SONIC, TECH NOTE SERIES

TURBONETICS SUPER V TURBO UPGRADE / INTERCOOLER FLOW BENCH TEST

File Name- TNSSUPER.TXT

Sunday July 07/96

Topics
*Supra GTE/7M-GTE/ Dynojet runs, Turbonetics Super V Turbo upgrade
vers Stock CT-26
*Intercooler flow testing, HKS/Greddy/Stock Toyota MA-70/Stock JZA-80
TT


Hi Supras. I went back to the Dynojet on Thursday morning with my 1982
Supra GTE. I reinstalled my Turbonetics Super V turbocharger Tuesday
night. The last time I ran my car on the Dynojet I was running my stock
CT-26. This past Thursday I made 3 more passes with the only change to
the car since the last Dynojet runs being the Turbonetics Super V upgraded
CT-26 and the Calgary air temp 10 DEG F warmer than the first passes. At
15 psi at 4000 feet altitude with the Super V my car made 296.3 Hp and
347.4 Torque at the rear wheels. With the stock CT-26 my car made 262.2
Hp and 333.4 Torque at the rear wheels at similar boost pressures.

I will post the Dynojet printouts from Thursdays Dynojet runs at the
Supras FTP site in the Supra GTE directory. The Dynojet printout has the
stock CT-26 and the Super V upgraded CT-26 overlapped on the same
printout. I have labelled the curves for your convenience because the
original printout use colours to show you which curve is for what turbo.
Please note than there were no other changes to the car other than the
swap on the turbo, same Lexus/Lucas/Regs fuel system, exhaust & air
filter, Denso spark plugs, get the idea. If you want to find out what you are
doing on the Dyno you can only change one thing at a time!

Have a look at the printouts and notice how there is more Hp and Tq at the
very bottom of the curve due to the 15 DEG cut on the turbine wheel. This
only lasts for a little while before the stock CT-26 would start to make
up for the back pressure and produce more torque and horsepower than the
Super V until 3800 rpm. At 3800 rpm the Super V blasts past the stock
CT-26 all the way to redline. I still see a Hp Tq drop after 5600 rpm but
the Hp and Tq are still higher up the curve than the stock CT-26. Its time
to break down and buy an Intercooler upgrade, the stock one is fine with
the CT-26 but after that I think were flowed out, read on to see why.

It is easy to see why at first drive the Super V upgrade makes the big
MA-71 feel slower than it did with the stock CT-26. The bottom of the
curve is very soft until 3800 rpm. The interesting thing is that the boost
seems to come on at the same time its just that it does not hit the way
the stock one does. The Super V comes in smoothly, this is good or bad
depending on the car and gears you run. My car feels faster around town
with the stock turbo but when you have the room to let it rip all the way
this car is truly Frightening.

Last winter when I was building the ONE LAP JZA-80 I had some various
Intercoolers flow tested on the local CFM bench at Guyon Racing. This
bench is a very nice unit it gives a flow rate in CFM, as well it has good
software for correcting temperature and air density on the fly, it also
maintains a constant inlet pressure read in inchs of water.

This CFM reading will not tell us that much about the real world Hp any
car with this Intercooler will make, but it will compare the flow rates of
the coolers compared to one another. In short it is a good stick to measure
them with. You can compare the CFM flow rate number to Dynojet Hp
output of the cars that run the specific Intercoolers.

We are running a modified {cut down} HKS 3 row on the One Lap Supra, this
Intercooler as you will see below flows much better than the stock or the
Greddy offering for the Supra TT. Notice that the stock Toyota Supra TT
Intercooler flowed more air than the Greddy side mount unit. keep in mind
this tells us nothing about Intercooler efficiency. The efficiency could
also be tested but many test procedures would have to be written to make
sure the test worth the time. I believe it is easy to see how efficient any
given Intercooler would be based on the core design and air flow through
the cooler. HKS makes very good cores, I believe that there cores are one
of the best designs in the world. They are not the cheapest but
unfortunately all the best things in life cost money.


Flow Rate Examples: All tests done with Guyon Racing test procedures and
standards.

#1 Stock 93.5 Supra TT side mount Intercooler flows 251.0 CFM at, 20
inch's of H20 pressure
#2 Greddy TT side mount Intercooler kit flows 247.90 CFM at, 20 inch's
H20 pressure
#3 HKS 3 row 400mm x 265mm x 97mm flows 330.9 CFM at, 20 inch's H20
pressure
#4 Stock 1989 MA-71 Intercooler flows 169.0 CFM at, 20 inch's H20
pressure

Thanks for reading all my rambling guys. Send feedback to Subject RE:
Reg's Supra GTE Latest Dyno runs / Intercooler test data

Talk Later

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