December 2013 Fastrack

[Greg Amy]

the classificaton of the B18C5. Not quite sure why the 1" porting note has to be there. Is that not the rule for all STL builds?

Early (1997) Type R B18C5s were hand-ported from the factory. Subsequent B18C5s were subject to a CNC clearance process (something that typically may be part of a good IT/STL-level engine build anyway). The CRB would not approve (and I would not have supported) the engine if we allowed the factory porting in, since it would not be able to be scrutineered (what part was done by eunich ex-Ninja Shinto monks, and what was done by the competitor?)

That note is an exclamation/clarification that the ported B18C5 engine will not pass scrutiny in STL. Any porting work, factory or otherwise, is prohibited. If you've got a hand-ported '97, you'll need to either get one that is not ported and/or start with a replacement casting (e.g., B16A/A2/A3 head).

- Greg

[Ron Earp]

ITS
1. #11724 (Willie Phee) Classify Acura TSX in ITS
The CRB requests member feedback for this question. Please submit letters to crbscca.com. Should the 04-08 Acura TSX remain as currently classified in ITR at 2760 lbs or be moved to ITS at a weight of 3175 lbs?


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Bring it on into ITS with 205 stock hp @ 3175 lbs and some 15" wheels. Hoosier guys will love it.

[Chip42]

tGA - stupid (maybe?) question:

STL now has weight penalties (understandably) for certain engines, RWD/AWD, etc... are these applied successively, or are they summed before applying the cumulative % penalty over the chart?
e.g. the B18C5 has a 2% penalty. if RWD this would be chart *1.055*1.02 (1.0761)or *1.075?

at 1800cc this is 2430 chart, 2615 as successive, 2612 as summed.

I recognize it's 3lbs in this instance, but that's enough to get bounced at impound.

[JS154]

tGA - stupid (maybe?) question:

STL now has weight penalties (understandably) for certain engines, RWD/AWD, etc... are these applied successively, or are they summed before applying the cumulative % penalty over the chart?
e.g. the B18C5 has a 2% penalty. if RWD this would be chart *1.055*1.02 (1.0761)or *1.075?

at 1800cc this is 2430 chart, 2615 as successive, 2612 as summed.

I recognize it's 3lbs in this instance, but that's enough to get bounced at impound.

I believe any adjustments are each done as a percentage of base weight, then all added to the base weight.

[Greg Amy]

STL now has weight penalties (understandably) for certain engines, RWD/AWD, etc... are these applied successively, or are they summed before applying the cumulative % penalty over the chart?

I believe any adjustments are each done as a percentage of base weight, then all added to the base weight.

I would disagree, Eric. STx is an engine-centric category, and the engine weight is the baseline for everything. Additions for specific engines should be factored into that baseline. So IMO you'd tally up all the stuff for the engine, and that's now your new base weight for the chassis it's installed into.

Example: B18C5 Type R engine installed into an S2000 chassis. Engine is 1.8L so 2430 pounds. B18C5 get +2%, so 2479. Gets installed into a RWD S2000 chassis, so +5.5% over 2479, thus 2615#.

If there's reasonable disagreement in this, then it's something we should clarify/codify.

- GA

[Chip42]

don't wait for disagreement, codify it NOW before there's a problem. again, that problem is AT WORST 3 lbs with a 2% engine modifier but if this system becomes a more common practice, you could expect that delta to grow.

and as I said above, 3 lbs is enough to bump you at impound, and it's 3# higher the tGA way than the tEH way. just state the order of operations, and do that every time you add percent weight changes to other allowances.