My friends are trying to help me get started on a turbo build for my car. I printed off the parrts list from this forum and now I'm just figuring out a game plan. One of my friends thinks a 14B?? from a 4G63 would work pretty well since it'll easily make about 15psi of boost at around 3K RPM, and will support over 18psi if I really want to boost that high. He has a couple laying around that I can use. Any thoughts on this?
so i'm guessing that you've never read any of the posts on this forum before? because anyone with a hahn kit, or even the saab turbo system conversion, is running a mitsu turbo. Not a 14B, but 16G's mostly, and some 20G's. Hahn uses a 15G on their LN2 kits, and at 8 psi it nets 171 whp...... From what I've read, the 14B is basically similar to a T25 but with a larger exhaust wheel.... i'd say its probably a bit on the smallish side if thats the case. From the compressor maps that PJ (DaFlyinSkwirl) made in his OHV days, the T3S60 and the GT28RS are the most ideal choices for the OHV at most psi levels (i think he did his maps assuming 5, 10, and 15 psi. The 14B will work but believe me, and this is coming from someone who's turbo can seriously reach 24 psi before 3000 rpm, fast spool is entirely overrated... you have a lot of displacement compared to most 4 cylinders, put it to proper use by using a larger and better matched turbo.
In the end, the 14b will work for now, and i guess it pulls some weight if you can get it for practically free, but if your entire piping scheme is going to be designed around a turbo, than it should be a turbo that is the best possible match for your engine... Its up to you, but its something to think about.
Arrival Blue 04 LS Sport
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Turbo
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'Nuff said
Interesting. Admittedly, no, I don't read the posts in this forum much. I hadn't seriously thought on boosting t his car, but my friends are talking me into it as they've taken more of an interst in the idea of a turbo'd J. As far as boosting a J goes, I'm no stranger; I did a turbo on my first Cavalier but that was nearly 8 years ago and things have changed quite a bit since then.
Now, he does have a 16G I believe too, but I'm not entirely sure. We were sitting around debating on whether it would be too big or not. I've not done a ton of research as far as what the currently available kits come with since I tend to put my own parts list together and build from that. I figured if anything else, I could use the 14B as a basis to fab the manifold, exhaust, intake, etc, as the 16G should, in theory, fit with little or no extra problems.
I appreciate the insight. Feel free to keep it coming.
if the 14b is anything like a t25, you do not want to use it. The t25s are too small and I have seen several cars running it past around 16psi and killing it. That turbo = poo. The 16g is being used by hahn, as said above, and they seem to be a very reputable and knowledgable company. I would go with at least that. It wouldn't be a bad idea to get the compressor maps for the different turbos you are looking at and see how they are going to work with your motor.
the lemur wrote:It wouldn't be a bad idea to get the compressor maps for the different turbos you are looking at and see how they are going to work with your motor.
That'd be nice, but that kind of information might be hard to come by unless someone has actually tested it.
A 16G would be ideal in my opinion. I talked to my buddy last night and he doesn't have the 16G anymore, just the 14B and some other turbo from a 4G but I don't remember which one it was. But again, aren't they externally the same? Obviously the internals are different but I thought the 16G would be a direct replacement if I used the other as a mock-up, since they're both made for the 4G63.
I suppose I could buy a pre-made kit from Hahn but I have the pre-98 LN2 and their kit, last I knew, was for the 2200. I understand the heads are a bit different so switching the manifolds to make it all work is not an option.
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It wouldn't be a bad idea to get the compressor maps for the different turbos you are looking at and see how they are going to work with your motor.
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That'd be nice, but that kind of information might be hard to come by unless someone has actually tested it.
Not really no, thats the point of compressor maps, to see what would best fit your engine before you buy it. Its just some pretty simple calculations involving your altitude and engine flow dynamics. You place these over the pre-made compressor map to see how effective that turbo will be a certain psi levels.
I've always done everything by trial and error, so you're going to have to educate me on this a bit. Let me get this straight. You take a given turbo, and you have the compressor map, assuming from the manufacturer, correct? And you calculate the compressor map for a specific engone with engine flow dynamics and altitude. Right. I know exactly how to do that. It's right up there with my other tricks like turning water into wine and pulling rabbits out my belly button.
Seriously, I have no idea how to figure all that sh*t out. I'm not an engineer.
