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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 07-24-2006, 09:28 PM   #1
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I guess this is my intro thread... hi

Anyways, my friend gave me this link to a calculator. It's technically a thermodynamic flow calculator used to calculate torque with certain input, but it can be used to help match a compressor to the engine using the specs of the engine and one's power goals.

Calculator Link

I'm wondering if anyone has the following numbers for a stock 94-95 1.8 engine:

-Air Fuel Ratio
-Specific Fuel Consumption
-RPM: I'm not sure if it's asking for where the horsepower or torque peaks or where the redline is...
-Volumetric Efficiency
-Max Injector Duty Cycle
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Old 07-24-2006, 09:53 PM   #2
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What a waste of time....Just go off what everyone else has used and worked with...I'm using a nissan t28 turbo on my custom kit, most use t3's though.


edit: this is for an approx 200whp set-up.
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Old 07-24-2006, 10:18 PM   #3
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Lol, thanks for the advice... my friend recommended I go there to find a good match, but if that's the general consensus I guess I can just skip it

Anyway, I'd like 200-220 whp... I'm trying to decide between a T25, T28, T3 or depending on my financial situation, a new GT2554R. I'd like to get one of the first 3 along with a BEGi mani/dp just to make things a little easier
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Old 07-24-2006, 10:21 PM   #4
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Do a search on here you'll find tons of info on those turbo's and similar set-ups ppl have. I have the same goal, approx 200whp, my t28 will putout just over that before it becomes too inefficient (about 220whp). Good-luck


-Dean
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Old 07-24-2006, 10:27 PM   #5
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Quote:
Originally Posted by dc2696
Do a search on here you'll find tons of info on those turbo's and similar set-ups ppl have. I have the same goal, approx 200whp, my t28 will putout just over that before it becomes too inefficient (about 220whp). Good-luck


-Dean
I've done some searching... this is where I got those turbos from, they seemed to be the most common choices among you all for trying to hit 200whp. But I thought the T25 becomes inefficient once you try to push it over 200whp while the T28 could go higher, like 250 or so
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Old 07-24-2006, 10:48 PM   #6
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t25 I would say about 175whp, nissan t28(off a 300zx) good for 220whp(good spool still)
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Old 07-24-2006, 11:44 PM   #7
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No, the T25 (well, the GT2554, at least) is good for about ~225-245rwhp; there are three people on the Miataforum right off the top of my head that're running in that range with that turbo.

The T28 (or GT2560) will be good for ~275-300rwhp tops. Quite a few folks have run those right up to the brink with their FM II kits.

If my goal were under 225rwhp, then go with the T25 all day long. Above that, T28.
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Old 07-25-2006, 12:26 AM   #8
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Quote:
Originally Posted by bripab007
No, the T25 (well, the GT2554, at least) is good for about ~225-245rwhp; there are three people on the Miataforum right off the top of my head that're running in that range with that turbo.

The T28 (or GT2560) will be good for ~275-300rwhp tops. Quite a few folks have run those right up to the brink with their FM II kits.

If my goal were under 225rwhp, then go with the T25 all day long. Above that, T28.
I was pretty sure that's the general consensus I had gathered... thanks for the input
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Old 07-25-2006, 12:37 AM   #9
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Oh, you must've gathered that correct information in a different thread/forum, as I was trying to correct the misinformation that dc2696 had given in this thread.
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Old 07-25-2006, 12:56 AM   #10
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Quote:
Originally Posted by bripab007
Oh, you must've gathered that correct information in a different thread/forum, as I was trying to correct the misinformation that dc2696 had given in this thread.
I did a lot of searching on this board before I posted... that's what I was referring to
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Old 07-25-2006, 01:40 AM   #11
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Calcs like that are They only work on theory and do not take into consideration "real world" factors (variances in parts, temp, weight, etc.)The only one that is worth a **** is the com[pression ratio calculator adn the aformula has been used since day one......
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Old 07-25-2006, 08:58 AM   #12
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I would wholeheartedly disagree that using math to figure out how much the volume of air is that your stock engine moves in order pair it up correctly with a turbocharger is not B.S.
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Old 07-25-2006, 01:10 PM   #13
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Alright, after speaking to a friend of mine, I'm trying to decide between a 14B and a T3. I'd like to go with the 14B as it fits my power goals, but I'm also partial to the T3 in case the power bug bites again further down the road...

Since my friend isn't very familiar with miata's he wasn't sure about this question: are the flanges for the 14B and T25 the same? I was really interested in getting the BEGi mani/dp combo for the T25 so would it fit the 14B also, since the 14B and T25 are so similar?
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Old 07-25-2006, 01:17 PM   #14
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When I was deciding on my turbo, I decided to err on the side of bigness. Not many people go from big to smaller turbos on their cars.

A mitsubishi flanged turbo will not fit a begi mani. standard T2 or T3 only.
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Old 07-25-2006, 01:30 PM   #15
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Quote:
Originally Posted by Al Hounos
When I was deciding on my turbo, I decided to err on the side of bigness. Not many people go from big to smaller turbos on their cars.
Lol, true...

Quote:
Originally Posted by Al Hounos
A mitsubishi flanged turbo will not fit a begi mani. standard T2 or T3 only.
Yeah my DSM friend just informed me of the difference between the DSM T25 flange and the regular T25... damn
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