Hi guys,

Can someone explain to me the difference between whp and torque? My dyno numbers confuse me as most people have higher hp numbers than torque. My car dynoed at 442 whp and 475 torque. I see people with 500 whp with less torque than me. Is this a bad tune? Need some insight. Thanks.

 

Woah those are some big torque numbers! Are you still on the LS1? 442 whp sounds good for a nice H/C/I setup but I would guess torque numbers would be in the low 400's. 475 doesn't sound right to me for an N/A LS1. What setup are you running?

 

About sums it up

http://www.vettenet.org/torquehp.html


What mods are on the car?

Peace
Chip

 

I have the A and A procharger, 7 lbs boost. LG LT, X- pipe, no cats, stock cat backs. Im intending on upgrading the intercooler. Everything else is stock. I had a different tuner install and dyno it. The dyno numbers are confusing me. Do you know of anyone else with ratios similar?

 

Here is another article on that topic.

http://corvetteactioncenter.com/tech/hp_torque.html

 

Put simply, horsepower is torque multiplied by RPM (then divided by 5250). Look at any torque/power dyno plot, and they will always cross at 5250RPM. Above 5250RPM, HP must be higher than the torque at that RPM. It must be.

But you can have localized peak torque values below 5250. This means that as RPMs are increasing, your torque is falling off, causing your peak HP number to be lower than your torque.

To me, that sounds suspicious. You either have a restriction that is causing the dropoff, problems with the supercharger head unit, or you have some bad tuning. A full list of mods, along with dyno plots would certainly help. No matter what the cost, go see an experienced FI tuner. A cheap tune may save you a few hundred upfront, at the cost of thousands of engine repair later on.

But to quickly answer your question, I've never seen a gas engine have less power than torque. Diesels, all the time, because they don't rev as much. It's also possible that the head unit you have just runs out of steam at higher RPMs. You sure it's pullied correctly. Assuming it's the Vortec Si-V2 trim (base A&A kit), then I'd find your results very a-typical. Normally, the A&A kit puts up much higher hp numbers than torque. But if it's pullied too much, it could be producing more air at lower RPM and then running empty at higher RPM. But my first bet would be on the tune.

Now my own FI setup is 501rwhp/493tq. That's with an ECS Novi 2k.