Another HP Question
Thread Starter
Cruising
Joined: Feb 2006
Posts: 11
Likes: 0
Another HP Question
Good day, I am just new to the forum and have another beat to death HP question. Here are my mods for my 86 L98 pace car:
Edelbrock heads, edelbrock manifold, edelbrock cam, breathless cold air intake, 55mm throttle body, hi po wires and plugs, cat back flowmasters, fuel pressure regulator set at 45psi, 160 therostat.
Just a rough idea for crank and rwhp is all I'm looking for.
Edelbrock heads, edelbrock manifold, edelbrock cam, breathless cold air intake, 55mm throttle body, hi po wires and plugs, cat back flowmasters, fuel pressure regulator set at 45psi, 160 therostat.
Just a rough idea for crank and rwhp is all I'm looking for.
Last edited by Reans; Feb 16, 2006 at 03:34 AM.
Pro
Joined: Feb 2006
Posts: 688
Likes: 0
From: Concord NC
A rough estimate would be headers is 15-35, intake 10-15 55 mm no more than ten but not even that much flows add about 15 thermostat and plugs/wires just make it run better i dont think theres really a horsepower increase. Just runs colder, and better spark. Better throttle response im sure. Stock the L98 came with 230 so your probably running about 280 or so. Torque prolly hasnt increased that much with those mods but the L98 has alot of torque stock so i wouldnt worry about it to much. 
Melting Slicks
Joined: Jan 2001
Posts: 2,940
Likes: 5
From: Chesapeake VA
I also have an 86' (alum heads on mine) and I think your heads and cam will put you above 280FWHP. My 86' has TPIS LT Headers, intake, runners, AFPR, and they ported the plenum for me. My car turned 230HP and 327LB/FT on the dyno, and I am running the stock heads and cam. Assuming a 17% loss for the auto tranny (2.59 gears in my car, not that it makes a difference), and I should be seeing about 275FWHP and 390FWTQ.
You mentioned the PSI you are running from your AFPR. I would recommend that when you dyno the car you have them measure the Air/Fuel, and you will be able to dail in the AFPR and get the most out of your motor. As for your power output, I would put you somewhere between 290-330FWHP depending on how well the heads and cam work with the stock bottom end, the TPI intake style and each other.
Get to the dyno and let us know what you found!
Here is a link to the dyno graph if you are interested:
86' dyno - headers, intake, runners, afpr
You mentioned the PSI you are running from your AFPR. I would recommend that when you dyno the car you have them measure the Air/Fuel, and you will be able to dail in the AFPR and get the most out of your motor. As for your power output, I would put you somewhere between 290-330FWHP depending on how well the heads and cam work with the stock bottom end, the TPI intake style and each other.
Get to the dyno and let us know what you found!
Here is a link to the dyno graph if you are interested:
86' dyno - headers, intake, runners, afpr
Melting Slicks
Joined: Jan 2001
Posts: 2,940
Likes: 5
From: Chesapeake VA
Originally Posted by TriumphGT6
I hope I'm not missing something, but I have always used FWHP to mean Front Wheel Horsepower.
GT6
GT6
FW = FlyWheel
I should probably have used CHP = Crank Horse Power.
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Race Director
Joined: Dec 2002
Posts: 13,345
Likes: 230
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by C4driver99
Stock the L98 came with 230 so your probably running about 280 or so.
Once put on a dyno, mods seldom give all the hp we were hoping for.
Larry
code5coupe
Drifting
Joined: Dec 2000
Posts: 1,833
Likes: 4
From: Calgary, Alberta
I'm running the stock cam in my '88, stock intake, massaged stock heads, headers no cats or resoonator, stock mufflers. Fuel pressure is 40psi, any higher i run to rich. My results are in my Sig.
Thread Starter
Cruising
Joined: Feb 2006
Posts: 11
Likes: 0
Thanks for all of your input fellas. The reason for no dyno, is because I am still in the middle of Afganistan and the parts havent even been put on yet, so when I get home next month I'll be sure to get it dynoed and post the results.
Le Mans Master
Joined: May 2000
Posts: 7,033
Likes: 12
What are your cam specs, .050 duration and lift, head cfm and compression ratio, are you using the edelbrock base and with what runner system (ie big tubes, SR or siamesed. Are you going to run headers too? Post that info and you will get very close hp numbers.
What's it like in Afganistan, crappy? Do they hate Americans?
What's it like in Afganistan, crappy? Do they hate Americans?
Burning Brakes
Joined: Apr 2005
Posts: 1,110
Likes: 0
From: JUPITER FLORIDA
See my sig, I have vortec heads and the same intake system you are talking about, with hooker headers and flowmaster catback. I had a bad tune at the time and was running really lean but I made 230 horse power and 280 tq at the wheels. Since then I have ported my plenum (plus the gaskets where blocking some air flow... damn mechanic.), got a tune by alvin and my cat converter (free flow but problably clogged) actually came loose and I have notice a huge increase in power. Once I get this tranny rebuilt with a new stall converter, which is gonna happen in a couple weeks hopfully, Ill go right to the dyno. I let you know what kinda power im making.