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Microtech These injectors make sense?

Old 10-03-10, 04:58 PM
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These injectors make sense?

Hi Gang,
I'm working on geting my 10AE tuned/modified correctly and today got definite info on the injectors.

Here's the engine particulars:

Atkins rebuild with port & polish
Racing Beat Rev TII exhaust
Microtech LTX12 ECU
MSD Blaster SS Ignition coils

The injectors are:

RC 750cc Primary
Denso 550cc Secondary

Adding LC-1 wideband while on this week's project.

So, the question is; do these injectors make sense to get maximum performance out of the mods so far?


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Old 10-04-10, 06:08 AM
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No. You never run secondaries that are smaller then the primaries.
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Old 10-04-10, 09:23 AM
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aside from the worsened injector fidelity and subsequent rougher idle with worse economy and response
having the injectors larger in the primary position than the secondary will have little ultimate bearing on the running of the the engine after staging has occurred

post staging all injectors will have dropped to the same pulse width and hence the engine is receiving the same fuel either way
their position may have some bearing on injection phase timing at higher rpms due to most engines having limited timing window on the primary inlet

i would expect staging threshold to be lifted so as to achieve better use of the larger primary flow,, expecting maybe 2 psi and 3500 staging against the -5 / 3000 norms with micro

when you setup the staging on a micro with larger primaries than secondaries,, your staging value will be less than 50%,, rather than the normal 50% +
( i would hazard that around 35-38% in that situ )

either that or you stick them back into the engine so that the primary is the 550 , and the secondary is 750
and you try a split around 62-65%
and this will win with an easier start and idle and a more predictable staging tune
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