06blackGTO

iTrader: (20)

Just curious, I went on the dyno that I always go on and I was down from 423 to 401hp. and 403 to 385 on tq. NA..the only thing diff. was I put in colder plugs. from tr55's to the br7ef for the nitrous. I had a speedshop guy tell me that I could lose around 15hp from the colder plugs. Is there any truth to that?

Speed Density

iTrader: (38)

You can be down on power due to a colder plug, it does make a difference. However arent the BR7's like a #6 heat rang plug? I doubt you'd be that much different from a 55 vs. BR7

BayAreaSS

iTrader: (10)

subscribing.... i've been wondering this samething lately

SargeZ06

Not according to the stickies.

LS1 Stock and AFR
Thread – 14mm
Reach - .708”
Socket – 5/8 hex
Seat - Taper
Stock Heat Range: 5
Gap: .060
Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Denso IT-16 (stock number 5325)


Nitrous (two steps colder)
Heat Range: 7
Gap: Consult
Plug: NGK BR7EF (stock number 3346); NGK TR7IX

Detoxx03

iTrader: (14)

Good question

gator's 99TA

iTrader: (2)

i have run 7 plugs and 55 plugs and noticed no difference in ET/MPH and my car dead hooks on motor.

Speed Density

iTrader: (38)

I #7 would make no difference either.

87silverbullet

iTrader: (11)

x2 on this one. Going from tr6 to br7ef, no change in et

BAKED

iTrader: (14)

My car makes pretty much the same with a 6 or an 11 on the dyno FWIW...

06blackGTO

iTrader: (20)

Okay thanks for the help guys, maybe the car was down on power because it was pretty humid and hot out compared to when I ran on the dyno last time. Or I have something else going on I need to check. Thanks again.

john563

iTrader: (17)

nitrous tune?(pulled timing)? were you on an N/A tune then redynoed on a nitroustune?

06blackGTO

iTrader: (20)

Well my tuner tuned it on the bottle at the track a few months ago, I have the timing tricker coming on when the selenoids kick on. So it does pull timing when the selenoids kick on, I remember he said the timing tricker was pulling out 8-9 degrees of timing when I run, so he lowered it thru the tune to pull 6 degrees and the power came up on the bottle. Does it still pull timing when the system isn't armed ?

02TransAm/Batmobile

iTrader: (32)

I swapped in BR7EF's before my Nitrous tune at Straightline Performance. He got my N/A tune dialed in and with jus a lid and cut-out I put down 343/361 (with 42 lbs/hr injectors for my 175 shot). Again, everything else was stock.

That's some pretty damn good numbers and doubt I will pick more with TR-55's.

BLK02WS6

iTrader: (2)

Sounds like you may have something going on with timing... why are you using the tricker and pulling timing in the tune? The purpose of the tricker is to allow you to not pull it in the tune... what he did does not make sense if you have it straight... you need some logs to see what the timing is doing when. That could explain your being down on power...

06blackGTO

iTrader: (20)

The tricker only kicks on when the selenoids kick on. So I don't believe it's pulling in the tune, when I ran a diablosport predator scanner, and when I ran na, I didn't see the iat temp rise to 199 degrees. then when I armed the system and ran it on the n20 on the street, I can see the iat tricker kick on. So I believe na, it's not kicking on, thus not pulling timing. I just remember when it would kick on at 1st, it was pulling alittle too much timing, so he went into the timing tables on efi live. and he lowered it down alittle when the tricker would kick on. I may be wrong, but I don't believe it's pulling timing on the na runs.