Mbe check over and latest emissions test

[ClassicChimaera]

Alpha N
Ecu only using TPS and RPM no use of MAF to determine fuel map. Usually down to the mapper to set timing as part of building a map. Does that sound close?
Any engine changes require re map as it's not adaptive.
This based on BMW info I just skated through!
This is what I have isn't it ? No AFM( MAF)

[ClassicChimaera]

I don't think I've got a Map sensor but I don't look to hard!
I really should have asked Jason to go around it and confirm these details but you never seem to have enough time to ask all your questions or I forget!
I'm back at Powers next week and I'll do some homework this time.
I'm getting there slowly

I can now see why Turbo you use both MAF and MAP

[ClassicChimaera]

Incognegro said:

Thanks, I've further customised as you get 6 screens. I'll show when I get car back and it's running (drop off to Power tomorrow weather depending)

Main screen will show revs/speed as an accurate main with temps on its left and current bhp & lbsft on the right. It's great you can then just have on/off indicators which will show running of fans

Another screen will replicate similar data I saw a Nissan GT-R showed and I've further customised others with one dedicated to g forces and one to acceleration (I even did one for emissions). The best bit is you can print logged data and for example see when I did 150mph there was so much load with temp at? And pressure? Etc

Sorry for the vagueness it will get better

As we know these Tvr's can be fragile so having as much information available to monitor its internals must be money well spent.

I grew up watching Star trec but I never thought I'd be in it.
Exciting developments.

I'm at Powers next Wednesday so I'll look out for your car

[ClassicChimaera]

Richard 858 said:

Watch out Alun, don't burn your finger again

what a knob !

I can't get enough space in my mates garage to do the fuel lines and I'm not doing them outside so treated myself to letting Powers struggle with them instead.

I like to let them check it over every now and then
Might change gear and dif oil for the hell of it too.
I'm close to selling the dog for new shocks,,,,,, again!
Competition shocks are great but I'm not needing them really.
I might go Billie and see how they are, if I like them I might sell my 2 sets of adjustables which are like new. Probably get them checked over etc first.

[ClassicChimaera]

Richard 858 said:

I've got a set of original rear billies c/w oe progressive springs (old but quite serviceable) if you want to try them mate.

Having just put some spongie tyre's on I'm still in two minds yet Richard. Thanks I'll go find my old billie fronts and have a think. My rears were shot but I remember the fronts felt ok. Hmm.

I do like the big bush on the New Bilstein front shocks arrangement and the more I feel it the more I agree for road work that big bush might aid absorbance better than a rose joint.

[ClassicChimaera]

Incognegro said:

As I say guys weather needs to be nice for me to take her to power tomorrow. Just remembered another important fact in these conditions... I'm running federal 595rsr track tyres on the rear. I know a hedge doesn't want my cerbera so I don't feel like treating one.

Ohhh noooo.
Not a good tyre in the rain let alone bordering on ice.

I've got what look like motorbike knobblies on my car now Rainsports, but if it's even vaguely wet with all this salt it's a big no no so I don't blame you.
Really looking forward to seeing more of your computer skills so the hedge can wait

[ClassicChimaera]

Oh, so that's a MAP sensor. Thankyou Mathew for that lovely pic, I wondered what that thing did it's another part of my precious MBE. LIKE A SWISS WATCH,,, Kin ell Al ,,, enough already.
Well I'll be, I'm a very happy boy today. Thanks for the good news.
Gosh I'm thick

Jason's lesson last week was glorious and set me up, i'll know all this come next Wednesday.
So it's taking maniflof pressure readings too, divi, the plastic vacuum pipe,,, its a bit of a give away.




I've tidied it all up since then too

Edited by ClassicChimaera on Saturday 14th January 14:41

[ClassicChimaera]

SILICONEKID345HP said:

Mine just runs on TPS , what am I missing out on without the MAP sensor.

MAP = manifold absolute pressure.

Mbe off the top of my head,,,

Air goes past the air temp sensor then the throttle pot sensor then past the MAP sensor in the inlet manifold and into the engine.

The Ecu reads these sensors and in conguntion with the Rpm responses off the crank trigger wheel decides what fuel and timing to add at any given throttle position.

MAP reads air density so more info for the Ecu to make better decisions.
That's how I'm reading it. I often wonder how it ticks over from stone cold without a stepper, I think I'm starting to understand

[ClassicChimaera]

Sardonicus said:

MAP/speed density is a just another way of monitoring what the engine is doing a bonus IMO trouble is if you run a hairy arsed cam you will either have to run a hybrid Alpha N set up or pure Alpha N if you run pure MAP the noisy vac/map signal will cause havoc with low speed drive-ability like it wont already be bad enough from your chosen cam profile so if its a choice between Alpha N Vs Vac/MAP/Speed density then Vac/MAP every time MAP/Vac control is essential for FI for ultimate engine feedback to the ECU

Well I'll be, I understood that fully and know the reasons why Alpha N is a better solution when using high lift cams,

The manifold pressure on a high lift cam engine on induction stroke being so aggressive is large and the sensors struggle to understand the info.,,, I think. Pushed my luck now

[ClassicChimaera]

Sardonicus said:

Decent AFR and lots of advance Alun nowt to do with running MAP

Ok. Makes sense

[ClassicChimaera]

Incognegro said:

Weather held up and I felt brave. Argento made it to Powers safely and keys handed to Dom

Yeeeeesssss
Everyone wants a Cerb, end of,,,,, watching this come together on such a futuristic car with great long doors
Must be a treat for all of us to witness. Argento will be rocking after this.
Really pleased you made the effort. Very exciting times

[ClassicChimaera]

Map is calculating manifold pressure and air speed/density so just more info for the Ecu to go on.

[ClassicChimaera]

SILICONEKID345HP said:

Is it more difficult to map ?

Your taking the piss
You know all this but I'm enjoying learning from your attempts at numptie questions

Well it takes a deep understanding of timing for one thing, and yes it is harder to map I reckon, you have to set many parameters all the way up the Rev range.
Your using known factors and just adapting them to the spec of a particular engine.
Once mapped other than Lsmbda control it's set, but it's monitoring things and if it goes out of sinc by say 10% it will flag up an issue on the software. Jay puts in protection at all points on the map,,,, every 200 revs.
That's probably miles off but something like that

ETA so you have a controlled map but it will make changes to the map if things go out of line to compensate and the mapper can set the percentage that the Ecu will effect the mapping.
It just decides something's not right and goes to a safe set of parameters If the readings are getting to far out.

Edited by ClassicChimaera on Sunday 15th January 01:02

Edited by ClassicChimaera on Sunday 15th January 01:04

[Classic Chim]

I've been keeping abreast of what's been going on so I am aware
I had this awesome feeling in my gut which consisted of trepidation fear of the unknown and huge hope and anticipation of better days ahead when going Mbe.
Only today after over a week not using my Chim I fired her up and that usual confidence inspiring engine fires into life and breeds even more confidence every single time, I must have started it 2000 times since install yet I still find I'm enjoying it.
I'm very much looking forward to seeing the results over the coming months.
Congratulations and if you've run it in bring it to Shakespear Raceway (Stratford) on the weekend 22/23 July as I'm sure we'd all love to see it and you'll be in illustrious company with some very fast Chims etc there.
Thanks for getting back to us
Looks sooo awesome, I bet your busting at the seams Al

[Classic Chim]

Without an idle control valve and as Jason sets up the tickover at 800-900 revs I suppose it's likely on a cold morning idle will drop slightly.
Mine also displays this trait but it will still run on about 700 revs cold if I ask it, as I have my way of running up the engine I've always found by the time I'm ready to go and that's often only a couple of minutes at best it will idle fine even in very cold climbs so no problem. I don't like artificially raised revs and if it is raised I havn't got it warm enough to drive in my view anyway so it make no odds to me at all. The fact there's never tonnes of fuel getting chucked in makes me a lot happier about all starting conditions. If your friend has this problem then return it to Power! Even stone cold the extra advance should pull the engine through its rev cycle and mine lives outside and I've started it many times with -5 degrees conditions and it will never stall?
My idle dropped even with engine warm and that was put down to a badly adjusted idle screw. Very odd! Simple adjustment and slight change of some parameters later (5 mins work) and it's been excellent since.
I'm sorry but my car is not faster de catted Dave,,,,, not one mph faster!
Feels it but the times don't lie on a race strip. I don't like this fact so it's either my engines lost its edge or de cat doesn't work on mine,,, here's a telling fact,,, I mentioned de catting to Dom and he scoffed and just said you'll go back to Catt,, I hate the bloke,, he's always right
Maybe my induction is a bigger restriction and starving my engine power more than any exhaust will,,, feck knows but overall my cars no faster with a lovely de Catt Y at the top end.
I need a dyno session to be sure but it feels just as fast as ever on the road so it's an odd one.

I also have a suspicion Jason's mapping is conservative at those higher revs,,, engine life and reliability etc rather than pure power. Not a bad thing for about 95% of us.
It's always important to remember the pressure I applied, all along I said sod Bhp, give me torque and I have a very healthy torque curve for a boggo 4.6 engine. Beat Daz and Jacko off the line,,, once each I might add, got stuffed every other time by the 5.0 cars.

[Classic Chim]

Good old choke knob
Does yours have an idle valve Anthony, seem to remember seeing a Bosch one