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  #11  
Old 11-21-2013, 09:52 AM
Sleepy_Steve Sleepy_Steve is offline
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OK then, where's the best place to source an ATI damper? Best I see is Summit at like $445... Is it the kind of thing you generally buy new?

How high can you spin the motor reliably without a fancy lightweight clutch and damper? 6800? 7000?
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  #12  
Old 11-21-2013, 10:18 AM
Def Def is offline
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Are you building this to a class? What are you trying to accomplish with the engine?

Trying to get an NA KA to spin up high and last a long time is pretty $$$, and by the time you start making good power you're going to drop the engine life by quite a bit.


You already have a Bikirom right? Have you looked at what a T28 turbo setup would run? You could do a stock SR manifold with a KA flange welded on for dirt cheap, reliable stuff. Then cheap eBay parts around the T28. Put in some STi 525 cc injectors - a reliable ~250 rwhp with tons of torque.
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  #13  
Old 11-21-2013, 01:22 PM
Sleepy_Steve Sleepy_Steve is offline
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The thought is to build it for TTE with NASA.

I know... there is a hoosier shod super charged miata, but it's the cheapest class to run with people actually running in my region.

2700 lbs, tune for 158hp over the widest possible range, pull timing where needed to be compliant like the guy with the supercharged miata does.
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Old 11-21-2013, 01:56 PM
jfryjfry jfryjfry is offline
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See if powerbond makes one for your motor. I got a new harmonic balancer for the sr 20% reduction for ~$200.
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Old 11-21-2013, 03:20 PM
Def Def is offline
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Can you run a turbo and stay in TTE if you keep it at 150ish rwhp over a huge range? No reason for RPMs on a KA at that power level. It will be a lot of work to keep power up that high at higher rpm.
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  #16  
Old 11-21-2013, 04:24 PM
Def Def is offline
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The more I think about it, the more a T28 at super low boost and SR 370cc injectors makes sense and could be done super cheap. You can taper the boost down towards redline and pull timing, it'll be a reliable 93 octane setup, and run something like 12 psi at spoolup to have almost a flat powerband. Run some S14 tiny cams to bring back the low end and limit power up top.

Do they also weight based on peak torque?
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  #17  
Old 11-21-2013, 04:58 PM
240sxTTC 240sxTTC is offline
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No official rule on torque yet however area under the curve is considered when re-classes are done especially in the lower classes.
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  #18  
Old 11-21-2013, 05:41 PM
Def Def is offline
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So no hard and fast rules? As in a tapering turbo setup making the 158 rwhp at 2700 lbs would not be classed in TTE? But a 2.4L NA setup making 158 rwhp would?
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  #19  
Old 11-21-2013, 09:37 PM
Sleepy_Steve Sleepy_Steve is offline
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If they let a supercharged miata do it, I don't see why you can't do it with a tapering boost turbo on a 240... I haven't payed much attention to the forced induction rules regarding power to weight re-class in a while though, so I'd need to double check that.

S14 turbo in need of a rebuild and SR injectors I already have... but all the charge piping, manifold, down pipe and what not I'd still need to source / make.

Still, an NA build seems harder to screw up.
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  #20  
Old 11-22-2013, 07:13 AM
gbeaty gbeaty is offline
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Quote:
Originally Posted by 240sxTTC View Post
KA24DE will not last long at 7200rpm w/o an ATI Damper. Also a super light clutch/flywheel combo improves durability.
What would you limit RPM to on a stock motor, if endurance and durability were a big concern (read: Chump Car).
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