What is the main problem with running this kinda boost? Is it the heat thats generated? If so, if the mixture (afr) is rich enough, would this eliminate the problem?

Say for instance the coupe was running 1.5 bar with 10.3-10.5 afr. Would this be safe to do so?

Ross

I guess flea may be your best bet for this info? He is the only one I have seen run over 1.5 bar (1.7 in 3rd I think???)

If the car hasn't been mapped for it, then dont use it as the ignition advance will be wrong and you can't detect for this, unless you're going to drive around with det cans on too!

But other wise, it would be fine to do as long as the turbo can produce the goods and you can cool the air enough to not run into det problems

i think aquamist is good to have if you are thinking of running 1.5bar.

i was running 1.55bar midrange when i got my car mapped at PT but then dropping back to 1.15 at the redline because the std injectors could get enough juice up...

I run 1.5 daily with no problems at all, now for 11.000 km

See i have plenty of fuel available midrange.... so it wouldnt cause it to run lean.

Ross

Stnd internals?

Ross

Forged pistons...
Also a GT2871 RS, I guess smaller turbos would cause too much heat at that range?

Hmmm.

Ross

Ross - GET IT MAPPED! .. else you'll blow it up and we'll all laugh and say we told you so. I can't believe how much your willing to risk given the state of tune/amount of effort put into it.

What am i risking? I know my fuelling is spot on and there is no det...

Ross

What happens if it gets warmer? How can you be sure it won't det then?

Well why would it? There isnt that much ignition advance and have felt no hesitation. Taking it on the rollers soon to check it.

Ross

why would it det if it's hotter outside? Is that the question?

No. Why would it det full stop..? Esp if the fuelling is richer than normal. If a good figure for safety is around 12afr running 11's is gonna be fine.

Ross

Running rich doesn't mean you won't suffer from det. You have to ensure the cylinder temps are sufficently cool.

Well extra fuel = extra cooling.

Running mid 10's cool enough?

Ross

WI maybe

Its cheaper to go rsr than that!

Ross

Lol.

too much fuel = bore wash.

Ross' paranoia now is at a record high Kenno.

Well too much = borewash
Too little = det.

So there is a balance to be had which i reckon is around 11's.

Ross

Dunno what your so happy about!!!

Ross

Sorry but since there is not (really) a rule of thumb can we argue that:
AFR around 11.5-12 and EGT < 900C @ 6K revs, around 1bar MEANS that there is definitely no detonation?

On my other car, X3 barge 2.0lt petrol crap/slow engine, I can hear it detting too often for my liking (especially on hot days) to the extend that I send the car back to the garage to get it checked, and they just redownloaded the ECU programme/code whatever. Made fcuk all difference though
BUT, I've never heard the 16VT detting. Is it me, or is it simply good anti-det properties/ECU safety sorting it out?
I mean could it be detting right now without me hearing it?

cheers

V.

I run 1.5-1.8 bar full tilt. But then I have loads of fuel and forged rods + pistons.

Standard pistons are as good as that french goal keeper...

Agreed x 2

Ross, fuelling isn't suffice, you need to know what the ignition advance is too! Why do you think when people mapping cars use det can's if they could soley rely on what the wideband sensor tells then?

The more iginiton advance you at higher boost, the more chance of det you have. In general the more boost you run, the less advance you use. If the car / chip hasn't been mapped to run 1.5bar then the ECU will determine what advance to use from certain values, which could be too much and you wont know that, because you are not using det cans.

Also det can occur because the timing is ignition is firing before TDC, hence the pinking you can get (same thing, different name) and you can not always hear it either.

Ross, please, get the fu*king car mapped and stop pushing the car hard, because it will end in tears

agreed x 3

If making sure there was enough fuel was all there was to tuning, then PT would be out of business tomorrow

There are so many factors to a) getting the best from an engine and b) stopping it turning into a pile of scrap very soon afterwards

Currently, you haven't done a) and if you keep going, you'll arrive at b) very soon

Hmmm, well I actually wouldn't have a problem with running 1.5bar on a G-Tec II chip if you know the fuelling. On a 28R you can run this midrange and tail it off towards the redline. The ignition advance is not that great on the G-Tec II, certainly not enough to cause a problem if you are running high 10s or low 11s. Most coupés will run at 11.8 to low 12s when on full boost. By dropping to low 11s you can get a significant increase in timing therefore I would be very confident that you won't experience any form of detonation on the G-Tec II ignition maps.

Of course, this is my opinion on what I would do if it was my car and I knew the exact fueling...