How much HP to spin V1 S-Trim?

Razorback · Apr 8, 2005

I've always wondered about this -- I'm making roughly 450-470 at the wheels on a dynojet -- if my car was N/A you could generally divide by .85 and get the approximated flywheel #'s, but with a supercharger how do you know how much horsepower it takes to spin the blower when trying to get a rough figure of how much overall power you're making?

Thanks for any input.

Blown284 · Apr 9, 2005

Razorback said:
I've always wondered about this -- I'm making roughly 450-470 at the wheels on a dynojet -- if my car was N/A you could generally divide by .85 and get the approximated flywheel #'s, but with a supercharger how do you know how much horsepower it takes to spin the blower when trying to get a rough figure of how much overall power you're making?

Thanks for any input.

I'm glad I'm not the only one wondering this question.

Anyone have any ideas?

Mysticobra96 · Apr 9, 2005

I think its around 20hp to spin the blower obviously w/more boost you will need more hp I would think.

Tim351 · Apr 9, 2005

I thought it was more like 60-80hp ,and more if its overspun

STOKED · Apr 9, 2005

I could have sworn I read that John M. said it takes 150 hp with a t-trim\cog setup spinning the blower to the max. I could be totally wrong though so don’t quote me.

Razorback · Apr 9, 2005

Tim351 said:
I thought it was more like 60-80hp ,and more if its overspun

I thought it was in the ballpark of 50-75 on small blowers like the S-Trim -- hopefully one of the guru's will chime in -- where you at Dave??

Ralph Greene · Apr 9, 2005

Slightly off the question, but I always figured if you have 500 RW, and losing at least 15% to driveline losses, and another 50-75 to turn the blower, you need a fuel system that can feed about 700 HP. You have to fuel the power it takes to run the blower and the power lost to drivetrain losses.

Mysticobra96 · Apr 9, 2005

The reason I said 20hp is cuz I think I asked this question before because I wanted to find an electric motor that made enough hp to turn the blower. So, I could run a belt from the motor to the blower and be able to hit max boost at the flip of a switch. I looked forever but there arent many electric motors that make 20hp and fit anywhere in our engine bay and only require 14v. If its over 20hp then I really think my idea is shot to ****. But I found plenty of motors that make 20hp at higher volts like 48v+ So if you dont mind hooking up 4 oddessey batteries series it might be doable.

VenomousCobra · Apr 9, 2005

A 20HP motor will be huge,no matter the voltage. Plus the weight of the batteries and motor, would probably cost you more ET than just driving it via belt from the engine.

How much HP to spin V1 S-Trim?

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