what to do with this

Woody928

Woody928

Events Officer
Staff member
Club Member
Those are some seriously impressive numbers! :eek:

How much does that thing weigh? The power to weight must be mind boggling. Showing my lack of knowledge here with these BMW engines but I thought the idea with supercharging like this was to get bucket loads of torque?

I'm not suggesting there's not a lot because there's a crazy amount. I just would have envisaged the number would have been somewhere nearer to the hp figure... (please don't shoot my ignorance down :))
 
tel240z

tel240z

Club Member
johnymd said:
That's a scary amount of power. 600hp at the flywheel put's my 484hp to shame. With your setup being 100kg or so lighter then I need to find another 150hp just to match your power to weight. Looking forward to seeing it run at santa pod next weekend. I think I'll leave the blue car at home and just spectate.

Your terminals will be interesting. Last time my car ran well was with the factory ECU and turbo's and run the 11.10@132.58mph. That was with 424hp at the flywheel.
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Strangly enough John it feels quite planted, i will be going pod next sunday but will be using 5th and see if i can use that extta power

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tel240z

tel240z

Club Member
johnymd said:
That's a scary amount of power. 600hp at the flywheel put's my 484hp to shame. With your setup being 100kg or so lighter then I need to find another 150hp just to match your power to weight. Looking forward to seeing it run at santa pod next weekend. I think I'll leave the blue car at home and just spectate.

Your terminals will be interesting. Last time my car ran well was with the factory ECU and turbo's and run the 11.10@132.58mph. That was with 424hp at the flywheel.
Click to expand...
So my engine could be making 525 hp less the gearbox and diff friction

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johnymd

johnymd

Club Member
Did they give you a flywheel figure or indicate the loses through the drivetrain? I wasn't considering the fact that on a hub dyno there are no tyre losses. What do you consider it was making at the flywheel. All my figure are flywheel so it would be interesting to compare.

The blue car is back together now so I may join you at the strip on Sunday.
 
tel240z

tel240z

Club Member
Mark N said:
I didn't think they were as much as that.
Is that rating based on flow at 90psi (I'm assuming you are on stock injectors and FPR)?
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No not stock injectors some american make will be pulling them out soon to see what they are then upgrading maybe a couple of hondred cc
 
johnymd

johnymd

Club Member
Don't go too big Terry or you will lose the ability to control the fuelling at low usage (cruising or on tick over). They do say no more than 85% duty. How close to this are you?

My advice would be to either buy expensive or have them flow tested. You can then trim the individual cylinders to suit the flow of each injector. That's what I did with my denso's as they were not perfectly matched. You can do it by checking the plugs and trimming the injector duties to suit what you see.
 
tel240z

tel240z

Club Member
I had them cleaned and tested when i put the low comp pistons in John, the tuner did say to me not to go to large as you say low end will suffer i took a little bit of on board footage with Shaun holding the i phone you can see the afr guage (middle) quite steady but i cant remember what i was reving at the hump at the end of our private test track took him by surpisehttp://cloud.tapatalk.com/s/59594f3c617db/VID-20170701-WA0011.mp4


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tel240z

tel240z

Club Member
johnymd said:
Did they give you a flywheel figure or indicate the loses through the drivetrain? I wasn't considering the fact that on a hub dyno there are no tyre losses. What do you consider it was making at the flywheel. All my figure are flywheel so it would be interesting to compare.

The blue car is back together now so I may join you at the strip on Sunday.
Click to expand...
So your flywheel is calculated then john to whatever they presume the drivetrain and tyres sap up so your hub/wheel hp could have been around 450ish then add the 30 odd hp that the drive train uses and your at your 480ish i think....the dyno i used is also used to check formula race cars at the track side as part of scrutineering
 
tel240z

tel240z

Club Member
No scrap that John your dyno figures must have been around 520 at the wheels to give a f/w hp of 484

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Alphabettispaghetti

Alphabettispaghetti

Club Member
No, to calculate flywheel bhp, which if measured on a rolling road where they measure wheel bhp its always a calculation.

The flywheel weight of the rolling road is a known mass that takes 'x' amount to move it, on a coastdown a backwards calculation is suppose to measure drive train resistance(IIRC).
 
Mark N

Mark N

Club Member
tel240z said:
No not stock injectors some american make will be pulling them out soon to see what they are then upgrading maybe a couple of hondred cc
Click to expand...

I think that 040 fuel pump rating of 700 bhp may be based on a N/A engine with a 3 bar base fuel pressure.
Correct me if I'm wrong but I believe your engine runs with a 5 bar base pressure before the FPR increases it to account for the 1 bar boost.
As well as that your engine is also less efficient than it originally was due to the lowered compression plus the parasitic loss from the blower requiring more fuel and air to make power.

040s aren't used that much in the Skyline community except as low pressure lift pumps to supply surge tanks.
Bosch 044s are more commonly used in-tank with a pick-up filter/sock.

I don't know if you have seen these articles but I found the first one when I was researching the Phantom system:

http://aeromotiveinc.com/wp-content/uploads/2014/12/TB_501_Fuel_Pumps_and_HP_02.pdf

http://www.radiumauto.com/Blog/Post/Radium-s-Ultimate-Fuel-Pump-Test-100
 
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