I have a 95 Civic EX sedan with the stock D16z6 and a t25 turbo. I have really enjoyed the increase in power so I picked up some pistons and rods. CP pistons, Eagle H beam rods. After the build I will probably want a bigger turbo and I think I am aiming for 250-300 hp and am wondering:

Should move up to a bigger turbo or can I just turn this one up enough to get into that range? (I always hear that the t25 is too small)

I am mostly wanting to know more about trim and A/R and if my motor being of smaller displacement and a SOHC if the ideal turbo for me is different than someone else? I'm sure it is but I just want a little explaining because I always want to know more about all things Honda.

 

you could probably make 250 with that turbo, but idk about 300.

it'd probably be best to get a bigger turbo

 

misinformation.

bigger turbos can produce more power but spool at a higher RPM.
smaller turbos can't produce as much power as big turbos, but spool earlier.

It all depends what you want.

I'd say for this application a medium sized turbo would probably be best.

 

Well there are many turbos that would fit your application the larger the turbo the less heat it will produce at higher levels of boost which would be requisite for 300whp and more. A built block without sleeves can hold all the way up to 400whp without issue but you generally need to get the block bored to get the crosshatching back on the block. I would say a t3/t4 50 or 57 trim and .55 A/r or so would get your goal and surpass it if need be. The other important factors to consider are tuning and injectors when going that high so make sure that you have those covered as well. I think the t25 would be a bit too small depending on the compression of your engine to even make 250whp because it would just be blowing a bunch of hot non dense air to flow what is needed for that much hp effectively, I am sure much more has been seen out of that turbo just that it may not be the most thermodynamically efficient way. The manifold will be different for a t3 as well. Good luck with the build

 

i would recommend a Mitsubishi big 16g, will support over 300hp and spool will be quick still and there not that pricey. not sure if if its just a straight bolt on or not but they are a bolt on upgrade for dsm's

 

+1! [Insert generic ignorant postwhore comment here]

to the OP, I say a .57 trim t3/t4. It can support plenty of power, but thanks to the t3 exhaust side, it spools up as fast as a smaller turbo would.

 

even a gt28rs will work. Theyre good for 325ish or a lil more i think (360) theyre the turbos that come in the edelbrock kit

 

14b can make some power.....16g is a step up and could make the power easier but the 14b would spool quicker. I've got the a td05h-14b and it does the trick and apparently they're decent sized enough to still make quite a bit of power if you up the boost.

 

I think the disco potato is good for ~350hp.

 

Cool, thanks everyone for all the different ideas. I think the 16g or a t3/t4 might be the way I go. I have an hf mani with an adapter for my mitsu t25 but my tuner welded the adapter to the turbo housing instead of the exhaust mani so I can't do the mitsu upgrade without a different mani, so that may be the reason (excuse) to change over completely to a t3/t4.