964 turbo increasing boost....dyno tests.

[Evo11]

Hello Guys, I will share with you reliable information about how the stock 964 Turbo reacts to increasing boost. The measurements were made on the Maha dynamometer and the measurement itself lasted about 20 seconds under heavy load, which is comparable to the conditions on the road of an accelerating car. The power measurements you do in America and which last 5 seconds are unreliable to me because they have nothing to do with real conditions and the load to which the car is subjected. Maybe it works for you because you simply don't drive at high speeds because you have nowhere to go, in Germany we drive these cars at 300 km/h and it takes a long time. Returning to the measurements, one measurement was made at 0.7 bar and the AFR at 6500 rpm is 12:50. The next measurement is 0.9 bar and above 5000rpm it is already lean. The next measurement is 0.98 bar and at 6000 revolutions the AFR is 13:50 which, as we know, is unacceptable. What's interesting is that this stock motor produces almost 580NM.
Despite air blowing onto the intercooler, with a higher boost the intercooler got very hot. Cooled cold water spray was also used for measurements

thanks
K

[Evo11]

[Evo11]

Here is dyno run of my ex 997 turbo from 2011. Compare it with dyno runs made in America.

https://youtu.be/pWbHzQ0uw_A?si=jPkRTuchC7MKnHrz

[slow&rusty]

Originally Posted by Evo11

. The power measurements you do in America and which last 5 seconds are unreliable to me because they have nothing to do with real conditions and the load to which the car is subjected. Maybe it works for you because you simply don't drive at high speeds because you have nowhere to go, in Germany we drive these cars at 300 km/h and it takes a long time.
thanks
K

I'm not sure where you driving at 300km/h in Germany, the Autobahn today is crowded and lots of traffic unless you are out driving at 2am.

Either way enjoy it while you can, the way European cities are trending...even walking with flip-flops on will be banned soon.

[patina]

I’ve never been anywhere where I felt the need to accelerate WOT for 20 seconds. Regardless, your results are silly considering the AFRs you hit to accomplish them. Not really impressive.

[Evo11]

In my car AFR is just fine considering boost im running

[Evo11]

[Evo11]

Going back to the topic rising boost to 0.9 bar is pointless in the stock car.

[Dr J]

First, thank you for posting the data. It's always good to have some real-world info on how the cars perform with modifications.

Second, excuse us here in the States. We're just slightly jealous that you can drive around at 300 kph and we can't.

[Tippy]

That’s why you ditch the CIS and go EFI. Limited power and safety potential with CIS.

[Evo11]

Originally Posted by Dr J

First, thank you for posting the data. It's always good to have some real-world info on how the cars perform with modifications.

Second, excuse us here in the States. We're just slightly jealous that you can drive around at 300 kph and we can't.

[Evo11]

Originally Posted by Tippy

That’s why you ditch the CIS and go EFI. Limited power and safety potential with CIS.

Sure but its about keeping those cars as stock as possible. But for high end project EFI is must have.

I will post soon dyno run of my car which runs only 0.85 bar boost from same maha dyno

[Ollies930]

Running a long dyno run, as compared to a shorter one, helps mask things like heavy engine or driveline components. Additionally, the only time you spend that much time in one gear, is potentially in top gear. That means you are ignoring all the gears below top gear. There is a reason why most dyno acceleration rates are set where they are. On most engine dynos you can set the rate of acceleration to what you desire, within reason, but you will find that the power levels will show an increase on the slower acceleration rates as opposed to the faster ones. And for tuning you want to get as close as possible to what the engine will see most of the time.

[Evo11]

If the engine does not generate any problems under such a heavy load in the highest gear, it means that there will be no problems in lower gears its simple.

Btw. All above cars measured on 4th gear. 997tt from the movie on 5th so non of this cars measured on highest gear

[Ollies930]

Originally Posted by Evo11

If the engine does not generate any problems under such a heavy load in the highest gear, it means that there will be no problems in lower gears its simple.

An accelerating engine (full load) will require more fuel than at steady state (full load). Therefore for tuning purposes an engine that accelerates quickly (as in lower gears) will be better tuned than going very slowly or steady state. If all you want to do is show hp, then it does not really matter.

[Evo11]

Originally Posted by Ollies930

An accelerating engine (full load) will require more fuel than at steady state (full load). Therefore for tuning purposes an engine that accelerates quickly (as in lower gears) will be better tuned than going very slowly or steady state. If all you want to do is show hp, then it does not really matter.

both of the best German tuners do things completely differently than you wrote. As I wrote earlier, a short measurement does not reflect what actually happens when accelerate on the road.

[krasuskyp]

Originally Posted by Evo11

Maybe it works for you because you simply don't drive at high speeds because you have nowhere to go

Nowhere to run WOT here in the US? Have you ever driven here?

I drive mine as fast as I fukkkin want - all day everyday all the time everywhere. 'Merca!

And why keep it as stock as possible? Short sighted IMO

13.5afr?? Um yeah no.

[Ollies930]

Originally Posted by Evo11

both of the best German tuners do things completely differently than you wrote. As I wrote earlier, a short measurement does not reflect what actually happens when accelerate on the road.

If they tune with a slow and steady acceleration rate on a rolling road dyno only, then they are far from the best tuners. Like I said, the only reason would be to show high hp numbers. I suggest you go back to those tuners and ask them how they tune for acceleration in lower gears and part throttle acceleration.

[Evo11]

Originally Posted by Ollies930

If they tune with a slow and steady acceleration rate on a rolling road dyno only, then they are far from the best tuners. Like I said, the only reason would be to show high hp numbers. I suggest you go back to those tuners and ask them how they tune for acceleration in lower gears and part throttle acceleration.

As you can see here on engine dyno they tune

[Evo11]

Coming back to the topic of increasing the boost in the 964 Turbo with original fuel systems, it simply does not make sense, and I have noticed that increasing the boost to 0.9 bar or even 1.0 bar is often the first choice.