Hi all,

Just been to perfect touch,

Rob was very helpful and Claudio was very enthuisiastic about his live mapping!

I had a Fuelling check done with the Gtec 1 set at 15PSI which is just over 1.05 Bar(although it showed as slightly higher boost on the rollers)

Rob said that the engine was good and fuelling was spot on. but he heard slight pinking over 5,300, therefore he couldn't take it any further up the rev range or adjust for higher boost.

He said that my main problem was that I should be using a higher octane as I currently use 95ron and the ECU is pulling back the timing at high revs.

He also said using V power or Tesco 99Ron could yeild a 10% - 15% increase in performance and allow slightly higher boost to be run.

All in all I'm very happy that I have a reliable engine and that I had it checked at this stage before I did any major modifications.

With Perfect Touch I found them very helpfull and would highly recommend them.

I have posted the graphs, How do they look in terms of the general output curve?

Regards

Austin

One

Two

Spool up is good with the usual gtech chip dip

Torque looks flat aswell which is good.

Afr is too lean at 13.5-14 afr at 3k-3.5k.

All in all, that car will feel really quick to 5k, but if rob says you should run higher octane fuel, then i would do so and take it back for another test.

Ross

They said the fuelling was spot on?

Maybe I'm wrong by thinking it looks a bit out then

That would be lean going on the feedback I had from my RR at Weston. Putting in the GTech2 sorted it for me, but I did have a few more mods at the time. Funny, mine started rich but grew leaner with revs, yours is other way round? Maybe the Walbro is the difference? Someone will enlighten us shortly Im sure!

Given your mods, those graphs are spot on. Lovely early peak in torque - held well.

Smooth power graph - no big peaks (or dips)

For an everyday Coupe, it must feel nice to drive. Being able to run on 95RON is an advantage, not a disadvantage.

I would suggest that Rob's recommendation is spot on - it you want some cheap power, use 99RON and let the turbo boost a bit harder for a bit longer.

PS - I agree with Chrisbp - the stock fuel pump (especially with the stock electrics) could easily be causing the leaning off at the top end - do the direct electrical feed mod, if only for the peace of mind that your pump is getting 12v instead of the usual 9v - 10v

James (jap) does a dedicated wiring kit quite cheaply

Thanks for your comments,

I think the wiring mod is a must, as is giving the car the 99Ron fuel it deserves.

Now this is probably be me being a numbnuts but the main surprise to me was that the Gtec 1 was not mapping enough fuel before the level at which it is designed to run at (1.2bar)

I guess it must be a function of lack of voltage + 95ron causing the leaning in the range and not the fault of the chip?

Austin

If you're only running 1.05bar you might be better off with the standard chip, on my car at least it was richer than the GTEC1 at this boost level.

Only 25bhp loss on the running gear is really good - right?


A question.
I heard that to get the most power you would run the lowest octane petrol (i.e. the one that ignites the easiest) possible for you setup to prevent pinking thoughout the rev range. Don't know if this is correct, but if it was, this would mean trying any other supermarket 'super' unleaded fuels initially other than Tesco as they are all 97RON. If 97RON still produces pinking, then move to the Tesco 99RON.
The above paragraph could be total kack though. Anyone have any ideas on this?

yup, it is

Hi Austin,

I had almost identical results to yours on Saturday at PT. Ill post a thread up tomorrow when I can scan the graphs it will be interesting to compare. I also only hit 220bhp, and Rob told me the BP ultimate that I filled up with specially isn't helping and that I should use 'proper' super unleaded!!

Think im also going to do the fuel pump mod.

I wonder how they can tell the ignition is being retarded?

Cheers

W

Lots of flawed logic there.

Fuel + air = power. The more of one you can add, the more of the other you can add to utilise it.

So your car is only running the turbo at 1.05bar but its using all the available fueling (and octane). Increase the octane and you can add more air (via turning the boost up) thus giving more power. Other option would be to do the pump ungrade and keep to 95ron, but personally I'd do both! ie always run on super.

I think what your statement is implying is that running on the verge of lean does give the most power - but also not good for the life of your engine... running rich is safer, but costs power / advance etc.

What you ideally want to do is have more air + more fuel and have it mapped properly. Should easily be able to see 270bhp without changing the turbo

slightly flawed logic

Increasing the RON gives you more resistance to detonation / knock, so you can advance the timing more thus giving you more power

But its ok begbie... cause fergie can have me in a fight... and his mate thinks im a tw*t, which makes it ok aswell.

Ross

Well I can certainly vouch that changing to 99 RON has made a difference in my car. Well of course its always hard to tell but dont remember having quite so much wheelspin on BP ultimate!

Have you got your graph to post up yet Warnysouth?

Cheers

Austin

Its up now. W

Is your AFR not way too lean

Correct.

Ross

Mine?

What should AFR graph look like ?

I'm wondering if turning up my boost slightly now to 1.1 Bar may cure the leaning? I have been told that the Gtec1 has two maps for fuel, could it be possible that it is running it's 'low' map as it's designed to run higher boost and mine is at 1.05bar?

I'm also running 99Ron now.

Austin

As far as I know on boost it should be in the 11s leaning out to low 12s (12.1 or so) at the top. Although, as said above, if you're running low boost you *might* be able to get away with it being a bit leaner. I know my car is mapped to run leaner at lower boost.

Does this mean that if you have a cr@ppy old engine that you suspect is running a bit lean, it could simply compensated for by using a higher octane fuel i.e. there would be more carbon to react with the oxygen, therefore less air rich running. Not that this would necessarily be the way to go, but would help my understanding of the way the octane in fuels works.

Is this the same for NA and turbo engines. i.e. do you need to apply slightly different priciples when modding the coupe turbos compared to the slower coupes?

The crappy old engine would still run lean if you added 99RON as normal, it wouldn't make any difference to running lean or not. To make any difference with 99RON, you would need the car to be re-mapped. The ECU can not adapt to what fuel is being run (later ECU's like Golf GTI Mk5, impreza's etc..) can adapt to what fuel you can, the 16vt or 20vt' can not!

Turbo engines in general, need to run slightly rich when on boost, as the extra fuel acts as a coolant on the pistons to keep the temp down due to the temps that get generated with a turbo engine, non-tubo engines can run a leanier mix