Ok guys I am looking into buying a 89 GTA and want to know what it would take to get 350 HP with a 350 TPI. Actually I want to know if it is possible without spending $3000-$4000. I know i will need to put headers and new exhaust, intake, cam, and maybe heads (i don't know anything about the heads on this engine). Or should I do something else before the intake cam and heads? How much do aftermarket intake run for TPI? sorry i am only 18 and new to fuel injection because i have only worked on cars that are carburated.
thanks
Tom

 

Yes, its possible, and if you buy the parts used you can do it. If you're on any kind of a budget, dont even try it. TPI performs, and it performs well, but its strength is torque, not horsepower. My previous engine dynoed at 280 HP and 380 TQ, and ran the times you see in my sig. I added a TPIS intake & runners, LT4 HOT cam, and SLP 1 3/4" headers, and I'm hoping for over 300 HP at the wheels this time. I got the parts used.

For new parts, its like this:

Cam: $200-300
Heads: $1000-1400
Super Ram or Miniram intake: $1200-1400
SLP 1 3/4" headers: $500
Built Trans: $1000-1400

You're over $4000 right there, and thats not even everything. However, for used parts, I paid $50 for the cam, my dad had the heads, the intake was $400, and the headers were $150.


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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Supercharger?
You can get good ones for less than that.

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'88 RS (originally 2.8)
New 350, .040 over, ported vette L98s, ported stock tpi.
Old 305 injectors & chip
TES headers, 3.73 gears, 700r4.
Best with 2.8-17.4@77mph
Best with 305-15.0@93mph
Best with 356-13.7@101mph
(Damn the 2.8!)

 

Your right. I should be more worried about torque. I don't know why I always think in horsepower, when i know that torque is what matters on the street.

 

No problemo brutha





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*I do custom performance mods on Edlebrock Performer carburetors (dualplane intake mods in the works),
White 1986 Irocz, 305 with iron #416 heads,
383 with aluminum TFS heads,
Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, Vigilante 2400 lockup converter, 3.25:1 Ford 9" rear, Mcreary Road-Stars, SLP-stainless 1.75" shortie headers & Y-pipe, single 3" Borla exhaust, Linginfelter-TPI camshaft part number 74216 pulls 17" vacuum solid. Cam specs 213/219 @.050 114-LSA, sometimes advertised at 216/219 @.050 112-LSA .462/.470 lift @1.5:1 ratio. Using Harland Sharp 1.65:1 roller rockers. MSD-6AL, billet distributor, multi-retard, blaster-3 coil, and RPM switch. SouthSide machine subframe connectors, SSM lift-bars, Moroso 4" underdrive crank pulley.

N/A runs 10.9 @124,
Crack-runs 10.3 @135
haven't run at track since Oct-99
* vizit miy homepayge * http://www.geocities.com/trailerparkpage/

 

What times do u want to run??

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Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.

 

A 305 TPI should bolt right up to the 350. You may have to make a couple of adustments to the EPROM but nothing that will run over a grand.

 

350 hp is definitely possible with a 350 TPI and even with a 305, and you certainly dont have to spend gobs and gobs of money in order to get that far, and since torque is actually what youre looking for in a street car, you might consider nitrous, and ignition system, a good fuel pump, and a decent pressure regulator, I find that NOS #5151 makes a great kit for either a 305 TPI or 350, and it's adjustable from 100-150 extra ponies, since you have a 350 (hope fully its in proper tune) you can safely use all 150 horses of nitrous, although l would reccomend a good fuel pump and ignition system MSD 6 series are great ignitions, and TPIS has great fuel pumps and pressure regulators, maybe headers, and a 3.73 rear end and youre safely on your way to a streetable somewhat fuel economic street car.

 

you mean I could bolt my 383 up to my 305??!!
#$%&! dude I never thought of that!