Going to turbo.....

[91PDXmocha]

I think our turbos are close to the same size , 60ar 63t .
How much psi do you run normally ? You said in your drag thread u where trapping 104 and was turning the boost up to 10 psi to try and get more mph . So you pretty sure this size turbo is not going to make much more power ?

I know Scott used the same turbo as me when he first started his remote set up and made over 300 whp ,might even of been 340+ whp . Maybe he will chime in here , he knows the remote system well .

edit - Scott made 358whp at 10 psi with the same turbo as me set up in remote style.

 

[yamahaSHO]

Trust me, the stock programming is making you run 14.6 afr's at 5psi.
.

The ECU only knows RPM, load and WOT. If one of the critera isn't met for the stock program, then it will run lean. I know the Stock ECU is targeting 11's, and the load should be met with boost, but I can't recall what RPM that happens at the moment.

 

[gmail]

please do me and yourself a favor look into megasquirt...

 

[SHO Dude]

Here's another thread of what we do for a turbo kit on these cars.

http://www.shoforum.com/showthread.php?t=106885

We put the turbo in the back and used a separate oiling system with a reservoir. put 365hp and 405ft-lbs of torque on the ground.

Got a kit left if anyone is interested. I'm also starting a new project for an ATX car.

 

[Toolman]

365/405 at the wheels? Great numbers, how much boost?

 

[yamahaSHO]

Was that corrected or uncorrected?

I don't remember Scott's #'s, but the dyno was unable to load the engine and he had a hard time building boost.

 

[SHO Dude]

Corrected for barometric pressure only, but tq and hp on the tires thru a Dynojet dyno.

That was also 18psi on a built motor.

A stock engine sould be able to take 9psi and survive.

 

[Cnp22]

Do you sell a kit with just piping, and stuff like that minus turbo, fuel pump, maf?

 

[Sho Amo]

My turbo has the same a/r's as yours but my problem is the actual size. Its only like a 50 trim. So my turbo wont let the exhaust out fast enough. This is why I wont really be doing anything with it until I get my new turbo.

we ran almost the same trap speed and your car is a stock 3.0 with 5psi lol.

 

[Toolman]

Corrected for barometric pressure only, but tq and hp on the tires thru a Dynojet dyno.

That was also 18psi on a built motor.

A stock engine sould be able to take 9psi and survive.

Nice, I was unaware either of the 'stealth' turbo projects you built were worked over. Got any dyno sheets? Wondering what that curve looks like, 40ft lbs more tq than HP. I am assuming it makes gobs of TQ down low but the HP is fairly light after 6000rpm?

 

[Sho Amo]

Dyno numbers are stupid.



Lower set of numbers are done at 10psi. The high numbers are 18psi.

Im almost positive my car looks like the 8psi numbers.

 

[Toolman]

I wonder what a remote mount with a larger turbo would look like. While the numbers up high for these smaller turbo's look pretty pathetic, I can promise you that the meaty TQ in the middle of the powerband are a lot of fun. My lower HP small turbo car was actually a bit more 'fun' to drive most of the time, since the TQ was more accessible.

 

[SHO Dude]

The bigger the turbo, the more exhaust energy it needs to get going. So the peak ends up later in the curve.

Having the fat part of the torque curve in the middle is great. This car pulls in 5th gear like it's in 4th. 70mph on the highway at 2800rpm, just squeeze the throttle and here comes the power.

We're working on a twin turbo project to cure this little issue. Stay tuned.

 

[Sho Amo]

Yeah, but on the other end its fwd so having all that torque breaks the tires loose down low. Plus, this engine lives to rev, so its kinda lame to have your real power down low.

 

[SHO Dude]

Ya know, I thought the same thing until I drove the car.

Holly crap! At highway speeds, you don't need to downshift. Just squeeze the throttle and here comes the power. This thing accelerates in 5th like it's in 4th.

The other thing is that I think it's really a blessing to run out of steam at the top. I think it saves powertrain parts. So if you run it up to 6800rpm and pull the next gear, you lift to shift and dump all the boost off. Now you're hitting the next gear with 200ft-lbs of torque instead of something double that. Not like a supercharger where the hp curve is a straight line into the rev limiter.

I really didn't think that before I drove the car, but now I like the idea a lot more.

 

[Sho Amo]

Lol Doug, I feel the opposite. I think having so much torque down low would wear driveline parts out faster. My car is fun to drive on the street because the power is always right there. I just hate it on the track.

****, I was hitting 5psi through cruise control lol.

 

[yamahaSHO]

I think Doug is more worried about the 'powertrain' where high RPM really does wear motors quickly.

The one thing I remember about Scott's remote turbo is that the torque didn't spike hard and fast (probably due to all the piping), so he was really able to pull some decent launches without roasting the tires, but when he was ready to move, it did just that.

You can play with timing and fuel remove some of the spool during cruise, but given the gearing on these cars and the load they create, boosting in the higher gears with a turbo is going to happen. One thing I do like about the turbo in the STi is I don't have to downshift on the freeway to pass. The SC on the SHO has to be spinning pretty hard and requires me to downshift and get into the upper RPM taxing the engine harder than the lower RPM torque.

 

[Sho Amo]

Gotcha, what I meant by drivetrain is axles, diff, gears, etc.

 

[91PDXmocha]

Dang , 5 psi in cruise control haha

I was kinda worried my turbo was going to be to small but after driving even at 5 psi im confident its pretty nicely sized for a DD turbo/engine bay set-up, lots of usable torque . The .63 exh side with 2.5 UP seems to start to build at 2800 and pegs 5 psi by 3600-3700, wg struggling to keep up. full boost right as you hit the secondaries, then it really pins you in the seat in .

 

[yamahaSHO]

I don't even feel secondaries anymore. I bet with some tuning, you wouldn't either