Hp/tq gain question.
11-08-2013, 09:28 AM
#46
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Personally, I think you guys are very optimistic... I've dyno'ed several turbos, and found that a stock car will make about 200 WHP. You can see on this chart that it took quite a lot of extra boost to make 250 whp (and that's a good running car (technoduck)).
FWIW, I've had nearly a dozen 951s on my dyno - all with different mods - and none have broken 300 WHP.
To the OP, I'd say you're at 200 WHP now, and with a chip - and your other stuff - you'll get up to 220 WHP.
FWIW, I've had nearly a dozen 951s on my dyno - all with different mods - and none have broken 300 WHP.
To the OP, I'd say you're at 200 WHP now, and with a chip - and your other stuff - you'll get up to 220 WHP.
Seriously - unless you have tested a lot of 944s keep away from 'guessing' at HP levels. Way too much SWAG numbers out there.
BTW - a K26/6 is capable of a lot of torque, it can make well over 20psi in the midrange RPMs. at the top end (RPM) it won't do well.
11-08-2013, 09:35 AM
#47
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This is a totally stock internal 944 turbo (my original 944 turbo). it does have many external mods - turbo, standalone, wastegate, blowoff, inetcooler pipes, injectors and some other details. But - the internals are stock as assembled by Porsche.
So, yes, you can make a little more than 200-250 on stock internals! BYW - this was on a Mustang Dyno - up to 10-15% lower than a Dynojet.
11-08-2013, 09:53 AM
#48
That's a good results. Afr around 12.5/12 which is prob why your making good power. Not rich for safety( error )
What turbo
What turbo
Last edited by t3rra; 11-08-2013 at 10:23 AM.
11-08-2013, 09:57 AM
#49
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I have done a lot of testing and the power does not drop off much as you add more fuel past 12:1. The cooling you get from vaporizing the extra fuel in the cylinder can help on an engine that is not well tuned - but the long term effects of running over rich is not good. Too much carbon build up and oil dilution.
11-08-2013, 10:13 AM
#50
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These were from 2010...
The green, technoduck's car, had quite a bit - certainly exhaust, chips, and so-on. I think he had a different turbo, too. I don't recall if he had the AFM or a MAF, thought.
The red was a 100% stock car.
And the blue was my turbo, which had chips, LBE and 3" straight pipe exhaust.
The green, technoduck's car, had quite a bit - certainly exhaust, chips, and so-on. I think he had a different turbo, too. I don't recall if he had the AFM or a MAF, thought.
The red was a 100% stock car.
And the blue was my turbo, which had chips, LBE and 3" straight pipe exhaust.
For what it's worth, here is the chart Van made up for me a few years ago. Same mods as Techno Duck, but a 2.5" exhaust at the time. At another dyno day, virtually every car with bigger turbo, exhaust, etc made within 10-15hp of these numbers.
11-08-2013, 10:28 AM
#51
If I recall correctly Technoducks car had a 60-1 turbo, MAF, exhaust, wastegate, and MBC - the usual stuff.
For what it's worth, here is the chart Van made up for me a few years ago. Same mods as Techno Duck, but a 2.5" exhaust at the time. At another dyno day, virtually every car with bigger turbo, exhaust, etc made within 10-15hp of these numbers.
For what it's worth, here is the chart Van made up for me a few years ago. Same mods as Techno Duck, but a 2.5" exhaust at the time. At another dyno day, virtually every car with bigger turbo, exhaust, etc made within 10-15hp of these numbers.
Looking at that chart looks like the 60-1 turbo might not be a good match. at 4700 for full boost
11-08-2013, 10:58 AM
#52
I have done a lot of testing and the power does not drop off much as you add more fuel past 12:1. The cooling you get from vaporizing the extra fuel in the cylinder can help on an engine that is not well tuned - but the long term effects of running over rich is not good. Too much carbon build up and oil dilution.
What cause the slight drop at the end? Is that fuel delivery? Or is that perpous part off the tune.
I can monitor my af via android app. What sort off figures do I not want to see on boost 10? 11?
11-08-2013, 11:37 AM
#53
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I don't know why the dyno shows the boost plot like that - I have 18 psi by 3,700 rpm according to my VDO boost gauge. I agree that I have exhaust leaks, but nothing too serious. I spent a bunch of money and time replacing the headers, crossover, crush rings, etc a while ago in an attempt to fix it, but it had minimal impact. The only spot that even leaves evidence of a leak in the whole system is the #4 exhaust header flange at the cylinder head...
https://rennlist.com/forums/944-turb...t-today-2.html