Right now, have stock TBI 305...with only a couple mods (4" Open Air Element and 3" Flowmaster Exhaust system) About how much HP and Torque (and what will i run in the 1/4 mile) should I have after I switch to a Speed Density TPI system keeping my crappy cam, heads, and exhaust manifolds? Later on I will upgrade everything else. Thanks...oh and I have an automatic.

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http://users.ticnet.com/mult68
1992 Teal Camaro RS
T-Tops
305 TBI V8
Open air element
3" Flowmaster Exhaust System w/Quad Tips
Aiwa CD/Mp3 player
10 Disc CD Changer
Rockford Fosgate Speakers
SLP Headers Coming
Dynomax High Flow Cat Coming
More to come.

 

Well I believe that in 92 the tbi 305 was rated at 170 horsepower, while the tpi 305 had 205. Hopefully you will see about a 35 horsepower increase :P I believe torque on a stock tpi 305 was rated at 285.

With the exhaust, depending on how many miles are on your car, you are probably pretty close to stock. Mid to high 15s are my guess.

 

I'm saying maybe 10 hp if anything. The TPI heads probably are a little better than TBI which is why they got the 35 horses along with other changes.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

 

I think the torque increase would be noticed more than the HP.

Didn't GM Tech do a "before and after" dyno on his TBI car when he switched to TPI? I think his torque increased like 30 or 35 ft/lbs, HP came up some, but not much IIRC.

 

I can't give actual power/torque numbers, but I did the swap on my 91 Camaro along with a few other changes and it was a huge differance. When my car was stock, 305 tbi automatic and 2:73 gears, I could not beat too many people in races, even my Wifes old stock 1991 Honda Prelude SI "automatic" was an even race all the way up to 100 mph. My car was slow, no other way to put it. I swapped to a self ported stock TPI and added Edelbrock headers at the same time, I also swapped the automatic out for a 5 speed trans. I left the 2:73 open rear in there though, so not much else was changed.... I went to the track and ran consistant 15.4s @ 94 to 96 mph , depended on the weather. At that time, the engine was the stock 305, stock heads, and the small "peanut" cam. Hopefully this will help you somehow...

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1991 Camaro RS/Z28,polished TPI, 355ci. Sportsman 11 heads, LT-4 Hot cam,Pete Jackson gear drive, on,and on, and on... 13.4 @ 104.8 with a 2:77 rear, no traction, no tuning, no practice. Car is pictured in Chevy High Performance magazine, June 2000 issue.
http://www.geocities.com/jasonsz28us/INDEX.htm


1997 GMC Yukon, 4 wheel drive, leather, loaded, Gibson exhaust, K&N intake, Boston pro series speakers..... That's it so far.

1969 Camaro,12 point cage, total project right now, I am planning an LS1 - T56 - and a Vette independent rear. Pro Touring crowd, look out! 8^)

 

Kevin L has dyno numers. its a big increase. TPI is way better for 305 than TBI. The only way TBI would be better is if you took advantage of reving past where TPI falls on its face. but up to the same RPM, TPI should be a lot better.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Soon to be installed:
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

 

GMtech did a carb to TPI swap. He didn't do any dyno runs either, all track before and afters.


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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Raptor 700R4 Tranmission, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Hooker Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
My Camaro Project

 

That was my car with the dyno runs.
Gained 17 rwhp 70 rwtq with the swap.
http://24.1.139.249/images/122000/DCP_0108.JPG

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Chronologically challenged. But still kicking!
'92 CAMARO RS
305 TBI 5/spd (now TPI)
B4C Alt.
'69 camaro-BB/Lenco,1050 dominators, /Pump Gas/no drugs 8.97-150+/3200lbs.
SoCal Thirdgen F-Bodies