How would the s15 t28 perform...

Post by **lovenismo** » Wed Mar 17, 2004 8:21 pm

Soon enough I will have a 91-94 rebuilt ka24de. My question is would this turbo be effective enough. I've read how a t25 would spool too quick or somewhere in those lines... My ears are dripping still. I dont really want to go the usual t3/t4 and from what I've heard the s15 t28 is a great turbo. Any input would help me out yall thanks.

Post by **ftrs13** » Wed Mar 17, 2004 8:21 pm

I think it would work, I dont know the exact specs, but there are enough people running some form of T25, that a T28 would be an upgrade.

are you able to get this turbo at a big discount or something? most people go T3/T4 because it is the most efficient, with a good spoolup time, and it also has a higher boost limit than the others. most people choose it because it is a really good, relatively cheap turbo.

find the compressor maps, and look at those to determine what is best for you.

Steve

Post by **lovenismo** » Wed Mar 17, 2004 8:21 pm

I wasn't really looking for huge horsepower so I thought the s15 t28 would do my goal of about 220+whp as a permanant setup. What I mean by that is once my block is built and tuned to a comfortable level I wouldn't screw with nothing but maintaining my setup for a long life. O yeah, no discount (yet!) Maybe such a small setup wouldn't be worth the money if I can get a nice t3/t4 setup right for the same or less amount. What could I read to educate myself more about a turbo and how they work. I know the basics (well) where they go and what they do with a motor but we all know I need to know a heck of alot more than "the snail thingie goes on this side". Thanks Steve.

Post by **andrave** » Wed Mar 17, 2004 8:21 pm

A T28 would spool fast and probably be large enough to hold boost to redline. Its a very modern, very efficient turbo. The only problem that I see is that all the SR guys (or anyone with a T25 who wants an upgrade) are snapping them up, and as with the S15 R injectors, there aren't a lot of them. So you are going to pay at least 500 dollars for one in decent shape. For 500 bucks, you could get a NEW T3/T4 or t04b or whatever. But it would probably work if you could find one.

Post by **ftrs13** » Wed Mar 17, 2004 8:21 pm

get corky bell's maximum boost, it has everything from the basics to advanced. its all how much time and effort that you want to put in.

its the place to start when designing your own turbo system

Post by **toki** » Wed Mar 17, 2004 8:21 pm

Quote »How would the s15 t28 perform...[/quote]10% more effeciantly than the s14 T28?

bwuahaha I love people who think s15 turbos are teh ultimate ****...AND ONLY 800 DOLLARS! WHAT A STEAL!

Post by **lovenismo** » Wed Mar 17, 2004 8:21 pm

Hey toki I just heard it was faster spooling etc. I've done alot of research and I'm leaning toward the t3 super 60. I dont know the exact trim bacause of so many different setups I've seen but with an .63 a/r it sounds good from my knowledge.(not awhole lot jack!) I will try to get ahold of corky bell's maximum boost book though, thanks ftrs13!

Post by **MikeMurphy** » Wed Mar 17, 2004 8:21 pm

Grab a t3/t4 combo man. Why? MUCH larger compressor which will yield you far more ponies-per-psi. If I remember correctly, the T28 still has a very small turbine similar if not exactly the same as the T25. You could still run a straight T3 setup or a T28, but its hard to ignore the gains of the larger compressor. These gains are real.

And yes, as mentioned earlier get yourself a copy of Maximum Boost. Very informative!!!

Post by **hayato kazami** » Wed Mar 17, 2004 8:21 pm

i have a best motoring (hot version) video, which is the time when S15 come out not too long, you know how they like to get the new car and race it. Orido have a new S15, using stock turbo, i believe it was about 300 to 320 hp, it beat 3 turbo IS300, which they have about 400hp!

At end they said, response is better than huge power.

S15 T28 is a great turbo!

Post by **ftrs13** » Wed Mar 17, 2004 8:21 pm

yes, I enjoy my car more, because with my z31 T3, I get instant boost whenever I drive above 2500rpm. Im trying to learn how to read compressor maps to figure out if its the right turbo for my goals.

damn those things are tricky

Post by **lovenismo** » Wed Mar 17, 2004 8:21 pm

I'm not at all trying at all to do wheelies with my car. From what I've heard the t3 in some shape or form sounds like my best bet. Say if I did go with a t3/t4 with the right setup when would boost come on and what would power figures look like. You know what guys forget that. I need to search because I've seen tons of dyno sheets here at nico with just as many setups.

Post by **ftrs13** » Wed Mar 17, 2004 8:21 pm

exactly, my power goals lie at about 220-250, which I think I should be able to reach at 10psi. the boost with a T3/T4 isnt that much delayed from the regular T3s, it would come on about 3500, maybe even a little less. I would have gone this route if I hadnt gotten my turbo at such a good deal. I had one picked out and everything, but now Im happy with what I have. what year is your car? there have been several people that had very good numbers on a T25. those were in s14s. you can tweak a few extra hp out of a lot of things in your setup, so the turbo is less important at the low boost levels(below 10psi). depending on your future goals, you have to make your own decision about which is right for you.as a side note, Im also happy with my T3 because I cant boost too high. if I had a T3/T4, Id probably be finding some way to turn the boost up to 15psi, but now, Im actually doing work and sqeezing hp out of my current setup

Post by **toki** » Wed Mar 17, 2004 8:21 pm

hayato kazami wrote:S15 T28 is a great turbo!

Yes, it is great if you have a 2.0L motor, it is specifically designed for them. Unfortunatly, the KA doesn't quiet fall under that catagorie.

lovenismo, I would say go with a t3/t4 hybrid, .48AR. It will only be good to 14psi or so, but it will get you there quick. You shouldn't have a problem landing well above 300 at the wheels safely, if you are properly tuned.

Or you could just wait for WDRacings turbo kit to be released, it is priced to sell and comes with everything you need!

Post by **ftrs13** » Wed Mar 17, 2004 8:21 pm

haha, everyone is waiting for WDs kits to come out

they look great, and have a good price, but there is going to be a wait list that goes across the country.

back to the point, Id say that .48AR is a little to small, I would go with a .63, will spool a little later(not much at all), but you wont have any problems with compressor surge, and you will hold better boost through to redline.

and I just realized that most of the people on this thread drive an 89 ... SOHC POWER!!! :ylsuper

Post by **SingleCamSam** » Wed Mar 17, 2004 8:21 pm

S15 T28 will work great on a KA. The GTiR turbo is a slightly cheaper alternative.

Post by **lovenismo** » Wed Mar 17, 2004 8:21 pm

A Sam for what reasons would the s15 t28 work great on a ka. I'm more looking for actual facts and proven attempts not what's cool

Post by **silviamaniac** » Wed Mar 17, 2004 8:21 pm

I think s15 t28 is way too small for KA. If u want faster spooling and not high HP gain, and since u are looking at used turbo, you probably can look into t3 off rb25det.

Ball bearing center(fast spool), Ceramic turbine wheel(low inertia, fast spool), plastic compressor wheel(low inertia, fast spool!). Everything combined u get a very fast spoolingt turbo. Friend had it on an CA18 back home, real great result.

The only problem is you cant go more tha 12psi, or the turbine wheel will break (Ceramic = weak). Which i think is a good thing for most KA, since they dont see boost more than 10 in normal case. Plus rb25det is 2.5L, KA is 2.4L, compatibility wise, no problem.

However, its really hard to source a good condition one because most of them had been abused.

How would the s15 t28 perform...

How would the s15 t28 perform...

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