Roughing out weber settings
Turbo Mini Forums

Picking back up on an old project I lost enthusiasm in a few years ago, so be get doing a bit of trial and error on my 1380, 649, 11.75:1cr motor before taking it over to a rolling road (we still dont have one here on the isle of man!!)

Now talking AFRs, Its ticking over @ 13.2:1 ish (1400 rpm), with 13 degrees advance from an aldon red dizzy (once i have it on the road ill stick the megajolt on with tps)

Now I just was hoping people can advise on what AFRs to expect on the move.

When you punch the accelerator, the pump jets will obviously throw extra full in, so how rich should I expect it to blip to?

Also, on a side note, its ticking over @ 1400rpm (anything less and it starts to splutter and eventually dies), i dont want to advance the ignaition any further as is statically timed to over full advance of 32 already... anyone got any tips for getting it lower, or is this just what i should expect on of this cam/cr combo?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Main jest of 180 with an F2 emulsion tube and a 170 Air on the main circuit

50F8 idle circuit should be dam close

AFR on full beans of around 12:1 dot pay any attention to the AFR on idle that cam will have it all over the place

Mine idles quite high so i would imagine yours would do the same.

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

Cheers guys

If say i were to floor the throttle open, is the idea to get the pump jets to give enrichment to around 12:1, then the main circuit 'catchs up' and gives the constant 12:1?

or will the enrichment just chuck a big slug of fuel in to help the transition to full load and i not worry my little head about it?

cheers

joe

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

I think the latter is the case,

It will only be for a split second anyway once the main circut reads rite the rest should follow

well, now its on the road i need to address the fuelling

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Think I ll be going down this route with my 1293 + Weber 45.
I have a Megajolt v.4 MAP though - is it necessary to convert it to TPS?
When I looked into it last I kept reading differing opinions (surprise surprise) - just wanted your opinion on it.
Apologies for ninja-ing in.
:)

http://www.jolyonway.com

No problem,

my opinion is....dunno, havent got one ha

in short, i was going to use my map mj on this, with a take off from each inlet runner, tee'd together into a fuel filter to buffer fluctuations/pulses, then to the mj map sensor

From what ive gathered, this is the preferable way to do it as map is a true reflection or better representation of the load on the engine

but a tps mj came up for sale on here, imo its easier to bolt on without pissing about tapping into the inlets, so im gonna use that one on this, save the map mj for the 998 turbo when/if that ever gets done (im a slow mover lol), and follow this guys tps install:

http://www.cate1.co.uk/megajolt/installation.php

ordered a ford tps today off ebay, so will try and get it polished off this week, still learning my way around megajolt though, and this laptop doesnt like talking to it :(

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Ah ok.
The map method you describe is what I had read before.
I didnt realise you were doing it just because you got a cheap tps
Anyway, god knows how long it will be before l get access to a certain pile of money,and hence a turbo mini, so I may as well use my MAP thingymabob.
I shall follow this however :)

http://www.jolyonway.com

I'm not sure why you want to get the idle so lean, to be honest I just set the idle mixture to wherever the car runs most happily, anywhere around 14.7 (stoich) or leaner should be good enough to pass an emissions test if needed.
So really just set it to where it idles most happily and don't worry about trying to make it too lean.

no emissions or mot here, but i just had it in my head that the leaner the better for some reason?


im still very much learning about carb set up, so this is will be an interesting time for me

*edit* whilst im here, better just check im on the right track

For cruising, im looking for stoich
Full throttle should be about 12.5:1 yes?
And what should it read when i shut off? anything? or should it just lean right off the wideband (i.e 17+)?

Cheers

Joe

Edited by joeybaby83 on 10th Mar, 2010.

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

idle is a funny thing to tune , especially on a cammy engine, just start lean and gradually richen it up till it sounds right, AFR numbers etc are usually a load or crap due to overlap.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

As denis says stay from tuning idle afrs it means nothing on and engine with a big cam. Aim for 12:1 when you nail it and then get it to a rolling road for the fine tuning