Technical Punto Cabrio 1.2 16V on the dyno

[cauchemarre]

Hello everyone,

So I just came back from the dyno, and the results were astonishing, but not in a positive way lol.

For context, the flexible (exhaust part) is really damaged, like there is a big hole. I think it’s because of rust. Also, my intake hose is also broken so it doesn’t help.

Since I bought all the parts of the exhaust (down pipe, cat, muffler) I wanted to see the difference before/after the installation. After the cat, everything is stainless steel.

So I’ll put the video and the results in picture here for suspense…
The run was made in 3rd gear.

I mean… 57hp!!! It’s like the 1.1L, I was not expecting such a high loss.

I wanted to cry (I didn’t) but how insane it is.
And the volume of the car… AT LEAST 130dB…

So next thing is, I’ll install every exhaust parts next week.
I’ve ordered a K&N cone filter with hose that may arrive August 7th.

I’ll do another run, hope getting back the 30hp and even more

 

[bugsymike]

Hello everyone,

So I just came back from the dyno, and the results were astonishing, but not in a positive way lol.

For context, the flexible (exhaust part) is really damaged, like there is a big hole. I think it’s because of rust. Also, my intake hose is also broken so it doesn’t help.

Since I bought all the parts of the exhaust (down pipe, cat, muffler) I wanted to see the difference before/after the installation. After the cat, everything is stainless steel.

So I’ll put the video and the results in picture here for suspense…
The run was made in 3ed gear.

View attachment 470446
View attachment 470443
View attachment 470442
View attachment 470444

I mean… 57hp!!! It’s like the 1.1L, I was not expecting such a high loss.

I wanted to cry (I didn’t) but how insane it is.
And the volume of the car… AT LEAST 130dB…

So next thing is, I’ll install every exhaust parts next week.
I’ve ordered a K&N cone filter with hose that may arrive August 7th.

I’ll do another run, hope getting back the 30hp and even more

I believe a standard classic mini in the old days was something like 18bhp at the wheels.
I once spent shed loads on a motorbike performance upgrade (roughly six time what I paid for the bike) and the result on the rolling road was roughly half what had been claimed by the builder, although it did manage to rip the cush drive out of the back wheel.

 

[cauchemarre]

I believe a standard classic mini in the old days was something like 18bhp at the wheels.
I once spent shed loads on a motorbike performance upgrade (roughly six time what I paid for the bike) and the result on the rolling road was roughly half what had been claimed by the builder, although it did manage to rip the cush drive out of the back wheel.

Yes it’s heart breaking.
Hope I can really get at least the 30hp back…

 

[PuntoHowTo]

This looks like a familiar problem.

 

[cauchemarre]

This looks like a familiar problem.

Did you manage to solve it?

 

[PuntoHowTo]

Did you manage to solve it?

If you watch the other videos on my channel, shortly after that you’ll see I stripped the engine to replace seals-recut valve seats and set the timing properly, however since then it’s been off the road so I’ve been unable to re-teat it

 

[cauchemarre]

Hello all,

So I’ve changed the exhaust system. We can clearly see where it was messing (video is in French)

I’m waiting for the K&N intake to give you a full feedback, but now the car is pretty well.

 

[bugsymike]

Hello all,

So I’ve changed the exhaust system. We can clearly see where it was messing (video is in French)

View attachment 470854

I’m waiting for the K&N intake to give you a full feedback, but now the car is pretty well.


View attachment 470855

That exhaust will please your neighbours.

 

[cauchemarre]

Hey guys,

Quick update, the K&N intake originally made for the engine model had issues with shipping so I had a refund.

Instead, I bought a 90 degrees hose in silicone and an intake pipe, for like 15€ in AliExpress.

Then I bought the K&N RG-1001RD-L for 45€.
And it works perfectly, with a great vacuum sound. As you can see it fits correctly in the engine bay.

The size is 76mm (3 inches) but the throttle body is 68mm (2.67 inches) so you need to tighten up the clamp at the TB.

Then im going back to do another run to see if the power is better.

Just to remind, I was running on 3 cylinders because of a HT lead not working properly. Now I’m back on 4 cylinders and I already feel that the car had found its power back. Also fuel consumption is reduced, will check tomorrow the exact consumption since I’ll drive until the tank is empty.

 

[bugsymike]

Still maintain that drawing hot air from on top of the exhaust manifold is going to be less benfit powerwise than cold dense air that is more oxygen rich from the outside.
It is why turbo charged engines benefit from intercoolers.

 

[cauchemarre]

Still maintain that drawing hot air from on top of the exhaust manifold is going to be less benfit powerwise than cold dense air that is more oxygen rich from the outside.
It is why turbo charged engines benefit from intercoolers.

Yes, BUT!

Hot air will be sucked in mostly when the car will be waiting in traffic.
But when you are driving there’s « cold » air from the outside that enters in the engine bay and the more you drive with high RPMs the colder air you have since it mix with the engine bay air (hot).
I’ve seen a video explaining it very well:

 

[bugsymike]

Yes, BUT!

Hot air will be sucked in mostly when the car will be waiting in traffic.
But when you are driving there’s « cold » air from the outside that enters in the engine bay and the more you drive with high RPMs the colder air you have since it mix with the engine bay air (hot).
I’ve seen a video explaining it very well:

On the engine in video the exhaust manifold is opposite to air intake which may help a little.
You also may not have seen, like I have an engine under full load with the exhaust manifold glowing red hot.
If you do not accept my word I suggest doing a bit more research on the subject.
Why do you think manufacturers go to the expense of long plastic ducting to draw air into the air filter from the very front of the grill to one side of the radiator?

 

[cauchemarre]

On the engine in video the exhaust manifold is opposite to air intake which may help a little.
You also may not have seen, like I have an engine under full load with the exhaust manifold glowing red hot.
If you do not accept my word I suggest doing a bit more research on the subject.
Why do you think manufacturers go to the expense of long plastic ducting to draw air into the air filter from the very front of the grill to one side of the radiator?

Of course it matters, I’m not saying the opposite.
But the hot air coming inside the intake might be at a temperature of 40-50 ºC, the oxygen difference is negligible for 20 degrees of difference (I think).

It was the best solution I could have anyway since the OEM intake was cut…

And for turbo it’s because the air is compressed and everything that is compressed is heated. Since it comes directly in the intake it has to be refreshed because it can approach 180 °C…

 

[bugsymike]

Of course it matters, I’m not saying the opposite.
But the hot air coming inside the intake might be at a temperature of 40-50 ºC, the oxygen difference is negligible for 20 degrees of difference (I think).

It was the best solution I could have anyway since the OEM intake was cut…

And for turbo it’s because the air is compressed and everything that is compressed is heated. Since it comes directly in the intake it has to be refreshed because it can approach 180 °C…

I agree it is a neat solution as original not available, and clearly compressed air is heated as even a child putting their finger over the end of a bicycle pump knows from a young age.
All I am saying is cool air is denser so more oxygen per square inch or centimetre etc.
Hence the reason cars feel more lively on a cold damp morning.