bigblockguy

I was curious to know if anyone out there knew the cfm rating of the Fast 90mm TB, and do you think that this TB would be capable of supporting 700 HP naturally aspirated? I plan on using this TB in a custom EFI set up for a big block, and FAST's site doesnt really give me too much info, so I'm turning to you guys. Thanks in advance,
John

SUX2BU

iTrader: (14)

Stay as fasr away from that brand TB as you can. there are so many horror stories out there about it.

bigblockguy

any reccomended brand? What about the one from nick williams or TPIS? Do you think it will support these HP figures?
John

SouthFL.02.SS

After FAST 90mm TB frustrations (I had an early batch), I bought a TPIS and was very happy with it. They use stock (proven) components for the moveable parts, and have a nice housing. Worked great. Worth the money.
NW has had good reviews here also.

bigblockguy

thanks for the info, what problems were you guys having, and mostly, do you think it will support 700HP naturally aspirated?

SouthFL.02.SS

The TB blade used to sitck on the early batch FAST 90s due to slippage of the cam. The blade would also sometimes not clear. MAP sensor issues also.
I think they have all the bugs worked out by now.

Here's some pics of FAST vs. TPIS that I took with my cameraphone a while back. The spring on the TPIS is stock (big is good). FAST uses a tiny spring that needed to wound an extra turn for the TB to work.

FAST


TPIS

bigblockguy

wow, thanks for the pics! They help a bit. now what about the cfm, and will this TB support 700HP NA?
John

SouthFL.02.SS

^ Without going to a custom piece. 90mm is the largest available off the shelf that I know of.