Archives for : October2010

Track Duty Z31

The Deal Family’s Track Warrior Z31 Turbo

A few weeks back we got a call about Z31 needing some dyno time.  Owner’s Todd and Tyler Deal were battling misfiring and poor running performance out at the track.  This Z has an impressive list of parts one is a wickedly built SOHC VG30 that makes use of a VG30DETT crankshaft.  The car and its parts don’t look impressive but this car does surprise once it finally was fixed.  I don’t have all the details on the car but it obviously has a healthy sized T3 framed turbocharger, JWT Cams, 2.5″ I\C Piping,Greddy Recirc Valve, Tial W\G, Greddy Profec B B.C., and AEM Water\Meth Injection.  The water injection does an excellent job in keeping engine coolant temps down believe it or not.  This Z also makes use of a transmission cooler & pump to combat unwanted heat in the gear box.  This 1984 Z depends on the use of JWT’s ECU conversion that uses an 88-89′ NA ECU, Ford Cobra MAF, and Bosch 420cc Injectors for engine control.

Resting after a hard day’s work.  The I\C can easily be seen along with beat up brake ducting.

After a few attempts to make a clean pass on our dyno due to tremendous misfiring, we took over tuning and fixing any mechanical\electrical issues.  A shout out to Clark Steppler from JWT for fixing the ECU quickly.

The blue run was the way it came in.  Really bad misfiring, so much a complete run could not be made.  After some time of tuning you can see where ended up on the red run.  See how torque happy these SOHC engines are.  401 whp & 429 Torque.


Juan from Bardabe brought over his customer’s car for us to tune.  This time we got to play with a red top SR with a 2876R Garrett turbo.  This 240SX comes with an S15 front end conversion and is gutted for drifting fitted with a cage to boot.

Here are some other important mods:

  • Z32 MAF
  • Sard 850cc Injectors
  • HKS 272 Cams
  • Brain Crower Springs & Retainers
  • Cosworth Headgasket
  • 87mm Bore & 9:1 Compression (CP Pistons & Eagle Rods)
  • HKS W\G Actuator 10 psi Base
  • Blitz Intercooler
  • Unknown Exhaust Manifold
  • Greddy Intake Manifold
  • Greddy Recirc Valve
  • Blitz SBC iD Spec-R B.C.

We used the factory ECU with a Nistune board to get this little 4 to run properly.  After many hours of getting the base map & cold\hot start setup we were ready to make power and turn the rollers.  We setup the HKS W\G actuator to 10 psi base and later installed a Blitz SBC-iD Spec-R Boost Controller to make more ………BOOST!

91 Octane Tune, 15 psi for 353 whp & 292 Torque

Q16 Tune, 23 psi 444 whp & 355 Torque.  You’ll notice that at 6600 RPMs the clutch (Exedy) starts to slip thus the power drops and boost drops.  It can still make more power!

Melissa Drifts & Godspeed Turbos

We’ve known Miss Melissa for a few years now and she’s been a die hard drifter ever since she had the opportunity to try it herself.  There’s a good chance you’ll see her if you frequent the drift circuits like Irwindale in SoCal.  Her poor car has seen alot of abuse but it just keeps going.  She sent me a text one day out of the blue if we would install a pair of turbos on her car.  I kept an open mind and knew something like this undertaking was opening a can of worms.  Its not as simple as one may think, throw some turbos on and your done.  Doesn’t really work that way most of the time.  Melissa’s Z32 is pretty stockish in the performance department.  It packs a JWT Single POP, Boost Jets, JWT ECU, Stock Fuel Injectors, Genie Catback, SZ Clutch & Flywheel.  That’s it for mods.  So when she asked about upgrading turbos we scratched our heads.  There was plenty more to do before she truly maxed the stock turbos potential.  For those who missed it, this is the pride and joy (click me).

Godspeed hooked her up with a pair of their new turbos and intercoolers.  Our opportunity to see what cheap Chinese made turbos look & perform.  Chinese parts\copies have taken over our market by storm.  Its amazing that the consumer will buy the cheapest option, thinking only with their pocketbooks.  Anyways that’s enough of ranting, I can go on and on and on and on and on……..

To simplify things and minimize the can of worms we opted to install the turbos with the engine in the chassis.

Specs direct from Godspeed:

Compressor Trim 60 Exhaust Trim 63
Intake side inducer 46.48
Intake side exducer 60
Exhaust side inducer 53
Exhaust side exducer 47.12
Internal wastegate set at : 12 psi

We found that the wastegates were totally off.  One opened at 5 psi the other at 9 psi.  We set them for 13-ish psi.  Keeping in mind Melissa has no boost controller.

Dual port actuator is included.

It’s “hot” side.  4-Bolt housing.  Much larger housing than stock though.  Turbine wheel is a good size.

The “cold” side.  You’ll notice that the inlets and outlets are cast made to fit the Z32 configuration.

Turbo Manufacturer (JiaMu).  A quick Google search brings up some diesel truckers experiences with them.  Let’s hope they last for Melissa’s sake.

Stock cold side on the left, Godspeed on the right.

Stock hot side on the left, Godspeed on the right.

Melissa’s Z32, checkout her site when you have the opportunity @

The results:

This isn’t a straight apples to apples comparison as you can see the boost levels were different along with supporting mods.  11 psi on the stock turbos, 13-14 psi on the Godspeed.  The Godspeed turbos also received a help from their intercoolers along with some down pipes & test pipes.  So I wouldn’t go off this graph.  This is just to show the difference on how the car ended up.  287 whp on stock turbos, stock pre-cats & cat pipes, and stock intercoolers.  341 whp on Godspeed turbos, intercoolers, down pipes, test pipes, and higher boost.  Just so we’re clear on differences.  No tuning was performed and the factory injectors are still performing fueling duties.  This power level is easily attainable on stock turbos as most already know.

We wish you the best in luck with your drifting quest Melissa, and let us know how the turbos hold up.  At least now she’ll be able to smoke the tires more effortlessly through the drift.  Rock on.