08-08-2014 | #61 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,699
|
Re: Thoughts on backfire?
Quote:
__________________
[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 |
|
08-09-2014 | #62 |
Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
|
Re: Thoughts on backfire?
roam the streets and find a stock zr-1 or even a C5-Z06 and you'll see what you got.
|
08-10-2014 | #63 |
Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
|
Re: Thoughts on backfire?
I had some time, so I pulled the mufflers off of one of my rigs, leaving the LT headers and about 3" of pipe after each collector.
I flash the PC with a calibration with the stock 4 seconds of DFCO engage timing. While driving I would release the throttle and count 4 seconds then "CRACK" a severe snap as the DFCO shut the injectors off. Then I reflashed with the DFCO timer set to 0.250ms(1/4 of a second) and it was almost comical, lift throttle "CRACK" on throttle, off throttle "CRACK". that lean snap as the fuel shuts off sure is loud. KS: I went from a stock 3.08 gear to a 4.10 gear and added a locker at the same time. After a short break in, I went out and romped on it and I was disappointed. I thought even with the 325/50/15 BFG drag radials I would have some traction issue, but no. Wit the 3.08's and 28" tire, trans in OD with the cruise control engaged, at 70mph climbing a mild grade on the highway would cause the throttle to open, torque converter to unlock, and sometimes a down shift to drive. After gear swap, same hill, speed etc. the cruise control would barely open the throttle while climping TC stayed locked, and trans stayed in OD. My trans OD is 0.70:1 vs the ZF's 0.75:1. I noticed the gears more during light driving than I did during performance street driving. The dragstrip is where I noticed both my gear swap, and subsequently my calibration/header/exhaust mods. The ET drop was substantial. My "butt-dyno" was also miscalibrated. I'm sure Marc will set you up. Goodluck.
__________________
peace Paul ZR-1 Net Registry Member #1494 |
08-10-2014 | #64 | |
Join Date: Feb 2014
Location: AZ
Posts: 860
|
Re: Thoughts on backfire?
Quote:
That's what I figured, too. I know the car is quicker, just can't "feel" it for some reason. Marc is great and I know we'll get this figured out sooner or later. |
|
|
|