How much horsepower can you get out of a stock 850 Turbo engine. With all the upgrades you could possibly have while not blowing the engine.

 

That depends on what you plan to do to the motor. On a stock motor, with stock pistons, rods, crank, etc, you're pushing it with anything much past 320 or so. past that, you can definitely begin to run into longevity problems.

Like pretty much anything out there though, with a limitless budget, your possibilities also become limitless. You could build a cavailer motor to 1000 hp if you had an unlimited budget. I wouldnt rely it it lasting, though.

Hope that helps and that it was what you were asking.

 

Think about your transmission going before your engine going... Your transmission wont be able to take much beating on at higher power numbers.

Your engine is good till about 300-320, 320 being the max you'd want to do on a stock engine and even that I would not want to do really.

Also realize your turbo wont be able to handle much PSI either. 15PSI max.

 

http://volvospeed.com/vs_forum/index...-dont-comment/

 

Well said, S70. A couple things my dad taught me early on in my life:

1) There's fast, there's reliable, and there's inexpensive. You can have two of the three.

2) you can build ANY motor to as much power as you want it to have, it's just a question of how much money you are gonna spend doing it.

I've seen 500+ horsepower civics - not saying it's ever something I would do, because (and we have a civic) to me, a civic is an "A to B" car, and nothing more. If I am gonna build a car to be ridiculously fast, I'm gonna start with a better platform. Some cars are just more buildable than others. They can ALL be built - it's just a matter of money vs gains.

 

One layer to that question...how much HP can be had with the stock turbo? This is of course you have the supporting mods like intake, and exhaust, and a way to tune.

How much can the stock fuel injectors take before they go static?

 

I had a 15G maxed out at 15psi with stock exhaust, thats about the limit of pressure it can produce with that setup. When I went to an 18T and full exhause to support it I was able to increase the boost and now mine pulls like a freight train. HP output? Who knows but I have not reached the limit of the engine, she runs fantastic. I am running just about every mod you can add externally.

 

what if an exhaust (minimum 2.5" all the way back) was added as well as a CAI, is 15 psi still the max? Or do we start running into Fuel injectors maxing out and ECU not being able to keep up?

I would imagine the ECU without a tune would be a problem. Maybe I need to go read the sticky thread again and get my answers.

 

You need to get that thing on a Dyno so we can see the HP results. Do you have any video of you car...on the street or at the track? Wish you were closer...Bob Kugan (Mustang racer) moving his shop just down the road from me and is having a Dyno Day open house in Nov. You can get like 3 pulls with Boost, A/F readings, HP, and Torque numbers for $50.

 

its not so much the fuel injectors or exhaust backpressure, its about how a turbo operates. The volume of air it can compress is not limitless. For those of you who are not super familiar with what a turbo actually does, or how it works, or why they get so hot, etc...

http://www.turbobygarrett.com/turbob...o_tech101.html

This explains a LOT of basics. if you go to "turbo tech 102" it gets a little more complex. Move onto the section called "turbo tech 3" and you start learning about things like pressure ratio, mass flow rate, surge line, efficiency islands, etc.

I'd encourage EVERYONE who wants to get into upping their boost pressure to read all three of these. Even if you dont understand a lot of it, it's worth making the effort. it will help you in the long run when it comes to setting up tour turbo to get the maximum amount of boost and power from it. I learned a LOT reading these.

 

I very familiar with the turbo's and what they do. (I'll still go check out the link though). I was just curious about the efficiency range of the stock turbo. You can bump the efficiency range a little by increasing the flow characteristics on the intake side and exhaust. I guess from what i read the intercooler is pretty good and the air box already flows pretty good. So maybe it is maxed from the factory. Sometimes the factory leaves some on the table to go after...especially on the older cars.

My Mazdspeed6 had a tiny K04 turbo (spooled fast) and was pushing 15.5psi from the factory. It was maxed at about 17psi and no matter what you did from the exhaust and intake side it would just not physically push any more air. The ECU and supporting hardware was pretty maxed as well. Very sensitive to changes.

 

I am running an IPD Stage 1 ECU. I had a nice long talk with Lucky from IPD about moving to a Stage 3. After installing the Wideband I was able to see my AFR reading. The Stage1 is running perfect and I am running OEM oranges. Lucky said even though IPD would love to have my $ there would be no advantage to getting a Stage 3. So to answer the injector question, up to 18psi on an 18T is fine. But, not sure how a OEM ECU would do and you will run into fuel cut off at 15 anyway. That was my main reason for going IPD to get rid of that cut off...drove me crazy. But it also remaps the fuel which you need.

 

http://www.youtube.com/watch?v=rfKXjIlS17M

 

Man that thing pulls like a truck. The torque is right where you need it.

Do you have to change the ecu to boots up to 15 with the stock set-up? I was told that my R left the factory at something like 10.6 while the T5's left with 9.6.

 

I ran the stock ECU with a manual boost controller for a bit. Still hit fuel cut off once in awhile.

You have the ecu specs right but you can force more boost with adjusting your wastegate rod a bit or a manual boost controller.

 

All I was thinking was Brakes, Brakes, BRAKES!! That thing really moves out and it's a Wagon, love it!! Sounds super sweet too; I want mine to do that when I get one! My seach continues

Like to see what it would do at the track in good weather with good traction (can we say drag radials)

 

I see you have some water/methanol type injection. Are you currently running it (was it working on that short video?). How do you have it rigged up...through a WOT switch or boost/Vac. activated?

Need more video's!!!