Camaropar

iTrader: (1)

Starting this because most threads about shortys seem to be about whether they're worth the $$$ or how much HP you can expect. What I'm asking is, has anyone just done a swap from manifolds to shortys and run their car afterwards.

Are they worth 0, 1, 2 mph?

This would be on a mostly stock bolt-on ls1 car, catback, lid, some kind of CAI.

I ask because I'm considering something like this on mine, which has true duals, SLP lid and CAI duct as the only mods. What could I expect?

Also, how restrtictive are the stock cats on the same bolt-on setup previously described? Are high flows worth anything?

I live in CA and need the car to pass smog, no under the table deals either... just a simple daily driver.

TImmy_Jones

iTrader: (4)

What year do you have? the 01 and 02 basically came with shorty headers, so spend the money elsewhere.

Out of curiosity, did you hook up the true duals to the factory manifolds and just cut the down section of the stock Y pipe?

I went with hi-flow cats, not sure how big the difference is, but the factory Y is just so restrictive.

Camaropar

iTrader: (1)

mines a 2000

I have a bassani setup that was pieced back together after it had been cut up (previous owners). Pretty much used none of the factory Y except for the flange sections that bolt to the cats.

jimmyblue

iTrader: (11)

'00 manifolds are same as '01-'02 except the EGR boss
has the bung for that plumbing, it's blind on the '01-'02.

I have a couple of sets of shorties in the shed. A set of
alleged "stainless" ones from eBay which rusted right up
without ever seeing the engine bay, and with really dumb
flanges that present a 1/2" hard lip to the collector tubing.
Nice. Probably worse than manifolds.

The JBAs actually look well made. They have a stubby little
velocity spike and the merge is clean through the flange.
They have less rust (bought used, unknown service life)
than the eBay turds.

I'll be taking the Jet-Hots off and putting the JBA, Mufflex
tubes, SLP Y combo on the car fairly soon. I'm looking to
get closed loop operation cleaner with the O2s being
closer / hotter, and I don't care about midrange torque
because I see 5000RPM as soon as I mat it. I don't think
going from 3" to 2.5" pipes before the Y merge is going to
cost me much, and the SLP Y actually has a decent merge
design where the Jet-Hot is pretty poor (and worse until
I hogged some 1/2" stick-in away).

Stock cats are very restrictive. Random Tech cats (from the
stock manifold compatible high-flow Y) are the same as
gutted cats. Pipe is better than either.

Camaropar

iTrader: (1)

Well I'd be going with edelbrocks for the CARB #... So no one has done a back to back 1/4 or 1/8 mile test?

Steve Gunn

I don't think you will see much of a gain, but it WILL sound nicer.

Back in the day, stock motor, Hooker shorties, stock cats, LS1 intake, ported TB, CAI, lid, cutout, underdrive pulley, stock gears, etc. with basic weight reductions the car went 12.7@112 w/2.0 60' on street tires. Sorry, no apples to apples "before" comparison. Just a lid and through the catback was 13.2@110.

Camaropar

iTrader: (1)

What does 'basic weight reductions' entail? I'd love to trap that... my 1/8th trap was only 82.5 tho...

Steve Gunn

Thanks!
The car is a "no options model" hardtop (lightest to begin with). I removed the spare, jack and backseat. It weighed 3240 without me and a quarter tank. And I lied... it was 111.99mph.

Bo White

iTrader: (59)

I done an Edelbrock shorty swap on my old 98 Z, dont know how this will apply to your car but here it is:

https://ls1tech.com/forums/generatio...aders-ory.html

paq

well my dad have edelbrock shorty with ory and cb plus a lid on is 98 ss and he trap the same mph than me (109 mph) with only a cb and fra on my 98 z28, both 6 speed, both hardtop on the same track the same day. same weight same 60 ft, almost same time (13.09 vs 13.13)

i don't know if he got a tune, he bought the car like that. no dyno sheet either

the only thing i like about is setup is
1-the sound! much better than stock manifold/cat
2-and no ground clearance problem!!!

Starz T/A 17

iTrader: (6)

I had a set of on old 2000 Trans Am and they do make the sound a lot better but the car ran the same times before and after the install. I would say go for it if you can get a set used for $200 or less, but I would never pay the price that they go for now, money can be spent elsewhere with better results. Another thing to think about is there are smaller cams that provide good gains that are created to work with the factory manifolds and cats. So if you went with something like that it would still pass inspection with better results

Camaropar

iTrader: (1)

Well mines the heaviest version, t-tops, RS model, 12 disc changer, stock steel driveshaft (wtf).... So I hate you .

Well we got a couple that say shortys do nothing, and one that claims a 2mph again (albeit with an ORY)... So maybe shorties and high flow cats are the ticket...

Frost

iTrader: (45)

No gain over stock manifolds for shorties... the 2-3rwhp you see on the dyno translates to basically nothing at the track. If you THINK you got a gain at the track, I would suggest you monitor the DA.