need help with idle

[Ben Stairs]

hey everyone  im new to this obviously and have a few questions about how to tune and how to become fluent with the link program  First off though should describe my ride  89 Nissan 240sx with sr conversion fresh built with je pistons eagle h-beam rods cosworth head gasket bc valves springs guids and titanium retainers  hks rocker arm stoppers tomei 260 procams Garrett gtx2867r with 63 ar housing atom ecu injector dynamics 800cc injectors and a few other goodies mostly for dressup. So here is my issue I took my car to be tuned on the dyno about 12hrs away from where l ive and they ran into issues so they say  i asked if the tune was safe the way it is and they said yes but do not see how they can say that since the ex manifold was cracked and now that put the stock unit back on I can hear detonation  i have been tunning out the det with timming whenever hear it and catch witch cells its comming from but I know that if I can hear it it is way out of control and dangerous. I have much experience tunning except old carbs and such so one thing I am wondering about is how much should I retard the timming past what can hear to be on the safe side? Point #2 the idle is very high (1500rpm) when warm or go over a certain rpm. not sure how to correct this brought the idle target down to 600 from 1100 at most temp ranges and made no difference. how can I correct this? my afr seems to be quit good on the wide band but when hit the boost limit I notice a puff of black out the back which am assuming unburnt fuel due to ignition being cut. now here is the strange thing about that have my boost controller set to off (or bypassed) its supposed to be a 7lb crack but I have been making almost 20 lbs of boost then with my controller on and set for a wg crack pressure of 11lbs and dutycycle set to 21 percent it will make 11lbs of boost and it seems to be overly sensitive to temperature notable in det and boost. when on the dyno they said the boost was creeping up with just the waste gate but spiking with the controller initially then it kept steady after that. aem true boost if wondering about boost control any advice will be helpful however I have been on forums befor and if you are not confident that what you are saying is the correct way of doing things I don't need to hear it because will listen and try the suggestions trusting you know what you are talking about wh the possibility of costing me my brand new $15 000 investment with no cost to you  

[Simon]

Tuning is much the same as for carbs its just you have way more tuning points available.

The High idle will be due to the base duty cycle being too high in the idle control or there being an intake leak.

The control is locked out if the RPM is over the target by too much. This is user adjustable.

I would start by plumbing the wastegate direct so it only gives spring pressure. And sort other issues before looking to ramp up the boost.

Where are you based in the world, we have guys that have tuned using team viewer from across the world so we do have the option of teeing you up with one of them if needed.

[Ben Stairs]

So this is starting to look like an old post, but it's still current. I just got my car back on the road. It's a long winter here in northern BC Canada. If you can help me out remotely, that would be fantastic, just let me know how to do it and let's go. Sometimes I work retarded hours but things have slowed right down for now, so if we can set up for a weekend or evening I'm game.

[Simon]

Hi Ben

I will flick you an email with a contact that will be able to help out.

He has a much better tuning back ground.