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what valve springs you guys recommend?

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Old 11-11-2008, 07:06 PM
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Default what valve springs you guys recommend?
currently I have 918's with titanium retainers but now going turbo so I'm worried about valve float.

whats the best spring for boost?
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Old 11-11-2008, 07:44 PM
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I had no problem with the Comp 918s at 7#
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Old 11-11-2008, 08:09 PM
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basically I'm wanting around 800hp mx, not so sure what psi that will work out to with the garrett gt45 turbo.
Last edited by lewroe; 11-11-2008 at 08:17 PM.
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Old 11-11-2008, 08:48 PM
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Well I guess that I can delete my post now that I have that info!

800 hp, Sounds like fun!
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Old 11-12-2008, 02:00 AM
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If there is a big cam in the car you may want to think about doing a set of patriot dual springs. If its a small cam the 918's will probably be fine.
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Old 11-12-2008, 02:15 AM
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Originally Posted by black98ws6ta
If there is a big cam in the car you may want to think about doing a set of patriot dual springs. If its a small cam the 918's will probably be fine.
+1.... duals
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Old 11-12-2008, 07:53 AM
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600 lift cam
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Old 11-12-2008, 09:14 AM
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PRC or Patriot golds. I prefer PRC because the retainers don't use the nasty and heavy super7 locks. The big super7 locks defeat the purpose and expense of using titanium retainers.
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Old 11-12-2008, 09:20 AM
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Isn't float more associated with RPM?
If so, what rpm are you trying to reach?
I had my heads built by a pro and he had no problem with the 918s.
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Old 11-12-2008, 10:10 AM
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Originally Posted by koolaid_kid
Isn't float more associated with RPM?
If so, what rpm are you trying to reach?
I had my heads built by a pro and he had no problem with the 918s.
When boosted, you have to consider what the boost takes away from your spring pressure. If you have a 2" intake valve, it has a surface area of ~3 square inches. With 10 pounds of boost, that equates to a reduction in effective spring pressure by ~ 30lbs. Now factor in your RPM! I ran 918's on low boost. No way I would run 918's on anything making 10psi or more.
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Old 11-12-2008, 10:19 AM
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patriot extreme duals
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Old 11-12-2008, 11:10 AM
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+1

Best bang for the buck in a stock 1.300"~ spring pocket.
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Old 11-12-2008, 01:36 PM
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Forgive my ignorance, but what does PRC stand for?
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Old 11-12-2008, 04:40 PM
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Originally Posted by Gauge
Forgive my ignorance, but what does PRC stand for?
Precision Race Components!

its ok, we were all there at one time also..
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Old 11-12-2008, 04:48 PM
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Originally Posted by black98ws6ta
If there is a big cam in the car you may want to think about doing a set of patriot dual springs. If its a small cam the 918's will probably be fine.

Bingo! Thats what I have with the EPP cam 589/ 608 lifts 7k shifts and no float. 14 psi.
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Old 11-14-2008, 09:49 PM
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went with the patriot extreme gold springs, good price. $300
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Old 11-15-2008, 04:25 AM
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I run Patriot Extreme on my 408 with 15lbs of boost with no problems yet
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Old 11-15-2008, 04:32 AM
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Originally Posted by lewroe
went with the patriot extreme gold springs, good price. $300
http://texas-speed.com/shop/item.asp...d=173&catid=48
http://texas-speed.com/shop/item.asp...d=172&catid=48

i prefer prc myself..
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Old 11-16-2008, 02:15 PM
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Originally Posted by BLOWNBLUEZ06
When boosted, you have to consider what the boost takes away from your spring pressure. If you have a 2" intake valve, it has a surface area of ~3 square inches. With 10 pounds of boost, that equates to a reduction in effective spring pressure by ~ 30lbs. Now factor in your RPM! I ran 918's on low boost. No way I would run 918's on anything making 10psi or more.
doesnt exactly work that way
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Old 11-16-2008, 04:12 PM
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I also agree. 918's would probably be good to 500 or 600 without a big cam. But shooting for 800 whp i would definatly go for doubles, patriot or prc. Both are great products.

Chris
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