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I'm not sold on needing a large turbo at all. My car is not going to be a track car just looking for a little more power for passing and climbing hills ( a fair amount of those around me). My plans are to start with engine management and maybe even a larger engine even though I like the idea of keeping the original engine in the car. I like the way a turbo car feels when driving it, the feel of the turbo boost kicking in and improving the acceleration.
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Originally Posted by Full_Tilt
(Post 1324)
In fact, I would argue the counter-point that a larger turbo will be harder on the driveline because it will come into power all at once. In other words the derivative of the powercurve will be greater at that point.
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MiataTurbo.net will have answers for most anything FI. You will need to put on a flame suit for most of it though.
I am kind of on the fence with what Full Tilt said. Yes going with a bigger turbo will put down more power but it also gives you some more RPMs to play with before you get into boost, but like you said it comes on like crazy. That's why I think a boost by gear setup, or what Brain said, a TPS based boost controller would be ideal for what he is trying to do. But I mean really I think doing all this work to avoid the stress on the 1.6 drivetrain components is just too much work. As long as you arent launching the car, do huge brake stands, brake boosting...etc it should hold up long enough for you to do your swap later on down the road. And 1.6 stuff is cheap. If it breaks throw in another one. |
Originally Posted by RyanRaduechel
(Post 1380)
MiataTurbo.net will have answers for most anything FI. You will need to put on a flame suit for most of it though.
I am kind of on the fence with what Full Tilt said. Yes going with a bigger turbo will put down more power but it also gives you some more RPMs to play with before you get into boost, but like you said it comes on like crazy. That's why I think a boost by gear setup, or what Brain said, a TPS based boost controller would be ideal for what he is trying to do. But I mean really I think doing all this work to avoid the stress on the 1.6 drivetrain components is just too much work. As long as you arent launching the car, do huge brake stands, brake boosting...etc it should hold up long enough for you to do your swap later on down the road. And 1.6 stuff is cheap. If it breaks through in another one. |
Originally Posted by loki34
(Post 1341)
I'm not sold on needing a large turbo at all. My car is not going to be a track car just looking for a little more power for passing and climbing hills ( a fair amount of those around me). My plans are to start with engine management and maybe even a larger engine even though I like the idea of keeping the original engine in the car. I like the way a turbo car feels when driving it, the feel of the turbo boost kicking in and improving the acceleration.
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Regardless, any 89-93 miata with a FI and/or good tires, needs a 1.8 rear diff.
Handicapping your setup to try to save a differential that apparently is made out of wood cogs does not make much sense, its most certainly going to break, so you just gotta suck it up and do it right from the beginning. |
Have done some searching on MiataTurbo.net but as a beginner it's hard to wade through all the post that come up under each search, that's why I asked here first. Beside my flame-retardent suit is to small now so here's two more questions. I just aquired a AiResearch M11 turbo with .60 on the coldside and .48 on the hotside, is this good enough for a low boost set-up? And question two, the exhaust is always turning the turbo so am I right to assume that the waste opens and allows enough exhaust to by-pass so that the vacuum produced is greater than the boost produced?
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when the wastegate is opened, the exhaust gasses bypass the turbine, slowing the wheel, limiting the about of boost the compressor makes.
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So your saying that once the car starts and in running the engine is always under boost? Even at idle there some boost present. I had an '87 shadow turbo with a boost gauge but don't remember if it had a vacuum reading on the gauge or just boost.
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no. the turbo isnt spinning fast enough to make boost. you're under the same vacuum as N/A
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