Headers , Exhaust and emisions in Colorado - ZR-1 Net Registry Forums

4-cam · 05-18-2014

Well I passed emmisions! With my previous chip I was not even close. Ported top end, secondaries removed, SW long tube headers, x pipe , magnaflow cats and 3 " exhaust was a bit to much change. I contacted Dominic and he had a tune from an earlier round of modifications on his car that was simular to mine. He made some minor changes for my application and first time thru it passed.
I think this really shows how good Dom 's tune was as he does not have to pass emissions in Chicago. I believe if the A/F ratio is kept in check thru out the rpm range thru a good tune , then emmisions should not be a problem with these modifications.
THANKS AGAIN DOMINIC.

05-18-2014	#21
4-cam Join Date: Feb 2010 Location: Arvada Colorado Posts: 194	Re: Headers , Exhaust and emisions in Colorado Well I passed emmisions! With my previous chip I was not even close. Ported top end, secondaries removed, SW long tube headers, x pipe , magnaflow cats and 3 " exhaust was a bit to much change. I contacted Dominic and he had a tune from an earlier round of modifications on his car that was simular to mine. He made some minor changes for my application and first time thru it passed. I think this really shows how good Dom 's tune was as he does not have to pass emissions in Chicago. I believe if the A/F ratio is kept in check thru out the rpm range thru a good tune , then emmisions should not be a problem with these modifications. THANKS AGAIN DOMINIC. __________________ [I]4-cam[/I] [I]1991 ZR-1 Blk/Gry #31[/I] [I]SW Headers/Xpipe- Dynomax Muffs[/I] [I]Ported top end[/I] [I]Secondaries Removed[/I] Tune by Dominic