TPIS Oval Intake and TB vs. Stock LS6 intake and TB on a 450 RWHP 346 CID Z06.

[tekhombre]

Let's clear the air a bit on the "Magical Intake".

We had the opportunity to test it on a customer's car that came in for some updates on an older H/C package on a 346 CID Z06 and prior to the mods we decided to dyno the car with the stock LS6 intake and TB, and then with the TPIS oval inlet intake and oval TB.

Here are the results.


Both runs were made on stabilized temperatures. In other words, when a dyno run is first made on a cold drive train with low oil temperatures vs. stabilized temperatures there is always a 5-10 rwhp difference. This is why without making any tuning changes to a vehicle on the dyno, by the third or fourth run it makes 2% -3% more power than the first run if timing, A/F and coolant temperatures are kept the same, subsequent runs repeat within 1-2 hp.

The difference between the two intakes and TB was 3 ft/lbs and 6.7 hp.SAE corrected. If you look closely at the dyno graph, the two runs are within 1-3 hp all the way up to 5,000 rpm, as the engine keeps accelerating past 5,000 there is grater air demand and the TPIS intake with it's larger TB begins to make more power than the stock LS6 intake and stock TB. The TPIS intake is made by machining off the snout from a stock LS6 intake and attaching a new oval opening that excepts an oval TB, so the runners are left intact (stock length, diameter and taper angle) and won't change the wave action. This is also consistent with what we found on Brent's car (Stage 3X test car).

Sooner or later some other shops/racers will have the opportunity to test the difference between the two intakes and TBs, it would be very interesting to compare notes.


Julio

[tekhombre]

Here are two runs showing the MAP (in.hg.) difference.

Stock LS6 intake and TB,--- Oval Intake and TB

RPM --+-- MAP -----+----- RPM --+-- MAP --
2976------29.8 -----------2976 -----29.8 ---
3508------29.8 -----------3490 -----29.8 ---
4046------29.5 -----------4046 -----29.5 ---
4604------29.2 -----------4601 -----29.5 ---
5226------29.2 -----------5193 -----29.2 ---
5806------28.9 -----------5781 -----29.2 ---
6354------28.9 -----------6358 -----29.2 ---
6851------28.6 -----------6862 -----28.9 ---

The sampling rate is slow with the 20 items I was logging at the time and the samples are not at the exact RPMs, but a trend can be seen.

Julio

[Cobra4B]

Seems like a huge waste of money. This isn't the FAST intake is it?

[Stry]

Crystal clear presentation. Thanks!

Stry

[tekhombre]

Originally posted by Cobra4B
Seems like a huge waste of money. This isn't the FAST intake is it?

Cobra4B, it's not the FAST intake. This TPIS Oval intake and TB, is fine for strokers (10-15 hp) or for the person that want's that extra 6 HP out of their H/C car and doesn't care at what cost.



Julio

[z62jag]

Julio, I realize that you probably haven't had an opportunity to benchmark the FAST intake but how do you feel the TPIS will perform relative to the FAST intake on a big bore stroker?