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Microtech S4 MT basemap being used on a S5 engine

Old 07-22-06, 11:57 PM
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S4 MT basemap being used on a S5 engine

Ok so i made a small fuckup on my order from a long time ago. I thought my engine was a S4 since it had a N332 18 881, yup a reman 87 turbo ecu. Reference taken here
http://www.rotaryresurrection.com/ro...older/ecu.html

pic of ecu if anyone cares
http://members.shaw.ca/ahyc84/FC3S/ecu.jpg

So with the 87 turbo ecu in the car and i found no noticible modification to the harness, i assumed it was a S4 engine and ordered a LT10 with the S4 basemap. I started questioning myself lately since I noticed other things on the engine itself that appeared to be S5, turns out the injectors were 195500-2020 meaning 89-91 turbo engine injectors...

Sooooo now i gotta make this work lol. Haven't fired the car up yet, on the final stages of wiring it in. Only problem I forsee right now is the injectors not firing right. Unless someone else have any more suggestion on problems?

Anyone have the basemap numbers for the S5 fuel map? I just need the car to be running to drive it down for dyno tuning.


the previousely owner knew absolutely nothing about the car as he just paid someone to put a turbo engine in it, typical ricer. So i was kinda stuck to figur everything out by myself. But hey, i got the car for dirt cheap. I couldn't even get a shell here for how much i paid for the running japanese turbo engine in a NA chassis
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Old 07-23-06, 02:51 AM
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Should not be any diffrence. I have an s5 longblock onto my S4 TII.
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Old 07-23-06, 03:14 AM
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and you don't run any fuel management?


the S4 injectors are low impedence, and the S5 injectors are high impedence. Should be a difference in injector pulse timing. Faster or slower, i couldn't say...
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Old 07-23-06, 09:31 AM
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The Microtech doesn't care between high and low impedance. From what I have seen, all the base maps are the same.

So you should be fine. You'll be changing all those stock pulsewidths anyway...
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Old 07-24-06, 01:49 AM
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Same

Originally Posted by ahyc84
and you don't run any fuel management?


the S4 injectors are low impedence, and the S5 injectors are high impedence. Should be a difference in injector pulse timing. Faster or slower, i couldn't say...

The fuel management is the MT?. I have tried the low and the high imp injectors. No diffrence. But make sure you do not mix I.E. primary using LOW IMP. And secondary using HIGH IMP. You either use all low imp or all high. My personal favorite is using all low imp. It gives better throttle responce. Good luck and keep us posted..
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Old 07-24-06, 09:26 PM
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oh wow that's nice to know

cuz i know some of the fuel management, i think it's the PFC that cares between the high\low impedence. Or maybe it was megasquirt
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Old 07-25-06, 02:30 PM
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Originally Posted by myfc3s
The fuel management is the MT?. I have tried the low and the high imp injectors. No diffrence. But make sure you do not mix I.E. primary using LOW IMP. And secondary using HIGH IMP. You either use all low imp or all high. My personal favorite is using all low imp. It gives better throttle responce. Good luck and keep us posted..
NOT TRUE, I'm using low's in the primary and High's in the secondary.....you just can't use 1 low and 1 high in the primary or 1 low and 1 high in the secondary.

both primarys must be the same and both secondarys must be the same but they don't all have to be the same.
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Old 07-28-06, 10:05 PM
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You're fine...wire it up.
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Old 07-29-06, 02:46 AM
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really?

Originally Posted by turbo80cid
NOT TRUE, I'm using low's in the primary and High's in the secondary.....you just can't use 1 low and 1 high in the primary or 1 low and 1 high in the secondary.

both primarys must be the same and both secondarys must be the same but they don't all have to be the same.

Thats nice to know. Thanks for the info, thats some new news to me.
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