HCI2000SS

iTrader: (2)

Just recently learned about this idea, and have done a little research as well. So one of my questions is can I just get any 90 mm TB (or even a used one like off a GTO for example) instead of the $400 ones that TPIS sells or other places like that? Apparently TPIS does the mod for $350, but the TB is like $400. So for like $750 it doesn't sound so great, but if I can get a 90 mm TB for say like maybe $150 or so then it seems much more attractive. So what do you guys think? Thanks

smg267

iTrader: (23)

My understanding is that they just cut the snout off the LS6 and mate it with a 90mm snout from a donor intake. I would believe that the mounting pattern for 90mm+ are the same for throttle bodies. Fast, NW, Ebay etc... all are interchangeable on Fast and GM 90mm+ intakes.

kinglt-1

iTrader: (26)

just sell the LS6 and get a ported fast.

HCI2000SS

iTrader: (2)

Thanks for the input guys! After more research it appears the "main argument" behind this idea is that it's not so much that the LS6 runners are not very capable as it is the opening to the intake. It seems up to around 6300 rpm that this is comparable to a Fast intake (with the Fast having only a slight edge in the last few hundred rpm) and maybe even a tad better down lower. How true it is well...I'm just not sure lol.

thunderstruck507

iTrader: (18)

The Fast gets it's gains through plenum volume and runner shape. If it was the 90mm part that mattered the LS2 intake wouldn't make less power than a ls6 stock for stock.

IMO the TPIS mod is a waste. You sell your ls6 for $350-400 (plus whatever you want for the TB) and put the $350 you would spend on the conversion with it and if you can't find a used Fast for that, you aren't looking hard enough. I've seen several sell for $500-600 and you would have more than that in your budget. Aren't they going for like $850 new now with some of the site sponsors here?

Either way you need a TB. It's unfortunate that Ballistic Speed went out of business, I have theirs and it is a good piece at a lower price.

Just my $.02, I'm sick so if I flawed my logic in there somewhere sorry but I think that's the reason you see so few TPIS intakes. Just doesn't make sense to me in the long run.

thunderstruck507

iTrader: (18)

Fast 92mm $450 (steal of a deal): https://ls1tech.com/forums/parts-cla...-nw-102-a.html

Fast 90mm $700 shipped (it will sell for less): https://ls1tech.com/forums/parts-cla...mm-intake.html

Fast 78mm with tb $650 (still better deal than a TPIS ls6): https://ls1tech.com/forums/parts-cla...onnectors.html

Fast 78mm $550 (he wants an ls6...trade him yours): https://ls1tech.com/forums/parts-cla...78-intake.html

I would think any one of those is a better deal overall for resale value alone. The Fast 78s even work with your stock tb as is or can be ported to work with 85mm tb (usually cheaper than 90mms).

HCI2000SS

iTrader: (2)

Thanks for the posts Thunderstruck! You make some solid points and no doubt "if" I can sell my LS6 intake and TB for a fair price then the cost for a used Fast and TB is the best possible scenario and I'd say that's the best route to go for sure! And yes the tpis work alone is $350 and if you buy a TB through them it's around $400...equaling roughly $750 at that point. For me the hardest part might be getting someone to actually buy my LS6 intake at a fair price (buddy of mine has been trying to sell his for over a year now) and finding someone that i'd trust enough to buy a used Fast from. I've been burned a few times in this area so it's hard to get over lol.

Any idea who sells the best priced 90 mm TB and Fast now? Ideally a good used one would be great.

thunderstruck507

iTrader: (18)

Sell the ls6 here or on Ebay. There is one ending in 10 hours for $380 and $40 shipping with reserve not met that has 5 bidders.

I've never seen an ls6 on our local craigslist last more than a few hours if it was priced right. They sell for $350-400 plus shipping. Asking any more than that and people will be looking at BBK or Fast instakes instead. They used to sell for $300-350 but the number of ls swap cars has driven the price up a tad.


Texas Speed has Fast 92mm on sale: https://www.texas-speed.com/p-3822-f...old-black.aspx

SCott5

iTrader: (40)

https://ls1tech.com/forums/generatio...-ls6-fast.html

I am sure you have seen this thread and assuming thats where you got your info from.

And the last FAST is mine and I went that route because I had room to grow with it. Buy it as a 78 and bolt it right on with all factory stuff and it does outflow a ls6 a little bit. But then the option of putting a fast 90 top shell on it or port it out to 85mm for down the road made it my choice.

SCott5

iTrader: (40)

The problem with ls2 isn't the opening it's the runners.

HCI2000SS

iTrader: (2)

Yeah my buddy has his listed at $350 IIRC. Say I did actually sell mine at that price, then a new Fast/TB combo at roughly $1250, equaling about $900 out of pocket. At that point it's about $150 more to do the Fast over the tpis LS6. And in all reality what's an extra $150 at that point lol. I'm kinda thinking i'm going to scratch the tpis idea and just be a little more patient and go for a Fast...maybe used or maybe not

thunderstruck507

iTrader: (18)

That was my point. People assume the Fast gains over an LS6 because it's 90mm (and also assume they need a bigger lid and MAF).

The Fast is both taller and sits close to the valley= more plenum volume
The Fast has a better runner design and ability to be ported over the LS6

The neck has less to do with it than those things. I would run a stock unported Fast 78mm over a TPIS 90mm LS6.

HCI2000SS

iTrader: (2)

Now I'd love to see a comparison between a stock Fast 78 vs a tpis LS6. If the 78 is truly better, then buying a 92 for the extra $150 is really a no brainer at that point IMO!

kinglt-1

iTrader: (26)

I just bought a Fast 92 with Nick Williams 92 Tb for 1140.00 Shipped from a site sponsor. I can sell my LS6 and ported TB for 500.00 easy, That puts me at 640.00. More then enough reason to stay away from the TPIS setup. Not to mention the difference in power. Being you have a 370 it would be a no brainer imo...the LS6 is holding you back I bet 20whp easy.

SCott5

iTrader: (40)

If staying NA and spray I would go fast 92/102

If plan on boost sometime in near future I'm not seeing where the tpis mod would hurt you.

How much gain does a FAST 92 have over a 90?

thunderstruck507

iTrader: (18)

None to my knowledge. It was a design revision for other things I believe.

redbird555

iTrader: (14)

i would to the fast route. I sold my ls6 with tb/rails injectors. I got 675 for mine on eBay. People on there pay a lot more than here as the price I got wasn't out of the norm. I think on eBay you could easily get 500+ for yours with the tb. Then pickup a 92 and do a direct swap. I did a 102 on mine and it ended up costing me 300 out of pocket for my new tb.

I didn't include tuning there because I do my own and with you, you would need a new tune with the ported ls6 or fast so that's a moot point. Get the fast

HCI2000SS

iTrader: (2)

Tuning is free for me as well so that's not an issue. I can't believe how much these LS6 intakes are going for. I didn't think they were worth that much I guess. Little did I know apparently lol. You guys have convinced me to save for the Fast. It makes much more sense when you factor it all in

SCott5

iTrader: (40)

Well this changes things kinda. IF there are no gains between a FAST 90 and a 92 and the tpis made more power than the fast 90, why not go tpis?

Scoggin Dickey

iTrader: (34)

Our 92mm TBs can be had for $369 shipped