What all can i do to add Horse power. Thanks

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Matt Matson

 

I have an 89 RS with the L03 (TBI 305) engine in it and a 5-speed. I added a Flowmaster cat-back, and that helped a little, but the biggest difference I've done so far is adding headers to the aftermarket cat-back. The headers offer a definite seat of the pants improvement and the car pulls much harder then it used to.

After you've opened the exhaust up, you can start by changing the TBI intake to a carb intake with a TBI adapter (adapter made by Holley), and changing the heads. To maintain your street legality with the least amount of custom work, the World Products S/R Torquer 305s are probably your best bet. They're only $730 a pair (assembled) and should provide you with a definite increase in power.

The other heads you'll hear about for the 305s are the Vortecs and the L98 Vette heads. Neither of these have the EGR ports in the head so you'll lose your street legal status (although some people do it and get away with it), as well as your EGR system. Furthermore, the Vortec heads have 64 cc combustion chambers which will lower your compression. No doubt you'll get a power increase with the Vortecs, but the lost compression will slightly offset the gains that would have been made if the Vortecs came with 64cc chambers. The Vortec springs are also only good to about .450" of lift, which will limit your cam choices unless you change the springs. The L98 Vette heads have the advantage of being aluminum, they still flow good(Hey, they power the 355 hp ZZ4), but they don't flow as well as the Vortecs, and they have the smaller 58cc combustion chamber which will maintain your compression. They also comes with springs that are good to .500" of lift which will increase your cam choices dramatically without needing to change valve springs. The L98 heads are available assembled for about $800/pair, while the Vortecs are available assembled for about $450/pair. You can the price makes the Vortecs very attractive.

As far as intakes go, the Vortecs require their own type of intake, the L98 Vette heads require 86 and before intakes, while the S/R Torquer 305s are available for either 86 and before or 87+ intakes.

Whatever you do, I'd say start with exhaust, let the engine breathe out better and then you can start adding heads and intakes to let it breathe in better.

Any questions, just ask

Jason

[This message has been edited by 89BlwnRs (edited June 05, 2001).]

 

True Dat!!!

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92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi

 

you can do just about anything with a 305 tbi. tonsd of performance stuff for every part of the car.

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91 camaro RS
- 305 TBI
Mods: Performer TBI intake, 1" TBI spacer, K+N, jet fan switch ,160 thermo,Accel control module, Jet Stage 2 chip, edelbrock TES headers, Compleate 3" Flowmaster exhaust, Edelbrock springs, KYB struts and shocks, 700R4 built by TSI, SLP tq converter, b+m trans cooler, white guage faces, megashifter..
next month: spohn LCA's and panhard rod, BMR relocation brackets, 323 gear

 

please do a search. thanks.