305 tpi vs 350 tpi. Say they are both '89. Only diffenence I can think of is fuel injectors, and possibly different fuel pressure setting. So if I buy a 305 TPI, all that needs upgrading is fuel injectors and AFPR??? What about MAF? Anything I am missing?

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89 GTA Trans Am L98
Wins: 2 Early 90s Stang GT, 4 wheeler, Chevy Malibu
Losses: New Camaro...bastard

 

actually, the induction systems are the same.. same injectors etc. the cam is slightly bigger ont he 350 and it has more cubes.. that it for differences...
Steve

 

are we talking about the intake itself?if you are the ONLY difference between the two intakes are the injectors.19lbs ofr the 305 and 22lbs for the 350.a 305 and a 350 TPI both run on the same fuel pressure.

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1991 banditt2 #130 of 600
Project 350 TPI Banditt II
http://www.street-dawg-racing.cityslide.com
http://photos.yahoo.com/tonysams72
http:/discussion-board.com/GreaterCincinnatiFBodyAssociation/

 

little GTA are you thinking about putting a 305 TPI in a GTA?please say your not!!by the way the MAF's are the same on the 5.7's as are the 5.0's

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1991 banditt2 #130 of 600
Project 350 TPI Banditt II
http://www.street-dawg-racing.cityslide.com
http://photos.yahoo.com/tonysams72
http:/discussion-board.com/GreaterCincinnatiFBodyAssociation/

 

No...I'm thinking of buying a 5 speed w/ 305...and would eventually slide something with more cubes in there. Wondering what might need upgrading in the induction department. I just want a manual real bad, and feel it's easier to buy a manual car than convert my current one to manual. plus it needs a lot of work (interior, a little body work, and it has 160K miles) still does low 14's with only exhaust upgrade.

 

The injectors are different, 19lbs vs 22lbs, the PROM is different (they dont make 350 5-speed PROMs so I had to use a 305 5-speed PROM until I started making my own), and the EGR valve and the knock sensor is possibly different. If you're looking for a 305 5-speed to buy, get one with dual cats (89-92). They are rated at 230 HP, compared to 205 HP for the single cat cars, and its definitely worth it. They also have better rear gears and almost always disc brakes.


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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=-

 

Is it true (what I have read) that the 19 lb injectors actually work better on a 350 since they don't run as rich? OR At what point would these 19lb injectors become a restriction?

 

I have a single cat and 220 horsepower..did you mean just from 89-92?

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• Red '88 IROC 5 Speed 305 TPI w/3.08
• Dual Friction Stage III Centerforce Clutch
• Accel 300+ Racing Ignition
• Accel 300+ Pro Sleeve Plug Wires
• AC Delco Rapid Fire Plugs
• Flowmaster Force II 3 Chamber Cat Back Exhaust
• Hypertech Chip
• Hypertech Airfoil
• Gutted Air Box
• Best Maryland (40 degrees) E/T 14.686, 60' 2.205, 1/8th mile 9.461, 1/4 mile MPH 93.91
• Best Florida (80 degrees) E/T 14.88, 60' 2.163, 1/8th mile 9.540, 1/4 mile MPH 92.74
• Best 60' 2.163(Florida)
• TPiS AFPR set to 42psi using Accel Fuel Pressure Gauge (Installed after Maryland run)
• Aluminum Driveshaft (Installed after Maryland run)

 

theyre both tpi....ummm i just wont **** anyone off. the injectors are about the only diff.

19lb 305
22lb 350

different programing for a 350 also i think just to deliver more fuel to the injectors. the 350 also has a little more intial timing than a 305.

off the subject the 350 cars usaually have deeper gears? i think.

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89 firebird formula

360 11.0:1compression (350 .060 over)/fully balnced and blueprinted
comp cams xe262 cam
performer rpm intake/port matched to heads
#1407edlebrock 750
sportsman 2 heads 64cc 2.02/1.60 valves 200cc intake runner/cnc pocket ported
msd 6al/msd8.5 super condutor wires
h.e.i. proform 50,000 volt vac. advance ditributor
700r-4 with 3.08 first gear and 3.23 posi 7 5/8 rear end.
b trans shift kit(will kill shifts...suck dong!!)
shorty heddman hedders with custom 3" pipe y-pipe back(no damn cat!) with 40 series flowmaster!
griffin daul1" core rad.cutom fabrication to fit(but no cutting )

future mods: 406 roller REALLY REALLY REALLY RADICAL!!!!!

 

Yes, I said 89-92 just before that sentence.

 

350 TPI cars can have 2.77 or 3.27/3.23 gears.
305 TPI 5-speed cars can have 3.08's, 3.42's, or 3.45's. The 5-speed cars have deeper gears.

 

When you do the swap make sure you have the right knock sensor too. The 305 and 350's use differnt knock sensors......

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[This message has been edited by 92GTA (edited April 25, 2001).]

 

The stock 305 injectors will work fine on the 350 with a adjustable fpr and around 50 psi fuel pressure.

 

IN reference to the knock sensors...are you sure this is true for an 88 or 89? I thought that was the case for 90-92. I could be wrong.