AFR guage ,probe kit suggestions ?? Help ebay ?

After my engine issues at donnington due to poor AFR above 6500 rpm the consensus is I need an AFR probe and guage
Suggestions please
Ebay have a few
Do I need data logging ?
This is for a KR engine with kjet so no ECU data available
Do I get a digital guage or combined guage ?
Thanks guys

 

I am one of the few that rates the luminition dash ones running a narrow band probe. Cheap, simple, seems to work ok
Jon

 

What's the difference between wide and narrow band ??
How much is cheap John ?

 

10 parts air to 1 fuel (rich) to 20 A/F parts (weak) would be a fairly wide band.

120 ish
Jon

 

Bump while there's no competition lol

 

Futureproof yourself - http://www.innovatemotorsports.com/products/MTXL.php

 

I have one of these. I bought it after my K-Jet caused det and piston failure years ago at Donington. Can`t fault it. Dead easy to read at a glance, accurate and sensors last OK (I`m on my 3rd now)

AEM-Digital-Wideband-AFR-UEGO-Controller


You`ll need a Boss to weld to the exhaust, I don`t think the kit comes with one.

 

I`ve been looking at the AEM Wideband Failsafe gauge !

AFR and boost gauge combined, but you can set alarms in the gauge, so if AFR exceeds a user defined limit at a certain boost level, it alarms AND lets you operate something with it. In my case, I`d use it to cut the supply to the boost controller, automatically limiting boost in the event of high AFR. Oh, and it datalogs too ! Overkill for Mike`s use, but I`m looking at it and wondering if I should sell my Wideband and buy one of those instead.

 

Surely you have the cut out/safety functionality in MS? And you have MSDroid for the logging?

 

Alarm is a great idea
Looks like hardware prices are coming down, wideband was dear, for a while
Jon

 

Something I've been looking to do for a while. Engine builder suggested fitting one as kjet can go off the boil and still seem ok driving wise.
What AFR should kjet cars be at WOT?

What was the rest readings on your car mike? Good apart from 6500rpm +? What does yours rev to?

 

AFR ... not a full WOT but at peak power

Modified 2.0 (9A) 16v kjet ... modified WUR

From an impromptu RR session, kjet had not been fully checked (pressures) beforehand, CO was in spec. though.

 

Just driven back from wick 450 miles
Thanks for the tips will read in more detail later in bed lol

 

No, it doesn't. Only safety is over boost.

I do have datalogging from msdroid, more channels too. The concern I still have is if the map sensor in the ecu starts to fail, it'll underfuel and I may not know. I don't have an external boost gauge, so I have no way to compare the msdroid reading from the ecu to anything else.

I've sent AEM an email, but I'll probably sell my wideband, with the new sensor, and fit the failsafe one. On N/A, the failsafe gauge is of zero benefit, just useful in boosted applications

 

On a NASP 16v, generally best lambda for power is between 9-12% richer then stoich with maybe a 15-20% increase in fuel for component protection at 5.5 to rev limit.
On Kjet, typically, up to 4k can be around 11% richer than stoich and coming up to 6k start to run towards stoich.
Some engines with WUR modifications can hold the enrichment say >10% for a wider range of engine speeds, until starting to lean out again.

 

How did you arrive at that conclusion though?
Went lean and PI'd into det, braking a ring land?
Or experienced detonation due to where the dizzy was set thus breaking a ring land.
Seriously, I doubt an AFR meter would be a requirement if the car is set up properly, neither will you be monitoring that when at full chat on a trackday.
If you are making multiple changes to the vehicle that affect air charge and have the knowledge to tune the car yourself, then I can see how such a purchase can be helpful of development. You are on K-jet though which is very predictable on fuel profiles as can be seen from a dyno test.

 

My print out

 

Ok Eddie I suppose I'm getting sidetracked
If I set the kjet up properly nothing can change much so don't realy need AFR guage ?
Just thought having one means I can keep a general watch on AFR issues rather than the hassle of trailer ign it to ADE every time I mess with something and if I get one with data logging I get a little bit of data to keep an eye on things ?

So Eddie you think there's no point ?

 

I personally have an AFR gauge on every comp car. Why wouldn't you?
Jon

 

It's not a competition car , I can't afford that lol
I just thought it would be nice for extra piece of mind after my woes at donnington