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Dynoed the Trans Am...

9

96Firebird

Diamond Member
Needed a tune, just wasn't running right. Info about the car and mods below...

2002 Trans Am WS6
93,xxx miles
5.7L LS1, 6-speed

SLP lid
SLP smooth bellows
Stock LS6 intake
American Racing longtube headers
American Racing off-road Y-pipe
Borla catback

Other mods, but they don't effect the numbers much (suspension, shifter, etc...)

Car made 322HP/336TQ before tune, 336HP/350TQ after tune. Car runs much better, nice and smooth. Graph below doesn't start at zero, so the gains look larger, but I'm happy either way.

Next mods include ported TB, heads and cam, and 25% UD pulley. I'm sorta worried about camming with so many miles, but we'll see what funds look like this winter...

img20120607162736.jpg


img20120607202117.jpg


And a quick video...

http://www.youtube.com/watch?v=veAF2aX4wws
 
nice

my dads 99 SS has alot of the same minus the headers

been on him to get a tune for years, he runs rich in the mid revs and its just annoying to me when I drive it
 
Yup, SOM. Wasn't even looking for that color when I was searching for a Trans Am, but I saw it for sale and fell in love.

I'm really happy with the gains in the torque over the whole RPM range, much better ride just cruising as well.

Thinking about getting 4.10 gears next, the 6th gear is pretty much useless in this car.
 
yep, the numbers are one thing but the drive is what counts. I have seen higher numbers and yet worse manners or driving responsiveness.
 
Not bad for so little work done and a car that only came with 300ish HP at the flywheel.

H/C and you'll swear it's not even the same car.

Cam won't hurt anything regardless of miles. You have to put in new bearings and lifters anyway.

Nice cam with a 100 shot and 315 ET streets out back and call it a day 🙂

When a ricer laughs and asks whats wrong with your car when it keeps trying to stall at the light, you're doing it right.
 
Last edited:
96Firebird said:
Yup, SOM. Wasn't even looking for that color when I was searching for a Trans Am, but I saw it for sale and fell in love.

I'm really happy with the gains in the torque over the whole RPM range, much better ride just cruising as well.

Thinking about getting 4.10 gears next, the 6th gear is pretty much useless in this car.
Click to expand...

4.10's are fun. Just threw a set in my Mustang.
 
exdeath said:
Not bad for so little work done and a car that only came with 300ish HP at the flywheel.

H/C and you'll swear it's not even the same car.

Cam won't hurt anything regardless of miles. You have to put in new bearings and lifters anyway.

Nice cam with a 100 shot and 315 ET streets out back and call it a day 🙂

When a ricer laughs and asks whats wrong with your car when it keeps trying to stall at the light, you're doing it right.
Click to expand...

Rated 300hp flywheel, would dyno around 300 stock.

As for the cam, do it. However, you do not put in new bearings or lifters during a cam swap. The heads have to come off to change the lifters and the bottom end would need to come apart to change the bearings. Definitely not standard for a cam swap which on an LS1 car is usually just the cam, valve springs, push rods.
 
exdeath said:
Not bad for so little work done and a car that only came with 300ish HP at the flywheel.

H/C and you'll swear it's not even the same car.

Cam won't hurt anything regardless of miles. You have to put in new bearings and lifters anyway.

Nice cam with a 100 shot and 315 ET streets out back and call it a day 🙂

When a ricer laughs and asks whats wrong with your car when it keeps trying to stall at the light, you're doing it right.
Click to expand...

The LS1 f-bodies were underrated not to piss off corvette owners. Rated at 305 and 320hp for the ram air's but usually dyno'd at or over 300rwhp bone stock
 
Trade ya 😀.

Love SOM, actually I think a Camaro SS looks the best in SOM, but the TA still looks awesome.

Just got my '01 WS6 repainted a couple weeks ago. Same color as it was, didn't want to spend a ton to change colors. Sucked though cause the day I had to drop it off there was a local dyno day. Found out after I made the arrangements. Been wanting to take it forever:

img0298zv.jpg

img0299nk.jpg

img0304gl.jpg

img0292sp.jpg
 
96Firebird said:
Yup, SOM. Wasn't even looking for that color when I was searching for a Trans Am, but I saw it for sale and fell in love.

I'm really happy with the gains in the torque over the whole RPM range, much better ride just cruising as well.

Thinking about getting 4.10 gears next, the 6th gear is pretty much useless in this car.
Click to expand...


What do you mean useless. It's for getting good gas mileage on the highway. You can downshift for acceleration.

The fear of downshifting is why manual transmission cars now get worse highway mileage than the automatics!!
 
Throckmorton said:
What do you mean useless. It's for getting good gas mileage on the highway. You can downshift for acceleration.

The fear of downshifting is why manual transmission cars now get worse highway mileage than the automatics!!
Click to expand...

Exactly. On the highway at 70mph is perfect for 6th
 
Throckmorton said:
What do you mean useless. It's for getting good gas mileage on the highway. You can downshift for acceleration.

The fear of downshifting is why manual transmission cars now get worse highway mileage than the automatics!!
Click to expand...


That's because people in focus groups drive the car and complain they can't overtake when doing 50 in top... Or that it doesn't feel peppy enough because they aren't driving it right... Example 6th in the new BRZ manual is lower than 5th in the auto, which results in using more gas and that bumps it up several CO2 taxes :thumbsdown:

Although speaking of such my tax has gone up too, obviously to subsidise the government's loss due newer cars generally producing less CO2.
 
Throckmorton said:
What do you mean useless. It's for getting good gas mileage on the highway. You can downshift for acceleration.

The fear of downshifting is why manual transmission cars now get worse highway mileage than the automatics!!
Click to expand...

Most highways around here have a 55mph speed limit, which means I go 60-65mph. With traffic before and after work, traffic goes from anywhere between 55-65mph. At 55mph, 6th gear won't cut it. In 5th, I'm usually at 2000RPM @ 55mph, 2200RPM @ 65mph. This seems too high for me, so I shift into 6th and then traffic slows down, so I have to downshift back into 5th. At 65mph, 6th gear is barely enough, hovering around 1500RPM. Even then I can hear the engine lugging a bit, and the rear end makes a bit of noise.

Its just that in-between area that I feel getting 4.10s can solve, and allow me to use 6th gear more regularly than I do now. Right now I just stick to 5th gear so I don't have to wear my clutch/tranny by shifting so much.
 
96Firebird said:
Most highways around here have a 55mph speed limit, which means I go 60-65mph. With traffic before and after work, traffic goes from anywhere between 55-65mph. At 55mph, 6th gear won't cut it. In 5th, I'm usually at 2000RPM @ 55mph, 2200RPM @ 65mph. This seems too high for me, so I shift into 6th and then traffic slows down, so I have to downshift back into 5th. At 65mph, 6th gear is barely enough, hovering around 1500RPM. Even then I can hear the engine lugging a bit, and the rear end makes a bit of noise.

Its just that in-between area that I feel getting 4.10s can solve, and allow me to use 6th gear more regularly than I do now. Right now I just stick to 5th gear so I don't have to wear my clutch/tranny by shifting so much.
Click to expand...
So what if you don't use 5th gear? If you want shorter gears, you want shorter gears. But it's not like you have a "problem" right now. Use the gear appropriate for the speed.
 
96Firebird said:
Most highways around here have a 55mph speed limit, which means I go 60-65mph. With traffic before and after work, traffic goes from anywhere between 55-65mph. At 55mph, 6th gear won't cut it. In 5th, I'm usually at 2000RPM @ 55mph, 2200RPM @ 65mph. This seems too high for me, so I shift into 6th and then traffic slows down, so I have to downshift back into 5th. At 65mph, 6th gear is barely enough, hovering around 1500RPM. Even then I can hear the engine lugging a bit, and the rear end makes a bit of noise.

Its just that in-between area that I feel getting 4.10s can solve, and allow me to use 6th gear more regularly than I do now. Right now I just stick to 5th gear so I don't have to wear my clutch/tranny by shifting so much.
Click to expand...

The amount of clutch wear you see by shifting between gears normally is negligible. Transmissions are built to be shifted - you're not going to hurt anything by shifting between 5th and 6th. Unless there's a high failure rate in the 5th/6th synchros in your transmission?

4.10's will probably make first gear useless unless you're running serious tires. Your car, your call, though!
 
Don Karnage said:
The LS1 f-bodies were underrated not to piss off corvette owners. Rated at 305 and 320hp for the ram air's but usually dyno'd at or over 300rwhp bone stock
Click to expand...

I dyno'd my dads car for fathers day one year, 305 with a borla cat back and lid

ThatsABigOne said:
What is it that makes it annoying? More smell?
Click to expand...

inconsistent power curve. the dyno graph confirmed it, its not to flat of a line, lots of wiggles in the midrange. enough to feel the luls and jumps in power, the AFR was going from 12 flat up to low 13's

its now running a lid, ls6 intake, and exhaust, and with the LS6 instake it got worse
 
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