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Demon, If the t-28 is most efficient at 2-6.5krpm than thats what I wanted anyways. No more 7600 rpm for me. Thanks!
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what turbo model would get 300-320 crank hp on a 2.5l and be very reliable as a daily driver (likely running a dual boost, lower boost for daily driving). this would be mated to an intercooler also. everyone says if your gonna open up the 2.5l for forged internals, u might as well 3l it first but that more money. i just would want to take the necessary steps to prevent blowing up the 2.5l. i wouldnt need 350-400hp for my daily driver.
Hugo AIM:omegazodiac
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Originally posted by hmouta:
what turbo model would get 300-320 crank hp on a 2.5l and be very reliable as a daily driver
Gee. A T28 maybe... 
2000 SVT #674
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It was not broke; Yet I fixed it anyway.
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Originally posted by BStoneMega:
Demon, If the t-28 is most efficient at 2-6.5krpm than thats what I wanted anyways. No more 7600 rpm for me. Thanks!
However you wanted to run higher boost???
The T28 could make a little more boost below 5000rpm but it would rapidly bleed off as the rpm increased as it could not sustain it very well. Also you would be pushing considerably hotter air so the point of diminishing returns is already at hand.
Maybe "nicer" dyno queen numbers but pointless in real life.
With more boost down low you run across even more traction problems! You really want to run less boost down low (below 5k) and more boost up high (5-7k)
You are just not going to get any real traction in our platform.
The 270FWHP plateau is it's "real" limit and that's already stretching it's efficiency range.
Again I am not saying it's a bad turbo just stating it's range of operations. It is an excellent choice for an overall power curve. It is just small IMNSHO. (insert Tim Allen grunt here  )
You also made it sound like you wanted more power then a T28 could deliver. (the comment about raising boost)
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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I want to have a useable power range without killing the engine. If I have to baby it in the low rpm than so be it. I know I didn't like my setup with the supercharger and the lower final drive I have. So I'm hoping this t-28 will compensate for that down low loss of power. I guess I don't really care about pushing more than 10psi efficiently right now. But then I guess when you have a turbo that is capable of pushing over 10psi effiently than I wouldn't have all the instant boost that cause traction issues anyways.
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kinda. if the max is 10psi, i wouldnt feel comfortable running it at 9-10psi. so i'd prefer to run a model that can go a bit higher even though i wouldnt run it higher. like running a turbo that would put out 350 but use 300 of it, rather than maxing it out. if that makes sense.
Hugo AIM:omegazodiac
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but how come my t-25 can run up to 15psi supposedly. I would figure the t-28 could go higher?
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Originally posted by BStoneMega:
but how come my t-25 can run up to 15psi supposedly. I would figure the t-28 could go higher?
You are not seeing the entire picture.
Boost level and cfm flow are engine size & volumetric efficiency dependant. (using the "exact" same turbo - otherwise that adds a lot more variables!)
Also like stated the many turbo variables change the turbo's efficiency range. For instance a 50-1 trim "likes" high boost (~2bar max) and a 57-1 moderate boost (~1.4bar max) and they both max about the safe cfm level even though the 57-1 wheel is technically larger.
Just using the compressor maps and not taking the particular engine into account; nor is it taking into account the added heat and turbo rpm, nor exhaust wheel, nor... You get the picture.
Read my other very basic posts about it...
Even google search - IIRC there is a Stealth site that explains a lot about turbo sizing with more detail. (I.E. no way in hell I'm typing out even a layman's guide to it  - my posts should be good enough to get the picture if you are going to get it easily)
Anyone who rates a turbo in "exact" cfm per psi or HP or whatever is not telling the whole story (I.E it's like marketing performance parts)
The T28 could probably support 15psi on the Zetec (2L vs 2.5L) thus giving you a 260FWHP Zetec... ZOOOOOOOM...
No I did not do "the math" it was just a "guesstimate" to be used as an example.
2000 SVT #674
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ok, so a turbo will perform differently on every engine that it is put on even if the turbo is identical. So it could take some real hard core calculations and measurements to come up with a turbo that does exactly what you want in your paticular engine. Thats cool.
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Originally posted by Keyser:
My turbo of choice is .57 trim compressor with a .63 AR for the turbine housing. IIRC it pushes 49lbs per minute compared to the 31lbs from the T28.
What are you putting down now with the new t3/t4 in?
My goal is 350fwhp, and max boost at 3.5k or above is fine with me, like Demon said, lower gears and rev's are virtually useless with the numbers we're talking about here. . .
as a side note, it SUCKS having the superbowl in your city, everybody thinks everybody is a celebrity, some teeny bopper came up to me and asked for my autograph, apparently I look like that guy on 'THat 70's Show' (fez?). . .GO PATRIOTS!!!!
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