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Old 07-04-2021, 03:51 PM   #411 (permalink)
It's all about Diesel
 
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Originally Posted by 19bonestock88 View Post
I still wanna use it at WOT though
Isn't it fitted with an electronic throttle plate? Can't you get a tune enabling the throttle plate to remain wide-open earlier and within a broader RPM band?

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Old 07-14-2021, 07:38 AM   #412 (permalink)
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The 03-04 Ions had a cable driven throttle, and simpler engine management than the later ones (no cam sensor, no MAF)
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Old 07-14-2021, 08:13 PM   #413 (permalink)
It's all about Diesel
 
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no cam sensor
Was its EFI still continuous-flow instead of sequential???
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Old 09-12-2021, 11:17 PM   #414 (permalink)
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Was its EFI still continuous-flow instead of sequential???
It has what was referred to as compression sense ignition, which uses ignition current to figure out which cylinder is firing and thus derive a cam position signal. Kinda neat.
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Old 09-12-2021, 11:36 PM   #415 (permalink)
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Going backward?

So, much of this build has been about the calm efficient “Dr. Jekyll”, and I wanted to showcase the “Mr. Hyde” portion too.

I changed wheel/tire setups temporarily for an event coming up at Tail of the Dragon, prioritizing lateral grip over efficiency. I had accumulated a set of 16x7” König Z-In which only weigh 15.5lb, and fitted a set of Firestone Firehawk Indy 500 tires in a 225/50-16. I lost around .75” of rolling diameter and gained 20mm in section width, likely over an inch of actual tread, these things are meaty. Given that I haven’t fitted the wheels with smooth covers I’ve caused some extra drag from that, and from the tire being wider. I also gained about 3lb per corner due to bigger wheels/wider tires.

That being said, the grip from these is incredible. I did lose around 12-15% on my highway mileage but on a twisty road there could potentially be mileage gains just from not having to slow down for corners. I feel now that I need a better seat and maybe a harness for holding me in place, but time will tell. Going back to my normal setup in a few weeks so my time of only getting ~40mpg highway is going to be short.
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Old 09-13-2021, 12:03 AM   #416 (permalink)
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....on a twisty road there could potentially be mileage gains just from not having to slow down for corners.
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Old 09-13-2021, 12:38 AM   #417 (permalink)
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Looks good, maybe you won’t melt the brakes since the wheels can breathe. Have fun, stay safe friend!
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Old 09-13-2021, 02:13 AM   #418 (permalink)
It's all about Diesel
 
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Quote:
Originally Posted by 19bonestock88 View Post
It has what was referred to as compression sense ignition, which uses ignition current to figure out which cylinder is firing and thus derive a cam position signal. Kinda neat.
I knew about knock sensors, but I'm not sure to which extent they could actually measure the actual compression within a cylinder.
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Old 09-13-2021, 07:11 AM   #419 (permalink)
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I knew about knock sensors, but I'm not sure to which extent they could actually measure the actual compression within a cylinder.
It makes the calculations based on the resistance across the coil. Given that it’s waste spark there will be an obvious difference in amperage from the coil that’s firing on compression versus the one firing on exhaust, and the ICM looks for that difference to generate the cam signal which allows sequential fuel injection
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Old 09-13-2021, 07:12 AM   #420 (permalink)
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Looks good, maybe you won’t melt the brakes since the wheels can breathe. Have fun, stay safe friend!
Brakes can breathe and there’s more grip so hopefully less need to brake

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