Looking for an extremely fast spool (as fast as possible) while still making around 350whp (400whp is the very most I'd be looking for), with as low a psi as possible (was hoping not more than 12psi... 14psi at very max)...

Will most likely be using a cast manifold such as a RevHard or IP unless I can get my buddy to make me a custom tubular.

EMS will most likely be AEM 1052.

So what do you guys think? GT25RS too small? What about GT2871R... still too small? What psi would I likely have to run with those to make 350whp?

What about a GT30 of some sort? How fast would that spool? Any ballpark as to what RPM it would start to boost? hit full boost?

Pros and cons of each?

And yes, I searched, but as always the search feature sucks and the results/posts are inconclusive.

Any help/advice/info is appreciated!

Thanks.

 

All the info you need
https://www.s2ki.com/search

 

get a GT30 very fast spool..sounds sexy and you'll attain your power goal and there will be room for growth after you start itching for more power


i dont know why people want a Bloody a$$ fast spool with this car and the great high end #'s

This car was strictly built to make power after 6k rpms... why not build it in the direction were it will only stack the benefits on top of each-other... High end power making turbo + High END POWER MOTOR!

 

I'm really not a rude person, but seriously stfu and gtfo of my thread with that bullshit. It's obvious I've already done some research. Everyone knows the search feature isn't the best on this site. I'm really tired of retarded posts like "search is your friend" or whatever.

Any idea what RPM it would start to spool? or what RPM it will reach full boost?

Not sure the motives of everyone else, but personally I'd like a fast spool to even out the car a bit more. I feel like before 6k RPMs is when it needs the most help. The car is my DD, not a race car. If I was trying to build a drag car, a road race car, or similar then I'd see your point. But from stoplight to stoplight I'm not looking to hit redline everytime, but it sure would be nice to have some more bottom end. See my point?

 

wes87 is right tho,

i started doing my turbo searching about 3 years ago. and even then i Never asked questions. because it was ALL in the search engine... literally 10 years of the same questions people like you have asked.

theres literally about 2-3 new turbo threads a week. I've always used the search and the answers Are there. just gotta search


well... you figure that we all drive around 3000 rpms All the time.. i'd say u would make full boost by 3500rpms. and start spool as early as 2000rpms

If you got Ivtec however :-D hahahah you'd start spooling sooner and make full-boost sooner.

Yeaaa!! before 6k rpms the engine is a dud but, thats how it was designed.

since its your DD, get a greddy kit.. Cheap.. makes low-end power and should be suitable for your needs..but then again it wont make 350 lol. stick with the GT30 and ull be perfect

 

A 30r with a small hot side will spool fast and if yo uare looking for a little more top end power later just change the hot side out to something a little bigger. A 30r is gonna take 14psi at the very least on a log mani to get you to 350whp.

 

No, he is not right. There is a decent ammount of info about the GT30, but very little about the GT25 and GT28, and what there is is either very little, very opinionated, has very little factual information, or all of the above. For example all in all I saw ONE post/thread with a dynoplot of a GT2871R, and he was running a Full Race manifold (which I'm sure flows much better than a cast) and never even posted a final dynoplot with updated injectors/aem ems and final tune... as I said... pretty incomplete...

I don't think I've seen much of any information at all about the GT25RS (on an S2000) except some speculation/opinion. Feel free to prove me wrong.


That's good that you did all your own research and never asked any questions, but not everyone is like that, some topics are harder than others, and more than anything, thats what a forum is for... asking questions.

I'm sure there are plenty of turbo threads a week but I'm guessing those are fairly generic. I'm asking for a pretty specific answer for a pretty specialized setup. Most people are just looking to make 400-500+hp and throw a GT30 or GT35 on there... as I said, this is an attempt to more or less make an "ultimate DD" turbo application for small boost/small power/small cost, but good response/spool.

Thanks for the info, 3-3.5k doesn't seem too bad at all.

Just because the engine is a "dud" below 6K and was designed to be that was does not mean thats the best for everyone, nor that it should stay that way. In some cases sure, but not in all cases.

The Greddy kit some liks a POS to me. Maybe I'm wrong but it just seems cheap and not worth it to me. I'm pretty sure I can build this custom setup for as much as the greddy kit would cost (maybe less) and have met all my goals.

 

get gt3071r super fast spool I love it

 

Berlinas2k rocks a greddy kit, he says he gets full boost at 2500rpm but his isn't a stock greddy kit. He has a bigger downpipe, no cat , exhaust, and he's running k-pro instead of e-manage. From what I've skimmed on the forums though greddy kits are crappy in that their manifolds will crack and the company has terrible customer service.

Before my S, I had a Nissan 240SX with a SR20DET, I put in GT2860RS pushing 1 bar, I hit full boost on that motor ~3500 RPM but then the besides the displacement I would image the two engines are completely different.

 

I run the f24c with a gt28rs with a redline of 7000rpm.. I hit MAX power at 3800rpm, with vtec coming on around 4500 rpm. I wouldnt recommend a turbo this small for a motor that goes to 9,000+, for the range your looking for i would say a gt3071r.
I wouldnt go tubular manifold if your looking for quick spools, i would stick to a log manifold, try EBAY for an STR manifold , i payed $160 and havent had a problem.
Second, i dont know how much you know about these motors, but the f20c/f22c is a fire breather to began with. There is a reason why theres arent very many gt25 or gt28's if any except mine lol it just isnt that practical with this motor. This isnt an sr20, where an upgraded gt28rs is going to just make the motor go nuts.

What is the point in owning a car like this if your not going to use the full potential of this motor. I think your better off with a CAI and exhaust if thats what your lookng for