Josh Posted May 15, 2007 Share Posted May 15, 2007 Just wondering if anyone knows what wastegate size vs max output of engine is? Eg, 38mm external good for 300hp etc (not true just an example). I have a 32mm one wondering how much HP its good to. Cheers Quote Link to comment Share on other sites More sharing options...
Gaz Posted May 15, 2007 Share Posted May 15, 2007 Doesnt really work like that. It kinda does but to a lesser extent. What you are better of to do is match the wastegate to the turbo size and boost you wish to use. For example. a larger wastegate is better for lower boost. A smaller wastegate is better for high boost. Hang on.. will find artical. Quote Link to comment Share on other sites More sharing options...
mikuni Posted May 15, 2007 Share Posted May 15, 2007 Thats right. Because the waste gate is venting exhaust gas around the turbo, so it doesn't overboost/spool what ever word you use. So a tiny wastegate won't vent enough gas and the turbo will go hard out. Will be good for millions of horsepower boe! But yeah, as methz said it needs to be suited to the turbo and engine. In most cases you shouldn't need an epic one. Especially not if using a pinto? Quote Link to comment Share on other sites More sharing options...
Josh Posted May 15, 2007 Author Share Posted May 15, 2007 Ah right, sweet cheers for that. Ive got a 32mm one here, so sounds as if that should be sweet for the turb pinto. Quote Link to comment Share on other sites More sharing options...
Gaz Posted May 15, 2007 Share Posted May 15, 2007 One of the most important components in a well designed turbocharged engine is a properly sized wastegate. Too small of a wastegate can cause boost creep while too large of a wastegate will increase boost lag and decrease performance. Our GReddy external wastegates are made from the highest quality materials to insure both stability and durability in a turbocharger's boost control. Each unit is adjustable as well as rebuildable. Available in 4 sizes and various spring rates. From 0.8kg/cm2 (11psi) to 1.5kg/cm2 (21psi) and up.To ensure the proper amount of control, choose a Wastegate that is suited to your Turbo's maximum boost level. Sizes of the housing are as follows: The GReddy Type S Wastegate (34mm) is intended for Turbo Systems Running 11-14 lbs of Boost. The GReddy Type R Wastegate (47mm) has three variations that range from 11-30 lbs of Boost. The Greddy Type C (47mm) and Type CH (56mm) can be used from 11-40 lbs of Boost. Quote Link to comment Share on other sites More sharing options...
Gaz Posted May 15, 2007 Share Posted May 15, 2007 ^^ Hrmm, that kinda contradaicts what I said im 99%^ sure what I said was right. Will look more into it. Id run and do run a 38mm. Its a good in between size for any street boost level really. Ive never heard of anyone running a 32mm before, thats small as. Quote Link to comment Share on other sites More sharing options...
Josh Posted May 15, 2007 Author Share Posted May 15, 2007 You measure the valve hole at bottom to get size of it right? Thats what I was told and it measured 32mm, seemed really small Quote Link to comment Share on other sites More sharing options...
Spencer Posted May 15, 2007 Share Posted May 15, 2007 Also what comes into it is more boost your running in theory your making more power hence more exhaust to bypass means bigger gate so the above quote is correct. Quote Link to comment Share on other sites More sharing options...
Gaz Posted May 15, 2007 Share Posted May 15, 2007 Here ya go. Good artical http://forums.performancecar.co.nz/phpB ... =wastegate 1. The wastegate size is relevant to how much horsepower you are targeting 2. If you want to run high boost, then a smaller wastegate is better than a larger wastegate. The idea being that in order to generate high boost you need most of the exhaust gas going through the turbine, not through the wastegate. 3. If you want to run low boost then a larger wastegate is better than a smaller wastegate. The idea being that in order to keep the boost low you need a lot of the exhaust gas going through the wastegate not through the turbine. Quote Link to comment Share on other sites More sharing options...
Gaz Posted May 15, 2007 Share Posted May 15, 2007 ^^ hrm.. Cant work his formula.. anyone else tried? Where he get the 19 from in his first formula? Quote Link to comment Share on other sites More sharing options...
escortman Posted May 15, 2007 Share Posted May 15, 2007 yeh it all depends on firstly how much power u want then u can work out wat turbo on wat boost achieves that then u work out ur gate size Quote Link to comment Share on other sites More sharing options...
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