First impressions, not that good.
Had few probs since installed but thought these ecu were supposed to be capable and very good.

Just wondered if you guys who have had them fitted have had any probs.

I have idle probs, revs fluctuate +/- 400rpm, more so if I put any load on the engine ie put the heated window on,once starts doing this it wont stop until driven.
When starting it starts lumpy.
I also get over boost, this only seems to happen when I floor the throttle in say 4th revs at 2k with no boost and let the boost build from nothing.
If I give it the beans from 1st to 5th it seems be ok.

Mods inc

MD321T
650cc
pump
harvey ported headers
3" full decat
fmic
caik
3 bar map sensor

Have any of you peeps had the same probs or any help on this would be great.

 

Who set it up for you?

TX.

 

All of the above sound like mapping issue's mate,who mapped it for you ?

 

I'd take it back to your mapper and get them to look at it !

 

Had a play in the snow today and commented to someone about my idle sitting happy at 900rpm, no fluttering up or down at all and starts amazing from cold and hot.

JGM mapped mine and did a great job. You map probably needs looking at. Probably needs mapping from cold, like overnight cold and not just after you've driven to a mapper and warmed the car up.

 

Thanks for the info guys.
Id rather not say who mapped at this stage.
I have spoken to couple of other mappers/tunners etc.
Just want get as much info as i can on this so I no what im talking about.

Is there any other things that could cause the overboost that I can check?
Is there a option on the simtec that can control/rev up the engine like the oem ecu did when the air con comes on?

Thanks again peeps.

 

Hi Chris

Yes I have done this but still doesnt start like it used to on oem ecu.
It does always start, it just seems to hit an miss until its started.

Thanks for the reply Chris

 

Yes, there is an idle up compensation activated via the aircon switch.
There chances are it's trying too hard to achieve it's boost target, allowing a momentary overboost during the situation you describe, which isn't apparent during any other scenario.

Martyn

 

Had my simtek fitted and mapped by duncan and had idle issues ,after a quick call he came and sorted it out at no charge works spot on very happy with it.

 

[QUOTE=MartynJ;10471674]Yes, there is an idle up compensation activated via the aircon switch.
There chances are it's trying too hard to achieve it's boost target, allowing a momentary overboost during the situation you describe, which isn't apparent during any other scenario.

That would explain the air con then, would the engine nearly stall if this wasnt turned on?
In the overboost situ, can the simtec not correct this by opening the waste gate further and bring the boost back to what it was set at?
I had the 3 bar map sensor installed to or so I was told would help this?

It was first mapped at 1.45bar on standard map sensor and was told needed the bigger map sensor because there was not enough head room and that was the reason for the overboost.
I needed to run 1.6 bar to make the power.
Installed the map sensor, mapped again and ran higher boost made more power but stil had the over boost.

Cheers Martyn

 

What size injectors you running?
Have been told this can have an effect.
Bigger they are the worse it idles?

Cheers Lee

 

Sometimes they can be easy to get 100% without idle fluctuation and sometimes a bitch..
Espeically with temperature changes and different loads..

give the mapper a call and get them to try and sort it..

Simon

 

Hi simon

Thanks for the reply.
Just so I got this 100%, even if its a bitch, can it still be sorted and got to idle nice?
Do the injector size make any dif?

Cheers Ade

 

you should be able to have a near exact idle to oe yes..

injector size and quality can make a difference as they need to be well balanced at small opennings like idle but not usually a problem. 650cc injectors not usually a problem.

you know what make they are?

 

It was originally mapped with 440cc but on my next map i have lateral 900cc so il let you know mate

 

Denso i think, from america( have receipt from when previous owner bought)?
Does that sound right?
Supposed to be flow matched

Ade

 

Thanks mate.
Yes drop me PM, i will be interested to know how you go on and power it makes.

Cheers Ade

 

denso should be okay

 

+ 1

 

I've been suffering a **** poor idle/regular cutting out ever since i bought the Simtek three years ago, can somebody please explain what parameters have an effect on idle please...

I've got the software and dongle, have been messing about with the fuel map for a while now, just when it seems like i've cracked it the damn thing starts hunting and/or cutting out...

How do you mappers go about correcting the idle? Is it as simple as hooking up a wideband and adjusting the fueling at idle until its spot on or are there other paramaters apart from the fueling that you tend to adjust?

Thanks
Harry

 

fuelling will obviously effect it along with the ignition map - if you get it spot on and then it hunts etc in traffic, then take a look at what the air temp compensations are doing - ignition corrections and fuel corrections and can be used to keep it stable both when hot and when cooler idling..
the actual idle duty (how much the throttle by pass valve is open to give the idle speed) is in the second section (hardware from memory - just auto matically go to it without reading the title) so M and scroll down one.. and look at output functions and air by pass valve duty.. there is also conpensation on that for coolant temp and air con.

Happy to take a look and show you if you want

Simon

 

Thanks Simon

Had a play with the throttle bypass valve duty, it's much better now

I'll give you a shout sometime next month, too busy with work at the moment.

Thanks
Harry