Best turbo choice for Gen 4? I have ct20, ct15 and.. - MR2 Owners Club Message Board
 
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post #1 of 13 (permalink) Old January 8th, 2017, 22:32 Thread Starter
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Best turbo choice for Gen 4? I have ct20, ct15 and..

Ok I've got a Gen 4 going into my MR2 and I wan't no less than 300whp on 91 octane (best octane we have here, we also have e85) but with super responsive spool. Due to the gen 4 map sensor I'm limited to 17 psi or so. But, I do have an AEM FIC6 so I *may* be able to set up a map clamp and run more.

I have a ct20b, and the ct15 that comes with the gen 4 motor. Either can be upgraded by various shops for around $800. The ct15 has a reputation for being a spool monster so that's tempting me in that direction. ATS has shown 300hp on 93 octane but most people produce a bit less I believe.

Also, I'm really drooling over the newer EFR turbos and all their bells and whistles. I like the idea of trying the latest advancements. Plus it's a bit more "fun" ,to me, to run a different turbo than everyone else. And I have what it takes to build manifolds, down pipes and the rest so fabrication is no problem. Any EFR is going to run me around roughly $1800, no small sum to me, but maybe worth it.

So I guess I'm looking for direction, guidance, a smack in the head

What direction would YOU go?
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post #2 of 13 (permalink) Old January 8th, 2017, 22:37
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Here is what I would do, throw all bolt ons you can and see how CT15 performs? Dyno it. You can always send CT20B or stock turbo for the upgrade, but try stock first. You might enjoy it and upgrade down the line.
That 300whp talk - trust me I know what you mean. But I went through hell to get there and looking back it ain't worth it (at least for me).
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post #3 of 13 (permalink) Old January 9th, 2017, 12:19
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Only turbo upgrade I'd do on a Gen4 is an upgraded CT15. Either Prime or ATS.
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post #4 of 13 (permalink) Old January 9th, 2017, 12:35 Thread Starter
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Originally Posted by 2ZZXRS View Post
Here is what I would do, throw all bolt ons you can and see how CT15 performs? Dyno it. You can always send CT20B or stock turbo for the upgrade, but try stock first. You might enjoy it and upgrade down the line.
That 300whp talk - trust me I know what you mean. But I went through hell to get there and looking back it ain't worth it (at least for me).
Thanks, good advice although I'd really like to get the turbo choice made while the engine is still out and on the stand, I really hate working on this motor inside the engine bay lol.

300whp should be pretty much cake on a gen 4 from what I've seen, looks like all you need is a big enough turbo that can do it at less than 18psi (fuel cut) if you're stuck with pump gas and limited by the stock fuel cut. I think 350whp is even possible, and that would be killer on pump as long as the spool is still great.
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post #5 of 13 (permalink) Old January 9th, 2017, 12:36 Thread Starter
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Only turbo upgrade I'd do on a Gen4 is an upgraded CT15. Either Prime or ATS.
Why is that?

Given my goals?
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post #6 of 13 (permalink) Old January 9th, 2017, 14:34
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Originally Posted by fredallenburge View Post
Why is that?

Given my goals?
Probably because its an easy option for all the connections (intake, oil, water, exhaust). Installing a different turbo is only part of the cost. Makes sense to take a stock configuration like Ct20 or 15b and re-machine for a new billet wheel and high flow turbine. This is what Prime, ATS and CRW does.

Jim
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post #7 of 13 (permalink) Old January 9th, 2017, 14:59
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I'd go with an upgraded billet ct20b and gen3 ex.manifold
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post #8 of 13 (permalink) Old January 9th, 2017, 14:59 Thread Starter
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Originally Posted by benckj View Post
Probably because its an easy option for all the connections (intake, oil, water, exhaust). Installing a different turbo is only part of the cost. Makes sense to take a stock configuration like Ct20 or 15b and re-machine for a new billet wheel and high flow turbine. This is what Prime, ATS and CRW does.

Jim
Do they actually do anything to the hot side? I got the vibe they left that stock but I may be wrong.
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post #9 of 13 (permalink) Old January 9th, 2017, 15:45
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I believe they replace turbine with a steel wheel as the ceramic wheels tend to fracture when being removed. I imagine its a better design but same size & trim although I cannot confirm this.

jim
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post #10 of 13 (permalink) Old January 9th, 2017, 18:05
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Prime states on their website that they replace the compressor with a billet wheel, and a new turbine shaft and wheel, I know ATS replaces the compressor side with a billet wheel but idk if they replace the shaft or turbine with a steel wheel, you'd have to ask.

The reason I recommend them is because they should be able to reach your goals while still maintaining a factory fit and finish, and spool. You won't have to go searching for a gen3 exhaust manifold and then have to buy a turbo kit on top of that. Since it's all one piece on the Gen4.

According to the Dyno sheet on their site, Prime made 327whp at 17psi on their Stage 2 CT15, which at 15psi should leave you around 300whp.

ATS made 281whp on their CT16 at 16psi. So either turbo will get you near your goal.
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post #11 of 13 (permalink) Old January 9th, 2017, 20:14 Thread Starter
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Prime made 327 wheel horsepower and 267 lb ft of torque at 17psi on an unopened Prime GEN4 swap with Prime 3" intake, Prime 3" downpipe, Berk 3" exhaust, and Prime 2.5" intercooler kit. This was on 93 octane pump gas and stock ECU. No piggybacks or funny business on the Dynojet.
(from Prime's website)


327whp on stock ecu with no piggyback, that's just too easy!

That Prime billet ct15 looks killer, in fact it's getting hard to make a solid case for any other turbo for my particular situation and goals. I suppose an even larger turbo would make more at the same 17psi they ran but for what the turbo would cost plus the time and effort to fit it in there.....hard to make a case for it.

And with my AEM6 if I can sort out the maf clamp and run a 91/e85 mix I'm sure 20psi wouldn't be a problem, maybe more even, I might hit 350+ wheel
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post #12 of 13 (permalink) Old January 9th, 2017, 22:06
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Then gen 4 ECU's are superior to the gen 3's IMO which allow more power with limited mods. I'd avoid any additional piggy backs like mentioned if you want to push power a tad more.

jim
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post #13 of 13 (permalink) Old January 10th, 2017, 12:20 Thread Starter
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Then gen 4 ECU's are superior to the gen 3's IMO which allow more power with limited mods. I'd avoid any additional piggy backs like mentioned if you want to push power a tad more.

jim
They do seem to be quite a lot improved over the ancient gen2 that's for sure.

Since I've already got the FIC6 I think I'll try it out on the gen4 as long as I can get a jumper harness for the gen4 ecu (That way I can take out the FIC6 easily and cleanly at any time). Even if I don't actually use most of it's features it's quite handy for monitoring and logging various sensor voltages, AFR if you have a wideband, injector duty cycle, etc. It's a cool little box.
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