3.5R k24 2016 ECU?

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Re: 3.5R k24 2016 ECU?

by jordanhiggins2002 » Mon Oct 21, 2019 4:49 pm

I would definitely shoot for 11 psi if you're going to undertake this project.

Has anyone changed the pulley on the k20 for more boost?

Re: 3.5R k24 2016 ECU?

by Bybarth » Fri Oct 18, 2019 7:33 pm

When I were in the area of the firewall to mount the ECU I discovered this burned fuse holder!
I guess its for chargecooler pump?
Seems to go to the strange relay in a small plastic box besides the positive hub connection.
Anyone who can confirm that?
Any guess of which amperage the fuse should be?
Need to mount a new fuse holder.
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Re: 3.5R k24 2016 ECU?

by Sir Nick » Thu Oct 17, 2019 8:46 pm

Yes the engine/ecu is from the USA si. The flashpro is expensive but gives engine tuners access to the essential parameters they need.

Re: 3.5R k24 2016 ECU?

by Bybarth » Thu Oct 17, 2019 5:36 pm

Hi guys,
I remowed the ECU today and according to the serial number it's an ecu for an Civic Si 2012-2015 US.
And it should be able to be tuned via this: https://www.hondata.com/flashpro/flashp ... 12-2015-us
Anybody have any experience of the flashpro, is it ok or?
My plan was to use a fuel sensor so the ECU can switch from petrol and E85 depending of the fuel quality, but I'm only familiarly whit cars whit turbos where you can adjust boos accordingly but i guess I doesn't work whit a sc?

Re: 3.5R k24 2016 ECU?

by speedmachine » Thu Oct 17, 2019 4:58 pm

Sir Nick wrote: ↑Thu Oct 17, 2019 4:52 pm Long way to come from Sweden! ;)
Minor detail😄

Re: 3.5R k24 2016 ECU?

by Sir Nick » Thu Oct 17, 2019 4:52 pm

Long way to come from Sweden! ;)

Re: 3.5R k24 2016 ECU?

by speedmachine » Thu Oct 17, 2019 3:25 pm

Peter255 wrote: ↑Thu Oct 17, 2019 7:03 am I would strongly suggest you get a baseline power output figure now on an independent rolling road / dyno now before you begin any modifications.

Doing so again afterwards means you can fairly judge you gains.

Good luck, I am interested in your journey! :)
When is your dynoday, maybe he can join?

Re: 3.5R k24 2016 ECU?

by Peter255 » Thu Oct 17, 2019 7:03 am

I would strongly suggest you get a baseline power output figure now on an independent rolling road / dyno now before you begin any modifications.

Doing so again afterwards means you can fairly judge you gains.

Good luck, I am interested in your journey! :)

Re: 3.5R k24 2016 ECU?

by Bybarth » Wed Oct 16, 2019 3:55 pm

Interesting regarding euro classification, could be a reason 🤔
But if the car produces the stated 350hp today it got a potential if the cooling could be sorted hence E85 and methanol injection.
My cars atock boost is 8.7 psi and if it was possible to increase to say 10-11psi it would around 400hp?
But to get there I need to be able to change the map🤨

Re: 3.5R k24 2016 ECU?

by dreamscape » Wed Oct 16, 2019 2:37 pm

"but I think it is fair to say Ariel ran out of k20's and had orders for 3.5R's so they used the available engines"

Well possible, moreover it was the only way to get the Atom still registered outside the UK at this time, at least until September 2015, when Euro 5 expired.

That will probably be the reason why this AA3,5R is tolerated in Gretas country on the road ;-)

Re: 3.5R k24 2016 ECU?

by dreamscape » Wed Oct 16, 2019 2:17 pm

Maybe a bit off topic, but I know that the standard AA3 SC had already 319 HP!
So what was the 310HP upgrade actually for, did it have 330HP after that? Or was it slimmed down to 310?! :-)
Bit odd...

Re: 3.5R k24 2016 ECU?

by Peter255 » Wed Oct 16, 2019 10:55 am

This is obviously a sensitive topic, but I think it is fair to say Ariel ran out of k20's and had orders for 3.5R's so they used the available engines. Thats why. Whether they have the same performance is up for debate. They are higher torque engines but with lower rev limit and they cannot take the same amount of boost. This means they don't generate as much power judging from Nicks car. BUT we don't have data from other k24 3.5Rs. It is really essential to get your car on the rollers to see what your car is putting out at present. If your car is circa 350 BHP then Nicks is not performing as it should and may be an isolated problem. However if your car is also around 320 then it does appear to be a model specific difference.

For comparison we have seen k20 3.5 R's showing the correct power around 350, but not yet a k24 3.5R. The issue is we have only seen test results for Nicks car.

IF neither car is near 350 BHP clearly that not great as the cars were sold as 350BHP. Why pay for the expensive engine upgrade if the supercharged k20 3.5's are similar power as standard. Just save the cash and buy the cheaper k20 model with the same performance. :(

Re: 3.5R k24 2016 ECU?

by Bybarth » Wed Oct 16, 2019 10:18 am

Ok thanks for valuable information sir nick👍
One question popping up in my mind are why ariel sold these 3.5R whit k24 engines and promised same performance as the K20?!
It sounds like the customers where fouled or?
And why isn't the cooler working, is it to small or what?
And how is it working could the cooling be improved bigger pump maybe, it doesn't seem to flow so much today?
I will keep on focusing on trying to run it on E85 and higher boost and to do that I need a new map🤔
Which size of crank pulley should I aim for to reach like 10 psi?

Re: 3.5R k24 2016 ECU?

by Sir Nick » Wed Oct 16, 2019 9:58 am

Hi Bybath. I looked into this a while back after a dyno run showed the car had 322bhp and not circa 350.
After a lot of red herrings from the factory I found out on my own that the K24 3.5Rs run a lower boost, around 8psi, not the 11psi of the K20s. Tom eventually said that they found the inlet temps would go out of range if the boost was increased. I don't really see that given the very large charge cooler radiator in the side pod?
I looked at having a larger crank pulley in order to increase the boost, then a remap.
The ecu in our cars are not mapable. You would need to invest in the Hondata route. I looked at having the ECUTEK ecu installed as a slightly cheaper way of being able to remap, plus it gave a lot more features than the Hondata.
However, our ecu is everso slightly different to the 3.5, it would need an intermidiate loom made in order to go the ECUTEK route. This alone would cost around £1,000. So I abandoned the project.
It will be interesting if you find a way!

Re: 3.5R k24 2016 ECU?

by Bybarth » Wed Oct 16, 2019 9:03 am

Ok, I heard that there was a heat problem hence the lower boost on the k24.
But here in Sweden E85 are available everywhere and that fuel runs much cooler.
Normally on a turbo engine you gain a lot hp when converted, don't know if a supercharged engine response are the same?
But I don't know if the ECU are mapable via k100 or flash-pro or whatever thing to use?
So if anybody can tell me what tools to use for a remap I will be thankful 🙂

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