My Major Project PrtII - Single turbo Conversion

[leeroy_25]

Hi There, I didn\'t get a notification for some reason so only just saw this! Thanks for the info. Glad to know it\'s a general 850cc setup problem! Geff was wondering if I had a dudd ECU!
When you say you altered the Injector lag times. Are you able to do that in an rpm range and not just globally? I gather altering lag excessively has the effect of reducing the injector flow? So if it can be done in a problematic area of the map I can see how that could work.. Not sure though why it is not possible to get the running right on cruise at 2000rpm? That is probably the most annoying thing! I tend to drop a gear so I can sit with the rpm higher to try and get around that.
I see what you mean about the AFR following the boost.. It\'s like a mirror image. Just not so smooth! Also interesting that AFR\'s should be different at different loads etc.. Although when I think about it I guess it\'s logical. Saftey margin at high load/rpm and economy and emissions at the other end.

Thank you
Lee

[turbotoaster]

No you cant change the lag times for parts of the rev range, it effects everything.

But its the only way your gonna get a decent idle to be honest, well without going for a full bridgeport that can suck that much air in on tickover you can run proper idle afrs lol

The biggest issue ive come across with injector lag is low rpm throttle response.....because you are infact delaying the time for your injector to open when you press the throttle for that split second the injectors havent reacted to your change in throttle position and it stumbles......ive tried many ways to get around this but if your running alot of lag like i am theres only so much you can do.

You cant really get around that low rpm richness im afraid, its just the limitations of the ecu, keep it in the low gear and press the accelarator a tiny bit more, you will be surprised that it doesnt mean your car suddenly shoots forward but it leans the afrs out and makes it better.

well the afrs are very hard to get perfectly smooth, but thats a very good afr map, ive seen alot worse that tuners pass off as ok.


One thing i wouldnt advise now is to not mess with the lag without a wideband because it will effect the whole map and make it leaner everywhere, geoff knows what hes doing so ill bet its got a bit of lag already in it to stop it running pig rich on idle, give him a ring and ask him about it and see what has been done.

what rpm on the power fc does it say the car idles at and what inj duty does it say at that rpm?

[leeroy_25]

Hi There,
Thanks for the info again. I am slowly picking up bits on the ECU progamming! Would love to know a lot more than I do!
Okay so bridgeport it is! I was actually thinking peripheral port!

I spoke to Geff and I don\'t think he has put lag in as he didn\'t want to effect the rest of the map. How much that would effect me top end I am not sure??

I have to say Geff has been great and I am more than pleased with the results. Just Geff got a bit stuck on the AFR problem and was looking for other feedback in case it was a dodgy ECU or something more sinister. Also as I said I don\'t really know what a good map looks like other than a nice smooth torque and power curve! So just trying to learn a bit more for myself!

Thanks again.
Lee

[turbotoaster]

its harder to get decent idle with a stock port aswell as it physically sucks less air into the engine when idling so that will be the reason he is struggling alot to get a decent afr at idle.
 
i did some tests on a stock port of a friends to see the difference, at the same rpm(idle) to maintain the same afr i had to run 30% more fuel in mine, so you can imagine its easier.
 
afr is the most important thing when looking at a good map, after that its the timin thats been applied to the engine, unfortunately its not something you can see from a dyno graph.
 
Lag wont affect you top end, with lag you will still be able to get the same sort of power, you just have to map around it.
 
let me know what rpm your car idles at and what your inj duty says and i can roughly calculate what your afr is at idle

[leeroy_25]

Hi There, I meant to say last post I don\'t have a hand controller at present so short of going to Geff and borrowing one I cannot tell you what my inj duty is or idle I am afraid!

Thanks for the offer though.
Next MOT will be interesting! I need a compressed air bottle to plumb into the intake piping or exhaust I think!

I wanted to port the engine when it was rebuilt but funds and time did not permit sadly!

Lee

[turbotoaster]

get your hands in your pockets and get one, i cant specify how good there are to have.

you can monitor nearly everything on the engine, things like knock, air temp, inj duty, water temp, its such a good thing to have, they are about £200 new or cheaper if you can get one second hand.

who built the engine for you, porting only costs around 200-300 more.


on the MOT front you have 2 choices, take it to a \'mate\' or a rotary tuner to push it threw an MOT with bad emmisions or stick the 550cc back in for the MOT and turn the fueling down at idle(you will need commander for that)

my MOT next year im gonna try massive injector lag and a cat to get it through then turn the fueling back to where it was and put the exhaust back on

[leeroy_25]

I have been keeping my eyes half out for a second hand commander. I had one on my old car and due to my lack of ECU related knowledge I didn\'t really use it other than to monitor knock. I wasn\'t too fussed getting this ECU without one.. But being that I am trying to learn a bit more on the ECU setup front it would be worthwhile if one comes up cheap. To be honet the car will be up for sale in the not too distant future to make way for my next project! I just want to get on and enjoy it for a while!

Geff built my engine.. I was on a tight budget and Geff had very little space or time to do it and could not really do the porting as well.
I had a spare engine I had been planning to port and rebuild myself but it went pop rather unexpectidly so I did not have that luxury.

MOT wise I will sort it one way or another. I still have the CAT I can put back on!

[cr33ch]

what Holset turbo is this one?

[leeroy_25]

Hi There,
turbo is an H1E.. well WH1E to be more specific which I removed the internal wastegate from.

Lee

[cr33ch]

oh right, do you know what that is like in the scale of the hx30/35/40 etc

[leeroy_25]

Yep!

It\'s basically an older HX40.. HX40 is a refined design with better blade technology and a few more otpions. HX40 is hard to get hold of though being relatively new unless you have no quarms spending out for a new one.

Lee