LS2 Intake & TPIS 90 vs. TPIS Mod. Intake & Oval
 

Just something to chew on..still need to try it on other combinations obviously. This is a test done on a 98 C5 auto. Modifications are Blackwing, TPIS headers, TPIS Muffler system, 1.85 Rockers, and heads milled .010, and programming. Stock cam & no porting.


LS2 Intake & TPIS 90 MM TB

-393 RWHP @ 6200
-373 RWTQ @5100

-257-354 RWTQ 2900-3900 RPM
-356-371 RWTQ 4000-5000 RPM
-373-338 RWTQ 5100-6100 RPM


TPIS LS6 Intake & TPIS Oval TB

-402 RWHP @ 6000 RPM
-393 RWTQ @ 4800 RPM

-330-369 RWTQ 2900-3900 RPM
-375-387 RWTQ 4000-5000 RPM
-387-343 RWTQ 5100-6100 RPM


Both combinations were programmed for best power etc....

As you can see the LS2 Intake doesn't offer any power gains on this engine combination over the TPIS LS6 Intake and Oval Throttle Body (less throttle area). You'll notice there are some fairly large diffences in torque everywhere. I would assume most people are wanting to try this intake on the larger engines and we are too. Just some preliminary info until we get more cominations in the works. For the F-Body guys, our 90 MM TB could be run with the LS2 intake if it proves to be a worthwhile investment.


Jim Hall
TPIS
952-448-6021

:eek2: Thats some pretty stout numbers for a stock h/c bolt on A4.

PM sent....:)

good info. but did you dyno with stock LS6 intake and normal ported t-body?
can you list the prices for all those parts you mentioned?
seems like the TPIS LS6 Intake & TPIS Oval TB would be great for any H/C car; do you have any dyno's of that combo versus stock t-body/intake (LS6)?

Well thank you for the info. But i hope no one read this and thinks "LS2 isnt as good as a TPIS Ls6 because this dyno test says so"


First time I see a 346" heads/cam 450+ rwhp car swapped to an ls2 dyno results, ill pay alot of attention to those results, or a big cube setup.

Kinda like taking a stock motor and putting a tunnel ram intake with dual 4's on it..it just doesnt work..

Its just information.......thought some people might want to see it.




Jim Hall
TPIS
952-448-6021

Thanks for the info! I too would like to see the difference on an Agressive H/C setup.

I am already in line for an ls2 intake. I did consider your intake as well.
With the problems Fast has had with their TB I will probably go with your 90mm.

It may be a month or so but I will post up track results in a month as long as I get the intake soon.

ls6 w ported TB vs ls2 w 90mm

Brad

Thanks for posting the results, Jim. :thumb: Like I mentioned in my email, I'll be talking to ya as soon as my LS2 intake comes in. That TPiS TB that Myron showed me at Indy was a very nice piece.

Cheers,

Andrew

Cool comparision. I will use this as a comparision only and never quote those dyno numbers to anyone and say that your A4 should produce x amount of power based on what your car made.
Congs on being one of the only A4's to make 400+HP with stock heads and stock cam.
Thanks for the info and I am not trying to bash but have to call BS on the dyno numbers on this one.

So it is down 70rwtq at 2900 rpms? That sucks.

As far as you putting down 402rwhp on a stock heads/cam LS1 -AUTOMATIC? Bull-fucking-shit! No freaking way. Are we comparing SAE numbers to uncorrected numbers?

Got me a TPIS oval and intake... looks stout.. I have pics but they are to big to put on here send me a PM if you want some of mine on my car. I live about 20 miles from TPIS.... I have no numbers to put on here but going racing right now.... 1/8 mile..

Stupid 273 gears :bang:

I thought it was already showed that the LS2 intake didn't flow any more port for port to the LS6. I'm not surprised that the car didn't gain. With all the people wanting to swap to this intake, I would assume the only gains will be from the larger TB, not the intake. Although it is a cheaper way to get a 90mm to mate up to you car.:)

Just thought i would add that this test was not done by tpis. it was done by pro auto tech in Fla.the info was sent to tpis for our own knowlege .we just thought we would share it.

Post your times. Curious to see what you run. I have a similar setup (w/o Nitrious) and would like to see your numbers. I'm going to Cedar Falls Raceway tomorrow.

Sorry guys...
 

I have personally opened up all three LS-1, LS-6, and LS-2 intakes for comparrison and modifications. I have to say, I think someone's pumpin their outhouse into your ears...The only step down GM took with the LS-2 intake is their friction welding(90% sure it's friction welding) process of assembling it. The floor is even lower than the LS-6's, the runner inlet ports are a lot smoother, AND it has a full 90mm opening. All you guys do is chop off the factory inlet and replace it with a larger, yet still smaller the the LS-2 inlet.
I'm not trying to start a shit fight here. I haven't before seen dyno numbers comparing TPIS to anything, I'm just trying to make some sense out of those figures. Think about it...9rwhp, 20rwtq, and holding a minimum of 5rwtq through the entire band. All with a (though slightly)lesser intake, and a smaller throttle body. Think!!! :bang:

Oh, and also...I too agree on the whole 402rwhp LS-1 A4 situation. I've seen a lot of 360's and a couple low 380's, but NEVER heard of an A4 LS-1 even near 400 with just bolt-ons. What would .010" off of a set of heads get you, 2hp max?

aren't the 1.85 rockers going to have a similar effect than swapping cams?

Thats what I was thinking too. The heads are milled as well. Sounds pretty high, but possible.

Brandon

The rockers provide a little lift, and maybe act as another 2* of duration. Definitely not like switching cams.
Also, rule of thumb(not 100% accurate) is .006" mill is 1cc of chamber volume. So he's at most around 65cc's in the chambers instead of 66.67. That's what, 10.2-10.3:1? A tenth or two of a point of compression would not yield much of anything. 2hp maybe?

I think im going say "thanks for the info TPIS" but none of the results make any sense...

first theres no way a stock camm'ed non z06 c5 will make 402 to the tire on stock heads/cam with that setup....and if it does, sell it for LOTS of money cause it can run with heads/cam cars...

We did the testing in our shop in Fort Myers Fl. We have done testing for TPIS here is Florida for years!
The vehicle was a 1998 C5 Automatic This is my personnal C5 that has
countless hours of tuning and testing with the following Mods:
Haltech Trap (feeding Tiger Shark Bumper)
TPIS 90 MM Wide Oval
Ls6 Intake (Extrude Honed)
TPIS Wide Oval Nose Port Matched
Stock Heads milled to yeild 11.3 :1
Z06 Sodium Valves and Z06 Springs (No Port Work)
SLP 1.85 Rockers (Stock 98 CAm)
Comp 7.350 Pushrods
Brisk Spark Plugs
TPIS Wires
TPIS Headers
Dr. Gas X-Pipe (NO CATs)
TPIS Rear Exhaust
Many Many Hours of tuning!
Best Dyno HP 417 STD Correction 399 TQ
Day of testing the Ls2 Intake 403.5 HP STD 393.15 TQ at peak Baseline
392HP STD 371 tq std with LS2 at peak
The increased plenum volume of the LS2 reduced the natural ram air effect
that occurs around 4500 RPM! I would expect it to make HP gains on
Big flowing head and cam and large Cubes I would not expect a torque
increase in this rpm area! The fast intake is very similar
Hope this helps any confusion!