280 WHP - 200 WHP = 80 WHP.

Why would a "downpipe" help with a supercharger?

 

^ I'm guessing he meant "testpipe."

 

please leave this thread, and maybe the site.

you cant seem to understand the difference between crank hp and whp.
everytime the other members mention a particular amount of hp, they specify what type of hp they are talking about. you failed to realize that TWICE. now leave.

 

Take it easy! He meant no harm, nor did he break any forum rules. Misunderstandings about HP and WHP happen all the time. These things merely need to be clarified. You only need to ask for clarification or point out the discrepancy. There is no need to get "hostile". Until rules are broken, ALL are welcome here.

 

What gives you the right to say that?

 

I'll try to be more specific:

- My car had 195 RWHP (rear wheel horse power), prior to the SC installation

- After the "out of box" (no tuning) installation the Dyno gave a reading of 280 RWHP

This represent 85 RWHP increase or in other word about a 45% increase in power.

When you drive an SC car you will certainly feel the power gains. It is quite scary!

Kevin

 

 

haha i can distinguish fine between rwhp and hp at the crank. Im new with s2000s so im not sure whats what. I always thought the stock hp for a s2k was 240 hp but thats obviously not to the wheels. 280-240= 40 hp gain. but now that i know an s2k is 200 hp to the wheels stock or as u say 195 it makes sense now.

now that thats over, do you think headers and an exhaust would add 20 rwhp? (i badly want to be able to say i have 300 rwhp on a tiny s2k) itll be bad ass either way

 

The 280 represents rear wheel horsepower. The 240 represents power at the crankshaft. You can't add or subtract both hp and rwhp at the same time. You can add or subtract hp and rwhp by themselves.

kstokell's car dynoed at around 195 RWHP stock from the factory. That is differen't from 240 HP. (at the flywheel) After kstokell installed a supercharger, he went back to the dynometer. With the supercharger, the dyno showed 280 RWHP. If you subtract 195 RWHP from 280 RWHP, you get a gain of 80 RWHP. Get it now 280 RWHP (at the rear wheels) is approximately 320 HP. (at the crankshaft) If you subtract 240 HP (at the crankshaft stock from the factory) from 320 HP, (at the crankshaft after kstokell installed the supercharger) you get a gain of about 80 HP (at the crankshaft)

Some more info on horsepower: (compliments of Merriam - Webster)

Main Entry: horse

 

Nope! Not a chance. The S2000 is so finely tuned from the factory, it is hard to extract significant amounts of power by just adding simple bolt-on's. A Mugen header gives a gain of about 8-12, lets just stick with the term hp. This 8-12 hp is in the middle of the power band at around 5,700-6,400 rpm's. The F20C motor puts out peak power at around 8,200 rpm's meaning that this 8-12 hp amounts to just about ZERO gains at the F20C's peak.

On the other hand, the T1R exhaust (with test pipe) has been known to produce peak (overall gains) of about 8-12 hp. So to answer your question, no, you won't get 20 OVERALL peak hp from a header and exhaust. The 8-12 hp gained at the middle of the powerband (not overall) from the Mugen header is very important as this engine needs more juice at that range and is a very big improvement.