Crower valve train

[zack11122]

I've been trying to find reviews and builds on non vtec stage 2 turbo cams. I cannot find any however. I plan on using this list of parts. All of this is done using a b20 block and p75 head. The p8r heads are very hard to find and pretty pricey. So ill stick with this:

Top:
Port and polish head.
Crower stage 2 turbo cams.
Crower dual spring titanium retainer.
Crower stock size intake and exhaust valves.
Crower bronze valve guides.
Crower cam gears
Supertech valve seals
Golden eagle hg

I have not yet decided on a turbo yet.

Bottom:
Shot peened ls rods with arp rod bolts
Arp main and rod studs

Fuel:
255 walbro fuel pump
Rc 550cc injectors
Aem regulator

That's all just the gist of what I want. I just want to know any changes you guys would make or suggest. Anything I don't need. If the cams are any good. So any turbo suggestion and im and tb would be appreciated.

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[Muckman]

I strongly disagree with using stock rods when you can get a set of Eagles for $300. How much does the shot peening and ARP rod bolts cost? Im guessing at least $200 combined right?

I'm assuming stock pistons too?

I would also skip the main studs. You dont need it and it requires line honing of the mains which is more than you want to deal with.

550cc injectors are going to limit you to 350whp. That may be fine now but plan for future growth. Especially when larger injectors only cost a little more.

Now regarding your main question about the cams, I cannot speak to that specifically. However I would say most "turbo" cams are a mixed bag because of their intended design. The main difference between NA and Turbo cams is back pressure from a log manifold and/or smaller turbine wheel (small turbo). We learned 15+ years ago that NA cams worked great on turbo setups that didnt have lots of back pressure - ie decent sized turbo and equal length, well designed manifold.

Cam choice is as important as turbo choice. But the two go hand in hand. Your exhaust manifold also plays a big role in cam choice so you need to decide on those parts first. More times than not turbo cams will probably make less power than a mild NA cam. Dont look specifically for B20 users with the Crower stage 2 turbo cam but look at what cams the B20 turbo guys are running and note what turbo and manifold.

 

[zack11122]

Thank you for all that muck. Now I know what to look for when researching. I didn't mean to say arp mains.i meant to say acl Main and rod bearings. I will look into bigger injectors. Time to look into some good floating pistons. What are some turbos you'd recommend?

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[Muckman]

Whats your turbo budget and power goal?

 

[zack11122]

Max 350 as I want to daily it in the summer. Other that that I don't have a budget.

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[Muckman]

The best choice in the 350-400hp category is the Garrett GT28R (GT2860 and 2871). Garrett now makes a GTX billet wheel in the same 28R family but they are rated for 425-475hp (GTX2863 and 2867). The 28R family is ball bearing and will offer the fastest spool in its category. The GTX line is baller on top of that.

Now for cheaper options Garrett does offer a journal bearing version of the GT28 family.

Precision pretty much dropped all of their small frame turbos from their catalog because they only care about big numbers but you can still find them in the market place if you know what they are. The Precision 48 family is in 300-400 HP category (4828, 4831, 4854). The Precision 54 family is going to be int he 500+ HP category and thus bigger than you need however you need to consider future growth.

I dont like anything from Turbonetics. Maybe the T3 Super 60 if you want 20 year old technology that is very cheap.

And from the OEM world a Mitsubishi TD05 16G from the Evolution is a high quality turbo that is in your HP category.

 

[zack11122]

Thank you muck. I will look deeper into this.

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[Muckman]

You are welcome.

 

[zack11122]

Most everyone I'm looking at running ls turbos are on stock everything running 10lbs making about 250.... If they have cams it's crower 404 with the rest of their valve train. I suppose I found my answer on cams.

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[Muckman]

Yes the 404s def make power. Thats literally the only non vtec cam I know of that I would recommend lol.
What turbos are they running though? The turbos I recommended before are fairly small and will produce a good amount of back pressure.

 

[zack11122]

t3/t4 57 trim .63 exhaust is mostly what I'm seeing. Exhaust manis vary. A lot of neukin. And 38 mm bov.

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[Muckman]

Stay away from the log manifolds and you should be fine. Find any nonvtec GT28 owners out there?

 

[zack11122]

What's a good manifold to use? I haven't yet. But there's 100+ pages to go through. Haha

Edit. One of the main turbos is the garrett t3/t04e


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[Muckman]

Any equal length tubular manifold like a ram horn (kooks) is good. The brand determines the quality but the design is the same.