The other night I went out with my wife and some friends to the movies. My friend was driving behind us on I-95. I was on 6th gear going about 70mph. I downshifted into 4th from 6th and took the Z to 7200rpm. Anyways my friend said that he heard a pop and a flash of fire from the exhaust. Is it normal for the HR to do that at high rpm or am I running rich?

 

back fire.......mine has never done that but I have seen another HR do it at high rpm

 

My exhaust backfires almost everytime I shift (when I am in the lower gears of course). It makes all kinds of pop chicka bang bangs. I like, it makes it sound aggressive.

I have never seen a stock exhaust pop chicka bang bang, neither a Nismo for your matter.

 

check your oil... plugs... what octane are you running?

 

Oil was just changed last month. I have 4100 miles. Been using Penzoil 5w30 full Synthetic. Car drives excellent since the first day i bought it with 12miles. As far as gas 93 octane shell.

 

just 4,100 miles??? I think that's a bit harsh to rev that high before breaking the car in.

 

Why? isn't the break in period over after 1200 miles?

 

for some reason i was thinking it was more... i haven't gotten much sleep lol

 

LOL It probably sounds that way because of your Berk HFC's?

 

Damm dont drive your Z around if you havent slept well.

 

LOL... i know... working early in the morning with 5 hours sleep and driving back home in heavy traffic doesn't me very well

 

Dude it's 10:35 and I'm exhausted but as soon as I read "pop chicka bang bang", I knew EXACTLY what you were talking about and laughed my *** off! THANK YOU!

 

That sucks man. But you gotta do what you gotta do.

 

Correct.

Another member also has the same setup and he has the same little backfires. I really do like the exhaust note much better now that I got the HFC's.

As for break-in periods, I remember getting my brothers RX8 back in 05 (I hate the car BTW), and the first day he got it he revved the cream cheese outta that engine! Redlining to 9k every time after launching at stoplights. Today with him having well over 75,000 miles on the odo, he has not had a single issue, except for developing water condensation inside his left taillight.

Just food for thought.

 

Check out the sound clip of my Nismo exhaust.Let me know what you guys think?

http://www.youtube.com/watch?v=cjfWucE7D7Y

 

Yeah, that's what I tought The break in period has come in gone. How's your Berk HFC's? Have you had any issues Like CEL's? I had ordered a set for my car a while back but, returned them because, The stealership claimed that it would void my warrenty. I know it's bullsh!t but I did'nt want to take that chance. I know that Berk makes a good damm product. Is it true that our stock cats have good flow and when you replace them with HFC's your numbers on the dyno go down a bit?

 

Zero issues. Zero CEL's.

Lose power? Void warranty? As far as warranty goes, I doubt these will void the warranty. I don't know where you're getting your information, but these cats make excellent power dude. I remember seeing a dyno on a stock Z and it showed a good increase in power through all rpm's. For reference, there's a member on here, user name: WalkerT, who has the same exact setup like me and dyno'd 284whp. I think those are fantastic numbers.

At the end of this video you can see the dyno graph and Berk Technology gives the results at the end:

http://www.youtube.com/watch?v=MF2JXqzVcfM

 

HRs do run rich stock...

and my car pops like a **** when the RPMs are high and I depress the clutch and the revs drop.. love it though. Never knew of or seen the backfire.

 

I believe you that the HFC's make some power. But, I got my info from some older threads. They just never made any sense to me. I would have put them on my car if it wasnt because of my service advisors big trap.

 

I think if your exhaust is popping your getting the fuel burning at night. Then its true that the HR runs rich like a mother****er. I seen the exhaust pop at night on my friends RX-7TT it looks sweet. He also runs pretty rich though.