BTM yes or no.....

[Florida240sx]

I have a btm in my room waiting to be installed. But should I use it, or just retard my base. I'll be running 10lbs with maybe a little bump up to 12 in a couple weeks and might level it off at 15lbs. Should I retard of base or use the btm?also being it will retard as soon as it sees boost it will start to retard. Help me out here guys I'm confused.At 15lbs .5retard over 8lbs that would be 3.5 retard which I could do off base... but btm I would have set about halfway @.2-.3 to acheive same results........

[dj_hype]

from NemeGuero on KA-T.org:"yah, you can retard your base timing at the distributor for low boost.. but it'll affect your low-end and idle timing. IE, your car will idle rough and because you dont have ideal ignition timing for non-boosted conditions, you wont be running as efficient as possible when not in boost. leading to power loss.

The BTM uses vacuum to decide when to retard timing, so it'll only retard it when you are under boosted loads, thus solving the above problem

keep it"

In your case, def. use it. In mine, seeing as I only want to run 8 psi, its optional but recommended. However you want to do it.

[koukiKA240]

aww cmon dont want it anymore

but yea DJ covered it.~Sam

[WDRacing]

I have the MSD BTM, works very well. I have it set for daily driving at just under 1 degree per lb of boost. Just for the hot Arizona weather. Anything over a degree and it was pulling to much timing and the car would lose alot of power.

WD

[nissanfanatic]

If you have it already, just use it. One of the biggest differences is off boost driving. No laggyness under normal conditions. NTM this is way easier to tune than adjusting base timing.

[sunnys14]

retarding about 3 degrees shouldnt be too noticable when driving off boost.

[dj_hype]

retarding about 3 degrees shouldnt be too noticable when driving off boost.

yeah but he wants to boost around 10-12psi and on up to 15psi. I can see 3 degrees for 6-8psi but any more psi and you need more degrees which will be more noticable under off-boost conditions. Since he already has a BTM, id say go throught the pain in the *** it is to hook it up and use it. Also, if you don't want to do the JWT dizzy mod for the s14 dizzys, switch to s13 dizzy or, i read about something about a piece that you could use from summit racing as an external trigger without having to do the JWT mod but it was on KA-T and I cant find the goddamn post!

[Florida240sx]

TY thanx guys. Only benefit I saw was being it will retard as boost comes on so more power until full boost.But how much I didn't know.JWT dizzy mod???

[dj_hype]

i think i read somewhere a while back that to be able to use the BTM on an S14, you needed to do the JWT Distributor mod because the BTM needs an external trigger to hook up to but I could be absolutely wrong so don't hold me to it.

[WDRacing]

Nope you're correct, But its pretty easy to do.