s2000 engineand torque?

[mikeperformance21]

hey guys first post.. just wondering why the s2000's engine has such a high redline, i mean what is different about this engine compared to most engines...and what is the best way to improve the engine's torque without using a super charger (but use a turbo) or nitrous?

[gomarlins3]

Outputs:
AP1 (00-03)- 240 HP 153 lb.s tq.
AP2 (o4-present)- 237 162 lbs. tq.

We have found that there are no mods short of boost that will get you more than 25 WHP no matter what you combine unless you spend over $5000. You can buy a stand alone ECU, ITB, single exhaust, header, and test pipe and you may see 25WHP, but you have also now spent as much as a SC w/AC set up and are down 75 WHP to the guy with the boost. There are some people that put NOS on their S, but not many. I have no experience with it, so I won't pretent to know what I am talking about when it comes to NOS.

[bjurasz]

The S2000 has such a high redline because its about the only way to make good horsepower from such a small displacement engine. And the variable valve timing is the only way to make the engine rev that high without having zero torque at ordinary revs during normal driving.

When you ask to improve torque, I assume you mean improving torque at the lower rpm's. Note that any modification that improves horsepower does so by increasing the torque of the engine. The only difference is in what part of the rpm band the torque is increased. Increase the torque at high rpms (as VTEC does) and you get a big boost in horsepower.

So assuming you want more low-end torque a turbo is your worst bet and I'm not sure why you'd want to go that route. Turbos have little effect at low rpm's. Superchargers normally work well at low rpms but only if they are a Roots-type blower. The S2000 SC's I've seen are centrifugal, which basically makes them a pully-driven turbocharger, which means no real low-end boost.

[bjurasz]

By the way, this is a great link explaining torque and horsepower. Notice that Honda decided to make their torque at the higher rpm's, and I think you'll understand why after reading it.

http://vettenet.org/torquehp.html

[gomarlins3]

If you want the FEELING of more torque, you can change your rear end gears. You don't actually gain any more torque, but you go throught he rev range quicker, so it feels like you have more torque.

[mikeperformance21]

Originally Posted by gomarlins3

If you want the FEELING of more torque, you can change your rear end gears. You don't actually gain any more torque, but you go throught he rev range quicker, so it feels like you have more torque.

this would not cost much would it??

-and about the turbo i would still like to turbo it for more horsepower but i keep hearing that not many people turbo a s2000....why?

[gomarlins3]

Originally Posted by mikeperformance21

this would not cost much would it??

-and about the turbo i would still like to turbo it for more horsepower but i keep hearing that not many people turbo a s2000....why?

Actually, many people have turboed their S, the problem is it will not pass smog in CA so very few of those have been done. If you are serious about turboing your S, check out these two websites:
S2000Turbo.com :: Index
Forums -> Forced Induction by Inline Pro
The 2nd one is much more active thanthe first.

As for gears, I bought mine already installed in the diff (much easier I thought) from HTG. The upfront cost is a little steep, but when you return your old diff to him, he credits you $1,000. Here is the link:
hardtopguy.com :: HTG PERFORMANCE PRODUCTS :: Installed 4.77 Final Drive
I linked you to the 4.77's, but he will also do the 4.56's if you want. Great guy and wonderful service. I have purchased many items from him.

[bjurasz]

I would not expect changing rear end gears to cost much, but be sure you get a shop that really knows how to setup a differential correctly. A numerically larger ratio back there does not increase the torque produced by the engine, but it very definitely increases the torque where the tires meet the pavement. A pair of gears is, after all, nothing but a lever.

[mikeperformance21]

ok thanks everyone im not getting a s2000 any time in the nesar future though im just trying to get info on alot of cars and so far i narrowed it down to the 350z and s2000...now i think i have realized the 350z is evil