Toda Piston Set

[nsxotic911]

.. Anyone use or have thoughts?

http://todaracingusa.com/category?section=product&omid=1&cid=25&id=39

HONDA C32B
93.00mm *5 *6
Displacement
3179cc
Crown Volume *1
23,1cc/19.7cc
Projection Height *2 -0.5mm
Compression Ratio *3 12.1:1

1. *1 Crown Volume is measured from the piston shoulder/ from deck of the block
2. *2 Piston shoulder height is measured from the deck of the block
3. *3 Compression Ratio is only for reference use only, actual compression should be measured
4. *4 TODA Campulleys are required
5. *5 Factory connecting rod bushing cannot be used -- what does this mean? I didn't see "Toda bushings" for sale anywhere.
6. *6 C32B head gasket required due to the bore diameter

Sounds fairly plug and play.

A few questions:

1. Anyone have experience?
2. Are any other parts needed?
3. Works with the stock ECU, stock + AEM FIC or AEM standalone?
4. It appears to be higher compression... does that mean no-no with FI or does good tunning and a thicker headgasket mitigate this..
5. If the entire set is replaced... is a 'full rebuild' still needed?...eg: do you have to hone cylinders/massage the block... or can you just take old ones out and put new ones in

 

[Daedalus]

See the thread about Stuntman's crank failure, and comments about how important balance could be on the rotating assembly. As much as this would cost, why not just go FI?

Just saw your edit. Not a good thing to do with FI. If you put these in and then reduce CR to run FI, then what's the point? Just to get lighter pistons?

 

[nsxotic911]

See the thread about Stuntman's crank failure, and comments about how important balance could be on the rotating assembly. As much as this would cost, why not just go FI?

Just saw your edit. Not a good thing to do with FI. If you put these in and then reduce CR to run FI, then what's the point? Just to get lighter pistons?

I'm already FI, 7 PSI Whipple kit.. :tongue:. I'm just thinking about options if I do a rebuild. I know this is higher compression so that will need to be..worked with.

When you say 'balance," is that something a builder would need to do or as part of the set. You don't trust Toda...?

 

[ScienceofSpeed]

This piston set is not compatible with the factory FRM cylinder liners (so they are not a drop in part for your C32B). You must sleeve the block with iron liners (and regardless, a block should always be honed to size with new pistons due to cylinder ovaling. Obviously I am biased, however I consider these a much better value and are typically within 1-2 grams of each other (not sure if that was a consideration).

http://www.scienceofspeed.com/products/engine_performance_products/NSX/ScienceofSpeed/pistons/

However, what are you trying to achieve (hp number, etc)? This type of engine modification may not be needed for what you're looking for.

Cheers,
-- Chris

 

[nsxotic911]

Interesting - any reason why Toda hasn't mentioned that on their kit specifications?

Who's the manufacturer of the SOS pistons?

 

[Daedalus]

When you say 'balance," is that something a builder would need to do or as part of the set. You don't trust Toda...?

By balance I'm referring to the engine as a whole, as are the posts in Stuntman's thread, I'm fairly sure. The crankshaft is balance-weighted and torsionally damped to achieve a certain laundry list of requirements (compromises); performance, smoothness, stresses, harmonics, longevity, etc. By using lighter pistons you change the mix. The pistons might be 100% identical, but the dynamics involved with rotating masses are not based on linear calculations. Performance might increase, but at what cost? I'm not suggesting they'll cause a crank failure, but there are bound to be consequences, perhaps minor, perhaps not.