Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

L-98 injector fire sequence

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Old 10-13-2006, 06:27 PM
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Default L-98 injector fire sequence

I know that the L-98 is batch fire but does anyone know what cyl. injectors fire together?
Old 10-13-2006, 07:00 PM
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I think it fires one bank at a time(right,then left) Anyone else? Its been a while since i've owned a tpi car.
Old 10-14-2006, 09:58 AM
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ttt..
Old 10-14-2006, 02:57 PM
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They all fire at the same time.
Old 10-14-2006, 08:00 PM
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they cant all fire at the same time? the timing from the 1st cyl to fire to the last would be too far off
Old 10-15-2006, 11:48 AM
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it fires bank to bank. left side, right side, left side, right side, and repeat. i THINK the very last year was sequential. i think.
Old 10-17-2006, 01:03 PM
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to my knowlege they are only bank to bank
Old 10-21-2006, 08:21 AM
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Pretty sure it's bank to bank!
Old 10-21-2006, 04:03 PM
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Bank to Bank...never was sequential.
Old 10-21-2006, 09:05 PM
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Originally Posted by 98_blk_Hawk
they cant all fire at the same time? the timing from the 1st cyl to fire to the last would be too far off
And therein lies the reason why TPI sucks compared to SEFI

It basically works like a Carb, the cylinders just pull in the available fuel when the intake valve opens. There's no premeasured amount of fuel for each cylinder, or timing for the injectors to open on each specific cylinder.
Old 10-31-2006, 11:32 AM
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Originally Posted by TransAminal
And therein lies the reason why TPI sucks compared to SEFI

It basically works like a Carb, the cylinders just pull in the available fuel when the intake valve opens. There's no premeasured amount of fuel for each cylinder, or timing for the injectors to open on each specific cylinder.
There really isnt much difference bank vs SEFI. SEFI only helps at idle and low RPMs, once you got WOT SEFI is pretty much batch fire.
Old 10-31-2006, 01:13 PM
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Inside the ECM, the injector drivers are wired together. It's 8 all at once batch fire. That includes the 85, 86-89, and 90-92 ECMs.
Old 10-31-2006, 09:45 PM
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All 8 fire at the same time as was said by the above post.
Old 11-01-2006, 09:40 PM
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Originally Posted by BULLET99Z28
I think it fires one bank at a time(right,then left) Anyone else? Its been a while since i've owned a tpi car.
Ya, 1,3,5,7, then 2,4,6,8.



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