LIL has full boost and full revs

[Diver944]

Scott it doesn't use the O2 sensor on mine because I don't have one. If you have an O2 sensor it does use it to give you an idea of where you are when tuning and it is easy to see from within the Vitesse software exactly where you need to be leaner or richer. I have a Wideband sensor which is much more accurate but is not tied into the Vitesse software so you have to log a run on the Wideband, study the results and then apply changes to the Vitesse. It sounds 'bitty' but in practice is very simple.

This is a picture of the Map screen. Again it looks confusing but once you see it in action with the car running it is very simple. The deflection scale along the bottom shows the air being measured by the MAF according to your throttle position. The scale up the RH side is the RPM range that you are currently at. As you drive along a red cursor moves around the cells and you just increase or decrease the fuel in each cell until the Wideband reads what you want it to.

On a WOT run the cursor moves almost straight to the 75% column and climbs up that side to max RPM. On a part throttle or cruise mode it hovers around the 4 cells slap bang in the middle of the grid. My next step is to tune those cells so that I get a fuel effecient 14.5:1 during 'normal' driving []

 

[John Sims]

Oh! Suits you Sir!

You need to be topping up those high rev low load cells to help produce a few flames - I mean dump in a bit of fuel to cool the bores. []

 

[Diver944]

That's funny. I was watching my Bedford video earlier today and AndrewS car chucked some flames out the back and it immediately made me wonder what would happen if I altered the top right Full Throttle cell at 6500 revs to +25 for fuel

 

[Indi9xx]

"He who goes looking for flames will find flames. But he will also find trouble soon after."
(Made up proverb Jon Michell)

 

[Diver944]

ORIGINAL: Indi9xx

"He who goes looking for flames will find flames. But he will also find trouble soon after."
(Made up proverb Jon Michell)

I like that one Don't worry Jon I'll only increase it to +20 []

 

[pauljmcnulty]

But, following WUF through the Hatfeild tunnel the flames melted the paint on my badge panel and filled the stonechips.

Possibly a new sideline? []

 

[333pg333]

ORIGINAL: Diver944

Scott it doesn't use the O2 sensor on mine because I don't have one. If you have an O2 sensor it does use it to give you an idea of where you are when tuning and it is easy to see from within the Vitesse software exactly where you need to be leaner or richer. I have a Wideband sensor which is much more accurate but is not tied into the Vitesse software so you have to log a run on the Wideband, study the results and then apply changes to the Vitesse. It sounds 'bitty' but in practice is very simple.

This is a picture of the Map screen. Again it looks confusing but once you see it in action with the car running it is very simple. The deflection scale along the bottom shows the air being measured by the MAF according to your throttle position. The scale up the RH side is the RPM range that you are currently at. As you drive along a red cursor moves around the cells and you just increase or decrease the fuel in each cell until the Wideband reads what you want it to.

On a WOT run the cursor moves almost straight to the 75% column and climbs up that side to max RPM. On a part throttle or cruise mode it hovers around the 4 cells slap bang in the middle of the grid. My next step is to tune those cells so that I get a fuel effecient 14.5:1 during 'normal' driving []

Paul, I'm pretty sure you can connect your Wideband up to the Vitesse software too and datalog straight into it unless I'm mistaken?

 

[eastendr]

Flames are good.

 

[333pg333]

Great Photo Rick![][][]

 

[Indi9xx]

Indeed a great photo Rick!

Anyone know anything about that car? It has a turbo badge, but if its a turbo, it has some wacky exhaust on it.. Normally the left hand pipe is a wastegate pipe... In fact, it kinda looks like a H&S non turbo exhaust, almost like a H&S 993 non turbo exhuast.. but its a 3.2 Carrera wide body or turbo body... Quite a puzzle.

 

[Fen]

From the colour it looks a lot like a 930 I was going to look at for sale but bought the 964 before I got to it. I don't remember the reg of that car, but if it's the same it was a 3.5 conversion of a 3.3 with a big turbo and loads of other work carried out by someone like RSR over a period of 2 or 3 years by the owner before the one who was selling it. It had Fuchs when I was considering it so it may be a different car, but wheels are easy to change. It had a plate that could have been that one on it - certainly something similar to hide the age as I recall - but it looks like I didn't keep the Pistonheads pics so I can't check.

edit - Scratch that. I found a few pics the guy emailed to me and it isn't the same car.

 

[Brett928S2]

Hi All

Just read this thread with interest

Some impressive figures on high boost ...

On the subject of G-Tech meters....I bought mine for testing my Nitrous system....I have the top of range RR version and it is VERY accurate with times...0-60 and 1/8 and 1/4 times BUT it is famously inaccurate for hp figures...on mine....when I had just done a rolling road at 387 hp it SAID I had 210 hp lol

They all (every version) UNDERREAD on hp readings , even when car is weighed accurately on a weigh bridge.

As a guess ...take the hp reading it gives you and ADD between 20% and 30%...they NEVER overread...just under...

Hope this helps

This is an interesting forum....off to read other threads now

And hi Jon

All the best Brett

 

[Diver944]

Thanks Brett, I've been following your project with interest too and I know you are going to have waaaaaay more traction issues than I have been having [8D]

The thing to remember is that the Gtechs measure rear wheel HP and not flywheel (though this still doesn't explain your 210 to 387 difference []) but they are only really useful in providing a comparison between alterations.

I do know that back in December my Gtech measured 297 RWHP when I was at 15 psi and the original airflow meter. When Weltmeister measured it a shortwhile later it came back with 337 BHP at 15psi and 348 BHP at 16psi so if you allow an approximate 15% for drivetrain loss it is definitely within a few percent (which is pretty good for my £20 ebay purchase [])

When it is dry again I will get some more Gtech measurements now that we are fully mapped, have deleted the AFM and are able to hold a level 18psi boost.

 

[Brett928S2]

Hi Paul

I was in contact with the maufacturers of the G-Tech....even they admit the hp readings are a little suspect lol...

But I have found the other readings...such as 60ft times...0 to 30, 0 to 60, 0 to 100 are very accurate.

Yes I have massive traction problems that hopefully my new Maxx Race controller will cure...the controller can feed in the extra power SMOOTHLY ...so in theory at least ....I could possibly eliminate traction problems totally...

I have already moved up from 7 x 16 wheels to 10 x 18s from a 996...didnt help much lol..

In process on wiring it in at moment so will let you know...

Once its in and I have run some G-Tech runs, it will be interesting to compare my Nitrous G-Tech runs with your Turbo ones...



All the best Brett

 

[eastendr]

I've also got a lot of experience of the G-Tech RR and found it to be within a few percent of the Weltmeister figures.

Operator error ?

 

[eastendr]

ORIGINAL: Indi9xx

Indeed a great photo Rick!

Anyone know anything about that car? It has a turbo badge, but if its a turbo, it has some wacky exhaust on it.. Normally the left hand pipe is a wastegate pipe... In fact, it kinda looks like a H&S non turbo exhaust, almost like a H&S 993 non turbo exhuast.. but its a 3.2 Carrera wide body or turbo body... Quite a puzzle.

Thanks, Jon.

The car is a 3.3 turbo with Bosch K running higher boost.

 

[Brett928S2]

Hi Rick

I doubt its me lol...there are a lot of G-tech forums...they all say forget the hp figures as too inaccurate....

Umm...I have also run mine at Weltmeister...and was not very happy with the figures produced there (they were too high)....I then ran mine on another RR with same make of dyno and got different figures...Dyno dymanics (manufacturer of the dyno ) were meant to be investigating the difference but never came back to me after I provided the 2 sets of dyno charts....

Just my opinion...but personally I wouldnt run mine there again.....

All the best Brett

 

[Neil Haughey]

Engines power output is accurately measured on engine dyno's not chassis dyno's. It surprises me how for some reason a particular chassis dyno at a particular outfit not a million miles from bridge corner Silverstone has gained this halo. Maybe for some the fact that they have got lower readings then on another outfits dyno makes them believe that this is a true indication of power output.

 

[eastendr]

ORIGINAL: Neil Haughey

Engines power output is accurately measured on engine dyno's not chassis dyno's. It surprises me how for some reason a particular chassis dyno at a particular outfit not a million miles from bridge corner Silverstone has gained this halo. Maybe for some the fact that they have got lower readings then on another outfits dyno makes them believe that this is a true indication of power output.

Perhaps a look at the client list ...

 

[Neil Haughey]

Sorry Rick this is an engineering statement of fact not a pop at those guys. I am sure if you ask them is an engine dyno in a properly set up engine test cell more accurate then their chassis dyno they will tell you, well of course it is. I am not going to disagree that based on what can be found on the internet they probably have about the best reputation available to those of us who require the use of a chassis dyno.