Hi fellas. I have a bored & stroked 87 motor I'm installing in my 86.5 928s. Has anyone here done this before? Can you alert me to any obstacles? My main concern is that I would like to use the 87 induction system. Does anyone know how I can adapt my 86 intake electronics (i.e. sensors) to the 87 intake?
Thanks in advance, Hammer

 

Don't think that is an easy answer, two different systems. Be mucch easier to get a wiring harness for the '87 engine along with a set of '87 brains and go from there. The '87 uses knock sensors which you would want with a stroked engine.

 

The 87 motor uses the flappy valve, and it's related plumbing/wiring/computer control... though you could run w/o it but you would lose some low end.


Scott

 

WE did it and it was not easy. You need to rewire the CEL for the S4 and later wiringharness...basically, lay down the two wiring diagrams and begin matching functions and swapping connector locations.

We installed the S4 brains also...it worked like a charm and turned out 400 rwhp..flappy working and all.

Did the same for a GTS into a 83 euro...

Marc
DEVEK

 

good question... I'm ramping up to do the same thing on my 85, w/an 89 stroker...

don't forget the front harness too - the sensors are located in different places w/the different intakes...

mark, could you set it up/what parts would you need? ie already have the S4 harness/85 harness... would you need the CEL to ECU harness or is that a bugger to pull/best done in the car?

thx

 

Is that stroker a 6.0? Where did it come from? A black S4 by chance??

Marc
DEVEK

 

How long do these MM typically last?

My shark has 57k. What is the average when they really wear out? Or is there a test to see if they are shot. Pretty sure they are toast in my 83. For those who care anyway.

 

Go out and start your car. Pop the hood and rev the engine with the throttle linkage, if your motor rocks back and forth your mounts are probably still ok. If the engine doesn't rock back and forth they are toast and you have a lot of engine vibration transmitted through out your car. HTH

Yes we care! You should change them!!

 

my stroker came/is coming from my 85 block, 89 heads/etc... specs/details are on web page/signature link... can't imagine how you do more than 1 of these a year w/all the detail and custom stuff that goes into one of these... guess that's why you're the stroker king... any thoughts on what you'd need/want to do the re-mapping/connector change thing? sounds like you've BTDT enough to do it pretty fast/right the 1st time...

 

Hi Mark,
The engine is a 87 core that I modified (ported heads, 968 valves, g-force valve springs, Trick Titanium retainers, etc.). The stroker kit I bought from you a few years ago. (the premium kit)
I was thinking of transferring all sensors from the 86 intake to the 87 intake & fabbing up the throttle linkage. Feasible?
Hammer

 

Thanks Shane.

I saw that I posted this in the wrong thread. I read motor and my brilliant but dsylexic mind saw motor mounts. I go now, I here too long.