Adding SLP 1 5/8" coated headers, SLP y-pipe, and Random Technologies 3" cat to my 91 Camaro RS 305 TBI which already has SLP 3.73 posi rear, 160 thermostat, SLP 3" cat back exhaust, and an Ed Wright computer chip. Best ET with BFG Drag Radials on Weld Pro Stars is 15.45 @87.49. What is best estimate on HP/Torque and ET gains?

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Turbo Bob

 

you ran a 15.4 with the stock exhaust? wow

expect to be in the 14s now, full exhaust on mine lopped .5 off my times

 

That is an amazing time for stock exaust.

Well Headers are usuaslly 15-20hp
Exaust is usually 10-15hp

So maybe a 25-35hp gain with ur new headers and exaust system. Have fun and bring back a new time slip. Thats amazing.

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Eric Natzke
91 Firebird 305 TBI

ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-MSD Cap & Rotor-MSD Blaster Coil-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone-Free TBI mods
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

How much gain do you think that fastchip gave you. I'm curious because I just got one for X-mas (early surprise gift) and I haven't installed it yet.

 

this is the sight i use to see what i may have picked up or lossed based on any new mph or et. it also has a section that you can altitude correct your runs.
http://prestage.com/carmath/


lata
tim

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91 Camaro RS-LO3,Auto.
14.301 @ 94.39mph
The car is going street strip for next season. 13's here i come!!!!!
Edlebrock TES Headers, Cat Eliminator Pipe, Borla Adjustable Cat Back,Marche Pulleys, HyperTech Chip,Transgo Shift Kit,B&M Convertor(2000stall),Steve Spohn Rear Rig( all rod ends), Poly Front Bushings,Ported TB, 350 Injectors, Edlebrock Performer TBI Intake, Performer Heads, 1.6 Roller Tipped Rockers
http://www.mycar.net/mafb/registry/detail.cfm?id=299

 

Pablo,
I ran the 15.45 with stock exhaust manifolds, stock y-pipe, and stock cat converter. I have the SLP 3" cat back exhaust installed on the car.

 

Pukka,
I figure maybe 5 HP gain when the Ed Wright chip was installed. Felt a noticeable difference at the track after the chip was installed. I also checked the timing after the chip was installed which was 4 degrees advanced versus the stock chip which was 0 degrees BTDC.

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Turbo Bob

 

Tim,
How hard was the Edelbrock TES header installation? Were they coated? Also where did you get the cat eliminator pipe or did you make it yourself?

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Turbo Bob

 

the tes headers weren't too bad to put in. if you have an a/c you will have to remove the pass side valve cover to get the pipes in. on the drivers side it makes it a lot easier if you disconnect the steering shaft. i got my pipes coated by jet hot, i think edlebrock only offers them chromed which doesn't hold up worth @#$%&&.
for the cat eliminator i just found a piece of 3in tube and welded the slip fit part from my cat to it and welded the other end to the cat back. watch were you live if ya wanna try this at home, it will triple how loud you car is, my neighbors already hate me so i didn't mind too much
the cat did give me .5mph in the quarter too.

lata
tim

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91 Camaro RS-LO3,Auto.
14.301 @ 94.39mph
The car is going street strip for next season. 13's here i come!!!!!
Edlebrock TES Headers, Cat Eliminator Pipe, Borla Adjustable Cat Back,Marche Pulleys, HyperTech Chip,Transgo Shift Kit,B&M Convertor(2000stall),Steve Spohn Rear Rig( all rod ends), Poly Front Bushings,Ported TB, 350 Injectors, Edlebrock Performer TBI Intake, Performer Heads, 1.6 Roller Tipped Rockers
http://www.mycar.net/mafb/registry/detail.cfm?id=299