You still wont get a 100% result every time. Like I said a few BHP here and there...

you know your car is healthy and is running well, that is the goal for me when going to an RR unless the power is way down signalling something is wrong. If you got another 10bhp on another rolling road would it make you feel better? Its still the same car!

Ahem!!! Do I win some sort of prize for accuracy?

if you was 3bhp higher lol

Weeeelll.... I guess everyone goes on their experiences with PT.

Mine is that my car has a unichip and when it was going for its remap I asked for it to run dual ignition maps as I have aquamist.

Now I also have an AEM AFR gauge in my car and on high boost/aquamist on all the way to redline I'm in th late 11's.

Problem is I tested the map with my aquamist turned off and as soon as the boost comes on I'm into the 13's. That would be bye bye engine if I hadn't had a AFR gauge and participated in a track day.

FAO Technics. Your map is fine AFAIK (I took your car to SRR). It hasn't wondered but I would be very weary of running high boost if you don't have your aquamist on!

I thought the aquamist is on all the time, the gauge shows flow all the time anyway.

Also, sorry, what is AFAIK? LOL.

Cheers Kenno.

.....as far as I know.

From the small amount I know about engines and flowing fluids I'd say The Idle Problem is down to what really seems to be the cars common feature - the SIP. (Just like others already are on to)
The intake basically needs the std. bends to get a even (lowspeed) flow. That's why it cannot be mapped out.
My 5 cents..

Also - how could the cars ECU's possibly differ? They are exactly, digitally identical.

That's a possibility but I think it’s more related to the AFM. SIP moves the location of the AFM closer to the turbo and I think this is where the problem lies. It’s not usually normal idle but under very certain circumstances the problem occurs just like what luke described. I will have the answer to weather it’s the AFM in the very near future

Yes you are right the ECU's are the same (processer, ram, table size etc) but they have the ability to adapt to your setup over time making them the same but unique. If they have been remaped then the maps have been changed; there are many things inside the Bosch ECU that can be tampered with.

I had a SIP on mine and occasionally I had the same idle problem that luke described.

The revs would bounce between normal idle down to about 500rpm almost cutting out. I dont think it was down to the SIP though, because if I opened the bonnet while it was doing it and fiddled with the wiring that goes to the throttle position sensor it stopped immediately and didnt do it again for months (except sometimes for a second at the first junction of the day, but not continually).

I could get it to start doing it again at any time by fiddling with the same piece of wiring while the engine was idling, but it would stop after a few seconds if initiated in this way.

On my car it was definitely something to do with the TPS, or the wires that go to it, or anywhere that could be affected by moving those wires around a little bit. I ruled out the ICV by cleaning it and replace with a spare one, neither of which changed anything.

Ditto.

The bouncing idle on my car was due to the wires leading to the TPS.

Very interesting, seems a bit odd but definitely worth checking out.

Yes but you CAN turn it off by pushing the black button. Also if you run out of mixture then you'll be at risk.

The car was not mapped at Perfect Touch with a cracked manifold, the crack only became apparent after a trackday at Bedford, which was after the car had been mapped. The fuelling printout from Surrey RR was when i had a loose turbo bolt and a cracked manifold.

The car was in perfect health when it was mapped by Rob, and tbh if it was running that lean (15 afr) because of the fuelling map by PT then im surprised it did not melt a piston after doing 25k miles and 3 trackdays.

akeme, didnt say it did have crack when mapped at pt. All i've said is that it DID have a crack etc when it made 335bhp on a PT map which is only what you told me when buyin the car. You got to admit that exactly the same setup mechanically apart from different air filter and pace radiator different spark plugs and now with perfect afr throughout but at 1.5bar its made exactly same figures it did at 1.35bar? I think there may of defina ly been somethin not quite rite.

At what RPM do you get max power?

Oi! Hands off my (lack of) prize! Just call me the BHP-predicting machine

if i could find my new graphwould tell u but old one at 335bhp was 6800rpm (where the afr graph is showing 13.4afr) but again this is supposedly well out as there was cracked manifold turbo bolt loose on this run

will try find saturdays graph as cant remember off hand what rpm that was but that was at a definate mid elevens AFR

Exactly, you werent running 1.5 bar at 6800 rpm so you cant expect a higher peak power figure. All you've done is bumped up the areas of the graph below that.

Luke the SRR fuel trace went up to 13.4 at redline not 15.8, otherwise I'm pretty sure the operator would have stopped the run!

Leaning off the fueling can have a significant impact on power especially at the top end where headline power is created. If you were doing a quick sprint or running up the dragstrip then I would be quite happy to lean it out for more power, but as a day to day road car that you might also take on the track, no chance.

old graph = as i state above 334.9bhp tb exact at 6800rpm running 1.35bar and about 1.1/1.2redline

saturdays graph is at 1.5bar 338bhp at rpm ?? as cant find my graph ash p will have copys soon tho, and still holding 1.2/1.3bar at redline. but i know saturdays run was at perfect afr.

im pretty sure people are not quite gettin my point as to why im a bit confused.

I am perfectly happy with my new wether it be pessimistic because of what dyno it was or wasnt. as i know it was fueling perfect for 1.5bar boost. Yet im abit concerned to exactly how the cars map was at the time of it making 335bhp 303lbs & 300wbhp on a PT map on a dyno bynamics RR only at 1.35bar. Flea understands where im coming from with my point and im not upset in anyway becuase i didnt get a silly PUB bhp figure i can assure you.

im thinking to make more power from x boost setting if you lean the fueling out a bit etc it will make more power right? or am i not and way off? like when ur running rich you will more than likely be down on power as i was when it got rr'd before xmas when running very rich.

do i make sense?

Surrey Rolling Road - Cracked Manifold - Incorrect AFR Reading.

Nobody knows what the AFR reading was at PT, i trusted them to map it safely and as far as im concerned it was fine.

yes ruben thats very clear to what the situation with the car was mechanically at the time of the RR but as said the afr reading is very high and has been discussed in another thread that even with cracked manifolds etc people havent seen THAT much of a difference on there afr readings.

nobody does know the afr when pt originally mapped it thats why im asking these few questions. as to wether it was mapped aggressively to put out the 335bhp at 1.35bar is what im trying to get rough idea of.

APOLOGIES flea is rite miss read the graph even i thought surely that wasnt rite but still 13.4 is very lean

You'll probably never know, but it doesnt matter as long as it's still in good health and is now running safe AFR's

just 3 bhp more beetween 1b35 and 1b5?

No, it doesnt hold 1.5 bar until 6800rpm, the boost will be about the same by that point. Should have bumped up the graph somewhere in the middle though. the peak power figure doesnt tell the whole story.

Luke, the reason why your car made more power with the PT map and less boost is practically impossible to answer

As Flea has said before, its a road car and he maps them like that, Rob may look at it differently, i dont know

its more than likely down to a conservitive and safe map and there is nothing wrong ith that

i do know that if you go to lean you actually loose power and if to rich the same so its a ballancing act

13.4 AFR is very lean and i would say that at that point you would loose power not gain it

maybe Flea can elaborate on this and explain what performance differences he has seen with different AFR's and where the point is that you start to loose power, as he is the man doing the mapping so he should know

a few skylines that i have worked with are running leaner than your setup and have been for a very long time without any problems but its difficult to compare engine to engine as it seems safe in some and not in others, this is where experience counts and and im afraid i have not mapped a coupe so my knowlege of AFR's on a coupe are limited

In what way did it make more power Tricky, 290bhp on a Dastek dyno was the most recent power run with the PT map? I can't remember the wheel power though

Sorry, i was under the impression that the car made more power, i thought it was 338BHP, TBH im getting a bit confused with all these figures now, theres just to many flying about