Turbo for S2K
05-28-2001, 06:16 PM
#11
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i agree with 2x6spds. shouldn't your vendor determine the price, not us? if that's the case, let's all say we'll only spend $2000, and maybe they'll just drop their price!
but more seriously, i'd be more interested in a turbocharger than a supercharger. the supercharger is about $5K when all is said and done, so around the same price range + or - $2K.
but more seriously, i'd be more interested in a turbocharger than a supercharger. the supercharger is about $5K when all is said and done, so around the same price range + or - $2K.
05-28-2001, 06:36 PM
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I am interested, but... I have heard of new (or maybe not so new) Turbo technology that has the Turbo already spinning (electric?) so as to virtually eliminate any Turbo lag. The HP gain for me would have to be 300 + to the wheels, and a much more improved torque curve. 5K max and that
05-28-2001, 10:20 PM
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T3? I would expect the compressor housing to be larger than that... especially on a 2 liter that's moving through air at 9k rpms... consider asking a LOT of questions from numerous people before you let a shop throw something on.
05-29-2001, 10:41 AM
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Well, I've been involved in turbo's for the last 5 years since I got my Eclipse. I'm definitely not an expert, but I do know quite a bit about them.
First, go here http://www.sportcompactcarweb.com/tech01.shtml for a tutorial on turbos/superchargers.
Turbocharging the S2000 is going to present a unique set of challenges - you want minimal lag which implies a small turbo, but the engine revs high which implies a large turbo.
Most OEM turbo implementations today go for a small, low intertia turbo. This provides quick spoolup with minial lag. This list includes the 1995-99 Eclipse, latest Porsche Turbo, Audi/VW 1.8T engined cars. They all have low lag with full boost around 1800-2500 RPMs. However, at higher RPMs (>5000) the boost level starts to fall off as the turbo simply can't flow enough air (cubic ft/min CFM) into the engine to meet the requirements of the high RPM operation.
Other manufacturers have tried to dynamically add a 2nd turbo at a higher RPM to increase airflow at the higher RPMs. This includes the RX7tt and Supra. This is best of both worlds, but at a cost of an extremely complex turbo control system.
In the high HP world, to improve the airflow at high RPMs, you put a bigger turbo on the car. This helps the top, but a bigger turbo has more mass and more lag. Friends of mine have turbo'd a Miata and a Supra and both don't reach full boost unit 4000-4500 RPMs. While this gives a heck of a kick in the pants when it comes on, you have stock or worse power/torque below that point.
So if you are going to turbo the S2000, you'll have to decide if you want low end torque or high end HP. If you put a small turbo on the car, you should get lots of low end torque (probably >50 ft-lbs), but the boost will fall off when VTEC kicks in and you won't get much improvement in HP (10-20 HP).
If you put a big turbo on it, you will not add anything down low, but when the turbo comes on you will make massive amounts of HP at the high end (>350 HP should be no problem).
In either case, you will need a new clutch, new rear diff, and maybe a new tranny very quickly.
My personal feeling would be to fix the weakness of the S2000 which is low-end torque. Put a small turbo running light boost (~5 psi) so lag is almost non-existant. Of course, this doesn't have the sexiness that a 400+ HP monster engine has.
First, go here http://www.sportcompactcarweb.com/tech01.shtml for a tutorial on turbos/superchargers.
Turbocharging the S2000 is going to present a unique set of challenges - you want minimal lag which implies a small turbo, but the engine revs high which implies a large turbo.
Most OEM turbo implementations today go for a small, low intertia turbo. This provides quick spoolup with minial lag. This list includes the 1995-99 Eclipse, latest Porsche Turbo, Audi/VW 1.8T engined cars. They all have low lag with full boost around 1800-2500 RPMs. However, at higher RPMs (>5000) the boost level starts to fall off as the turbo simply can't flow enough air (cubic ft/min CFM) into the engine to meet the requirements of the high RPM operation.
Other manufacturers have tried to dynamically add a 2nd turbo at a higher RPM to increase airflow at the higher RPMs. This includes the RX7tt and Supra. This is best of both worlds, but at a cost of an extremely complex turbo control system.
In the high HP world, to improve the airflow at high RPMs, you put a bigger turbo on the car. This helps the top, but a bigger turbo has more mass and more lag. Friends of mine have turbo'd a Miata and a Supra and both don't reach full boost unit 4000-4500 RPMs. While this gives a heck of a kick in the pants when it comes on, you have stock or worse power/torque below that point.
So if you are going to turbo the S2000, you'll have to decide if you want low end torque or high end HP. If you put a small turbo on the car, you should get lots of low end torque (probably >50 ft-lbs), but the boost will fall off when VTEC kicks in and you won't get much improvement in HP (10-20 HP).
If you put a big turbo on it, you will not add anything down low, but when the turbo comes on you will make massive amounts of HP at the high end (>350 HP should be no problem).
In either case, you will need a new clutch, new rear diff, and maybe a new tranny very quickly.
My personal feeling would be to fix the weakness of the S2000 which is low-end torque. Put a small turbo running light boost (~5 psi) so lag is almost non-existant. Of course, this doesn't have the sexiness that a 400+ HP monster engine has.