Td04-15 vs 2554 vs 2560 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-02-2008, 03:17 PM   #1
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Default Td04-15 vs 2554 vs 2560

I didn't think there would be a differance of that extreme.

My cousin has a Delsol with the greddy IC & TD04-15G turbo.

We finnaly got everything finnished yesterday. So we try it out. That thing is inst'O-boost crazy. You can't keep it out of boost. When you drive normal it has no vaccume. I was woundering if the wastegate was set wrong. But it never goes over 5psi.
At highway cruise speeds the car is pushing 4psi.

With my girls 2554 I don't run much vaccume on highway but I do run some. Mabe his downpipe and exaust are better???? Hmmmm...

Then I jumped back in mine with the Older FM2560. Man total differance.
I can drive it normal. It seems like it takes a moment to get boost comparetively. But when it comes in it, is way more powerful than his.
And at highway cruise mine runs -20 vaccume. Even at 80mph. And it takes micro anticipation to get the boost in. But when it comes, Here We GO!

What vaccume or boost are you guys with 2560's running at 80? I'm woundering if some changed mine up a little or if that is normal and expected.
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Old 09-02-2008, 03:22 PM   #2
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I. That thing is inst'O-boost crazy. You can't keep it out of boost. When you drive normal it has no vaccume. I was woundering if the wastegate was set wrong. But it never goes over 5psi.
At highway cruise speeds the car is pushing 4psi.

With my girls 2554 I don't run much vaccume on highway but I do run some. Mabe his downpipe and exaust are better???? Hmmmm...

Then I jumped back in mine with the Older FM2560. Man total differance.
I can drive it normal. It seems like it takes a moment to get boost comparetively. But when it comes in it, is way more powerful than his.
And at highway cruise mine runs -20 vaccume. Even at 80mph. And it takes micro anticipation to get the boost in. But when it comes, Here We GO!

What vaccume or boost are you guys with 2560's running at 80? I'm woundering if some changed mine up a little or if that is normal and expected.

And we are sure this guy hooked his boost gauge up correctly? It seems a bit odd that he's pushing 4-5 lbs at cruise. I believe when I cruise I sit around 10 vac to 0, depending on throttle position. And yes, there is a "micro" anticipation prior to boost.
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Old 09-02-2008, 03:30 PM   #3
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I've had both the mitsu td04-15G and the 2554R on the same car. The difference in spool is nothing less than incredible. The 2554r spools so much faster than the td04, it isn't even a contest.

Something is up.
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Old 09-02-2008, 03:32 PM   #4
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I wonder if he has connected the boost gauge to the intake tract between the compressor and then throttle body, rather than between the throttle body and the head? This would account for a complete absence of vacuum, and perhaps even a pound or two of positive pressure at cruise.
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Old 09-02-2008, 03:32 PM   #5
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I don't think anyone here with the Greddy kit (td04h-15g) would describe it as constant boost....in the scheme of things, it's not even that small of a turbo.

the compressor wheel itself look to perform almost identically to the 2560 wheel. a touch less airflow capacity.
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Old 09-02-2008, 03:58 PM   #6
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Thanks, I'll look to see where the boost gauge is hooked up. We didn't get to get on it much. We had to limp it home due to he forgot to bring the missing link for the map sensor. It went into safety mode fast. Once it hit safety mode, I basically just watched the gauge as he was trying to drive the car without messing it up.
He should have it on by the time I get off work. I'll drive it and see if it is boosting. And check the orientation of the vaccume lines.

Last edited by Toddcod; 09-02-2008 at 04:20 PM.
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Old 09-02-2008, 04:05 PM   #7
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Could be the Del Sol's vtak kicking.
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Old 09-02-2008, 04:06 PM   #8
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all i'll say is this thread and the questions posed in it are moronic.
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Old 09-02-2008, 05:35 PM   #9
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all i'll say is this thread and the questions posed in it are moronic.
+1. The vac. or boost you make while cruising depends on your throttle position. I don't see how a car could never make vac.
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Old 09-02-2008, 06:15 PM   #10
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+1. The vac. or boost you make while cruising depends on your throttle position. I don't see how a car could never make vac.
If you would look at your gauge you'll see the negative maker. Watch it. When it reads on the negative. That means vaccum.

positive number = boost
Negative number = Vaccume

I got something moronic and erotic for you.
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Old 09-02-2008, 06:18 PM   #11
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I find it hard to believe it's never in vac as well. At cruise you don't need much throttle to keep going. Are you sure he doesn't hava dragging caliper or something?
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Old 09-02-2008, 06:25 PM   #12
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I find it hard to believe it's never in vac as well. At cruise you don't need much throttle to keep going. Are you sure he doesn't hava dragging caliper or something?
I called him a little while ago to get him to check the lines. He said the gauge pulls vac and then to boost and reads correctly now. Even in cruise. He said he didn't change anything. Wierd huh.

I bet he needs to find another place to splice into.
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Old 09-02-2008, 06:31 PM   #13
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unless you are towing a house or climbing a crazy incline you're in vacuum in cruise. Otherwise you'd be accelerating. Think about it. This del sol you speak of, could it cruise at highway speed before? If yes it was doing it with no boost. Now all the sudden that it has a turbo it needs boost to cruise at the same speed under the same conditions? NOT! A car like the del sol needs like 10hp to cruise. It's kinda the definition of cruise no matter what your speed. Once the car is moving a given speed, it takes very little power to maintain that speed on level ground.

Maybe it's the huge wing he most likely has on the trunk.
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Old 09-02-2008, 06:44 PM   #14
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Originally Posted by Toddcod View Post
If you would look at your gauge you'll see the negative maker. Watch it. When it reads on the negative. That means vaccum.

positive number = boost
Negative number = Vaccume

I got something moronic and erotic for you.
At some point, I had hoped you would catch on that the word is in fact, "vacuum". Now, that being cleared up, I think the members of this site know how to read a boost gauge. Thank you, however, for the tutorial.
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Old 09-02-2008, 06:51 PM   #15
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I'm confused though. My "boost" gauge doesn't have any negative numbers. Just postive numbers on the left that say InHg and on the right they are positive and say PSI. ****! Maybe I am always in positive manifold pressure. I'll get the sharpie out and fix my lil boost issue.
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Old 09-02-2008, 06:56 PM   #16
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I'm confused though. My "boost" gauge doesn't have any negative numbers. Just postive numbers on the left that say InHg and on the right they are positive and say PSI. ****! Maybe I am always in positive manifold pressure. I'll get the sharpie out and fix my lil boost issue.
Mabe you should stick that sharpie up your ***. That might relieve your ---- tensions.

And the car did go to vacuum at stops. That was the wierd thing.

Jeez guys! It is time for beer and a strip club.

And it probably was the wing.
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Old 09-02-2008, 07:00 PM   #17
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Should I do that while doing the?
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Old 09-02-2008, 07:06 PM   #18
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Should I do that while doing the?
It would pobably be more fun.
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