This test compares the Holley StealthRam (HSR) fuel injection intake, with
an Edelbrock aftermarket TPI intake that was siamesed down to 3inch port
runners (siamTPI). The engine was basically the same, consisting of a ZZ4
crate motor, AFR190 heads, LT4 HOT cam, and SLP 1-3/4" SS headers. Trans
is a 700r4 with a Vigilante 2800 stall converter. The Engine Control
Module (ECM) was a '92 TPI stock ECM (MAP/speed-density) with a modified EPROM.
All Dyno Numbers are referenced at SAE correction
| siamTPI | HSR | siamTPI |
HSR |
||||
| RPM | Torque | Torque | Diff. | HP | HP |
Diff.
|
|
|
3400
|
355
|
334
|
-21
|
|
230
|
216
|
-14
|
|
3600
|
375
|
346
|
-29
|
|
265
|
237
|
-28
|
|
3800
|
379
|
351
|
-28
|
|
275
|
254
|
-21
|
|
4000
|
372
|
352
|
-20
|
|
288
|
268
|
-20
|
|
4200
|
365
|
350
|
-15
|
|
294
|
280
|
-14
|
|
4400
|
355
|
345
|
-10
|
|
295
|
290
|
-5
|
|
4600
|
335
|
339
|
4
|
|
294
|
297
|
3
|
|
4800
|
322
|
331
|
9
|
|
294
|
303
|
9
|
|
5000
|
311
|
322
|
11
|
|
294
|
307
|
13
|
|
5200
|
299
|
316
|
17
|
|
296
|
313
|
17
|
|
5400
|
288
|
310
|
22
|
|
296
|
319
|
23
|
|
5600
|
278
|
304
|
26
|
|
296
|
324
|
28
|
|
5800
|
268
|
299
|
31
|
|
296
|
330
|
34
|
|
6000
|
259
|
292
|
33
|
|
296
|
335
|
39
|
|
6200
|
250
|
287
|
37
|
|
296
|
339
|
43
|
|
6400
|
232
|
280
|
48
|
|
284
|
342
|
58
|
|
6600
|
218
|
270
|
52
|
|
274
|
340
|
66
|
|
AVG
|
309
|
319
|
10
|
|
286
|
300
|
14 |
| Vig | Diff. over TPI | HSR | ||||
| Temp |
~58
|
54 |
||||
| Humidity | 94% |
|||||
| Baro | 32.25 |
|||||
| R/T | 0.532 | 0.465 |
||||
| 60' | 1.652 | 0.006 |
1.646 |
|||
| 330' | 4.901 | 0.078 |
4.823 |
|||
| 1/8 | 7.697 | 0.181 |
7.516 |
|||
| Mph | 87.74 | 3.07 |
90.81 |
|||
| 1000' | 10.125 | 0.268 |
9.857 |
|||
| 1/4 | 12.183 | 0.350 |
11.833 |
|||
| Mph | 109.59 | 4.71 |
114.30 |
28lb-hr LS1 injector duty cycles
