playahwitgame

im installing jackosn racing supercharger and the instruction say set the timing to 10 degress btdc. well isnt the marks on the c-shaft pulley only 14-18? how do i know when im at 10?

93supercoupe

use real engine managment and u wont have to worry about that dumb ****.

The only way ur going to make ANY power w/ that charger is w/ an Excellent tune.

playahwitgame

its not for my car. im installling it for somebody else.

22psicrx

get an adjustable timming light and set at 0 then move the light to 10 and adjust the dist. Is it going on a d series because its tough to tune , pings alot with normal amount of timming.

playahwitgame

it is on a d series actually

rmcdaniels

I just interpolated it the first time I installed one. You know where 14 is and where 0 is, so just go a bit less than a third of the way towards 0 from 14. 10 is actually pretty conservative anyway, they just want to make extra sure you don't blow your stuff up.

That said, pulling 6 degrees of base timing will make the car suck at part throttle, low RPM loads, like starting from a light on an uphill slope. The owner of the car will notice it and won't be happy about it.

If he's not ready to spring for real engine management yet, then the JR MAP Sensor Controller sells for $129 new from JR (or about $60 used on ebay) and gets rid of almost all of the problems with timing and fueling associated with the base JRSC engine management setup (pulling 6 degrees of base timing and putting a resistor on a relay attached to a Hobbs switch in line with the IAT). You still have to retard it by 2 degrees, but it's hardly noticeable and you can get rid of the resistor, plus it takes care of the tip-in fueling issue. The car will really drive like stock when he's not boosting and will smoothly transition to boost when he puts his foot down.

playahwitgame

i will let him know that for sure. thanks for the advice.