When do you need to upgrade a stock flywheel?

[Royal-T-Ltd]

to an SFI approved? or is it necessary?

just wondering b/c at the moment my tranny is out and dont want to do things twice if it can be avoided. Thanx

 

[BetMinesFaster]

When it cracks like mine!!!! Lol

 

[XLR8]

I think at 10.99 and faster to be NHRA legal. Or is that the balancer?

 

[MSDGN]

Both balancer and flywheel at 10.99 to be NHRA legal...

 

[Nick Micale]

Both balancer and flywheel at 10.99 to be NHRA legal...

If you are asking about an automatic transmission flexplate, last I checked the NHRA rule book, a SFI approved one is not required until 9.99 and faster in a full-bodied car?

 

[GNVYUS 1]

I regret not swapping mine out after the new motor so I say do it, they are cheap and will be much stronger than 20 year old metal ones.

 

[Royal-T-Ltd]

i was just checking b/c i saw an ad on EGAY for one and it stated that to be NHRA legal for 11.99 and faster you needed a SFI flexplate/flywheel... it seemed kinda slow to need it but thats why i posted.... here's the link:
eBay Motors: J&W Buick Turbo V6 Internal Balance FlexPlate Flywheel (item 160157330927 end time Sep-20-07 07:21:31 PDT) and Mike Licht is selling it so i figured it is good info and a good product. Let me know what ya think.

 

[cruzn57]

you need them for 9.99 and faster

Mike @ full throttle has them for under $60
SFI approved !! and yes there chinese, so what isn't?

 

[cruzn57]

you need them for 9.99 and faster

Mike @ full throttle has them for under $60
SFI approved !! and yes there chinese, so what isn't?

 

[MSDGN]

If you are asking about an automatic transmission flexplate, last I checked the NHRA rule book, a SFI approved one is not required until 9.99 and faster in a full-bodied car?

I always thought it was 10.99...has this changed recently or was the NHRA rule always 9.99?