Ideas on smog issues with Zs. - ZR-1 Net Registry Forums

cuisinartvette · 06-03-2016

Esp in Ca most cant pass anymore
Hib posted some interesting info about tweaking the tune some
Random thoughts

1-Dummy cam where only 1 intake valve can open/tune to suit?
2-Repop orig exhaust manis, so a late model GM truck/vette or HD cat could weld on? Shorty header with smog tubes-perhaps old cats just dont get it done like the 3 stage (term?) do. Seems to be less hassle more cost effective long term. FWIW an aftermarket cat (on my 02 5.3) puts out more emissions than a GM and they dont last.

Other suggestions? Has to be a way around this rather than making "smog" cams too much work and $ to be changing that out
Cant help but think if the airspeed was picked up wiht the right work/valve job in the head port and cam done to suit has to make it more efficient

Was a project been wanting to do forever...not convinced its the cure but pretty confident theres more power and efficiency to be had out of these without having a rumpity idle. Have the perfect person to join in this one
Finding the parts affordable to work with another story. Grinds in mind and unlimited access to a bench to measure port speed etc.
Anyone got an old head and 4 cams they wanna part with in the name of hackery?

Other idears?
Cant bring myself to chop up a brand new one.

06-03-2016	#1
cuisinartvette Join Date: Aug 2005 Location: San Fernando Valley, CA. Posts: 896	Ideas on smog issues with Zs. Esp in Ca most cant pass anymore Hib posted some interesting info about tweaking the tune some Random thoughts 1-Dummy cam where only 1 intake valve can open/tune to suit? 2-Repop orig exhaust manis, so a late model GM truck/vette or HD cat could weld on? Shorty header with smog tubes-perhaps old cats just dont get it done like the 3 stage (term?) do. Seems to be less hassle more cost effective long term. FWIW an aftermarket cat (on my 02 5.3) puts out more emissions than a GM and they dont last. Other suggestions? Has to be a way around this rather than making "smog" cams too much work and $ to be changing that out Cant help but think if the airspeed was picked up wiht the right work/valve job in the head port and cam done to suit has to make it more efficient Was a project been wanting to do forever...not convinced its the cure but pretty confident theres more power and efficiency to be had out of these without having a rumpity idle. Have the perfect person to join in this one Finding the parts affordable to work with another story. Grinds in mind and unlimited access to a bench to measure port speed etc. Anyone got an old head and 4 cams they wanna part with in the name of hackery? Other idears? Cant bring myself to chop up a brand new one. __________________ 1990 ZR1, 142,000 miles-Black on black 4.09's Haibeck chip, 3"exh, K&N, meth inj. Last edited by cuisinartvette; 06-03-2016 at 01:07 PM.