 ft lbs of torque, at 14-15psi. Not a proper dyno run, with AFR and boost readouts etc. just a free-for-all dyno day with 3 basic power runs. They had trouble keeping it on the rollers, he said it kept slipping and he never got to the 18 psi boost setting :( Still happy with the numbers though.

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It's going to go more powerful before next year, but need to devote some time and money to the 280 for a bit.

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Good figures!

How can they accurately plot the power at the flywheel when it is being measured at the wheels? Surely it's an estimate with an assumption of transmission loss?
 
That makes sense, because he blatently took it out of gear after hitting the rev limiter on each run, then let it freewheel.

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I would have suspected you would want the car out of gear to measure that, as if it was in gear, you would be measuring with the engine connected......?

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He would hit the rev limiter, then sounded like he took it out of gear and revved it. Then looked like it was free wheeling down.

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Ok that makes sense now, as long as he ran it down to a complete stop.
I wish someone would write a book on RR loss adjustement.
 
the smartest rolling roads know the weight/inertia of the rollers and have a powered roll down, this is done in the gear the full power run is done in, it then works out the resistance on the rollers during the roll down thus giving the resistance of the cars drive train.
 
I think this was a pretty basic system to be fair. My car was twice as powerful as any other car that ran that day and as you can see in the pic, they had to have two guys sit in the boot to keep it on the rollers.

The car would probably have hit somewhere close to 450bhp @ 18psi on a decent dyno, where it wasn't slipping the rollers and stuff, but he wouldn't go above 14psi as he was bricking it and said it was slipping the rollers on power delivery.

I'll be putting a bigger set of injectors in it later this year and heading down to see Noel for a proper mapping session too, as the ECU is one of his 'guestimate' off the shelf tunes at the moment, just based on the mods that are on the car. Should be a fun result.

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Ian said:
It will measure the deceleration of the rollers to work out the Transmission losses, also known as drag power. The Wheel Power plus the Drag Power gives the estimated flywheel power.
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franky said:
the smartest rolling roads know the weight/inertia of the rollers and have a powered roll down, this is done in the gear the full power run is done in, it then works out the resistance on the rollers during the roll down thus giving the resistance of the cars drive train.
Click to expand...


Glad I asked, thanks. :thumbs:
 
Mr HollowPoint said:
The car would probably have hit somewhere close to 450bhp @ 18psi on a decent dyno, where it wasn't slipping the rollers and stuff, but he wouldn't go above 14psi as he was bricking it and said it was slipping the rollers on power delivery.

I'll be putting a bigger set of injectors in it later this year and heading down to see Noel for a proper mapping session too, as the ECU is one of his 'guestimate' off the shelf tunes at the moment, just based on the mods that are on the car. Should be a fun result.
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Impressive, almost 300bhp/ton. That's possibly a sub 12 second car:thumbs:
 
Mid 12s at a guess, z32s are a pig to launch and often spend the first portion spinning. Once traction takes over it's a different story, something to do with anti tramp? Anyways the only real way to know is to try I guess.

Did you guys use the gt525 turbo setup in the end? Who mapped it? Shame they couldn't get full boost hooked up. I'm sure your right that you would have seen higher figures if they had.
 
The map is an off the shelf one from Noel mate, it's a 'guestimate' one for the mods I have, without putting the car on a dyno. Car still has standard tubbies and injectors at this point mate.

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Oh well that's fantastic many achieve less than that on uprated tubs and injectors. Just goes to show how good a mapper Noel is even with generic chips. Mines waiting to be booked in with him as it either over fuels or detonates in various ways, fix one issue cause another...so the plan is to get it safe ready for the summer then go mental next winter
 
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