Dyno day, Now with figures!!! |
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Dyno day, Now with figures!!! |
emerygt350 |
Nov 20 2021, 02:32 PM
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#1
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Advanced Member Group: Members Posts: 2,081 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Just got back from the Dyno. We were able to tune the mps reasonably well. Still have a little leanness at wot and lower rpms and richness at wot at high rpms but overall pretty smooth. Waiting to get the figures from the shop. If I remember right it was 77 horsepower and 105 lbs of torque at the wheels. I am running big 225/50r16s so I suspect I would pick up some more with lighter stock rims and tires....
I will post the graphs as soon as I get them. |
Van B |
Nov 24 2021, 09:33 PM
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#2
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Senior Member Group: Members Posts: 1,582 Joined: 20-October 21 From: Maryland Member No.: 26,011 Region Association: None |
@JamesM these are WOT. Part throttle will be much richer.
@emerygt350 I know I’m a 914 newb, but I’m no stranger to tuning for performance… granted most of my experience is from my days racing superbikes, the principle is the same. A motor is basically an air pump. And what I see is that your big pistons are drawing a lot of air down low, but as engine speed picks up, Bernoulli is your limit. Some combination of valves (size and lift), ports, or even intake runners are not able to let enough air through. And also, your fuel is not mapped to match the air that is being drawn in. Also, torque will fall off even as HP climbs. Horsepower is a made up number after all. (Torque*RPM)/5252 = Pretty Ponies. My advice is not to obsess. The potential of your engine is not much more than where you are currently. And that last little bit you’re talking about are the most expensive horses you can buy! I would focus on refinement and drivability: flow match intake, exhaust, get a hot coil for fun. And then maybe lighter wheels, etc. You got a real cool car man, I’m impressed with it! |
JamesM |
Nov 25 2021, 10:22 AM
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#3
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Senior Member Group: Members Posts: 1,894 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
WOT is really where you need to worry about heat the most as that is where the motor is the most stressed. I have seen 100deg differences in head temps on a type 4 just from dropping the WOT AFRs from 13.7 down to 12.3 across the board. |
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