J_yuk05

about how much hp will a t25 or a 14b turbo put out on a d16y7

Slo_crx1

t-25 is smaller than a 14b, usually maxes out around 200-ish hp. 14b can put out enough air to sustain 250 without air temps getting too high.

J_yuk05

but is it true that the t25 comes with 10psi and my pistons can only go up to 8 psi safly right.? cause i was leaning towards the 14b cause every thing i read says that they were better turbos any way. but i am just using the car as a daily driver so i only wanted around 200hp any way. and i think the 14b was 10psi also im not sure. plz coorect me if im wrong with any of this...

Slo_crx1

Wow...where are you getting your info? I'm not sure if I'm reading it right, but you're talking about the stock wastegate's being set to 10psi? Settings won't be an issue if it's properly tuned, not to mention 10psi from a t-25 will still be below the 200hp level. Max I ever saw from a t-25 on a d16 was 211hp @ 17psi tuned on a dyno with Hondata.

J_yuk05

i understand that the t25 will still give me the 200 but i was reading a thread on one of the websites not sure which one but they were saying how my motor waent strong enogh for more then 8lbs of boost if i understood it right it is a d16y7 with a few upgrabes cams pulleys clutch fuel rail and a few others. and also is it true that the 14b is a better turbo?

Slo_crx1

Yes, the 14b is a much better turbo. Whoever told you your motor wasn't strong enough for over 8psi is a retard, you can even tell him I said that lol. CFM flow is much more abusive on a motor than pressure is. Think of it like this...take your motor with a 14b @ 12psi against the same motor with something much larger...say a t3/to4e (we're going to assume that it'll be properly sized for argument's sake even though it's a very bad matchup). Say that 14b combo produces 250cfm at 12psi and lands in the 80-90% efficiency range on it's compressor map (not exact numbers, just for illustration). You are putting 250cfm of cool forced air into your motor...detonation is low due to low intake temps, and timing and fuel are tuned properly. Take now the t3/to4e at ohh, say 8psi. Say that to4e produces 400cfm at that pressure. Most people would think it's safer because the psi pressure is lower right? Wrong. At 8psi that to4e is on the low side of it's efficiency range, maybe in the 60% (also not a correct number, just for illustration) range. Because it's efficiency is so low, heat temps rise dramaticly. More fuel and less timing are used, raising exhaust temps which can transfer some more heat over to the compressor side, raising temps even more, increasing chances of detonation. Detonation kills engines due to the extreme amounts of pressure created, well beyond that 12 or 14 psi mark.
All the numbers I put down here are not actual numbers though, so keep that in mind if someone thinks they're going to be funny and flame me for it...it's just to illustrate a point. Just keep in mind it's really not the psi you run, it's the cfm and where it lands in that turbo's peak efficiency range that counts. Rule of thumb is choose a suitable power goal (like 200hp) and match your turbo to that goal using the smallest possible turbo to achieve it, and tune it well. Your engine and your wallet will thank you.

J_yuk05

well 200hp was the power goal that i chose so u told me in a reply that the t 25 would just be under the 200 so if i go with the 14 b it will be right around the 200-210 hp range if tuned properly. or should i go with the t25 tuned properly since it is smaller and cheaper to the wallet. i dont mean to be a pain about this but i am acctually understanding what you are saying most of the time.

Slo_crx1

Glad to hear it...most noobs don't care to hear this stuff. Since your goal is 200-210hp go with the 14b. The t-25 can do it, but it'll be stressed out pretty bad, meaning way out of it's efficiency range to do so. At that far out of efficiency it'll pretty much blow all hot air, increasing your chances of detonation. I should clarify my previous statement...choose the smallest turbo possible within the peak efficiency range for the power goal you want.
As far as the cheaper part goes, you can still grab 14b's for $100 and less.