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Old 02-18-2019, 06:30 AM   #11 (permalink)
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I've been part of Aygo forums since 2008. Had mine for 10years/250.000km. They are pretty much dead all of them.
But let's not discuss that any further

The car will firstly be set up to a short burst acceleration. If proven worthy I'll take it for a spin in fwd NA streetlegal class dragrace.

Later perhaps trackday. 165 55 R14 Nankang NS2R would most likely be perfect for that.

The car takes on HP nicely. Airfilter proven to add 3-5hp depending how low the trmp get. And bigger diameter exhaust lets off 6hp in peak range. Tje ignition timing is set to be able to run with the worlds worst fuel.

Underneath could use som straighten out, no covers whatsoever. Only doubt Ihad was the smooth underbody vs lowering.

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Old 02-18-2019, 10:00 AM   #12 (permalink)
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I have a friend who does circuit races with the BYD F0, which is basically an Aygo clone featuring the variable valve motor.

Easy to get it to handle, but not much you can do that will make a dent in the performance difference to bigger-engined small cars like the Mirage. Though if you do get 100 hp out of the motor, that would be fantastic.

Before significant ride height or undertray modifications, you might want to look at creating an airdam for the same effect without compromising suspension stroke.

Doubt you can get 6s 0-100 with 100 hp. Maybe with around 130. Target weight of about 560 kg, given the frontal area, maybe you can get 7s. Depends on gearing and torque. But it will be fun to see how fast it can go.
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Old 02-18-2019, 10:32 AM   #13 (permalink)
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The 1krfe engine has proven to make 90-95hp, just by exhaust, open filter and a tune.and the engine is willing to take 8000rpm without failure. So with optimal flow along with lighten flyweel the power band could be extended as it drops afye 6k rpm. 6s might not be achieved. The goal was originally sub 7s. Which I believe in. Being light and with small wheels I can really shave alot of weight off the wheels compared to heavier car with same p/w ratio. A 300hp/1400kg Golf would easily be +20kg to get any decent grip. And lower friction due to narrow tyres as grip will be less of a problem. Looking at other cars with similar p/w ratio 6-7s is not far
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Old 02-18-2019, 10:42 AM   #14 (permalink)
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Reports of our death have been greatly exaggerated.

I'm off to class now so I'll come back to this later and write more, but this is a simple physics problem. My hunch is that the answer will be physically or financially unworkable, though, if you're looking for a car that does 0-100 kph in 6 s on 100 hp.
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Old 02-18-2019, 11:12 AM   #15 (permalink)
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Honda Integra 4.gen p/w ratio 6.3. 0-60mph 5.8. 0-100 is 6.3 because of 2. Gear not reaching 100km/h. Will be about the same p/w, 2.gear +100km/h, 4-5kg lighter wheels, low friction/narrow tyres. 100hp was also just a goal, which I'm sure I'll go beyond. I cant be far off but time will tell.

A stock Aygo will do 0-100 in about 12.5-13s messured with a 20hz gps called Draggy, which is as close to true figures as it gets.
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Old 02-18-2019, 01:31 PM   #16 (permalink)
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How would you feel about dragging around a 3ft boat tail? Given that it has more plan taper above the wheel arches it would have an upper and lower section like this:

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Old 02-19-2019, 01:34 AM   #17 (permalink)
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Have you never considered something similar to the eAssist/BAS-Hybrid system instead of getting totally rid of the alternator?
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Old 02-19-2019, 12:25 PM   #18 (permalink)
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I did, but I figure that it'll be cheaper and easier to just make a cutout switch so the alternator freeruns when full throttle.

So the I'll get an electric water pump and freespin alternator, that should set of a few HP I might have too high hopes, but I hope for atleast 10-12hp which would be a great gain Sets hope for 120+ hp.

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Old 02-19-2019, 01:50 PM   #19 (permalink)
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How about a boxed cavity?
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Old 02-20-2019, 04:46 AM   #20 (permalink)
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Quote:
Originally Posted by JohnnyJerry View Post
Honda Integra 4.gen p/w ratio 6.3. 0-60mph 5.8. 0-100 is 6.3 because of 2. Gear not reaching 100km/h. Will be about the same p/w, 2.gear +100km/h, 4-5kg lighter wheels, low friction/narrow tyres. 100hp was also just a goal, which I'm sure I'll go beyond. I cant be far off but time will tell.

A stock Aygo will do 0-100 in about 12.5-13s messured with a 20hz gps called Draggy, which is as close to true figures as it gets.
12.5 sounds reasonable. The Mirage 1.2 with 74 hp but less weight and more torque does it in around 11.8. (Garmin GLO, 10Hz via RaceChrono... I've V-Boxed the car, but with a passenger, and it was at 12.5 then. Weight really does a number on these small cars!)

100 bhp and seven seconds might be a very big ask. We did some development work on the Mirage engine when my friend was still in the country, and on these small motors, with basic bolt-ons and an ECU tune (no redline work), we found some 10 hp with a chip and bolt-ons. Granted, with an aggressive tune and the redline raised, you might eke out another few hp, depending on how under-rated the stock motor is and how restrictive the stock exhaust is. (have any links to what modified KRs are doing there? I have friends who'd be interested)... I guess your ceiling is higher, as the KR probably isn't as optimized for low rpm use as the 3A92... which could really use a bigger throttle and more cam.

The electric pump and alt-delete won't gain you as much as on bigger cars. Smaller accessories, smaller draw. Flywheel will help responsiveness, but not much more. I guesstimate you'd gain maybe 3-5 hp for your trouble de-accessorizing the engine.

But then, I'm not familiar with modifying the KR-FE, but say you can hit 100 hp, you still need Super Seven levels of lightness and grip to hit the 7's. So yes, you need to be below 600 kg. Stock weight of the Aygo is around 860+ kg, don't know where you're going to find much in savings past the first fifty or sixty. Full interior strip on one of these cars should net you maybe an extra second off the 100 km/h times, but past 60 km/h or so, at these power levels, it's all aero.

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