[zagaone]

2019 GTS dyno results

Tune: APR 100 oct with downpipe
Gas: 100oct. +. (Mix of 104 Sunoco GT Plus & 93oct pump gas)
Temp.: 75*
Car modifications: 200 cel cat.

Run #3: Baseline, stock everything.

Run #1: APR 100 oct w/ downpipe tune; 200cel.cat.; stock PSE.

Run #2: APR 100 oct. w/downpipe tune; 200cel. Cat.; PSE mufflers/valve delete.

From baseline run for this particular Mustang dyno this car loses 20% hp and 10% tq. So run 2 equates to 443hp and 388ft-lb.

Car feels great. Very responsive and eager. Really fun now.

 

[HooosierDaddy]

2019 GTS dyno results

Tune: APR 100 oct with downpipe
Gas: 100oct. +. (Mix of 104 Sunoco GT Plus & 93oct pump gas)
Temp.: 75*
Car modifications: 200 cel cat.

Run #3: Baseline, stock everything.

Run #1: APR 100 oct w/ downpipe tune; 200cel.cat.; stock PSE.

Run #2: APR 100 oct. w/downpipe tune; 200cel. Cat.; PSE mufflers/valve delete.

From baseline run for this particular Mustang dyno this car loses 20% hp and 10% tq. So run 2 equates to 443hp and 388ft-lb.

Car feels great. Very responsive and eager. Really fun now.

What's with PR not being able to produce a clear dyno chart? Are all the dyno's there not working correctly?

You saying that the base line run is 20% lower than what it should be? With that I have two questions....

• Are you taking the second and third runs and adding 20% to come up with your peak figures?

or

• Are you adding the original 20% Horsepower loss to the second and third runs to come up with your peak figures?

However... numbers aside, the graphs do show an increase and reflects the benefit of tune and exhaust.

 

[zagaone]

I was referring to this particular dyno loss. The baseline read 292hp so ASSUMING the rated 365hp oem engine rating that is s 20% drivetrain loss on this particular dyno. It is a reasonable way of working engine hp based on rwhp.

This is the most conservative dyno. It is usually spot on.

 

[HooosierDaddy]

wait a minute... your profile showed Puerto Rico for your location, but now shows US?

20% loss is a lot for a mid engine car!

either way, the gains are there and really all that matters. What I find interesting is that the run with the PSE still in place is the best! That’s awesome and congrats on the new found power!

 

[Optical TDI]

Is there a 200 cell DP file for APR?

 

[zagaone]

Only the tune is APR. Cell is the insert from Fabspeed and the muffler delete is Soul.

The 20% loss reading is dyno dependant. It is based on the way this conservative dyno read.That is why you need to have a base line. On a as another dyno the drivetrain loss reading might be less.

 

[BudgetPlan1]

The 20% loss reading is dyno dependant. It is based on the way this conservative dyno read.That is why you need to have a base line. On a as another dyno the drivetrain loss reading might be less.

For the bench-racing afficianados, DynoJets are Dreammakers, Mustang Dynos are Heartbreakers

 

[zagaone]

The best run was with the muffler delete SOUL exhaust. Deleting the PSE catback actually increase hp by 12rwhp(15hp). 342rwhp(PSE) vs 354rwhp(muffler less). Still have to talk to ARP about the fluctuation on the mufflerless run. It might be that the ecu has not adapted yet to the freer flow since the dyno run was done right after deleting the PSE mufflers. If anything it will get even better.

When I first dyno the stock 718 GTS car, I was one of the broken-hearted. I actually thought something was wrong with the engine ( 292rwhp from an oem rated 365hp). But that is really how weak the car really felt to me, being used to high hp/tq cars. So deep down I knew this dyno was giving me an honest reading, no hype. No point in fooling myself with over rated dyno numbers.

In my opinion all these stories about Porsche widely under rating the 718 engine power figures is just wishful thinking. They might under rate by a few hp for tolerances and legal reasons. My real life experience and results are consistent with this statement. Also the results are consistent with APR and Heressmann power figures. Due to different dynos everyone starts at different number but end up somewhere around the individual dyno corrected figure of 420-430hp for a 93 oct. tune.

 

[HooosierDaddy]

I must have read the file backwards for the PSE, sorry.

 

[4ftw]

I must have read the file backwards for the PSE, sorry.

Glad I’m not the only one that’s confused reading through this thread.

 

[4ftw]

When I first dyno the stock 718 GTS car, I was one of the broken-hearted. I actually thought something was wrong with the engine ( 292rwhp from an oem rated 365hp). But that is really how weak the car really felt to me, being used to high hp/tq cars. So deep down I knew this dyno was giving me an honest reading, no hype. No point in fooling myself with over rated dyno numbers.

So you’re saying my stock GTS only has 292 hp? How would Porsche get away with that?

 

[HooosierDaddy]

So you’re saying my stock GTS only has 292 hp? How would Porsche get away with that?

Power to the ground! Maybe a little low, but it’s just a baseline

 

[purekoryo]

Kinda disappointed in your gains. I would've expected more, especially with the exhaust and race gas. What was the temperature and humidity? I assume they placed the fan in front of the side intake and not in front of the front bumper?

And even on a mustang dyno, those numbers are Really low. Were the other cars WHP proportionally low as yours?

 

[zagaone]

Yes, like I said at the beginning, this Mustang dyno readings ar very conservative. For this GTS and every other car tested there. No hype or ego enhancer dyno #s. Temperature in the high 70s, humidity: high.

The generally acepted standard drivetrain loses for a 718 is in the 12-15%. So a 365hp(flywheel) 718 GTS is generally regarded to have somewhere between 310-320rwhp(wheels). As stated above, in this dyno I got a baseline reading of 292rwhp(wheels) which results in exactly a 20% drivetrain loss factor. This does not mean this particular GTS has less power, it just means that to calculate the engine hp gains or losses resulting from modifications I need to use this dyno particular 20% loss factor. If I were to use another dyno I will have to go through the whole validation process again.

Have I not done the baseline dyno run and let myself be fool by the standardized 12-15% drivetrain loss factor I would have mistakenly concluded that all the modifications(tune, 200cel cat and muffler less cat back) were not really doing much. 354rwhp/1-.12= 402hp when the stock oem rating is 365hp. In reality the engine hp after modifications is 443hp(354rwhp/1-.20). A total hp gain of 62rwhp which again translate to 62rwhp/1-.20 = 78hp(flywheel). This does not mean that on other dynos this GTS will produce different numbers if those dynos have a different drivetrain loss % factor.

A 78hp gain for a total of 443hp(flywheel) is very consistent with APR and Heressmmann reported # for similar modifications. So I’m very happy with it.

 

[purekoryo]

Nevermind! I stand corrected.

 

[zagaone]

No they don’t. Look at the APR dyno chart for the GTS. They state a 65hp(flywheel not rwhp) max gain for 93 oct. and 70hp(flywheel not rwhp) max gain for the 100 oct. map. Plus APR #s are 4.66% high. Their dyno results came at base 482hp vs oem base of 365hp.

The GTS tested here with just a 200 cel cat. and the 100oct. tune gained 63hp(flywheel) which is a few hp shy of the APR results of 66hp (70hp * .95). Which is to be expected due to the high humidity here. With the mufflers deleted the gain was 78hp(flywheel). I guess the PSE mufflers are very restrictive or the turbo really like a free flowing exhaust system.

 

[zagaone]