rudebwoy

I got lucky on honda-tech classifieds yesterday, I bought a msd btm almost new for $75, but now I'm hearing negatives about using it with the hack, does anyone have experience on that? I'm also using a msd 6a ignition with external coil, along with the hack. so any negatives and positives input I really would like to know if there will be any issues with these.

RENR

im using the btm with the hack at 10-11psi and guess what? its still set to 0degrees of retard. im might need to turn it up though once boost goes up.

rudebwoy

why do you have it hooked up you dont need it? 1 think you should do at least 1 psi per lb.

RENR

hell no at 1 degree of retard its hella gay and slow. i installed it thinking i would need it but the afc alone works great. 1 degree is too much. if you start to ping under boost using the afc, just add more fuel with it. my settings (450cc, walbro pump)
1k -46
2k -46
3k-45
4k -40
4500 = -36
same up to 9k -36.
works just great and timing at dist is also stock.if you dont plan to go past 10psi u dont even need the btm.
oh i start to add fuel around 4k because my turbo doesnt really start to spool till 4k. so u might try adding fuel earlier in the rpm range depending on your turbo.

rudebwoy

I had problems with my earlier setup,(timing) I think, b16a using a d16 p28, I have a chip install to raise the rev limit for the b16a,which I beleived also raised my timing, cause it felt stronger on stock motor with the chip. running with the afc hack at 6 psi everytime I hit vtec it would lost power before engagement and launch when the vtec comes,I end up blowing up the engine on 10 psi, broken ring lands,melted one piston. so now I rebuilt the motor with all the good ---- 9.1 compression, still stock sleeves, still using the hack, but now I want to have all the backup so I dont have to worry about it I might even add a 4.1 fmu for backup+btm at 1 degrees

BlinD

Im on like .33 or so retard per lb on 8psi.

Reddy

With the BTM you should be advancing your timing to get a faster spool than using the BTM to take the timing out

TurboEF9

..you're kidding, right? Every BTM I have seen is constructed for retarding of timing only. I've yet to see one advance timing "per psi". And if it does, that is the most ridiculous device to put into use on a force inducted setup.

Think about this. Say your spark is set to pop at 2.3 degrees at 9psi (based on your ECU's ignition map), and 7400 rpms. Add this to your static timing (assuming stock), you'll spark at 18.3 degrees BTDC.

We use your "Advance BTM", which would advance per psi of manifold pressure, set to say, .5 (one half of a degree per psi). (.5 advance * 9 psi) + 16 static = 22.8 degrees, BTDC, rather than the 11.5 degrees it would be when retarding (as BTM is meant to do)... ..got ring lands?

fastcivicboy

lol mother ****** is smart! just listen to turboef9 he seems to know what hes talking about.

rudebwoy

advance timing for forced induction is a no go! the btm I know that advance timing only do it under vacuum. not under boost its the new btm with vacuum advance.