demetaktak

hi.
i am running on stock OEM spark plugs, which show no need of change once removed but i really think i could use colder ones.

so, my car dynoed 465 WHP with only a tune! then i changed the stock sc pulley to 78mm, giving me 0,91 bar boost. stock boost was 0.75 bar. haven't dynoed the car but i know for a fact that it has a lot more power and is hell of a lot faster. for comparison:
on stock 465 whp, i had a run against stage x bmw 135 and we were side to side until 230kph, only pulled on him after that. then the 135 installed meth kit, gained ridiculous power (race tested) and after my pulley install i took off right away at 80 kph.

anyway, please give me insight if i shouldget one or 2 step colder spark plugs and if so, which do you recommend...

cheers

C32owner

That seems strong for a tune only car. Which tune you have loaded?

draggbody

every bolt on possible with stock blower usually doesnt net 600whp, a pulley and tune definitely isnt going to make that... someone is probably manipulating the dyno for big numbers to satisfy the customer if you know what i mean... i would say if you need to replace the plugs, one step colder, otherwise id leave them alone...

dchl21

lol don't think you do need it. and wow 465whp with just tune

demetaktak

the numbers seem about right comparing to what cars i raced and gave a run for their money.for example e63 w212 performance package was long gone in the mirror, and i know for a fact that that car was healthy.
it was a custom tune from germany. local dealer had it done.
any spark plugs specifically?

James M

Your numbers seem a bit high and if you are racing 135's then something is very wrong with your figures. With only headers and upgraded I/C pump I am able to routinely hammer the 135i JB4 and 335i JB4. The race is over in first gear and by second gear I have 2 car lengths on them - by third it's bus lengths. I think you might have been quoted estimated flywheel hp and not rwhp?

Exotic-metal55

General rule of thumb, for every 75 hp you add, you go one heat range colder.

cnterline

What's it run at the track ? Forget about the dyno sheet
For example my car dyno numbers were 506 rwhp on a mainline dyno
ET 10.88 at 129 plus ,there are Guys claiming a lot more hp then me running a lot slower ,see my point,I have one range colder plug
03 SL55

demetaktak

every time i went to drag race, the timer was malfunctioning and being in georgia, we have only one track and you cant just go as you please to see your time.
the 135 i raced was jb5, on meth and boltons, interior taken apart for weight saving and it was pumpin around 550 hp at the flywheel.
another comparison: this e63 dynoed 552 hp to the flywheel the night before the race...
https://www.facebook.com/video.php?v...type=3&theater

95ONE

What was the MPH?

demetaktak

120-122