CA18DET 200SX S13 Build - Technical Issues

[blanc0]

Hello everybody.

Please excuse me if there is a similar thread, I don't want to cause any issues whatsoever.

Anyways..

I am currently building my 200SX RS13 CA18DET to handle somewhere around 400 WHP; now I know what needs to be done, but I want to ask you guys some specific questions about some specific parts..

For example, assuming internals are all in place (Forged pistons, rods, balanced assembly, bearings, etc.etc.), what cam lift should I run ? Can I stick with the 8.8 mm and use the Tomei Procam Lash type ? Can I fit dual valve springs with the hyd lifters ? Also, can I port the intakes of the head (+ intake mani) AND the exhaust ports, along with a custom exhaust manifold (thinking of going with a twin-scroll setup)?

Also, would a Garrett GTX3076R with an .86 A/R be able to produce the power I have in mind ? Can it be "twin-scrolled" ?

Thank you in advance and sorry for the long essay )

[themadscientist]

For example, assuming internals are all in place (Forged pistons, rods, balanced assembly, bearings, etc.etc.), what cam lift should I run ? Can I stick with the 8.8 mm and use the Tomei Procam Lash type ?

Contrary to what some would suggest, getting power by increasing revs in a CA is the wrong direction IMO. The rod length and angles hate that. The block is extremely strong, though, and if you have a good head gasket will take whatever boost you throw it at. Make power on boost not revs. That being said you can use those cams.

Can I fit dual valve springs with the hyd lifters ?

If you are taking my advice this is not even necessary. You will not be turning the kind of RPMs that would cause valves to bounce or to make a long duration cam or solid lifters necessary. I don't think the CA 8 port head would breath very well at screaming RPMs either.

Also, can I port the intakes of the head (+ intake mani) AND the exhaust ports, along with a custom exhaust manifold (thinking of going with a twin-scroll setup)?

Yes and you will reap a lot of rewards for that.

Also, would a Garrett GTX3076R with an .86 A/R be able to produce the power I have in mind ? Can it be "twin-scrolled" ?

Thank you in advance and sorry for the long essay )

All day long. Heck, you could get that from a 3071R without much trouble and it might be a hair more responsive. For a drift or track car I would go 71, drag or highway 76.

[blanc0]

Contrary to what some would suggest, getting power by increasing revs in a CA is the wrong direction IMO. The rod length and angles hate that. The block is extremely strong, though, and if you have a good head gasket will take whatever boost you throw it at. Make power on boost not revs. That being said you can use those cams.

So basically you are saying stick with the stock lift ? But more aggressive cams mean only higher duration ? Sorry if I sound stupid.

I don't think the CA 8 port head would breath very well at screaming RPMs either.

I have the 4-port head, but same thing applies, I guess..

So, turbo-wise, for 400 Wheel HP, GT3071R would do the trick ? Does it come with a twin-scroll option ? How's the spool compared to the GTX30 series ? Or should I look at other turbos, like Precision, Borg Warner..Holset ?

[silvios]

Contrary to what some would suggest, getting power by increasing revs in a CA is the wrong direction IMO. The rod length and angles hate that. The block is extremely strong, though, and if you have a good head gasket will take whatever boost you throw it at. Make power on boost not revs. That being said you can use those cams.

So basically you are saying stick with the stock lift ? But more aggressive cams mean only higher duration ? Sorry if I sound stupid.

I don't think the CA 8 port head would breath very well at screaming RPMs either.

I have the 4-port head, but same thing applies, I guess..

So, turbo-wise, for 400 Wheel HP, GT3071R would do the trick ? Does it come with a twin-scroll option ? How's the spool compared to the GTX30 series ? Or should I look at other turbos, like Precision, Borg Warner..Holset ?

It also may be worth noting opting for a .63 exhaust housing for extra response as well.

[float_6969]

I'll be in the same neighborhood as you and will be running HKS 264's @ 8.8 lift, stock lifters and springs. I have no fears about the top end , or the bottom for that matter, holding together, and should easily reach that goal.

[blanc0]

I'll be in the same neighborhood as you and will be running HKS 264's @ 8.8 lift, stock lifters and springs. I have no fears about the top end , or the bottom for that matter, holding together, and should easily reach that goal.

How about Tomei's 260 Cams, will they be ok for that kind of power ?

[dash]

street 4 port gone well past 500 whp with Tomei 260s.
Old nico posts of how well plain old classic t3/t4 50 trim perform and respond on ca18s
I posted a link way back of a BP (1.8L) powered monster street miata that made over 500 ft-lbs tq on a 50 trim!
....would break traction over 100mph. Aiming for a ca18 version/copy.... or die trying

[float_6969]

I'll be in the same neighborhood as you and will be running HKS 264's @ 8.8 lift, stock lifters and springs. I have no fears about the top end , or the bottom for that matter, holding together, and should easily reach that goal.

How about Tomei's 260 Cams, will they be ok for that kind of power ?

My expectation (I don't have proof yet, but the UK guys have done this a bunch of times) is a small loss in bottom end, and a definite gain in top end. The HKS's are supposed to move peak HP to around 7500 rpm, which isn't an insanely high RPM, at least for this motor. The Tomei's should be in the same neighborhood.
With REALLY good tuning (I spent months perfecting my tune), I was running the stock cams and stock turbo @ 15psi, with supporting mods, to 8K regularly, and power wasn't falling off much between peak HP (around 7K) and redline. But there was some definite ignition timing trickery going on there, and I had A LOT of supporting mods.

Anyway, my point is, cams are necessary, but will make reaching those power levels easier.

[blanc0]

Right, well thank you very much for the info, I reckon I'll be singning in here many times prom now on