K24 into S2000 Race car SCCA build
06-25-2018, 08:56 AM
#841
Thread Starter
400hp you can do with your current engine NA, with different cam, maybe different heads, and letting it rev.
Luke said the engine was 600hp on pump gas, which could be managed without too much fanfare. At worst, there are nice sequential gearboxes that can handle it. If you want to do some work, a BMW M3 DCT could be adapted; Garage Whifbiz did that for the Supra using a Syvecs S6+(they are a dealer). A modern ECU will let you run traction control to keep everything under control, even incorporating a yaw sensor, g-sensor, steering angle, and throttle position. With DBW, you should be able to change the throttle sensitivity curve to also make it more drivable. Throttle maps and tire wear - OptimumG
The extra power also lets you get more aggressive with downforce.
What class are you currently targeting? ST3?
Luke said the engine was 600hp on pump gas, which could be managed without too much fanfare. At worst, there are nice sequential gearboxes that can handle it. If you want to do some work, a BMW M3 DCT could be adapted; Garage Whifbiz did that for the Supra using a Syvecs S6+(they are a dealer). A modern ECU will let you run traction control to keep everything under control, even incorporating a yaw sensor, g-sensor, steering angle, and throttle position. With DBW, you should be able to change the throttle sensitivity curve to also make it more drivable. Throttle maps and tire wear - OptimumG
The extra power also lets you get more aggressive with downforce.
What class are you currently targeting? ST3?
06-25-2018, 10:33 AM
#842
At 5k that is 420 lb-ft of torque, at 7500 it is 280. Are you planning on a declining torque curve to maintain constant power? Of torque dropped off 10% at peak, it would be ~550hp at 7500 rpm.
BTW, your radiator...the one with the air intake...may be far and away the best solution for this application, both cooling the engine and providing lower temp air into the turbo. I'm always amazed how many S2000s feed the turbo with air heated by the intercooler, oil cooler, A/C, and radiator. I'm also surprised all the 800hp turbo S2000s aren't knocking your door down asking for one.
06-25-2018, 11:02 AM
#843
Not quite that fragile...a more or less flat torque peaking at around 400 hp. Assuming quality parts on the valvetrain and bottom end, the engine should be quite solid in the engine builders recommended rev range. 5000-7500 is the rev range for a pushrod V8, a VTEC I4 with roller rockers, smaller valves, smaller diameter, much lighter pistons and shorter, lighter rods should handle quite a few additional revs. For the practical issues of oval and road racing, I'd like a little broader power band, maybe 40% of the range. For a 7500 rpm redline that would be 4500-7500. There are times where traffic or a slow corner could force a shift that a little more grunt would let you avoid.
At 5k that is 420 lb-ft of torque, at 7500 it is 280. Are you planning on a declining torque curve to maintain constant power? Of torque dropped off 10% at peak, it would be ~550hp at 7500 rpm.
BTW, your radiator...the one with the air intake...may be far and away the best solution for this application, both cooling the engine and providing lower temp air into the turbo. I'm always amazed how many S2000s feed the turbo with air heated by the intercooler, oil cooler, A/C, and radiator. I'm also surprised all the 800hp turbo S2000s aren't knocking your door down asking for one.
At 5k that is 420 lb-ft of torque, at 7500 it is 280. Are you planning on a declining torque curve to maintain constant power? Of torque dropped off 10% at peak, it would be ~550hp at 7500 rpm.
BTW, your radiator...the one with the air intake...may be far and away the best solution for this application, both cooling the engine and providing lower temp air into the turbo. I'm always amazed how many S2000s feed the turbo with air heated by the intercooler, oil cooler, A/C, and radiator. I'm also surprised all the 800hp turbo S2000s aren't knocking your door down asking for one.
A proper intercooler will be much more effective at keeping IATs down compared to a "CAI" on a turbo setup.
06-25-2018, 01:32 PM
#844
Thread Starter
Stock head, Stock cams, Small turbo. I don't expect it to make "crazy" hp numbers. I bet the torque peaks in the 5k range. We will see. New to the turbo thing. Just getting my feet wet. I want it to make 15psi by 3k rpm. Thats the hope.
06-25-2018, 04:31 PM
#845
If you want to help with response, you can make the hot side of the piping a bit smaller than the cold side. 2" vs 2.5" for example.
06-26-2018, 07:57 AM
#846
Thread Starter
15psi by 3000rpm may be a bit optimistic. 3800rpm may be more realistic. Depends on your turbo but still. 3800 for 15psi seems more plausible.
If you want to help with response, you can make the hot side of the piping a bit smaller than the cold side. 2" vs 2.5" for example.
If you want to help with response, you can make the hot side of the piping a bit smaller than the cold side. 2" vs 2.5" for example.
06-26-2018, 10:28 AM
#847
Whats your estimated time of completion?
06-26-2018, 10:45 AM
#848
Thread Starter
Will be an interesting setup! Should boost fairly quickly, making it a useful powerband! I was looking at numbers from 9th Civic with the K24 and a gt30 but they have the built in ehxaust mani which should have a negative impact.. Should be closer to 3400rpm. But either way, thats a very good RPM range and useful for the track!
Whats your estimated time of completion?
Whats your estimated time of completion?
