11 replies to this topic

[MiniLandy]

Well, due to noticing how skint i am recently, i'd rather not shell out £200 for a rolling road session.

So, to allow me to tune my MegaJolt ECU, and carb needles, i'd like to install a Lambda gauge on my car.

My question is, where can i get one from? Has anyone on here had any experience of buying/fitting/using one?

Cheers, Paul.

[amarcd]

I would also like to know about lambda gauges as i'm on the Isle of Man and so have no rolling road! thanks

[mini13]

A good one to get is the AEM wideband,

they are on ebay for about 150quid.

Weld the bung into the exhaust, bolt the sensor in, mount the gauge and connect it to a live feed and away you go.

the hard part is profiling the needle!

[amarcd]

is there anyway you can use one just to set up the carb without the need to weld and mount the sensor?

[lrostoke]

All the ones I've seen require the sensor fitting in the exhaust.

From what you say if its only to tune the car rather than a rolling road, I'd say the rolling road is going to work out the better bet.

The lambda will only tell you the air/fuel ratio but for profiling the needle you also need someway of knowing which section of the needle needs profiling.
Just sitting in the drive making adjustments won't be the same because you'll have non of the frictional forces a rolling road can exhert on the engine.

Saying that if its a common setup eg cam , bore size , carb thats been used by others then chances are they will know which needle works well, its just a matter of setting the tickover mixture then, gunsons gas analyser works well for that, about £80 although ebay can throw up bargains

Edited by lrostoke, 08 September 2010 - 07:34 PM.

[MarkGTT]

i use an AEM wideband, its great but to profile the needle you need to understand the how the carb works, and gauge where the needles is in the carb corresponding to the throttle being opened.

i have used this method for 2 different needle requirements so can be done.

[amarcd]

All the ones I've seen require the sensor fitting in the exhaust.

From what you say if its only to tune the car rather than a rolling road, I'd say the rolling road is going to work out the better bet.

The lambda will only tell you the air/fuel ratio but for profiling the needle you also need someway of knowing which section of the needle needs profiling.
Just sitting in the drive making adjustments won't be the same because you'll have non of the frictional forces a rolling road can exhert on the engine.

Saying that if its a common setup eg cam , bore size , carb thats been used by others then chances are they will know which needle works well, its just a matter of setting the tickover mixture then, gunsons gas analyser works well for that, about £80 although ebay can throw up bargains

The the problem is there is no rolling road in the isle of man so it would mean getting boat to the UK. What are the colour tune kits like (clear sparkplug) Wheres the best place to get one or the gas analyser from other than ebay?
thanks

[lrostoke]

Not sure what shops you have over there, Halfords sell them here, I would think any motor accesory outlet could order one in for you

[MiniLandy]

Well as has been said, buying the full AEM kit is just as dear as a rolling road session.

Does anyone know about the inner workings of how these things function? i.e is it possible to buy this and then source a Lambda probe off a scrap car?

Cheers for all the responses so far people, appreciated.

[mini13]

Unfortunantly not,

what you can do is connect a narrowband lambda sensor to a gauge for about 30 quid, but this wont tell you much, only if the engine is running above or below stochimetric.


the Wideband lambda is a sophistcated bit of kit, if you want to know more about how it works.... http://www.megamanual.com/PWC/

[GreenMini17]

Stack do a nice good quality one. See this: http://www.merlinmot...oduct_info.html

[Ethel]

14point7.com are a similar enterprise to Megajolt. Innovate are good too.

Data logging to a pc will be more useful than a gauge if you want to tune your car on the road.

D-i-y dyno craftiness