2008 power steering conversion with motec

[machzrobbie]

Just finishing up converting a new to me 2008 Apex to power steering with motec ecu. Still have to finalize the rpm signal from the motec to the power steering ecu, but that will hopefully be done this week. I'm really happy with the way the sled turned out!!

 

[Macheater]

Fill us all in. How much cost. effort, time, parts, where involved? Oh ya, and extra weight?

 

[machzrobbie]

I had a complete 2011 sled that I stole the motor out of for my turbo sled so I took all the power steering stuff off it for this one, and parted out the rest of the stuff. I had to re wire the 2011 harness to make it work with the motec - removed exup and used the old style throttle bodies to get away from the electric idle motor. The claim is 18 HP with the Motec ECU natural aspirated @11,400 and I had Hurricane Dave port the head with his new porting which has shown good power so far this year - should make a good combination.

 

[scott32]

I had a complete 2011 sled that I stole the motor out of for my turbo sled so I took all the power steering stuff off it for this one, and parted out the rest of the stuff. I had to re wire the 2011 harness to make it work with the motec - removed exup and used the old style throttle bodies to get away from the electric idle motor. The claim is 18 HP with the Motec ECU natural aspirated @11,400 and I had Hurricane Dave port the head with his new porting which has shown good power so far this year - should make a good combination.

The power steering is kool, I'm more interested in the motec allowing you to spin up to 11,400. Daves claims are a peak power at 10300 on his stoker kit apex. Is your apex still stock bore and stroke? Is that 11,400 based on the limitations of the gear reduction ratio spinng the primary @9150. I'm curious as to changing the reduction ratio, as I've seen advertised, so 12,000 would turn out at 8350ish and by adding this extra reduction it should multiply the torque at the primary to allow more weight to be thrown at it for better belt grip and life. Then the motec could then be tuned for additional power? Thoughts?

 

[machzrobbie]

The power steering is kool, I'm more interested in the motec allowing you to spin up to 11,400. Daves claims are a peak power at 10300 on his stoker kit apex. Is your apex still stock bore and stroke? Is that 11,400 based on the limitations of the gear reduction ratio spinng the primary @9150. I'm curious as to changing the reduction ratio, as I've seen advertised, so 12,000 would turn out at 8350ish and by adding this extra reduction it should multiply the torque at the primary to allow more weight to be thrown at it for better belt grip and life. Then the motec could then be tuned for additional power? Thoughts?

My motor is stock bore, stock stroke, 2012 head with the larger exhaust ports and the new style exhaust - I'm trying to take the best of everything and put it together!. I also adjusted cam timing to optimize higher rpm. The rev limiter on the motec is set at 11,800 with dyno results on the older motor with stock head porting making the most power at 11,400. I'm hoping to get this on a dyno sometime soon to see what it does - I'm hoping for around 185 hp. We ran the motec on a turbo sled last winter and on the asphalt this summer and it love's to spin high 11's with the supreme tool clutch and stock gear reduction.

 

[scott32]

Thanks Rob, what compression ratio with head job and stock bore/stroke? Daves new head porting uses the 1.5mm larger intake ports as well. Assuming he's talking about the 2012 head. He's saying 200ish but thats also bored and stroked. It would be interesting how close you guys can get as I had questioned Dave about increasing the rpms and recieved very little input other than where his combo made the best power, which I respect but I believe a motec or vipec can unleash alittle more. Some guys using these ecu's are running some nice numbers with turbos on stock compression pump fuel. Did you order the motec through Precision, they seem reputable, or did Dave get it for you? I also saw you run in Grandbend this summer,I have some video on my phone and some pics too. I ment to get to the pits and chat but wife and kids have no interest for gearhead-chat, they just like to watch. I spent 15min with Dave and the kids were pulling my arms to get back and watch the cars. It makes it hard to really listen to someone, almost to the point of wasting your time so I didn't make the rounds. Next time they stay with the wife at the track.

 

[machzrobbie]

Dave said compression should be at just over 12:1. I have dealt with Martin from Precision on a couple Motec's over the past coupe years - built a Ski doo 1200 and Ernie's Apex with Motec controlling them, and now this one. He's been great to deal with but is very busy this time of year. I upgraded to the MCX 315 fuel box with injectors in the inter cooler last year on my turbo and have stuck with that and power commander for timing control. I'll move the motec to the turbo for the asphalt next summer for sure but wanted to try it N/A to see what I can do, and I really wanted to make sure I can get it to work with the power steering first.

 

[scott32]

So at 12:1 is pump fuel safe N/A and low boost up to 5lbs area correct. Does the tuning capabilities of the m400 allow you to run more boost safely at the close to stock compression?Are you running both STM clutches or just the primary? Maybe I'll just find out next summer at the Bend.Thanks for your time again, Scott. I hope it all works out.