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Discussion Starter · #1 ·
I am going to be getting my 81 L28ET motor ready for the summer . I am going to run 14-17psi boost with a starion intercooler, MSD igntion, adj FPR, and larger fuel pump . I know that igntion must be retarted at higher boost levels otherwise preigntion will begin . The timing is set by adjusting the crankangle sensor . Not enough retard gives detonation, too much and lose power and EGT jumps as well . Anybody got any cheap was of changing timing as boost goes up and leaving initial settings alone . I know MSD has such a unit ???
 

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> I am going to be getting my 81 L28ET motor
> ready for the summer . I am going to run
> 14-17psi boost with a starion intercooler,
> MSD igntion, adj FPR, and larger fuel pump .
> I know that igntion must be retarted at
> higher boost levels otherwise preigntion
> will begin . The timing is set by adjusting
> the crankangle sensor . Not enough retard
> gives detonation, too much and lose power
> and EGT jumps as well . Anybody got any
> cheap was of changing timing as boost goes
> up and leaving initial settings alone . I
> know MSD has such a unit ???

Msd 6BTM has an automatic boost retard built in. you set it to pull either 1,2, or 3 degrees of timing out for every pound of boost. Probably the easiest and cheapest way to do it. Some of the newer ignition systems let you set your own timing curves, but the expense is too much. For the amount of money you are better off going with an SDS or TECII. Stick with the MSD 6BTM until you are ready to go aftermarket engine management.
greg
71 240z
 

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Besides MSD's BTM unit or 6BTM, jacobs makes one too.
I bought it for my NA to turbo conversion before I bought the ZXT I own right now (its been around 2 years) It is NEW in the box with instructions.
I got it from summit cheaper than directly to jacobs. I can let go for $150.

check it out at:
<A HREF=http://www.jacobselectronics.com/html/products/timing.htm>http://www.jacobselectronics.com/html/products/timing.htm</A>#boostmaster

> Msd 6BTM has an automatic boost retard built
> in. you set it to pull either 1,2, or 3
> degrees of timing out for every pound of
> boost. Probably the easiest and cheapest way
> to do it. Some of the newer ignition systems
> let you set your own timing curves, but the
> expense is too much. For the amount of money
> you are better off going with an SDS or
> TECII. Stick with the MSD 6BTM until you are
> ready to go aftermarket engine management.
> greg
> 71 240z
 

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Discussion Starter · #4 ·
> Besides MSD's BTM unit or 6BTM, jacobs makes
> one too.
> I bought it for my NA to turbo conversion
> before I bought the ZXT I own right now (its
> been around 2 years) It is NEW in the box
> with instructions.
> I got it from summit cheaper than directly
> to jacobs. I can let go for $150.

> check it out at:
>
> <A HREF=http://www.jacobselectronics.com/html/products/timing.htm>http://www.jacobselectronics.com/html/products/timing.htm</A>
> #boostmaster
Clint, I went with an SDS because I started from scratch with a ZXT swap into a Z and did not want to go through trial and error and thats basically what you will be doing. You are focusing on ignition timing/retard but what about fuel delivery? Would'nt it be nice to also build a fuel delivery curve? Experience says trial and error sometimes ending costing more, so do it right the first time and be done with it. Not only does a system like SDS give you programability, but it also eliminates the factory junk, including that horrible AFM. Before you conclude these systems are too expensive, know what you want and figure out what the alternative might cost.
 
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