Benifit of tuning after headers are installed - ZR-1 Net Registry Forums

boostedmaxPSI · 12-04-2012

After months of waiting for some headers to be made I decided a different route and purchased some SW with high flow cats and thermal coating.

I plan on doing the install ( wish me luck or advice, I'll take both )

My question is: what is the value and typical gain from getting the car tuned after my headers are installed?

Thx
FS

ZZZZZR1 · 12-04-2012

Quote:

Originally Posted by boostedmaxPSI

After months of waiting for some headers to be made I decided a different route and purchased some SW with high flow cats and thermal coating.

I plan on doing the install ( wish me luck or advice, I'll take both )

My question is: what is the value and typical gain from getting the car tuned after my headers are installed?

Thx
FS

Frank

Congrats!!!!

Expect 20 to 25 rwhp with headers. (A little less with cats)

David

Paul Workman · 12-04-2012

Not knowing your AFR ratio at WOT before installing headers is rolling the dice a bit. I experienced a suprise lean condition at WOT when I first bought the car. So, I'd at least have Marc or someone burn you a chip calibrated for an additional 25 hp - just to be on the safe side.

As for realizing max potential, a dyno session is probably the only way you'll know if you're getting the most out of the system. I'd make a point of getting it tuned soon as possible after you install the headers.

P.

boostedmaxPSI · 12-04-2012

Thanks for the replies.

Seems my question was a bit confusing.

I am Interested in understanding how critical it is to retune my car after the headers are installed. Most cars come from the factory on the rich side... I was curious if the headers leaned it out a bit and still be on the safe side or now it's too lean hence the need for a retune.

Is it possible to just send my chip off for a reburn to account for the headers or should I go thru another Dyno tune session?

Thanks
FS

XfireZ51 · 12-04-2012

Not getting your tune right after a header install can invoke Knock Retard due to a lean condiiton depending on state of tune . So you won't see the full benefit of better exhaust since the ECM will be dialing back the timing a bit. Part throttle also needs tweaking to optimize for the change in backpressure.

PhillipsLT5 · 12-04-2012

Marc can burn you a "generic" header chip with any other mods, but a dyno session will put you closer to max potential

12-04-2012	#1
boostedmaxPSI Join Date: Apr 2012 Location: TEXAS Posts: 171	Benifit of tuning after headers are installed After months of waiting for some headers to be made I decided a different route and purchased some SW with high flow cats and thermal coating. I plan on doing the install ( wish me luck or advice, I'll take both ) My question is: what is the value and typical gain from getting the car tuned after my headers are installed? Thx FS __________________ 1966 Mustang GT tribute 1988 Callaway Twin Turbo Aerobody (FOR SALE pm me for more info) 1991 Callaway CR1 SuperNatural 475 Aerobody 1992 Callaway SuperNatural 435 Aerobody (sold) For Sale:

12-04-2012	#3
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Benifit of tuning after headers are installed Not knowing your AFR ratio at WOT before installing headers is rolling the dice a bit. I experienced a suprise lean condition at WOT when I first bought the car. So, I'd at least have Marc or someone burn you a chip calibrated for an additional 25 hp - just to be on the safe side. As for realizing max potential, a dyno session is probably the only way you'll know if you're getting the most out of the system. I'd make a point of getting it tuned soon as possible after you install the headers. P. __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry

12-04-2012	#4
boostedmaxPSI Join Date: Apr 2012 Location: TEXAS Posts: 171	Re: Benifit of tuning after headers are installed Thanks for the replies. Seems my question was a bit confusing. I am Interested in understanding how critical it is to retune my car after the headers are installed. Most cars come from the factory on the rich side... I was curious if the headers leaned it out a bit and still be on the safe side or now it's too lean hence the need for a retune. Is it possible to just send my chip off for a reburn to account for the headers or should I go thru another Dyno tune session? Thanks FS __________________ 1966 Mustang GT tribute 1988 Callaway Twin Turbo Aerobody (FOR SALE pm me for more info) 1991 Callaway CR1 SuperNatural 475 Aerobody 1992 Callaway SuperNatural 435 Aerobody (sold) For Sale:

12-04-2012	#5
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,696	Re: Benifit of tuning after headers are installed Not getting your tune right after a header install can invoke Knock Retard due to a lean condiiton depending on state of tune . So you won't see the full benefit of better exhaust since the ECM will be dialing back the timing a bit. Part throttle also needs tweaking to optimize for the change in backpressure. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

12-04-2012	#6
PhillipsLT5 Join Date: Aug 2005 Location: Scottsdale, AZ Posts: 2,450	Re: Benifit of tuning after headers are installed Marc can burn you a "generic" header chip with any other mods, but a dyno session will put you closer to max potential