Thank you very much for publishing your results. I think the next thing I would like to see is a legal drag race between the stock and modified smarts. The time slips should reveal what happens in an actual driving situation. Irwindale Raceway has 1/8mile drags every Thursday evening. It would also be good to run the vehicles at the same time on the same strip. Comparing time slips between manual vs. automatic shift should would also be interesting.
A smart, being that it is a 3cyl actually runs on 1.5ppr ( not the 3ppr that you would think ) The dyno jet is not capable of acurrately reading the 1.5ppr. We tried even doing 6ppr and printing out the results but if you take those figures and divide them by 4 it totally wasnt meshing with what the tach was reading on both cars, and we didn't want to post something that wasnt true.
I understand the dilemma you are writing about but I'm just curious if the charts that were run at 6ppr look accurate if you were to reduce the rpm by half. I'm just hoping for a chance that we can see charts that have HP and TQ during a rpm increase with hopefully less spiking that I am much more used to seeing and working with. thanks.
the spikes that you are seeing are because when you roll something at a certain speed, to get it to read a higher inertia the vehicle turning the roller has to "catch up" to the speed of the roller.
So what you are saying is the spikes are an artifact induced by the test setup and are not actually part of the power curve yet you use the "peak" of the spike as peak power numbers.
Quote:
Originally Posted by Padawan
Remove the spikes after each shift, and the remap-only generates about the same peak as stock. The intake and filter push the peak to roughly 70 whp.
Pete, honestly I dont know. I mean I bought the DTH header, the DTH exhaust, cold air intake, K&N filter, and remap and wound up with almost the exact same HP as Jeremy's car. My torque was alot higher at about 12ft lbs higher than his, but I don't know what caused that if it was the header, the intake or both combined. I would say that the ECU upgrade would be the best bang for the buck, because when I put on the DTH header and was supposed to get around 10hp more JUST from the header, and then we dyno'd both cars and I didn't AND THE WORST PART OF ALL I got the modified exhaust ticket, all in all the exhaust side of it wasn't worth it. Just the ECU remap gave us the same HP and you dont have to worry about the cops hasleing you for such a loud car. Those of you who have heard / seen my car, know that you can hear it well over a mile away. For not getting any extra HP just noise out of it, I would lean more towards the Remap.
smart bob, what time do they run cars at irwendale? and how much does it cost? if its cheap and not during work hours i wouldnt mind running mine againt a stone stock smart to see what the numbers are. plus cisco and i are trying to get some accurate 0-60 times too.
fastturb, no when we ran the 6ppr, it came out really blotchy... instead of having a solid blue line across a graph it would be blue for about an inch, the just disapear, then blue again and so on so there were big missing chunks as if the dyno wasnt able to even read it. i emailed dyno tech directly by the way, and told them about this issue, not sure if it will get solved, because the whole dyno is really desinged for v8's, race cars, and a hand full of 4 and 6 cyl motors. being that the smart is a one off on their ppr i doubt it will get very far. i dont know how much is intaled into them changing their software but if they decide to i'd love to run them again to see myself.
If the STOCK graph is 4th gear, then we're really talking 64/66/68 HP discounting the clutch slip/roller inertia peaks on the bottom two graphs.
The good part is the low end where the gear engages after a shift - 51/56/56
Mid-range looks like - 60/64/65
If the STOCK graph is 5th, you went backwards.
rz
The ECU remap has shown to be the most bang for your buck. We have spent quite a bit of time to get these results. Many people may interpret the graphs differently than others but the result either way is a big improvement.
Also, our customer Jeremy, who let us use his car for these results noticed the power difference immediately. He had a lot of time to really test it out since his trip home was pretty far.
What's next? Well, we can't just leave you with a Dyno result where power and torque are measured in a static environment. We are taking the cars to the track to measure some 0-60 improvement times. Right now, we don't know what to expect. This car really is not a "race" car but since no one has gone as far as we did when it comes to testing for the remap, we will complete our tests by showing our 0-60 test results. All we can say is, Stay Tuned.
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2008 Smart 451 Coupe
Lilly's smartcar
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