Favorite Big Turbo?
Evolving Member
Joined: Sep 2017
Posts: 135
Likes: 5
From: EvoNation
Is it worth just switching out the springs/retainers and cams while the head is still on vs taking it off and getting it worked? The price tag starts to dramatically increase at that point. Also, this is definitely not a daily. This is my weekend/toy car so not as worried about drivability issues.
Originally Posted by ForceFed4g63
I currently have a Full Race Twin Scroll T4 setup with a S366. Built bottom end but stock head with HKS 272 cams. The lag is such that I don't have a huge powerband since I'm not revving super high. Anybody have some suggestions for a reasonably priced alternative that will spool sooner but still make upwards of 700+ whp? Or am I better off saving up and getting a built head?
Newbie
Joined: Mar 2014
Posts: 34
Likes: 10
From: SC
Yes, I'll take a look as soon as I can, been raining here nonstop.
Yea I know the HKS cams aren't the best for this setup, I figure either GSC S2 or S3 would be much better, along with springs and retainers. I would love to have a BB turbo but the dramatic increase in price doesn't justify the gains IMO.
It is a 2.0 built bottom end. The rev limiter is set at a conservative 7200.
You can install springs and retainers including the cams, while the head is on, without the need to remove it. At this power level, porting the head is not a must. You can try switching cams and springs in order to be able to rev higher and see if you are happy with the results. Eventually, even if you are not happy, you will have a built head and be ready to switch to a smaller turbo if you decide. From what i see, your turbo is a thrust bearing turbo. Also, taking into account your cams, it is a mismatch, as the boost does not come as soon as you like and the cams choke your flow at higher rpms. Switching to better cams, and buying a ball bearing turbo with a divided a/r will help you a ton
It is a 2.0 built bottom end. The rev limiter is set at a conservative 7200.
Originally Posted by ForceFed4g63
Yes, I'll take a look as soon as I can, been raining here nonstop.Yea I know the HKS cams aren't the best for this setup, I figure either GSC S2 or S3 would be much better, along with springs and retainers. I would love to have a BB turbo but the dramatic increase in price doesn't justify the gains IMO.It is a 2.0 built bottom end. The rev limiter is set at a conservative 7200.
That thing needs S3's and a magnus V5 intake manifold to take advantage of that 66mm compressor.
Newbie
Joined: Mar 2014
Posts: 34
Likes: 10
From: SC
Originally Posted by ForceFed4g63
8,500 on factory valvetrain??? My understanding is that's way too high.
You need to put cams and springs in it though, you're choking that turbo.
Newbie
Joined: Mar 2014
Posts: 34
Likes: 10
From: SC
Originally Posted by ForceFed4g63
I agree 100%. It's first on the list. I'm also on the stock 6 speed though so I'm living on borrowed time there too.
Newbie
Joined: Mar 2014
Posts: 34
Likes: 10
From: SC
Yes definitely not launching it. It's right around 400ft lbs as it sits. I have a spare Shep stage 1 5 speed as well, but having trouble finding anyone who still provides a 5 speed swap kit.
Newbie
Joined: Mar 2014
Posts: 34
Likes: 10
From: SC
I've done hours of searching. Jack's and Shep sell a kit but they're rarely in stock. Also Whalen sells their own proprietary harness which looks like it makes the install process much easier.
Evolving Member
Joined: Sep 2011
Posts: 126
Likes: 6
From: Finland
Newbie
Joined: Mar 2014
Posts: 34
Likes: 10
From: SC