hx40 stock motor what cams..?

[2GEEZEY]

I was thinking 272/264, im looking on others inputs/ possible numbers aswell..not trying to blow her up yet..still have to get a few things to finish the built 2.3.. winter is coming so I have some time to work with but she is awd....

 

[99ECLIPSEGSXDSM]

272's

 

[KazooGS-T]

I have a set of Tx280s sitting here, so I figured I'd put them to good use. We'll see how it does . I recommend Gsc S2's Or Tx272, though

 

[Armandotech]

HKS 272 as a minimum but optimal would be GSC S2's or FP4R's

 

[bastarddsm]

Fast by stock. Try it out....

 

[Brandon Mau]

Seeing that your going to be running a stroker i wouldnt run anything less than a 272 kelford or gs2 cam. What is yoir purpose withe the car. Drag,autox?

 

[2GEEZEY]

purpose of this build was at first to make a very fast street car dedicated to a woman who was a second mom to me that passed away 2 years ago from breast cancer. she loved ironman so that's what im making with my cayenne red gsx. drag car, weekend warrior, just a ultimate beast that I plan on taking only to the track and out for maybe some sunday airens reason why I asked 272/264 my buddy was selling them for cheap but the 272s sound better for that top end. just want her to spool as fast as possible

 

[RWD4G63]

What size turbine housing are you going to run? This is going to determine a lot.

If you're running one of the larger twin-scroll housings, Kelford 276HL's are my recommendation.

 

[JusMX141]

Don't go over a 272 cam with the stock valve train- and make sure it's not a high-lift cam like Kelford or you risk floating the valves at high RPM.

 

[RWD4G63]

Don't go over a 272 cam with the stock valve train- and make sure it's not a high-lift cam like Kelford or you risk floating the valves at high RPM.

This is indeed true. You're going to have to upgrade your valve springs with anything over a weak HKS 272. BUT it's totally worth it. The right camshaft application is totally underrated in my mind, when everything works together in harmony, that's when things are fun!

 

[boosting_pwr]

I'm running an HX40 in a dsm bolt on housing with HKS 272's on a 2.3 and I see 20psi by 3900 RPM's. I know you'll be running a 2.0 so I would assume the spool would be slower but not by much. I rev it out to 7500 on stock valve train and so far no issues. I do wish I would have upgraded while the head was out but I don't plan on going anymore aggressive on cams...for now anyways. That's what I said when I had my 16g and look at where I'm at now....

 

[92AWDHX40]

Still working on my setup but thinking hx35 or hx40 with some fp cams, goals mostly street car.

 

[LandSpeed-DSM]

"Larger" aftermarket cams and a lot of boost through a bolt-on housing is going to make quality valve springs a necessity. Do it right the first time and invest in a set of Kiggly or GSC Beehives.

 

[Mickey6]

GSC S2's would fit right in line with a 60mm Hx40. If your taking it to the upper limits of your power band I'd definitely recommend upgrading your valve springs so your valves don't float.

 

[LandSpeed-DSM]

I'd be hesitant to go with TX272s, 276HLs or a GSC S2 if he doesn't plan on going past 7500rpm.. in a bolt-on housing no less. In a housing that breathes better up top and intentions on 8.5k rpm or so, definitely. But S1s would better fit the bill if sticking to factory redline.

 

[Mickey6]

I'd be hesitant to go with TX272s, 276HLs or a GSC S2 if he doesn't plan on going past 7500rpm.. in a bolt-on housing no less. In a housing that breathes better up top and intentions on 8.5k rpm or so, definitely. But S1s would better fit the bill if sticking to factory redline.

Definitely agree ^^^. One would hope that if he's building a 2.3L engine that he would spend the couple hundred extra on some Kiggly valve springs.

 

[2GEEZEY]

Ill be running the dsm bolt on housing, well that's what I ordered..but I might send it back for the t3.

 

[RWD4G63]

Ew bolt on housings. Twin-scroll FTW.

 

[Mickey6]

Ill be running the dsm bolt on housing, well that's what I ordered..but I might send it back for the t3.

Can pick up a 16cm^2 divided T3 for pretty cheap on ebay. Then just need a quality manifold to go with it. Way better option than to choke out the turbo with one of the BEP ones.

 

[BogusSVO]

With the holset, a set of bronze guides, stainless valves, and good valve springs, before you even go get cams.

I am seeing a few 4g heads, that were recently rebuilt, running larger than 16g turbos, with excessive guide wear on the exhaust side.

More boost (air) + More fuel = more heat

There are 2 ways for a valve to disperse heat.

1) valve to seat contact
2) valve stem to guide

The stock cast iron guides, or cast replacement guides will not last long with with the elevated temps that high boost generates.

It is fairly common knowledge that most holset turbos are happy in the 30psi range, that is over twice the stock setting of 14psi.

Build the head first, then decide on cams.

If you have the thought you will run the bigger cams, like the Kelford272 or GS3 or something out side of the smaller 272 like HKS, BC, FP2/comp cams, get the good springs so you will not be limited by the springs.

 

[Awd-laser]

Well bogus I'm glad you said that because I'm about to bolt a holset on and I have never upgraded my valve guides. Now I know what to look for and to build a spare head. I have never heard that about Holset turbos.

 

[BogusSVO]

It is not "Just holset" turbos this applies too, but any turbo that will be in the mid 20's psi range, and flowing a good lb/min.

 

[92AWDHX40]

That's good to know dale.

 

[Diamond Star Werks]

Ew bolt on housings. Twin-scroll FTW.

Love the twin scroll setup I have.

 

[Archer Fabrications]

With the holset, a set of bronze guides, stainless valves, and good valve springs, before you even go get cams.

I am seeing a few 4g heads, that were recently rebuilt, running larger than 16g turbos, with excessive guide wear on the exhaust side.

More boost (air) + More fuel = more heat

There are 2 ways for a valve to disperse heat.

1) valve to seat contact
2) valve stem to guide

The stock cast iron guides, or cast replacement guides will not last long with with the elevated temps that high boost generates.

It is fairly common knowledge that most holset turbos are happy in the 30psi range, that is over twice the stock setting of 14psi.

Build the head first, then decide on cams.

If you have the thought you will run the bigger cams, like the Kelford272 or GS3 or something out side of the smaller 272 like HKS, BC, FP2/comp cams, get the good springs so you will not be limited by the springs.

Foooorrrr what it's worth. I run a stock head with bc272 cams (it was all stock rebult/machined, 3 angle valve job machining etc.) and i run 37psi at the track and 8000 rpm no issues. Granted race gas... And i ran the 11.1@132 stock intake manifold and 1g throttle body too. A built head always helps, and is on my list. But the latter can be done.

So long as your sayin, have a good condition head, i agree for the most partI dont think the ss valves or bronze guides are necessarily a must. But it's probably a good idea if your rebuilding anyway i also agree springs are a good idea woth larger cams