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SVTPerformance's Chain of Restaurants
Road Kill Drive-Thru
450hp cam only ls1
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<blockquote data-quote="300bhp/ton" data-source="post: 4311522" data-attributes="member: 37151"><p>In short YES it's true. Although 450rwhp from cam only is a SERIOUS cam and on the verge of not being streetable for most.</p><p></p><p>But 400rwhp is quite common cam only. And bigger numbers for h/c setups. TSP MS4 cam and Terminator heads with usual supporting mods made 485rwhp on pump. This is considered by most to be budget heads.</p><p></p><p><strong>However, there is a catch. Dyno numbers are hardly accurate and should never be directly compared. Example:</strong></p><p><strong></strong></p><p><strong>Dyno type, this has a major affect on HP numbers although the car engine is just as powerful. This is how the numbers are derived and generated. Most Dynojets are interia dyno's which use a static drag weight. These are the most common dyno in the US. And they will generally give comparitivly high dyno numbers compared to manufacturer claimed numbers. Hence everyone is always convinced ALL Termintors, Mach 1's and even PI GT's are underatted. They are NOT. Well not by the numbers people claim.</strong></p><p><strong></strong></p><p><strong>Example - 450rwhp Dynojet is about the same as 420rwhp on a Mustang Dyno.</strong></p><p><strong></strong></p><p><strong>Mustang Dyno's are load bearing dyno's and thusly more accuratley respresent manufacturer claimed SAE Net figures.</strong></p><p><strong></strong></p><p><strong>And it is primarly this reason that ALL cars seem to have a 20-25rwhp variance as a general rwhp number when people ask what should my car make stock. It's all down to dyno types.</strong></p><p><strong></strong></p><p><strong>Then we move onto correction factors. STD and SAE. This can easily influence the numbers by another 20rwhp in some circumstances. STD will give the HP the car is making at that precise moment. So hot weather will be lower STD HP and cold weather higher STD HP.</strong></p><p><strong></strong></p><p><strong>Even 1 hour later can dramitically affect STD numbers which means they are pretty pointless for comparisons sake. Only a few degrees difference in ambient tempt or engine temp can make a whole difference.</strong></p><p><strong></strong></p><p><strong>SAE this "should" mean that the HP numbers have been corrected to a set standard, there is more than one standard out there, but in general terms it removes the variation as found by using STD numbers.</strong></p><p><strong></strong></p><p><strong>So the same car may dyno 2 days apart and produce 20rwhp variance in STD but once corrected to SAE there may be as little as 0.5rwhp variance.</strong></p><p><strong></strong></p><p><strong>So when used correctly SAE numbers will not care if its freezing outside or 90 degrees, it will return an almost identical HP number for both situations. Sadly this can be used to cheat the system though and when used incorrectly can dramatically affect the numbers.</strong></p><p><strong></strong></p><p><strong>Lastly is a thing called graph smoothing. If there is a lack of graph smoothing the PEAK numbers will be calculated from "false" spikes in the graph. This can lead quite easily to 5-20rwhp too high results.</strong></p><p><strong></strong></p><p><strong>So in total it is theoretically possible to have 60rwhp too high from a dyno!!!!</strong></p><p></p><p>But the above allpies to all dyno numbers. So if you yourself dyno'd on a Dynojet it's certainly food for thought.</p><p></p><p>If you want to see more info on what LS1's can acheive n/a go to <a href="http://www.ls1tech.com" target="_blank">www.ls1tech.com</a> and have a look in the Dyno forum and the internal engine forum.</p></blockquote><p></p>
[QUOTE="300bhp/ton, post: 4311522, member: 37151"] In short YES it's true. Although 450rwhp from cam only is a SERIOUS cam and on the verge of not being streetable for most. But 400rwhp is quite common cam only. And bigger numbers for h/c setups. TSP MS4 cam and Terminator heads with usual supporting mods made 485rwhp on pump. This is considered by most to be budget heads. [b]However, there is a catch. Dyno numbers are hardly accurate and should never be directly compared. Example: Dyno type, this has a major affect on HP numbers although the car engine is just as powerful. This is how the numbers are derived and generated. Most Dynojets are interia dyno's which use a static drag weight. These are the most common dyno in the US. And they will generally give comparitivly high dyno numbers compared to manufacturer claimed numbers. Hence everyone is always convinced ALL Termintors, Mach 1's and even PI GT's are underatted. They are NOT. Well not by the numbers people claim. Example - 450rwhp Dynojet is about the same as 420rwhp on a Mustang Dyno. Mustang Dyno's are load bearing dyno's and thusly more accuratley respresent manufacturer claimed SAE Net figures. And it is primarly this reason that ALL cars seem to have a 20-25rwhp variance as a general rwhp number when people ask what should my car make stock. It's all down to dyno types. Then we move onto correction factors. STD and SAE. This can easily influence the numbers by another 20rwhp in some circumstances. STD will give the HP the car is making at that precise moment. So hot weather will be lower STD HP and cold weather higher STD HP. Even 1 hour later can dramitically affect STD numbers which means they are pretty pointless for comparisons sake. Only a few degrees difference in ambient tempt or engine temp can make a whole difference. SAE this "should" mean that the HP numbers have been corrected to a set standard, there is more than one standard out there, but in general terms it removes the variation as found by using STD numbers. So the same car may dyno 2 days apart and produce 20rwhp variance in STD but once corrected to SAE there may be as little as 0.5rwhp variance. So when used correctly SAE numbers will not care if its freezing outside or 90 degrees, it will return an almost identical HP number for both situations. Sadly this can be used to cheat the system though and when used incorrectly can dramatically affect the numbers. Lastly is a thing called graph smoothing. If there is a lack of graph smoothing the PEAK numbers will be calculated from "false" spikes in the graph. This can lead quite easily to 5-20rwhp too high results. So in total it is theoretically possible to have 60rwhp too high from a dyno!!!![/b] But the above allpies to all dyno numbers. So if you yourself dyno'd on a Dynojet it's certainly food for thought. If you want to see more info on what LS1's can acheive n/a go to [url]www.ls1tech.com[/url] and have a look in the Dyno forum and the internal engine forum. [/QUOTE]
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