Ok, dual cats = more HP right? So can I do this to my car? If so how? Would I have to make it custom? Thanks!

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust
8.5mm MSD Ignition wires
TB Coolant bypass

Kills:

95 (****) Probe GT
94 4.6L Mustang
91 CRX (dont ask me why he raced me)
2nd Gen Z28 (350) haha to you V8 guys!
More to come

 

I dont think dual cats would increase HP if anythign it would give more back pressure also i think it only would work if you have dual exhaust.

 

I disagree. Dual cats will reduce the restriction...it got about 10 HP on the L98s when they offered both exhaust options.

But for a V6, a good high-flow 3" single cat would probably be just as effective at a much lower cost.

 

On a V6 exhaust, most of us have a Y-pipe to 1 cat to 1 muffler out in 2 tips right? Then how could tossing anohter cat converter in that series offer any benefit?

 

Brian, Monkie is not talking about having 2 cats in SERIES...he is talking about PARALLEL, like the later model SD L98s and TPI 305 G92 cars. They have one cat off of each bank of cylinders and a y-pipe AFTER the cats into a single intermediate pipe...or into individual duals.

I agree that having 2 cats in series would not be a good move for performance and questionable for emissions. I think that is the method used by cars in certain Eastern Europe for US export.

 

as far as a hp gain, dual cats on a single exhaust setup would be pointless..

 

Dude, it ain't. As Glenn said, it gave 10 extra HP on a 305. Is it wise on a 3.1 though? I dunno...it might give ya an extra 5hp if it gives a 305 10.

At least its a better idea than gutting a cat...but I won't go there

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Jason E
'89 Camaro RS 2.8
Hypertech chip/K&N filters/Accel 8.8 wires,coil/RapidFires
Eclipse CD and 100x4 amp/Boston plates and 6x9s

JasonEE98 on AOL IM

 

Im glad SOME of you guys understand what I am talking about. For those guys who are lost I am talking about having the 2 cats BEFORE the Y pipe. And how is it stupid? What was it the IROCs that they did that to? And it gave them 10 HP. So how is it stupid? Anyways to you guys that understand would it be possible and a good idea? Thanks!

------------------
1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust
8.5mm MSD Ignition wires
TB Coolant bypass

Kills:

95 (****) Probe GT
94 Mustang GT
91 CRX (dont ask me why he raced me)
2nd Gen Z28 (350) haha to you V8 guys!
1992 RS 305 TBI (good race)
More to come

 

Oh i thoght you wanted 2 cats ehind eachother my bad.

 

you need to check the area of the pipes to see if its worth it. If the 2 pipes going into the single pipe have more area than the single pipe then its worth it.

On the dual cat v8 cars, 2 cats were on a 2.25" pipe each, and the single cat was on a single 2.75" pipe.
Area of two 2.25" pipes = 7.95 sq. in.
Area of single 2.75" pipe = 5.94 sq. in.

get it?

while I have the calculator out:
Area of single 3" pipe = 7.07 sq. in
dual 2.5" = 9.82
dual 2" = 6.28
single 3.5" = 9.62

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-Tas
'89 Formula WS-6
[soon to be Performace Red =) ]

305, TBI, auto, 14x3 chrome flat based open element with K&N, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz
ICQ 82881207

[This message has been edited by Tas (edited November 27, 2000).]

 

Tas is right...just remember though Monkie, doing a dual cat setup is pretty costly. I remember seeing aftermarket setups in "Next Generation Restoration and Performance Parts" for like $500 or so...you might be able to construct your own setup though with a pair of Catcos or something...not too sure.

IMO, do some ignition mods or something else first. It'd suck to spend a fair amount of time and money to do this and not get out what you're hoping. Remember, 305s and 350s gained 10hp from this, not V6s

If you want to build the ULTIMATE 6, then I'd say go for it...but only after you get some other stuff done 1st, like a 3.4 swap!

 

For the money it would cost, a gain would be minimal. More of a gain would be seen on a larger (V8) motor.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

Yea I think I will do the 3.4L maybe first.

------------------
1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust
8.5mm MSD Ignition wires
TB Coolant bypass

Kills:

95 (****) Probe GT
94 Mustang GT
91 CRX (dont ask me why he raced me)
2nd Gen Z28 (350) haha to you V8 guys!
1992 RS 305 TBI (good race)
More to come