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Old 04-08-2012, 12:20 AM   #1
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Default Upgrading to turbo...soonish

Currently running a m45. Planning on going turbo once I have everything running right with diypnp.

I don't know too much about ar and all that stuff on turbos so hopefully you guys can help me out. My friend's MR2 is putting out 370hp, so something about there or more would be great. I was planning on getting the FM manifold so I don't have to worry too much reliability. Then going with a godspeed chinacharger. What size turbo would you recommend for best balance of power with least amount of lag?

My m45 is connected to an intercooler similar to the trackdog intercooler where the pipes goes over the radiator. Would it be extremely difficult to get this to work with a turbo? I'm hoping to reuse everything and just get a turbo, manifold, downpipe, piping to connect turbo to intercooler, and maybe bigger injectors.
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Old 04-08-2012, 12:27 AM   #2
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I see absolutely no reason why that IC setup won't work with a turbo. 370whp? Seriously? 370whp is a turbo Miata is serious...
Did you ever dyno with the M45?
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Old 04-08-2012, 12:40 AM   #3
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I'm thinking if are trying to hit 370whp, that the whole "maybe bigger injectors" needs to become "getting massive injectors." You'll also need to build that motor of yours, 3" exhaust, and lots of other supporting stuff. You are probably going to need a larger intercooler and intercooler piping to support that kind of goal.
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Old 04-08-2012, 12:53 AM   #4
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Maybe I should set my goals a little lower. Would like to beat my friend's MR2 though.
If I can beat him I think he will go into depression.
A the same time, I was hoping to make this car reliable enough to be my daily driver so I can have fun driving to work. SUV's not very fun.

The M45 only tweaked out 140hp. That's with a misfire and I think the guy didn't know how to tune. Maybe the M45 needs a rebuild, I dunno. Car doesn't idle right when cold and he can't figure it out. The misfire I'm hoping to get rid of with ls2 truck coils.

Currently have 8.6:1 84mm supertech pistons and m-tech rods.
99 head that's been ported. Stock crank I think would be the weak point.
Anything else I need to build up on the motor?
Friend has a magnaflow turbo exhaust sitting around for years. Might have to confiscate that from him.

What other supporting stuff will I need? I know I might need to get a wastegate but I have a blowoff valve already (not installed, just have one laying around).
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Old 04-08-2012, 01:04 AM   #5
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Quote:
Originally Posted by Halcyon View Post
Currently running a m45. Planning on going turbo once I have everything running right with diypnp.
Smart. Get used to MegaSquirt first before trying to make huge power.

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Originally Posted by Halcyon View Post
370hp...so something about there or more would be great.
That is a lot of power. Are you willing and ready to address the issues and parts needed to safely and reliably make that power?

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Originally Posted by Halcyon View Post
I was planning on getting the FM manifold so I don't have to worry too much reliability.
Good manifold.

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Originally Posted by Halcyon View Post
Then going with a godspeed chinacharger
You'll need to get something gigantic like 18psi's old 3076 and run it at insane boost levels to make 370whp. There are not a lot of great china turbos that come in T2 footprints.

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What size turbo would you recommend for best balance of power with least amount of lag?
That is preference.

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Originally Posted by Halcyon View Post
My m45 is connected to an intercooler similar to the trackdog intercooler where the pipes goes over the radiator. Would it be extremely difficult to get this to work with a turbo?
How in the world can we help you with that if we have no idea what it looks like or how you're running it.

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I'm hoping to reuse everything and just get a turbo, manifold, downpipe, piping to connect turbo to intercooler, and maybe bigger injectors.
You won't be able to reuse anything except for the MS and possibly your intercooler.

Trust me. I went from a M45 to a turbo setup. I pretty much threw everything away and wasted a few days trying to "undo" the supercharger setup.

Injectors are a must. 1000's would be good.

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Currently have 8.6:1 84mm supertech pistons and m-tech rods. 99 head that's been ported.
Perfect. Now lets hope everything is still fine from that super crappy tune you've been running with the stupidcharger.

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Stock crank I think would be the weak point
You think wrong. The stock B6/BP crank is forged. It won't break.

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Anything else I need to build up on the motor?
Bottom end is all you need for those HP goals.

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Originally Posted by Halcyon View Post
Friend has a magnaflow turbo exhaust sitting around for years. Might have to confiscate that from him.
"Turbo exhaust" makes me laugh. If it's not for a miata and at least 3", then I'd pass.

Last edited by viperormiata; 04-08-2012 at 01:19 AM.
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Old 04-08-2012, 02:11 AM   #6
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Starting to sound like 370hp is not easy for a lil miata.
How about 250hp? I'm reading a lot of people getting around there.

Any info on what ar I should look for or avoid?
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Old 04-08-2012, 02:20 AM   #7
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250rwhp should be no sweat if your engine has rods and pistons like you mentioned in the first post.

You may be able to push it to 300rwhp even with what you have.
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Old 04-08-2012, 08:27 PM   #8
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I can get an upgraded ct26 for free. It's been bored out by Garrett and the internals been upgraged as well. It was making 300hp on a MR2 at 14psi.

Would this be a good turbo to start off with? Can anyone confirm it's got a t2 flange and the flange to the downpipe is the common one used on most turbo? Planning on starting off with this one but would like to be able to easily upgrade turbo in the future.
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Old 04-08-2012, 08:42 PM   #9
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250rwhp is a good number, any more and you'd need to upgrade to a 6 speed since 5 speeds seem to be good up until 250rwhp depending you how aggressively you drive it.
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Old 04-08-2012, 10:12 PM   #10
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If I upgrade to a 6 speed will my speedometer/tach reading still be accurate?
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Old 04-08-2012, 11:29 PM   #11
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I don't know for sure if it'll be 100% accurate from the start, but I imagine you can fix it to work right.
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Old 04-11-2012, 12:48 PM   #12
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Quote:
Originally Posted by Halcyon View Post
I can get an upgraded ct26 for free. It's been bored out by Garrett and the internals been upgraged as well. It was making 300hp on a MR2 at 14psi.

Would this be a good turbo to start off with? Can anyone confirm it's got a t2 flange and the flange to the downpipe is the common one used on most turbo? Planning on starting off with this one but would like to be able to easily upgrade turbo in the future.
It's not a T2/3/4/6 flange. It's a proprietary Toyota flange.

If it's a single entry CT26, give it to me, i could use it. If it's a twin entry, DO NOT WANT.
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Old 04-11-2012, 01:42 PM   #13
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You would need to get a speedo sensor or entire gauge cluster from a miata with the correct 6speed ratios i.e. 4.30; 3.9; 3.636

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Old 04-11-2012, 02:14 PM   #14
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260whp on a dynojet in my car is just as fast as a base C6 from a roll... Then we have braking and corners. These numbers don't make sense to Miata newbs.
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Old 04-11-2012, 02:37 PM   #15
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You would need to get a speedo sensor or entire gauge cluster from a miata with the correct 6speed ratios i.e. 4.30; 3.9; 3.636
I was just told this: The speedo readout is a function of the differential, not the tranny. Tach has nothing to do with either.

Who's right?
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Old 04-11-2012, 02:41 PM   #16
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not the person you just talked to...
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Old 04-11-2012, 02:53 PM   #17
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I was just told this: The speedo readout is a function of the differential, not the tranny. Tach has nothing to do with either.

Who's right?
You are so confused. Your transmission gear ratio and rear differential are going to affect the speed reading of your car (Note: your speedometer sensor plugs into the transmission). Even tire size is going to affect your speedometer rating. Now you mentioned tach here, which I hope you understand means tachometer. This shows RPM (Revolutions per minute), and this has more to do with your motor, but since your crank is hooked up to the transmission which is hooked up to the differential, they all sort of work together.

I hear mustangs are nice.
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Old 04-11-2012, 03:42 PM   #18
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I hear mustangs are nice.
Don't like mustangs.
I have 2 Camaros though.
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Old 04-11-2012, 03:53 PM   #19
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It's been a long time since I've spent any time on supramania or stupidforums but I know you can buy weld on flanges for the CT series of Toyota turbos. They are not very effecient however. At 14 psi the temps are pretty high.
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Old 04-11-2012, 04:09 PM   #20
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That's what I've read about the toyota chargers too.
But he said his is bored out and he changed the internals.
I figured since its free, I'll give it a shot. If its a pain, then I'm leaning towards a gt2860.

Probably gonna stick w the 5 speed fir a while too. I'll get a 6 speed after the one on my car and the 2 in my garage blows. I have a thing for accurate speedo readings.
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