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View Full Version : twin turbo 415 sbc timing


bonedaddy
08-10-2011, 07:44 PM
sorry wrong place to post

msdtech1955
08-11-2011, 06:47 AM
what was it you were looking for ?

bonedaddy
08-16-2011, 09:12 AM
timing for a twin turbo sbc starting line and finish line just some place to start

msdtech1955
08-16-2011, 10:26 AM
whats your combo?

bonedaddy
08-24-2011, 10:51 AM
whats your combo?
415 sbc/ brodix track1 heads/all forged /blow through csu carb/twin 67mm turbos/ATI turbo3speed with a brake 4000 stall./9in 3.50 gear on a spool/comp everything 645/645 lift with 249/249 dur at 50 on a 115. hdy roller.good to 7200./ 3600 lbs on a 275 tire /msd 7562 boost controler and a 7535 with boost retard some help on using the 2 controller at the same time would be nice i have co2 to control the top of the wastegate as you sugested in post .all the help i can get would be great right now i have the 2 lite blue wired to my roll control and the dark blue on both on the trans brake HELP!!!!

msdtech1955
08-24-2011, 11:02 AM
is this gas or alcohol...?

on the boost controller ...is it plumbed like this ?
http://www.msdignition.com/forum/showthread.php?t=16933

what boost are we looking at ?
co-2 pressure ?
launch rpm ?

basically....tell me what you have done so far ..the more info you give me...the better we can help you on the timing and the boost controller curve!

bonedaddy
08-24-2011, 06:30 PM
waste gate is set up like duel waste gate 1 jpg

compression is 8.98.1
20 psi boost for now
gas 110 and water/meth injection.
2 precision 46mm wastegates
i am looking to launch at 4000 10in converter

ok now the rest of the story this is a new motor and all new setup for me !!

the old motor stock block stroker 396 same carb blow through 2 60-1 turbos
made 870 to the rear wheels on a dyno at 18 psi
2 evalation waste gates ran on 10lb springs only no controler locked down timing at 28 a dig 6 msd box msd coil msd billit dis.
no trans brake foot brake
it was sad 10.0 at 145 1/4 mile
so all this setup is new to me that is why i am being a PIA
all this new stuff its hard to know were to start !!!!!! just so you know i am not some young guy talking crap old guy working on bucket list LOL low 9s

msdtech1955
08-25-2011, 04:24 PM
are you running the 75psig racepak sensor or the three bar map sensor?
also, are you monitoring pressure at the manifold or waster gate?

bonedaddy
08-26-2011, 09:02 AM
map sensor 23121 on both boxes .this part is good to 30 psi ? i dont plain on going over 20 psi at this time . and at the manifold.

msdtech21
09-07-2011, 08:17 AM
Try pulling a total of 10* of boost retard using the 7535. Set the boost controller with 60 psi of CO2 on top of the gate. Start with P= 30 I= 15 D= 0. Plot your boost curve and let that dog eat.

bonedaddy
09-08-2011, 10:25 AM
Thanks i will let you know what happens

bonedaddy
09-09-2011, 12:28 PM
do i need to to add 14.7 for the map sensor on the boost retard curve on the 7535? I see nothing in the instructions to do so

I had to do it on the boost psi curve on the 7562

thanks

msdtech21
09-12-2011, 07:17 AM
do i need to to add 14.7 for the map sensor on the boost retard curve on the 7535? I see nothing in the instructions to do so

I had to do it on the boost psi curve on the 7562

thanks

Yes you need to add in barometric pressure. The best way to figure it out is to turn the ignition on without starting the engine. Connect the laptop to the MSD Digital 7. The red line in the Boost retard curve will move somewhere between 12.5-14.75psi depending on altitude. This would be your zero point if you were looking at a mechanical boost gauge.

bonedaddy
09-16-2011, 10:48 AM
first this is a blow through take the hose to the map sensor before or after the carb? and is this map right 20 psi take out 10* ?

msdtech21
09-20-2011, 10:27 AM
first this is a blow through take the hose to the map sensor before or after the carb? and is this map right 20 psi take out 10* ?

Just T it off of the boost gauge. That'll solve your plumbing question. And yes that is right on the boost retard curve.