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what do I need to get to 400 hp.

This is a discussion on what do I need to get to 400 hp. within the External Engine forums, part of the LSx Technical Help Section category; I have a 99 trans Am with 43,000 miles on it stock accept for ws6 air box and K&N air ...

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    pewter
    99 Trans Am

    Wink what do I need to get to 400 hp.

    I have a 99 trans Am with 43,000 miles on it stock accept for ws6 air box and K&N air filter. plan on spending some money on it after 15 years of going stock, I feel that 400hp will be a nice 16th birthday gift. What do I need to have done to reach this number. Not buying a engine want to keep my low mileage engine. what places do any of you know of that take on a job like this and do great work not just good.

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    Moderator 98TransAmWs-6's Avatar
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    Well depending on your budget depends on how you get there. You can easily get well over 400 if you have the money. The cheapest route would be to get airbox lid, headers with a y-pipe and catback, cam, and ls6 (243 heads). You may be able to get away with out heads but I would suggest it especially if going with a big cam. I would suggest upgrading the suspension at some point as well as once you get higher in the power levels you will not be able to put that power to the ground adequately.

    Also there are supporting upgrades I would do as well in order to prevent things from breaking from the additional power like a better timing chain and oil pump, upgraded valvesprings, chromoly pushrods, etc.
    Last edited by 98TransAmWs-6; 09-20-2014 at 01:59 PM.
    1998 Trans Am WS6 - Phantom
    421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts premium rotors, Hawk HP+ brake pads, VFN WSQ Hood, C5-R timing chain, SLP oil pump, E85 tune, Walbro 450 fuel pump, Deatschwerkz 95# injectors, Breathless performance headlights, Frost Tune, !HVAC.
    (Coming Soon) BMR DSL, UMI TQ Arm
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    Moderator 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    If you're looking for 400rwhp, you'll need about 480hp at the crank. That's assuming a 17% drive train loss. If you want 400hp at the crank, that's only 50-60 more than you have now, or about 40 more rwhp. Big difference between the two. Which are you aiming for?
    It's on jackstands.

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    99 Trans Am

    want 400 at the crank. I noticed that you said that it would only be a 50 or 60hp bump in performance. what is the horsepower rating on this cars, like I said all I have done is a ws6 airbox a lid a k&n air filter and a ws6 hood.

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    Moderator 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    Well, the 99 has a little less than the 2001/2002 models since they have the LS6 intake. I didn't take that into consideration. I would guess about 320ish. LS1 later models are rated at 325, but in all honestly they are closer to 350. With that said, I would say that the LS6 intake, headers, and a full exhaust would put you at high 300's. Throw a cam in there and you'll easily be over 400. Try not to get too hyped about hitting an exact HP level though. The most important thing is that the car runs solid.

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    1997 pontiac firebird

    Full bolt ons should get you really close to that goal.

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    Junior Member 99ss405's Avatar
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    headers cam converter tune

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    Quote Originally Posted by 35th-ANV-SS View Post
    Well, the 99 has a little less than the 2001/2002 models since they have the LS6 intake. I didn't take that into consideration. I would guess about 320ish. LS1 later models are rated at 325, but in all honestly they are closer to 350. With that said, I would say that the LS6 intake, headers, and a full exhaust would put you at high 300's. Throw a cam in there and you'll easily be over 400. Try not to get too hyped about hitting an exact HP level though. The most important thing is that the car runs solid.
    truth !!!

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    Well since you have your intake upgraded already... I'd go with LT headers, SLP loudmouth 1 or 2 catback, Underdrive pulleys (those are cheep and it will give about 10hp), Cam, and some STICKY tires... that will definitely get the job done.
    Last edited by Alwyn the Wolf; 02-19-2015 at 10:49 AM.
    RIP 1999 T/A NAVY BLUE METALIC SLP Lid. BBK 80mm TB. High Lift Comp Cam. OR Y Pipe. SLP LM2. 3.73 Gears.
    1998 T/A WS6 BLACK. Volant Cold Air Induction. Ported TB. Straight Piped.

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    Senior Member Naaman's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    Well, the 99 has a little less than the 2001/2002 models since they have the LS6 intake. I didn't take that into consideration. I would guess about 320ish. LS1 later models are rated at 325, but in all honestly they are closer to 350. With that said, I would say that the LS6 intake, headers, and a full exhaust would put you at high 300's. Throw a cam in there and you'll easily be over 400. Try not to get too hyped about hitting an exact HP level though. The most important thing is that the car runs solid.
    For what its worth, my 98 came with a dyno from the previous owner when I bought it. 275 rwhp, 296 rwtq. I figure that puts it at around 320 - 325 at the crank. It had an air lid, K&N and a cat-back on it. Other than that, should be the same as the 99, I think, though the factory always rated the birds a few horsepower higher than the Camaros...
    Lid, Throttle Body, LS6 Intake, Heads, Cam, Magnaflow, LS7 Clutch, SFCs, STB, Panhard Bar, Strano Springs, Hollow Sway Bars, Poly/Roto LCAs, Konis, MGW Shifter

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    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/a little mods...

    was that on a Mustang dyno or a very stingy dyno? That's quite low.

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    Senior Member Whamhammer's Avatar
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    Quote Originally Posted by Naaman View Post
    For what its worth, my 98 came with a dyno from the previous owner when I bought it. 275 rwhp, 296 rwtq. I figure that puts it at around 320 - 325 at the crank. It had an air lid, K&N and a cat-back on it. Other than that, should be the same as the 99, I think, though the factory always rated the birds a few horsepower higher than the Camaros...
    I agree with SMWS6TA, that output sounds lowe compared to what Ive heard from every other dyno ( usually 290-300 rwhp).

    As far as "'birds being rated a few horsepower higher than the Camaro" from the factory, where have you seen that? I havent seen a deviation between the two since late 80's 305 TPI automatics, mostly from the way the air was ducted. Between the two.

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    Moderator 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    Every dyno is different. Hell, even the same dyno on the same day on the same car produces different results. Lots of variables involved. Air, dyno setup, humidity, temperature, elevation, tune, the dyno itself, how well was the motor running, cold run, hot run, hood open, hood closed, tire position on rollers, gear selection, rear end gearing, tire pressure, mass of the rear wheels, fuel octane, etc etc etc.

    Wouldn't get too caught up on numbers.

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    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/a little mods...

    Jon I agree with what you said just that those numbers are quite a bit different then what I've normally seen with stock cars, Hell mine was with similar setup, A 98 with stock heads, dyno with a LS6 intake and LT's on a 85* day around 340ish with a Frost tune.

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    Moderator 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    I agree they look a little low, but could have been a Mustang Dyno on a stock tune with a number of those variables hindering it some. Hard to tell when he wasn't there to witness it. A Frost tune and headers offer huge HP/TQ gains.

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    Senior Member Naaman's Avatar
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    98 Z28 Vert M6

    I don't know the details or even whether the couple of bolt-ons were installed when the dyno was run. All I know for sure is that it was done somewhere in Washington state. Altitude was probably a little bit high, but I don't know (I'm basing this off of how fast I can run in WA vs some of the lower altitudes in southern states, such as NC or MO... I was always slower in WA).

    In any case, that same set up with only a ported throttle body added to it was able to hang with an LS2 Corvette from about 25 to 105 before the Corvette started to pull away (and only very slightly)... though that could also be attributed to the driver mod.

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    Senior Member Naaman's Avatar
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    Quote Originally Posted by Whamhammer View Post
    I agree with SMWS6TA, that output sounds lowe compared to what Ive heard from every other dyno ( usually 290-300 rwhp).

    As far as "'birds being rated a few horsepower higher than the Camaro" from the factory, where have you seen that? I havent seen a deviation between the two since late 80's 305 TPI automatics, mostly from the way the air was ducted. Between the two.
    I seem to remember the SS being rated for 325 or 335 horsepower and the WS6 being rated for 345... the wayback machine might be able to confirm this...

    2002 WS6 rated for 325 HP/350 ft.lbs http://web.archive.org/web/200212131...ransam_coupe#1

    2002 SS rated for 325 HP/350 ft.lbs http://web.archive.org/web/200304131...am_catalog.pdf

    Maybe it was the Firehawk... :/
    Last edited by Naaman; 02-20-2015 at 01:54 PM.

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    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/a little mods...

    That might be the culprit right there. Altitude.
    Last edited by SMWS6TA; 02-20-2015 at 01:55 PM.

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    Moderator 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    I believe 325HP was the rating for the standard WS6 and SS package. Cars which came equipped with the SLP lid/cat back were said to have been rated at 345HP.

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    Senior Member Naaman's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    I believe 325HP was the rating for the standard WS6 and SS package. Cars which came equipped with the SLP lid/cat back were said to have been rated at 345HP.
    Yeah, okay... that's what I thought.

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