Building the supercharger to the engine (75 3.0V6)

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Re: Building the supercharger to the engine (75 3.0V6)

Post by fedezyl » Tue Mar 22, 2016 3:40 am

Cool, great! I'm using high lift cams too, from RJR, the coil i'm using is the VR6 coil, what injectors are you using?

please send those maps yes, fedezyl at gmail dot com
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Mon Jun 13, 2016 10:05 am

Dyno results 8) .
310hp and 420nm. 345 form 2000rmp
Could be a little more hp from 5500 and upwards if i run it on 98octane but you can't get it everywhere and 95 is a lot cheaper.

Image

Verry happy with the torque everywhere! :lol:
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Re: Building the supercharger to the engine (75 3.0V6)

Post by fedezyl » Mon Jun 13, 2016 3:13 pm

Nice!! Were the ignition maps I sent you any helpful??
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Re: Building the supercharger to the engine (75 3.0V6)

Post by Duk » Mon Jun 13, 2016 3:55 pm

Excellent end results. That high average torque will have the car being effortlessly fast.
I take it the dyno/computer is calculating that at the engine/allowing for drivetrain loss? Correction Method: DIN
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Mon Jun 13, 2016 10:34 pm

@ fedezyl:

I used your, 3.0 original map, for the lower map range but it did have to much advance. My one where actualy pretty good on high map and a little worse on low map when i saw what the dyno guy made of it.

@duk:

That's engine numbers with an 13.5 drivetrain loss.
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Re: Building the supercharger to the engine (75 3.0V6)

Post by 75evo » Tue Jun 14, 2016 12:00 am

Great low RPM torque, But why is the drop in torque so drastic? I'm guessing a fixed cam timing is one of the reasons for this?
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Tue Jun 14, 2016 12:40 am

Drastic... it's still 360nm at top rpm. But i got a little detonation problems above 5500 that's why ignition was pulled in this range. Mr dyno sad it could make more on 98 octane, about 320hp, but i decided i don't want to because of the high price and you can't get it everywhere. It's also a supecharger setup so it's not as efficient as a turbocharger in the high rev range.
Gonna make some ducting for the intercooler and hope that i can pull of more intake air temp degrees so it doesn't take of one degree timing as it did while dyno testing. There should come some more hp.

Also i have a small restriction somewhere in the fuel delivery. Not that it cost any HP becuase it is compensatet in the fueltable, but annyone know where i have to search.
A good fuelpump is already installed.
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Re: Building the supercharger to the engine (75 3.0V6)

Post by Jim K » Tue Jun 14, 2016 3:04 am

Very good results for the setup! Torque at lower rpm is excellent for driving around! 8)
If you have a Bosch 0580254909 or 0580464126 fuel pump you shouldn't have any problems up to ~400hp. The factory fuel lines should be enough for your application.

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Re: Building the supercharger to the engine (75 3.0V6)

Post by fedezyl » Tue Jun 14, 2016 3:33 am

gtv-racer wrote:@ fedezyl:

I used your, 3.0 original map, for the lower map range but it did have to much advance. My one where actualy pretty good on high map and a little worse on low map when i saw what the dyno guy made of it.

@duk:

That's engine numbers with an 13.5 drivetrain loss.
Great! I dynoed my car a bit last time I was home but didn't get too good results as we discovered an exhaust leak and therefore the o2 sensor was misreading... if you can, send me the ignition map, it would be very helpful to tune after the SC is installed.
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Tue Jun 14, 2016 9:06 am

Tanks Jim. The dyno guy sad the fuel pump supports 600hp. Then something else is blokking it. Maybe dirt in the filter... only had the prolem last time. Never seen it before.

Fedezyl, i'll sent you the maps these days.
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Re: Building the supercharger to the engine (75 3.0V6)

Post by Jim K » Tue Jun 14, 2016 10:33 am

The sure way to conclude the entire fuel system is up to the task, is to measure pressure AND flow at the same time. There are instruments for this and the test can be performed with the engine off -by powering the pump. The setup uses a pressure gauge and a flowmeter. You restrict fuel return until the gauge shows ~3bar +max boost pressure, at which point flow should be ~25% more than what is required for your max power.

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Re: Building the supercharger to the engine (75 3.0V6)

Post by fedezyl » Tue Jun 14, 2016 4:31 pm

gtv-racer wrote:Drastic... it's still 360nm at top rpm. But i got a little detonation problems above 5500 that's why ignition was pulled in this range. Mr dyno sad it could make more on 98 octane, about 320hp, but i decided i don't want to because of the high price and you can't get it everywhere. It's also a supecharger setup so it's not as efficient as a turbocharger in the high rev range.
Gonna make some ducting for the intercooler and hope that i can pull of more intake air temp degrees so it doesn't take of one degree timing as it did while dyno testing. There should come some more hp.

Also i have a small restriction somewhere in the fuel delivery. Not that it cost any HP becuase it is compensatet in the fueltable, but annyone know where i have to search.
A good fuelpump is already installed.
When I had my 33 16v with megasquirt I had the same problem, ran out of fuel at 3bar so had to up the base fuel pressure. Symptoms where the same, couldn't control fueling at high rpm's. You might want to check the fuel pressure regulator, it may not be rising the pressure enough on boost, also a partially clogged fuel filter. I do think that torque drop is pretty steep too.
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Wed Jun 15, 2016 12:26 am

If the fuel delevery is sqeezed somewhere i think it would be somewhere in my home made parts or fuel filter.
A measurement would be nice but i don't have this equipment available...
Fuel preassure is already raised to 3.5bar with an oem porsche regulator.
The toque drop has nothing to do with the fuel delivery. The fuel table is a bit raised but no more than at top torque figures and afr's stay in check at around 12:1.

Maybe Greg can chime in and say something about the torque curve...?

Maybe i see things wrong...?
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Re: Building the supercharger to the engine (75 3.0V6)

Post by Duk » Wed Jun 15, 2016 1:19 am

Unless there is a either the drive belt is slipping of there is a boost leak, I'd say that the torque curve looks normal. It's a positive displacement supercharger, so the whole thing is really just going to act like a larger capacity version of the same engine.
So basically what ever would limit the engine ability to continue increasing its torque output at 'X' RPM when it's normally aspirated, will pretty much be the same now that it's supercharged.
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Re: Building the supercharger to the engine (75 3.0V6)

Post by gtv-racer » Wed Jun 15, 2016 3:13 am

That's what i tought. Belt isn't slipping. Boost risses normaly tipicaly for a supercharger as rpm increase. The only slight thing that there could be missing some hp is the air temp timing retard and the 98 octane thing i guess.

But suggestions are always welcome beuase i'm just a rookie tuner :wall:
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