oldschool

iTrader: (1)

Hello,

I'm in the process of building a pretty serious (for the street) 383 LT1 and would like to know if, or how much HP my stock WS6 ram air CAI w/k&n filter and BBK 52mm tb will be costing me.

Here are the specs of the build:
383 with 11.6 to 1 compression (run on 91 octain)
24x LS conversion
LE fully ported 23 deg Trick Flow heads
237/245 .603/.616 110 LSA LE cam
Ported intake
Pacesetter long tubes and Mufflex 3.5" catback
Forged rotating assembly - 6" rod and -5cc piston
All supporting bolt ons and higher end valve train

Amy ideas? Trying to avoid spending anymore money since I've gone FAR past my original budget. Thanks...

DUDCOUPE

To me the tb is small, i dont care what people say but the more air you can take in and exhale the more power youll make. Gonna need bigger headers too.

HCI2000SS

iTrader: (2)

At this point it probably will be a bit of a restriction, but i'm willing to bet that you're not going to gain much either

oldschool

iTrader: (1)

Thanks guys - anyother opinions? Any before and after rwhp gains after swapping these 2 components?

BALLSS

OP

Ask Lloyd his opinion.

IMHO, the 52 vs the 58 would be a minimal gain. I think you could spend your $ elsewhere......didn't see injectors on your list

robmnrd

I will second asking Lloyd what he says. But fwiw when I was planning my build with Lloyd (my build in sig is considerably less aggressive than yours) he said that a 58mm tb, ported intake, large diameter headers/very free flowing exhaust would basically all add up to ~5ish hp at peak, and power being carried higher and further past peak (potentially 10 at the very upper rpms). Some people can't justify the cost of parts/torque band shift for that little bit of power up top, but I was in a position where I was okay with it and would have good parts to grow into if I wanted to go bigger/more aggressive down the road.

oldschool

iTrader: (1)

Yes...Lloyd suggests a larger TB, LS air lid and 1 7/8" headers for my set up. I respect his opinion, just want to know how much it would hold me back if I decided to leave it until I have the time to do it right. I can live with 10 hp (which is what it sounds like) - if it was 15-20+ HP, I'd probably just go a head and do the TB/CAI now. I'd buy some bigger headers if LPP would ever email me back (too cheap to buy the kooks)

robmnrd

Honestly if it was me I would probably have an all-or-nothing mentality in your situation. I probably wouldn't bother doing just the tb, or just the tb and the LS lid. I'd either stick with what you already have, or I'd find the funds and go all out with the lid, tb, 1 7/8" headers and a post-header exhaust setup that at least included a cut-out. Probably not the best way to look at it, since some is better than none, but I'm only human. lol.

bowtienut

iTrader: (1)

Are your Pacesetter's 1-3/4"? If so, keep them.
1-7/8" are only going to get you that last 5 peak hp on the dyno. You MIGHT even see less hp under the curve with them.
1-3/4" LT's are supporting 600 hp NA motors just fine.
You can save money by not porting the intake. Stock intake, with only the front bores opened up for the 58mm TB is good for 450 at the tires.
52 mm TB is not a show stopper, and you'll never feel the difference, but it will probably give up 10 hp and a tenth at the dragstrip compared to a 58mm.

oldschool

iTrader: (1)

Thanks guys...what do you think about the stock WS6 air box with the fins cut out and K&N filter? Restriction at this point?

Puck

iTrader: (17)

No, WS6 ram airbox is just as good or better then most aftermarket CAIs.

sweetbmxrider

iTrader: (13)

From what I read on the internet, the stock is more of a restriction than a 52mm throttle body.

DUDCOUPE

From what ive gathered teh stock tb is good up to 1000hp and flows ova 850cfm

Double06

Maybe something is wrong with the dyno? Most guys with an automatic 454/460 ls NA motors are struggling to get to 550 foot pounds at 5000 rpm this is doing it at 2500 and then some. I have a 540 cubic inch Chevelle Turbo 400 does 525 foot pounds at 5000 rpm at the tire. My 454 LS stick car NA does 490 tq at the tire at 3,000 rpm and 550 at 5,000 rpm. It makes 610 rwhp with a ported 90 mm TB on pump gas. I realize this is an auto but there are plenty of good auto examples of what this engine should do an this is not one of them. I think something could be wrong with the dyno. Try and find a 454/460 NA street car dyno sheet where the engine make 600 foot pounds at the tire at 3,000 rpm. Maybe something weird going on with converter. If we look at an engine dynos most of these 454/460 ls engines are in the 610-630 tq at 5,000 rpm and maybe like low 500s at 3,000 rpm.

ElkySS

iTrader: (6)

Holy 7 year old thread, Batman!

BigDaddy97

This guy extended his 468's range by 350 rpm just by using an adapter to run a 112 throttlebody on his 105 intake. My HorsePower Research HPR 468 build - LS1TECH - Camaro and Firebird Forum Discussion