ok well I'm starting to belive that unless you have cam and heads, upgrading your TPI unit is totally useless, and I have the time slips to prove it...I have seen no gain.
so bring it on! lol...no seriously, you guys seeing any gains??

 

Well, I've seen some massive gains from using a stock TPI and runners, 3 full seconds actually!

Of course, that's using the stock TPI compared to my former stock MPFI (V6 induction system)...hehehe... Sorry, I just thought this one needed to be moved back up top.

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89 Formula

 

I have to agree with the guy. The Accel intake I bought was a total waste of money. I have seen no gain whatsoever althought that MAY be because I still have the stock runners.

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92 Z28 5.7
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Trick Flow 23° heads, Comp Cams XR270HR-10 cam, Accel intake base + ported TPI,
TES headers, Flowmaster catback, MSD ignition, #24 SVO injectors, 1LE aluminum driveshaft.

Click here to see pics of my car.
Check out our car club Truspeed
Check out the Bin Archive for all your .bin needs

 

I'm running an 87 Vette with early AL heads. A fully ported Edelcrap HiFlow Runner and Base flowed 8% better than a ported stock TPI. The stock heads were not much better than the stock TPI and were worse than the restrictive stock exhaust manifold.

 

see what I mean? and you have heads...were I got crapy 882's and stock cam...go figure...I wonder if the money would be better spend extrudehoning the hole thing...I have the edelbrock base and slp runners, and the base seems to be a bit bigger than the stocker....and the runners, well by being siamesed and all you'd figure it would "help out" but h*LL no...still hit "da wall" at 4800 and tops end at 4800 in D (with about 600lb of people in the car...) I came up with an acronim for SLP "Sure Lack of Power"...c'mon people bring it on! prove me wrong, I say that all those aftermarket intake is either for 383's or bigger or 350 with big cams and big heads, and/or is a waist of time...(ps: talking about ltr set up...not MR or SR...)

 

I dunno what you guys are talking about, I gained 35 HP and 37 TQ at the wheels by changing from a ported stock intake to TPIS intake and runners.

(but I also changed the cam and the headers too)


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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

the power comes from the heads as soon as you
switch to better flowing ones you wiil notice
a big differance between stock tuned port
and aftermarket tund port stuff.

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388 SuperRam, DFI, Vortech R trim ,N.O.S.,alki injection,
Dart sportmansII heads,50 pound injectors, Headman full headers
duel 3' exhaust,and Flowmasters, Ford nine inch with 370's
Ronal rims with Nitto drad raidals.

 

Mirage Im in the same boat as you! I have the edelbrock base and slp runners and have not gained anything either even with a little better cam I have a comp-cam L-.480/.480 Dur@.05-210/220 LSA112.I think our stock heads are what's hurting performance.At SLP's customer appreciation day this weekend I was nose to nose with LS1's untill 80mph then they would pull away like I was standing still.It's has to be the heads!

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89 350 TPI,comp cam,edelbrock intake base,SLP headers,highflo cats,flomaster cat back,accel 300+ ign,ported plenum and runners,ported maf,auto w/shiftkit,cold air induction,AFPR,Ed wright chip,3.23 posie best ET 14.011@98.72mph without cam/New best 13.926@98.27mph

 

I'm contempleting the ram jet intake and the vortech heads....hummm...and some 1.6 rockers...it should get 350hp (since we have about the same cams in our L98)...
anyway...anymore of you have had no gains?

 

My Accel base gave me 2mph and two tenths even after the addition of my 96 lb roll bar. I am not sure what you guys are doing wrong.