I'm on a budget, as 90% of us are, so TPI isn't the smartest way to make horse power

BUT I LOVE IT.....
so i want to know about my future with TPI. Whats the MAX rpm someone has gotten from TPI? 6k? 6500? Also.. It makes torque, but does it make horse power? At say 5000 without a miniram is it possible to get higher torque numbers than horse power?

For $200 carb, $200 intake manifold you're done with a carburated engine, but for TPI their are so many more parts with much bigger prices... So to build a street warrior, do i go for the torque, or go for the horse power? What should I do????

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1985 IROC-Z, nuff said :P

 

Well, your first consideration is if yu have to pass a visual test for smog.

Second is if you need to pass a fuctional test for smog.

Last is if there's no smog test, and HP is what you seek on a tight budget, most likely the best choice is a good cam, some headwork, carb and good exhaust...as you mentioned, much cheaper to make higher end HP with a carb than it is with a TPI setup.

 

What Mike said.

 

Unfortunately I didnt make it that far (rocker arm problems) but yea, I think that part is entirely possible.

 

Swwwwwwweeeeeeeeeeeeet


And as far as smog goes we have no emissions where I live. I like tpi because of fuel milage and reliability (sometimes)

I'd love to stay with it, but GOD its some spendy ****.
Whats the most cost effective way to make alot of power with the intake manifold up, without siamesing the stock manifold????

 

No!

Horsepower is a calculated value based on torque and rpm:

HP = (torque x rpm)/5252

therefore below 5252 rpm, torque will always have a greater value than horsepower.

If you're building a street-warrior, build for mid-range torque. If you're torque peaks at 5000 rpm, you've built a race-only motor that will be a genuine PITA on the street!

 

Well how can i beef up my midrange torque (ie under 4,500) without shifting my power range? Bigger headers = upper rpm
bigger valves = upper rpm

Every "performance" mod seems to try to move upwards in the power band

How do i make some SERIOUS power for a SERIOUS street machine that will probably never see over 50-60 mph in a street race (we have short lights in this town) But is capable of hitting the quarter and pulling some nice times.

 

Max RPM is a bunch of crap. You can rev a TPI to rediculous RPMs but that doesn't mean that it is creating good POWER at those RPMs. Mike Davis did a great test between a FULLY upgrade and ported LTR setup as compared to a stock MiniRam. ZZ4 motor with HOT cam.
<table BORDER=1 COLS=3 WIDTH="75%" >
<tr>
<td>
<center>RPM</center>
</td>

<td>
<center>TPI / MiniRam (Torque)</center>
</td>

<td>
<center>TPI / MiniRam (HP)</center>
</td>
</tr>

<tr>
<td>
<center>3600</center>
</td>

<td>
<center>340* / 295 <font color="#FF0000">-45</font></center>
</td>

<td>
<center>230 / 201 <font color="#CC0000">-29</font></center>
</td>
</tr>

<tr>
<td>
<center>3800</center>
</td>

<td>
<center>335 / 296 <font color="#FF0000">-39</font></center>
</td>

<td>
<center>242 / 213 <font color="#CC0000">-29</font></center>
</td>
</tr>

<tr>
<td>
<center>4000</center>
</td>

<td>
<center>333 / 299 <font color="#FF0000">-34</font></center>
</td>

<td>
<center>253 / 228 <font color="#CC0000">-25</font></center>
</td>
</tr>

<tr>
<td>
<center>4200</center>
</td>

<td>
<center>328 / 302 <font color="#FF0000">-26</font></center>
</td>

<td>
<center>260 / 240 <font color="#CC0000">-20</font></center>
</td>
</tr>

<tr>
<td>
<center>4400</center>
</td>

<td>
<center>319 / 302* <font color="#FF0000">-17</font></center>
</td>

<td>
<center>268 / 253 <font color="#CC0000">-15</font></center>
</td>
</tr>

<tr>
<td>
<center>4600</center>
</td>

<td>
<center>310 / 302 <font color="#FF0000">- 8</font></center>
</td>

<td>
<center>271 / 263 <font color="#CC0000">- 8</font></center>
</td>
</tr>

<tr>
<td>
<center>4800</center>
</td>

<td>
<center>299 / 300 + 1</center>
</td>

<td>
<center>272* / 273 + 1</center>
</td>
</tr>

<tr>
<td>
<center>5000</center>
</td>

<td>
<center>284 / 298 <font color="#009900">+14</font></center>
</td>

<td>
<center>271 / 282 <font color="#009900">+11</font></center>
</td>
</tr>

<tr>
<td>
<center>5200</center>
</td>

<td>
<center>270 / 290 <font color="#009900">+20</font></center>
</td>

<td>
<center>270 / 286 <font color="#009900">+16</font></center>
</td>
</tr>

<tr>
<td>
<center>5400</center>
</td>

<td>
<center>259 / 284 <font color="#009900">+25</font></center>
</td>

<td>
<center>268 / 295 <font color="#009900">+27</font></center>
</td>
</tr>

<tr>
<td>
<center>5600</center>
</td>

<td>
<center>247 / 278 <font color="#009900">+31</font></center>
</td>

<td>
<center>264 / 297 <font color="#009900">+33</font></center>
</td>
</tr>

<tr>
<td>
<center>5800</center>
</td>

<td>
<center>234 / 272 <font color="#009900">+38</font></center>
</td>

<td>
<center>259 / 300 <font color="#009900">+41</font></center>
</td>
</tr>

<tr>
<td>
<center>6000</center>
</td>

<td>
<center>227 / 263 <font color="#009900">+36</font></center>
</td>

<td>
<center>259 / 300 <font color="#009900">+41</font></center>
</td>
</tr>

<tr>
<td>
<center>6200</center>
</td>

<td>
<center>216 / 256 <font color="#009900">+40</font></center>
</td>

<td>
<center>256 / 303* <font color="#009900">+47</font></center>
</td>
</tr>

<tr>
<td>
<center>6300</center>
</td>

<td>
<center>211 / 250 <font color="#009900">+39</font></center>
</td>

<td>
<center>254 / 302 <font color="#009900">+48</font></center>
</td>
</tr>

<tr>
<td>
<div align=right>(*)=Max. AVG.</div>
</td>

<td>
<div align=right>280.8 / 285.8 <font color="#009900">+5 </font></div>
</td>

<td>
<div align=right>259.8 / 269.1 <font color="#009900">+9.3 </font></div>
</td>
</tr>
</table>

Tim

------------------
TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's with bigger cam, bigger stall, and bigger exhaust.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

[This message has been edited by TRAXION (edited July 13, 2001).]