PONTIAC SLP

iTrader: (3)

Hi , like it says , i'm not trying to lie or anything but this what happened and i'm very pleased with the results , same jets with previous tune and timing did't changed anything only i installed POWERBOND underdrive pulley and NGK BR7EFS plugs instead of TR6 , the car pulled 596RWHP 584TQ and car still rich i should change the fuel jets and i believe it will hit +600RWHP , timing set 20 degree.

this is the old dyno run with TR6 and without pulleyhttps://ls1tech.com/forums/dynamomet...ms4-chime.html

i'll try today to post the graph as soon i get the graph from the tuner

Updated Post #29

venom ws7

iTrader: (13)

The highest gains I've see in my life from UDP Are you sure the tuner didnt add some timing with TR7???

or maybe a cam swap
LOL

MABROOOOOK We need some new vids and post the graph please.

PONTIAC SLP

iTrader: (3)

me too , yeah i'm fully sure he did't changed anything and did't swapped the cam with another cam .

allah ybarek feek , today i'll post the graph and here you're the video

http://www.youtube.com/watch?v=47jRLcKcAwA

fly pantera

iTrader: (9)

bottle psi can make a big difference,maybe that was it

PONTIAC SLP

iTrader: (3)

Pressure is the same as before.

allngn_c5

iTrader: (3)

Very interesting. I was going to comment on bottle pressure too but you say its the same. Good job.

PONTIAC SLP

iTrader: (3)

I called the tuner today he said tomorrow he will print the graph.

JS01

iTrader: (10)

What up with the grey smoke at the end.

PONTIAC SLP

iTrader: (3)

dunno.

RJB01camaross

Thats a big gain for just a pulley. I think on my LS1 I got 6hp & 11tq with a ASP pulley

ethomp

Just curious, are there any adjustments you have to make after installing an underdrive pulley....tune or anything, or just bolt on and go?

Bader-X

iTrader: (2)

sine the spark plugs were alsochanged I think maybe a spark plug had a bent tip or damaged or a spark wire not connected properly .... seen it before ... this is the explanation I can come with for the +50 tq gain.

slmawi

well done mohammed huge number for just a pulley change!

may be new spark add some number?! huge number for just udp

keep it up fraind

losiguy

iTrader: (7)

You did not gain that much power from a underdrive pulley. The bottle PSI was higher, the A/F was leaner, you were detonating before with the TR6's, something to that nature. A underdrive pulley does not give nearly that much power..lol.

zacht

iTrader: (18)

also, did you remember to put the belt back on too? lol, seems to be pretty high for such a slight mod. i would have to say something was messed up on your dyno numbers before the swap, either way, you have it fixed now!

PONTIAC SLP

iTrader: (3)

i did't make any adjustments , just like i said at the beginning in this thread.
maybe spark plugs did gained this results because sponsors at Nitrous section recommend me to run with TR7 plugs for 100-200HP because TR6s for 75 shoot.
maybe !! thanks much brother
just i said and this the third time i'll say again , the bottle pressure is the same , A/F is rich , maybe TR6 not responding nitrous as well .
the car runs very perfect with TR6 and i raced many fast cars and no problems on there .

slayerized6

iTrader: (12)

my guess for the huge gain is the fact that your were pushing 550+hp before the UD ulley. your freeing up a higher % of hp

9secondsflat

sorry....dont buy it...u/d 10rwhp tops...seen several hundred b4 and after swaps...over the past 20+ yrs..

99TransAmLS16Spd

iTrader: (8)

Maybe the stock balancer was bad? Creating harmonics that caused the pcm to pull timing? Or one of the many other reasons people have already listed.

Black02SS

iTrader: (36)

What did it gain from the swap of the pulley without the nitrous. That is what I would be wondering. N/A to N/A. Too many variables in nitrous IMO for true consistency.