before and after HKS 272/272..DYNO
Dec 17, 2004, 08:09 PM
#1
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before and after HKS 272/272..DYNO
this was my results...more info on the set-up here...272s
https://www.evolutionm.net/forums/sh...d.php?t=113851
before:304whp
after:336whp
https://www.evolutionm.net/forums/sh...d.php?t=113851
before:304whp
after:336whp
Dec 17, 2004, 08:30 PM
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I have been waiting for a post like this for sometime now. If you could post up how car idles, and drives in the city with these cams. I cant believe you picked up 30 some horses, awesome numbers. These are going on my list of stuff to buy!!
Dec 18, 2004, 06:55 AM
#4
I don't think you can get 30+ hp just out of the cams alone, looks like the second dyno is done in a much cooler day. 20hp give or take is more reasonable. Nice number anyway!
Dec 18, 2004, 08:50 AM
#7
1) The stock cams started falling off at 7K and the 272's stopped going up at 7K. You can see them start to smooth out. No real reason to run higher.
2) The stock cam pull was done in July and the 272's were pulled in November. That would be about as big a temperature difference as you can get! I don't know how much temp can affect the EVO but my race car goes 10.6 in July and 10.3 in Feb. That's about a 30 HP loss in the summer. I know the HKS cams gained you more than 2 HP so I think the gains are in the middle. I think it makes more sense that the 272's got you 15-20 HP and the temp gave you the rest.
2) The stock cam pull was done in July and the 272's were pulled in November. That would be about as big a temperature difference as you can get! I don't know how much temp can affect the EVO but my race car goes 10.6 in July and 10.3 in Feb. That's about a 30 HP loss in the summer. I know the HKS cams gained you more than 2 HP so I think the gains are in the middle. I think it makes more sense that the 272's got you 15-20 HP and the temp gave you the rest.
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Dec 18, 2004, 01:19 PM
#8
Originally Posted by EVOTEXAS
1) The stock cams started falling off at 7K and the 272's stopped going up at 7K. You can see them start to smooth out. No real reason to run higher.
2) The stock cam pull was done in July and the 272's were pulled in November. That would be about as big a temperature difference as you can get! I don't know how much temp can affect the EVO but my race car goes 10.6 in July and 10.3 in Feb. That's about a 30 HP loss in the summer. I know the HKS cams gained you more than 2 HP so I think the gains are in the middle. I think it makes more sense that the 272's got you 15-20 HP and the temp gave you the rest.
2) The stock cam pull was done in July and the 272's were pulled in November. That would be about as big a temperature difference as you can get! I don't know how much temp can affect the EVO but my race car goes 10.6 in July and 10.3 in Feb. That's about a 30 HP loss in the summer. I know the HKS cams gained you more than 2 HP so I think the gains are in the middle. I think it makes more sense that the 272's got you 15-20 HP and the temp gave you the rest.
Keith
Dec 18, 2004, 02:22 PM
#9
Originally Posted by Fourdoor
Temp inside a shop may not make that much difference between summer and fall.... but the thing I noticed was the A/F ratio was running 10.5:1 in the mid range up to about 10.9:1 at 7000 RPM. In the new dyno sheet he is at a nice steady A/F ratio around 11.3:1 That makes a HUGE difference in power right there.
Keith
Keith
Dec 18, 2004, 04:42 PM
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The Evo's usually make peak power below 7K rpms. Especially with the stock turbo.. No need to spin up any further unless you want to tune past that or want to see how much it drops off. The Dyno should use a SAE standared correction for temperature and pressure. This is used to negate the affects of weather on the numbers for comparison purposes. Was this STD horsepower or SAE corrected on both charts?
Brian
Brian
Dec 18, 2004, 05:09 PM
#13
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Originally Posted by TURBODAWG
The Evo's usually make peak power below 7K rpms. Especially with the stock turbo.. No need to spin up any further unless you want to tune past that or want to see how much it drops off. The Dyno should use a SAE standared correction for temperature and pressure. This is used to negate the affects of weather on the numbers for comparison purposes. Was this STD horsepower or SAE corrected on both charts?
Brian
Brian
Dec 18, 2004, 05:15 PM
#14
I dont think people work in a shop that is 10 degrees... Im pretty sure no matter what the temp difference is most of that power is the cams... think about it... inside a shop in summer = temp of 90 degrees or so... winter... 65 (A cold shop)... probably more like 70.. and that is assuming they dont air condition thier shop in the summer.
Dec 18, 2004, 05:26 PM
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Since both runs were uncorrected, if Pruven still has the files then they can print the SAE corrected graphs and number from both pulls. Then you can compare "apples" to "apples". Evotexas is right, the weather and temperature play a huge part. My guess is the total increase in power will run about 20 whp after the cams after the SAE correction.
Brian
Brian