Help 91 Random Tech or Magnaflow cats Part number - Page 5 - ZR-1 Net Registry Forums

Hammer · 10-30-2009

GC, any better, I.e. straight on pics of those conections. I'd like to see a little more detail of them if possible.

Thanks

GOLDCYLON · 10-30-2009

No I dont have any and Im still working in LA, Currently at Morro Bay CA on a Dredge survey

-=Jeff=- · 10-30-2009

Are the the ends of the Magnaflow Cats 3" OD or 3" ID?

Jagdpanzer · 10-30-2009

Quote:

Originally Posted by -=Jeff=-

Are the the ends of the Magnaflow Cats 3" OD or 3" ID?

3" ID

Kb7tif · 11-03-2009

Hope they work out.

Hammer · 02-19-2010

Ressurection.

Did you have the car tested? What was the outcome? DEQ is starting an emissions testing program here and I will need to have cats installed I'm pretty sure.

Thanks

GOLDCYLON · 02-19-2010

Yes I did and it failed miserably we use the IM-240 test out here not just a sniffer so a moron driving the car that cant shift can really tube the test. I Ended up registering the car at my house up in Flagstaff so problem resolved for now. I went with the MFs but I'm not sold the RTs will solve the problem. My engine has a lot of miles on it now so im sure that is part of the problem as well. At least I am running cats so I dont feel like a gross polluter

tomtom72 · 02-19-2010

Just a fwiw on the low restriction/high performance cats.

I think part of the issue could be that the MF's or R/T's or any other of those type cat do not hold enough heat to work properly. They are made of a s/s alloy mostly and not just plain old steel. Stainless transfers heat too quickly vs aluminum/ steel alloy like the OEM cats.

I had an e-mail conversation with two different "coating" houses, and they both made the suggestion of coating the outside of low restriction/high performance cats with the same stuff that is used to coat the headers for thermal retention. Obviously, this conversation took place with respect to having headers and a smog legal exhaust system that would pass the tail pipe emissions limits.

Just thought I'd throw that out for your consideration.

Tom

GOLDCYLON · 02-19-2010

Quote:

Originally Posted by tomtom72

Just a fwiw on the low restriction/high performance cats.

I think part of the issue could be that the MF's or R/T's or any other of those type cat do not hold enough heat to work properly. They are made of a s/s alloy mostly and not just plain old steel. Stainless transfers heat too quickly vs aluminum/ steel alloy like the OEM cats.

I had an e-mail conversation with two different "coating" houses, and they both made the suggestion of coating the outside of low restriction/high performance cats with the same stuff that is used to coat the headers for thermal retention. Obviously, this conversation took place with respect to having headers and a smog legal exhaust system that would pass the tail pipe emissions limits.

Just thought I'd throw that out for your consideration.

Tom

I believe this is a strong possibility Tom. I deliberately reved the dog snot out of my car for about 30 mins to make sure she was good and hot and the numbers improved in the emissions test. Still did not pass. They are so close to the head pipes of the headers that I can?t believe they don?t get hot enough. But it?s a possibility

02-19-2010

You will have trouble passing the IM240 test with factory manifolds as well.

I just rolled a 94 through emissions up in Washington with the Magnaflow cats and had no issues. Another 368 as well. The cats are up to snuff, just the ZR-1 was never designed for the 240 test.

10-30-2009	#41
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,652	Re: Help 91 Random Tech or Magnaflow cats Part number GC, any better, I.e. straight on pics of those conections. I'd like to see a little more detail of them if possible. Thanks __________________ [I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I]

10-30-2009	#42
GOLDCYLON Join Date: May 2007 Location: Peoria, AZ Posts: 9,147	Re: Help 91 Random Tech or Magnaflow cats Part number No I dont have any and Im still working in LA, Currently at Morro Bay CA on a Dredge survey __________________ GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V

10-30-2009	#43
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,179	Re: Help 91 Random Tech or Magnaflow cats Part number Are the the ends of the Magnaflow Cats 3" OD or 3" ID? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978

11-03-2009	#45
Kb7tif Join Date: May 2009 Location: S Nevada Posts: 352	Re: Help 91 Random Tech or Magnaflow cats Part number Hope they work out. __________________ 1995 Convertible Supercharged Auto 1974 454 550hp (avatar car) On the blocks- -Scharger install ! 1992-Zr-1 Sold. Watson Headers Ported Plenum, Housings Random tech cats Fidanza Flywheel Chipped, Relocated Mat Woods 165 stat Borlas, Straights 1996 Lt4 Sold 1994 Lt1 Sold 2004 Z06 Sold AKA** Illenema

02-19-2010	#46
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,652	Re: Help 91 Random Tech or Magnaflow cats Part number Ressurection. Did you have the car tested? What was the outcome? DEQ is starting an emissions testing program here and I will need to have cats installed I'm pretty sure. Thanks __________________ [I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I]

02-19-2010	#48
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,637	Re: Help 91 Random Tech or Magnaflow cats Part number Just a fwiw on the low restriction/high performance cats. I think part of the issue could be that the MF's or R/T's or any other of those type cat do not hold enough heat to work properly. They are made of a s/s alloy mostly and not just plain old steel. Stainless transfers heat too quickly vs aluminum/ steel alloy like the OEM cats. I had an e-mail conversation with two different "coating" houses, and they both made the suggestion of coating the outside of low restriction/high performance cats with the same stuff that is used to coat the headers for thermal retention. Obviously, this conversation took place with respect to having headers and a smog legal exhaust system that would pass the tail pipe emissions limits. Just thought I'd throw that out for your consideration. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

02-19-2010	#50
Jeffvette Guest Posts: n/a	Re: Help 91 Random Tech or Magnaflow cats Part number You will have trouble passing the IM240 test with factory manifolds as well. I just rolled a 94 through emissions up in Washington with the Magnaflow cats and had no issues. Another 368 as well. The cats are up to snuff, just the ZR-1 was never designed for the 240 test.