supra_su.gif (3788 bytes)

Blitz DSBC electronic boost controller installation

Purpose: allows the turbo boost to be set to a consistent level (actually, 4 preset levels) and eliminate boost spikes. Some cars can't run unlimited boost due to pre-ignition problems.
Tools/parts required: (4) 1/4" vacuum caps, scissors, flat-head screwdriver, coat hanger, duct tape, flash light
Time required: 2-3 hours
 
Control Unit Installation
Choose a place to mount the control unit. To mount the unit on top of the steering column like I did:
Run the long harness with the power/ground plug behind the dash between the gap in the dash just above the steering column. You'll have to lay on your back with you head near the gas pedal to do this. Shine a light from the front of the dash so you can locate where to route the wire. Pull the wire thru the gap, then, from the the front of the dash, plug into the DSBC control unit.
 
Extend the length of the 1/8" diameter hose coming out of the back of the control unit using the supplied connector and extra hose. Shove the hose and the two connectors into the gap so it looks tidy as in figure 1.
dsbc1.JPG (6749 bytes)dsbc2.JPG (10472 bytes)
fig. 1
 
Connect the hose coming out of the control unit into a boost source. I tapped into my boost gauge hose, behind the dash as shown in figure 2. Use the supplied hose clamps on the T as shown.
If you don't have a boost gauge, you can tap off the metal Y going to the turbo pressure sensor ('A' in this picture), but you'll have to run the hose thru the firewall into the engine compartment (see the boost gauge install page).

 
 
dsbc4.JPG (6599 bytes)
fig. 2

Connect the black ground wire. I connected it to a 10mm bolt that goes into the firewall near the clutch (fig 3).

dsbc7.JPG (6830 bytes)
fig. 3

Connect the red power wire. I connected it to a terminal spade and then plugged it into the unused "SEAT HTR" fuse position (the third one from the front, top, row of fuses) as in figure 4. Note, for my install only, that the wire shown is black with a white stripe (this is where my radar detector is wired to, I just tapped into this wire).

dsbc8.JPG (12270 bytes)
fig. 4
Solenoid Installation
Route the long wiring harness thru the firewall:
    a) punch a hole thru the yellow rubber grommet near clutch pedal with screwdriver (fig 5)
    b) duct tape the end of the harness to a coat hanger
    c) route wiring harness thru this hole into engine compartment, push as far and as high as possible
    d) from under the hood, pull the harness into the engine compartment (near the brake master cylinder, not shown)
dsbc3.JPG (8785 bytes)

fig. 5

Route the harness along the firewall, ending up near the passenger-side shock tower (not shown).
 
Disconnect and remove the two hoses from the black wastegate VSV (just above the alternator), then cap (1 & 2 in fig. 6). Click here for a picture of what the VSV looks like before the vacuum caps were added (ignore white bleeder T).
 
Disconnect and remove the hose from the bottom of the brass wastegate actuator, then cap (3 in fig. 6).

dsbc6.JPG (9446 bytes)

fig. 6

Disconnect the hose that runs from the left side of the wastegate VSV (1 in fig 6) up to the metal tube, then cap (1 in fig. 7).

dsbc5.JPG (11981 bytes)

fig. 7

Disconnect the hose from the top of the wastegate actuator (not shown, but the actuator is shown in fig. 6). The other end of this hose goes to the #1 turbo pressure outlet - remove this hose.
 
Mount the solenoid near the passenger-side shock tower with tie-wraps (fig. 7).
 
Connect one of the supplied 1/4" diameter hoses from the turbo pressure outlet on the #1 turbo to the IN side of the solenoid valve unit (not shown).

Connect the other supplied 1/4" hose from the OUT side of the solenoid valve unit to the top of the wastegate actuator (not shown).
 
Note: cut the two hoses that connect to the solenoid unit to the shortest length possible. The DSBC manual states that boost spikes can occur if these hoses are more than 3 feet long.
 
Obviously, make sure all wires and hoses are free from moving engine parts and not in direct contact with anything hot.
 

Tuning

Set the gain to 5 by turning the MODE knob until 1234M is displayed. Hold the MODE knob until 1234M blinks, then dial the VOLUME knob to 5. Press the MODE knob to lock in the setting. The higher the gain is set to, the greater chance of overboosting you'll have. The lower the gain, the slower the boost will rise, but you'll have less of a chance of overboosting. Increase the gain at your own risk!

Note that I inadvertently set the gain to 60 one time and this caused pre-ignition (detonation) in my car because the boost was coming on too quickly.
 
You have four preset boost levels you can program (plus stock boost level when the unit is set to OFF).
To program each boost level, turn the MODE knob until the desired boost preset (1 to 4) is displayed. Hold the MODE knob until the preset (1-4) blinks. Rotate the VOLUME knob to the desired boost level (0-100). Note that this represents a ratio (0=stock boost, 100=maximum boost possible). Here is how I configured the presets:

preset

volume

 approx. psi*

off

 0 12
1 54 15
2 58 16
3 63 17
4 75 19

*The unit displays boost in kg/square cm, not in psi; boost level depends on mods and the weather, my car is BPU. The car will make more boost in higher gears.

Pressing the VOLUME knob changes between current boost setting, boost gauge, and peak hold (press MODE to reset peak hold).

I recommend you set the boost limiter to prevent running too much boost:

bullet Turn the MODE knob until you the display turns red and the WARN icon is blinking.
bulletTurn the VOLUME knob to set the desired limit level. I set mine to allow max boost of 1.20kg/square cm (17 psi). When the boost limit is reached, the unit will beep and boost will be reduced according to the next setting:
bulletPush the VOLUME knob to display the amount (in percentage) to reduce the boost when the limit is reached. Note: pushing the VOLUME knob toggles the display between the limit level and the reduction amount.
bulletTurn the VOLUME knob to set the desired amount (0 means limiter the limiter is disabled). For example, mine is set to -6 which means the current boost setting will be reduced by 6 percent when the boost limit is reached. The original boost setting will resume if the current boost reading falls below the limit amount.

The unit also has a "scramble boost" feature that lets you run a certain boost level for a specific amount of time. I did not enable this this, as I found no use for it.

Need the original instructions in English? Call Blitz USA at 714-777-9766.
Check out this very nice description of the DSBC (with tuning help) at:
http://www.geocities.com/MotorCity/Speedway/9589/dsbc_manual.html

 

horizontal rule

Home | Photos | email me

only search randydellinger.com

last updated: Tuesday, May 20, 2008 05:53 PM