Young Version — August 1999
An archive project by Flock MFGNew issue alerts →
About this issue
The August 1999 issue of Young Version explores drift setups versus grip tuning through 22 shop demo cars, including S15 Silvias from Mine’s and Kazama Auto. Features cover front-wheel-drive builds taking on high-powered 4WD rivals, choosing a first drift car, and reviving a used AE86 Trueno on a ¥1 million total budget. Suspension fundamentals, engine-oil selection, rotary maintenance, new-parts tests, and reports from Hiroshima and California round out this look at Japan’s late-1990s tuning scene.
242 available scans from Young Version — August 1999, in right-to-left reading order. Japanese OCR and English translation drafts are available throughout. Drafts have not received exhaustive image proofreading; unreadable source remains recorded in the archival data.
Page 71 — English draft translation
The boost holds up better at high rpm. Although it drops slightly from the 1.2 kg/cm² peak, it stays firmly above 1.0 kg/cm² to the end. Driving impressions: perhaps thanks to the ball bearings, low- and midrange response is excellent and punchy. It doesn’t seem to pull especially hard at high rpm, but that may be because so much more power is available down low. The S15 boost-up setup also doesn’t feel especially fast from behind the wheel, yet the actual speed climbs dramatically. This feels very similar!
With the S15 turbo setup, power jumped by more than 50 PS! The Z32 airflow meter was also fitted at the same time, reducing intake restriction, but even so, that is a remarkable difference. One likely factor is that Taniguchi’s cams had been changed. The leading theory is that the S15 turbo works perfectly with the cam profile, unlocking performance that the old turbo couldn’t use. Okamura says that with stock cams, it would probably make only around 330 PS.
Captions and page details
The S15 turbo spools smoothly without a step in power—that’s one of its strengths.
Yasio’s Okamura
The Ultimate S15 Light-Tuning Build Diary: Special Feature
For the S13
180SX
YOUNGVERSION
“It’s a later-model S13, but it feels better sorted than an S13 with an S14 turbo. Changing the exhaust manifold should let it make even more power!”
The low-rpm pickup is so strong that you might think it has no high-rpm power!
Measured horsepower [PS]
Power loss [PS]
3.00
g/cm
42.1kgm
310.4PS
271.5PS
MAX->
FILE:RPS13002.DAT
ps
kgm
600
Stock + 44 PS
From the graph, the biggest difference from the stock S13 turbo is clearly at high…
Corrected torque [kg·m]
Air-fuel ratio
Corrected horsepower [PS]
Intake pressure / exhaust pressure [kg/cm²]
2.88
kg/cm
60
400
20.0
310.4
RPM
1:88
30
200
17.5
8.00
15.0
ps!!
=1:88
-200
12.5
259 Kmh
194
130
65
10.0
Chassis-dyno check at the same boost pressure as before the swap
For the S14
Even at the same boost, the car’s speed keeps climbing noticeably faster! —Owner Taniguchi
YOUNGVERSION
“It doesn’t feel like it gained 50 PS, but there’s definitely more power than before from about 3,500 to 7,000 rpm. The flat torque makes it very easy to drive!”
The cam match must be just right—those unbelievable numbers came out!
Measured horsepower [PS]
Corrected horsepower [PS]
Power loss [PS]
3.00
kg/cn
kg/cn
44.5kgm
352.3PS
222.306
YASHI141.DAT
FILE:
MAX->
PS
kgn
60
600
20.0
Stock + 52 PS
The S13 result makes sense, but what surprised the whole staff was the S14’s…
Air-fuel ratio
Intake pressure [kg/cm²]
Corrected torque [kg·m]
Exhaust pressure [kg/cm²]
2.00
352.3
1:88
0
200
15.0
88
0.00
0.00
12.5
ps!!
=1.00
239 Kmh
179
119
60
0
-200
10.0
1291-5 Nishibukuro, Yashio, Saitama Prefecture / 0489-97-3510
With reporting support from Yasio Factory; chassis-dyno support from Top Secret, 1285-6 Miyako, Chuo-ku, Chiba City, Chiba Prefecture.
043·232·5221
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