DSM T25 on a 2.2L S10
 

I am in the process of picking up parts to install a DSM T25 on my '00 S10 2.2L. I have the turbo, 1st gen DSM BOV, all flanges needed for the header and exhaust, oil drain flange, etc etc.

So I have answered most of my questions through endless searching all over the web including here. I am set with how to feed and drain oil for the turbo, coolant is handled. Fuel for the motor is handled with a new pump and injectors. But, a few that I have yet to find an answer to I hope you guys may lend some guidance?

What would be a good size for the cold side piping? Outlet of the compressor of the turbo is 1 11/16". Would 2.25" be too big and loose boost pressure?

What would be a good size exhaust to run off of it, the turbine side? Outlet of the turbine side is 2 1/8". Would a single 3" be too big?

Plan for the header is 1.5" primaries into a 2.25" collector. I plan to make this flanged before the main turbine flange so later down the road a swap to a different turbo would just be a matter of making a new adapter from header collector to turbine inlet. Same for the outlet with a flanged dump pipe.

cold side depend on how much u plan to push. 5 to 8 psi meh 3 inch is to much. stick to 2 to 2.25 on the cold side for stock motors.

down pipes can help in many ways. a smaller one will help on boost drop between shifts or keep it in boost better. but on a t25 you have no prob with spool so the bigger the better. course this is my opinion. good luck and post pics.

ive built a 98 s10 2.2 turbo so ask me anything.

2.5" charge piping is the norm.
you will need silicon reducers to adapt the 2.5 charge pipes to the turbo compressor and throttle body. go to silicon intakes. com to order them. there the cheapest around.

go with 2.5" exhaust. any more is a waste of money unless your goal is big hp numbers.

1.5 primaries is a must since the exhaust header flange requires 1.5" primaries
as far as the collector outlet purchase one that has a cone shape or reducing collector so you can cut off the collector outlet to the size you need.

5G_4G15...

Plan for now is 8 max since the motor has 246K. After a rebuild with a ported head and some studs I want to see what the max boost of 15 or so with this T25 can get me....

busa4...

I knew you would chime in! And glad you did. I was looking into 2.25" pipes. I want it all low rpm boost as this is my commuter. Need that low end to get moving.

Plan it to use a Flowmaster type reducer as they are smooth flowing.

2.25 - 2.5" pipe will be fine. this small difference wont be noticable. 2.5" is the most common size so there are many parts available when using 2.5" exhaust and boost piping. what controls lag is the size of the exhaust housing.
i used a t3/t4 hybrid turbo on my build and it spooled up at 2500 rpm. your t25 will spool quicker.

Excellent info guys, thank you.

So cold side I will set up with 2.5" piping and intercooler.

Hot side I want to run the 1.5" primaries like already stated (and the flange requires it anyway), into a 3" collector. Then from the main collector I will make an adapter from the 3" and reduce it down to the 2.25" for the T25 flange. I can them make any collector "adapter" if ever I want to change to a different turbo.

Outlet I will set up with 2.5" and a nice flowing muffler.

If it spools anywhere under 3000 I will be very happy. The truck lives at 2700 on the commute so it should make for a fun little truck.

What do you guys think about this intercooler?

Now as far as it would be installed on my truck the most psi it would ever see is 15 with the T25 and probably 250-260 crank hp. I have a template of the size cut out and plan to yank the grille in the next few days and see if it will even fit. I want to keep all charge pipes on the driver side of the engine bay to keep them as short as possible and I think it will make for a cleaner install. Routing it to eh passenger side and then into the TB makes for a few sharp bends that I am not happy about.

UNIVERSAL 16.5"x11"x2.5" TOP MOUNT/EXIT JDM INTERCOOLER - eBay (item 140450674975 end time Feb-04-11 19:30:56 PST)

16.5'' x 11'' x 2.75" High Flow Intercooler

Square High Flow Tube & Fin Design

All TIG Welded 6061 Aluminum.

PSi Drop under 0.2. Other Intercooler usually drop 2 Psi Some are More.

Inlet/Outlets are offset on both sides of the intercooler

Core Size: 11" x 11" x2.75 with 2.5" inlet/outlets

Max PSI is 40 Up to 600HP

its going to be very difficult to route the inlet and outlet on the same side. most intercooler installs ive seen on these trucks required a good amount of cutting to the radiator support to sneak the pipe behind the headlights. as far as too many bends dont worry about it. the mandrel bent tubing will be more than adequate to allow the air to flow smoothly even on the tightest of bends. unfortunitely there is no other way around it. you are going to have tight bends. my car has nine 90 degree bends and two 45 degree bends.

I have the same turbo on my Honda I am running 2.5" pipe with a DSM side mount. I was only runnin 10psi. I might not be thinkin correctly but I believe that turbo looses efficiency at like 14psi. After that its just blowin hot air.

Thanks for sharing. Wasn't really thinking of how the pipes will pass behind the headlights. Point taken! Still in the planning phase there so I will cover all options. May be best to get some 2.5" exhaust pipe and see how and where they will best fit and then decide what in/out intercooler setup will accommodate that the easiest.

I did find one build where the person used the dsm intercooler and mounted it behind the rad support (right behind the DS headlight) in the engine bay. This is what got me on track of the piping how I asked. Just figured the engine bay was not the best spot for it.

You are probably right. I have heard this, 10psi is about as good as it gets. I only said 15 as I have been told this would be a very max psi I could push with it so kinda mentioned it to see if the intercooler I linked would be ok at that pressure.