I've got most of the parts I need for my turbo kit except the turbo and the oil lines and FMU. I'm either going to get a t25 or a t3. I would like to know some info from those who run t25's like:

1. when do you first feel boost?
2. when do reach full boost?
3. would you go with a bigger turbo if you could do it over?

I really need some help here cause I'm having a hell of a time deciding what size to go with. I like the idea of having the almost instant boost of a t25 but I don't want to be "in boost" all the time(myth?)...any info is welcome.

 

i have a t25. starting from 2nd gear it starts to pull at 3500 rpms and gets full boost by 4000 or so. i have a exhualst leak from the ex manifold to the turbo so that prob why it spools so slow compare to other ppl. i would definitely have gone with a internal wastegate t3 if i could turn back time. what do u mean in boost all the time?

 

...when I had a T25 on my stock parts, low compression D16...

1) @2000rpm
2) 2800-3200rpm (According to boost level. I ran between 5-10psi.)
3) Bigger turbo...without a doubt!

The T25 was way too small for me. I was in boost at part throttle. I was in boost taking off easily at a stop light. I was almost in boost at the McDonalds drive thru. Also, by 5000-5500rpms it was out of steam. I would opt for anything other than a T25, like a 14b, 16g, T3, etc.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jockobo &raquo;</TD></TR><TR><TD CLASS="quote"> what do u mean in boost all the time?</TD></TR></TABLE>

Well, smaller tubos spool up fast, so if you are cruising at 2k RPMs you might be boosting...read the last guys post about Mcdonalds...that is what I'm talking about.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DSF &raquo;</TD></TR><TR><TD CLASS="quote">...when I had a T25 on my stock parts, low compression D16...

I was almost in boost at the McDonalds drive thru. </TD></TR></TABLE>

lol

 

i have a t25 on a stock d16z6.

1-you can feel it start to pull around 2200. it will blow off as low as 1600 though (most annoying)

2-9psi at about 3500

3-I'm looking for a 14B right now

the midrange power is pretty amazing but it makes nada for peak power. It feels like it's gonna keep going but levels off after 5K.

it is GREAT for auto-X!!! i never have to down shift because of the torque at low rpm. From what I have read I think the 14b or a t3 would be your best bet for a budget setup. a turbo coupe t3 would be prime for a z6.

I can get 5 psi on the highway at about 20% throttle! it stays just out of boost cruising at 80 in 5th. instant power!

I have a stock exhaust and cat w/ a 2.5" DP. it's super stealth except that you can hear the turbo spool and the bov all the time. I figure it could run about a 14.5 1/4.


Modified by Bailhatch at 12:25 PM 12/2/2003

 

sounds like my exhualst leak is really bad...u guys spool up pretty damn fast

 

no way the t25 should be 'out of steam' on any 1.6l.

My t3 acts exactly the same way. I can make boost on the highway instantly in 5th gear, as well as blow off at like 2k rpms if i want to. Run more boost with the t25 and it will keep making power. Eclipse guys manage 300 hp out of them all the time....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Johnyquest &raquo;</TD></TR><TR><TD CLASS="quote">no way the t25 should be 'out of steam' on any 1.6l.

My t3 acts exactly the same way. I can make boost on the highway instantly in 5th gear, as well as blow off at like 2k rpms if i want to. Run more boost with the t25 and it will keep making power. Eclipse guys manage 300 hp out of them all the time....</TD></TR></TABLE>

my t25 is pretty damn small. it's not a DSM one. I will take you for a ride and you can feel it run out of steam. I have run it with open DP and it's the same pretty much, just spools faster. If you ask around and search on here the general concensus is that T25s DO run out up top. Even DSM guys complain of this but they have a motor designed for midrange power, we have engines that make HP way up high so maybe that makes it more of a problem for us.

T3 must be nice. what a/r on your turbine?

volvo huh, I just put one of those on a 2.0 VW. went nice at 7psi. Which car is your from 760?

 

Eclipse guys don't make 300hp with T25s all the time. Most eclipse guys ditch the T25 before they get past 250hp. In theory, the DSM T25 only has enough airflow for 270hp.

As for your comment that the T25 shouldn't be running out of steam on any 1.6L, well, take a ride in ANY car with a T25 on it and you will see what these guys are talking about. On a DSM, it's already starting to run out of steam by 4000rpm. It basically spikes up to full boost and almost immediately starts dropping. On a 1.6L it is fully believable that it would start running out of steam around 5-5.5k. There is only one thing a T25 is good for, that is a nice conversation piece on your coffee table after you upgrade your turbo or blow the ******...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SilverSellout &raquo;</TD></TR><TR><TD CLASS="quote">There is only one thing a T25 is good for, that is a nice conversation piece on your coffee table after you upgrade your turbo or blow the ******...</TD></TR></TABLE>

Easy easy, they are good for auto-x too ya know! I was thinking 3 of them together for a canoe anchor....

man I need a T3

 

&gt;&gt;As for your comment that the T25 shouldn't be running out of steam on any 1.6L, well, take a ride in ANY car with a T25 on it and you will see what these guys are talking about.&lt;&lt;

...Except for mine that is.

My car is daily driven and it only reaches "boost" when I want it to. I really don't understand why it's a "pain in the ***" if my intake mani is at -5 or +2 lbs going through the McDonald's drive through... BOV noise at 1900 rpm's? What a horrifying thought...

Another thing to consider is how many single cammers out there are realistically going to see 250 whp. Not many. Not saying it isn't entirely possible. It's not even all that much trouble, *but* it's still very unlikely for a lot of other reasons besides the size of the snail.

There's also this internet myth floating around that Honda heads flow oh sooo much better than everything else, which just complicates things around here...

My Numbers: Turbo is from a 97 DSM with 54,000 miles. My car weighs 2400 lb (with me). It's a 6G Civic hatch with an "EX conversion" (tranny, head, ecu). It runs a consistent 14.1 @ 101 mph @ 7 psi of boost, with a crappy 2.3 second 60 foot times (15" street tires). I suck at drag racing, but that's not what I'm interested in, and it's not what I built the car for. Not that my times are "all that", but the trap speed ain't bad for a stock sohc at 7 psi with just about any turbo you care to choose.

I also think there is a lot of disparity in the performance people are getting from T25's. Probably because they tend to be of the "junkyard" variety. Who knows what sort of nasty condition a lot of them are in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote"> BOV noise at 1900 rpm's? What a horrifying thought... </TD></TR></TABLE>

Try it for several years. It gets annoying, trust me.

 

yeah, more input please! i have a jdm d15b... sounds like t25 isn't as cracked up as i thought!... i myself am looking for boost from 2.5/3.5k to 7k .... what turbo is suggested/actually done before? also... what a/r?

 

yeah, more input please! i have a jdm d15b... sounds like t25 isn't as cracked up as i thought!... i myself am looking for boost from 2.5/3.5k to 7k .... what turbo is suggested/actually done before? also... what a/r? not really interested in peak horsepower... realistically its a daily driver, and something in the area of 150-180whp?

 

If all you are interested in is 180 whp or so, then a T25 will do you fine. If you actually want the car to be FAST, then look elsewhere...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SilverSellout &raquo;</TD></TR><TR><TD CLASS="quote">

Try it for several years. It gets annoying, trust me.
</TD></TR></TABLE>

Exactly. The T25 is an excellent stock turbo and does it's job admirably. It makes the car feel faster than it really is by bolstering the lower to mid rpm range. Plus it's beneficial to the pig heavy cars like the eclipse (compared to the typical Honda that is).

 

[QUOTE=DSF]The T25 is an excellent stock turbo and does it's job admirably. It makes the car feel faster than it really is by bolstering the lower to mid rpm range. QUOTE]

That is what I'm looking for. Can I find this wth a a t3?

 

fsp31... your right (except about the hyoer sensitive bov), you can really get decent performance out of a t25. There is a guy on here named ITSTOCK who lives a few towns over from me. He ran a 13.9 in an EH2 hatch at Epping, stock dsm t25.

I drive a d16 w/ t25 every day and I drive the **** out of it. We are just trying to say the t25, while easy to find and fun to drive, isn't the best junkyard turbo for sohc hondas. IMO it's all about bigger t3s so it pulls extra hard up top while having a mid to low end that is comparable to the t25.

 

&gt;&gt;IMO it's all about bigger t3s so it pulls extra hard up top while having a mid to low end that is comparable to the t25.&lt;&lt;

I certainly understand that. I was mainly responding to the t25 "haterz" out there who aren't giving the facts.

I just thought of something, and maybe a reason why I'm getting better performance from my T25 than other lister's. I fabricated my own adapter plate (mated to a ported STD manifold), I also did some port matching on the turbo around the exhaust manifold flange. There's also a nasty looking lip about an inch further inside the exhaust housing that I ground off. That alone could cause problems, particularly at higher flow (higher revs). I've never seen how the DSM manifold matches to the T25, but I suspect that lip is covered somehow. Took about 5 minutes with the die grinder...

There's one thing that worries me about junkyard T3's. Unless someone has a good understanding of trim, AR, and the specs of the particular T3 they're looking at, they can end up with a real dog. T3's come on such a wide range of vehicles, and in a weird variety of sizes... For someone still on the steep part of the learning curve, but who want's something slightly larger than a T25, a 14b from a DSM is another great choice because it's cheap, plentiful, can usually be found in good shape, and it's a known quantity.

 

The t25 is ok...but its so puny that u have to run a lot of boost to get it to really move...im running it at around 12 psi to get low 13s and i see the t3 guys pushing 7-8 psi making the same power...T3 juss seems more efficient and t25 start to blow hot air at the higher boost levels...juss my $.02

 

^sorry about my double post... but like above, the t3 comes from so many different vehicles, what are your setups, which ones are proven power?

 

Although my engine is not a Honda engine Im running a T25 on my car. I have ran a best yet 13.77 and that is on stock boost. which is about 7-8psi right now. I would like a bigger turbo but not really concerned with it now. I can stay out of boost easily on my car and it doesnt go into full boost until 3500-4000 I think! If I was building a budget turbo kit for a Honda I would hesitate to get a T25 if you can get ahold of one in good shape for cheap. That is just my opinion though.

 

I had a T-Too-Small on my ZC...

1. about 2000 with a dawes device boost controller.
2. 2800 in 2nd
3. YES. I would have at least gotten a T3 super 60.

The reason I didn't like the T-25?...

The turbo is SOOOO small even for the small Honda motors, that it falls on its face around 5500rpm.

It will pull hard as soon as you reach full boost, and then seem kinda lame after 5500 till redline.

 

Unless you are making in the neighborhood of 230 whp at 5500 rpm's then it's not the turbo. Fact is, a T25 is efficient until flow rates reach well in excess of 200whp, regardless of rpm's. Yeah, a larger turbo on the same system will improve top end performance, but it's simply making up for some other inefficiency in the system. It may be a boost level issue. With our "hacks", most of us (including me) are running less boost than these turbos were meant to deliver.