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Hello there. I am from Greece and i got Lancer Evo IX. My car has hks air intake, ets intercooler with stm intercooler pipe kit, aeromotive fuel pump, tomei exhaust, ecutek ecu flash. I am searching for a camshaft upgrade. My engine and turbo are stock. After a lot of reading i finally get a conclusion in those camshafts. And i need your opinions and advices. I am between those tomei poncam type R 270 in/ex, GSC s1 or s2 and JUN 272. I will replace valvesprings too. Also i want to know if i have to change injectors too and conrod bolts. My tuning purpose is daily driven and i am time attack person. All advices are welcome
IMO, if you're going to do springs/retainers go with the GSC S2's which also has room for your build to grow. Throw some 1000cc injectors and a wally 255 then retune.
GSC S2, but not GSC springs (see pic below). Purchase Kiggly springs and retainers. I was fortunate to have only lost the spring, but other members had their engines destroyed because of GSC springs just snapping and dropping the valve into the piston.
That issue with the GSC springs was remedied a VERY long time ago. I have not had an issue with a single one of the several GSC spring kits I've installed over the last couple of years. The Kiggly springs are another great option, but the issues with the GSC springs are very much a thing of the past.
You have a IX, so get the billet GSC S2's and go with their GSC5041 valve spring and retainer kit to future proof your build. While your in there, you might want to consider changing your valve stem seals. You don't have to upgrade your rod bolts yet, but it could help with the high revs from time attack. Instead I would go for 1100cc or higher injectors, you can easily break 400whp on E85 if that aeromotive pump is compatible.
Have you considered going to a different turbocharger? Bang for you buck the HTA 71 would make more then the cams at this point. If you ever decided to run race gas you would see even more of an improvement over the cams/stock turbo combo.
I was able to make over 600whp on stock mivec cams with some boost on a red/ ethanol. The S2's are a nice improvement but the stock turbo is a bottleneck.
This is what I got with HTA71 and stock cams:
Here is power with S2 cams and 5041 (I ran out of fuel 6000rpm, otherwise, maybe there could have been 10hp more):
That issue with the GSC springs was remedied a VERY long time ago. I have not had an issue with a single one of the several GSC spring kits I've installed over the last couple of years. The Kiggly springs are another great option, but the issues with the GSC springs are very much a thing of the past.
GSC S2 cams also get my vote.
That is an interesting position considering GSC in all cases that I am aware, except mine, blamed it on "install error." Please refer to the post where GSC acknowledged they had an issue and corrected it. I am not aware it exists because that would impose liability on GSC. Don't protect vendors who stuck it to forum members when they had to replace their engines due to spring failure.
That is an interesting position considering GSC in all cases that I am aware, except mine, blamed it on "install error." Please refer to the post where GSC acknowledged they had an issue and corrected it. I am not aware it exists because that would impose liability on GSC. Don't protect vendors who stuck it to forum members when they had to replace their engines due to spring failure.
Well, the springs stopped breaking, didn't they? Obviously something changed.
Additionally, that is the nature of aftermarket parts. Especially racing ones. If a part has a failure, the only thing the warranty covers is the part itself, none of the collateral damage it may cause is covered. Some goes for the parts you get at autozone, or even OEM parts from the dealer.
Well, the springs stopped breaking, didn't they? Obviously something changed.
Additionally, that is the nature of aftermarket parts. Especially racing ones. If a part has a failure, the only thing the warranty covers is the part itself, none of the collateral damage it may cause is covered. Some goes for the parts you get at autozone, or even OEM parts from the dealer.
I recall there were casting marks along the metal on those that failed. New ones are smooth and don't have those casting leftovers. And I think the ones that failed were 5039 spring sets.
Last edited by 2006EvoIXer; Jun 30, 2018 at 02:25 PM.
Well, the springs stopped breaking, didn't they? Obviously something changed.
Additionally, that is the nature of aftermarket parts. Especially racing ones. If a part has a failure, the only thing the warranty covers is the part itself, none of the collateral damage it may cause is covered. Some goes for the parts you get at autozone, or even OEM parts from the dealer.
Aftermarket or not, people do not purchase valve springs with an expectation of potential failure. Just because it's aftermarket doesn't relieve GSC of liability when the expectation of failure doesn't exist. Can you image how many springs a company would sell if it stated, "Our valve spring might break under normal use causing catastrophic engine failure."
It's disappointing to see your position so aligned with GSC when forum members were stuck with substantial expenses due to broken valve springs. If broken valve springs are just a part of buying aftermarket parts then why would GSC correct the issue as you have suggested. I think members will make up their own minds about you and GSC based on this thread.
Aftermarket or not, people do not purchase valve springs with an expectation of potential failure. Just because it's aftermarket doesn't relieve GSC of liability when the expectation of failure doesn't exist. Can you image how many springs a company would sell if it stated, "Our valve spring might break under normal use causing catastrophic engine failure."
It's disappointing to see your position so aligned with GSC when forum members were stuck with substantial expenses due to broken valve springs. If broken valve springs are just a part of buying aftermarket parts then why would GSC correct the issue as you have suggested. I think members will make up their own minds about you and GSC based on this thread.
You don't purchase anything with the expectation of failure.
When you buy any racing parts, they come with not warranty, and they also typically explain the mfg is not responsible for the failure of the parts causing damage to other components. I'm not saying they didn't have some bad springs go out. I'm saying **** happens, and that is why products come with legal disclaimers.
