3.5R k24 2016 ECU?

[Bybarth]

Hi,
I'm thinking of remap my car for E85 an maybe increase boost a bit.
It's a 3.5R whit K24 engine.
Anybody know what kind of ECU sitting in my car and what to use when remap?
I got a OBD2 in the car if that's an indicator what to use for a remap?
The plan was to make It accepting normal gas an E85 via a flexi fuel sensor.

[Peter255]

[mention]Sir Nick[/mention]

Nick's your man on here to discuss this topic, after speaking to Ariel. I don't think Ariel will help you remap your car though.

As discussed on Facebook i don't think you can reliably turn the boost up on that engine as the charge temps become an issue. I have heard the k24 runs quite a bit less boost for that reason.

Have you had the car on the rollers yet to see what power your getting now?

[Bybarth]

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

[Sir Nick]

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!

[Bybarth]

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?

[Peter255]

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.

[dreamscape]

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...

[dreamscape]

"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 ;-)

[Bybarth]

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

[Peter255]

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!

[speedmachine]

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?

[Sir Nick]

Long way to come from Sweden!

[speedmachine]

Long way to come from Sweden!

Minor detail

[Bybarth]

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?

[Sir Nick]

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