I think you may need a tune after a ported TB
 

Went to the track tonight to see if the changes I made had an impact. It was a little cooler tonight than time in my sig yet I went slower. Actually my first run tonight with it hotter the car ran just a tad bit more MPH and ET. Tonight I managed 13.3@105 MPH after adding a 160 stat, ported TB, 25% underdrive, loop and SFC's.

All numbers almost identical to the last time out and I did everything driving the car the same. No more/less wheelspin or anything. So I had thought I would have dropped .2 and 2 MPH and should have been darn near 13.0@108 but that didn't happen. Only thing I can see is maybe the TB did something to the tune. I guess I won't really know until I get the headers and exhaust on next week and finally get a tune.

Thoughts?

I would highly doubt the tune would pick up the power you think you may be missing...a ported TB doesn't make much of a difference IMO.

Well I thought I would have saw some kind of gain instead of a loss. Like $200 for nothing LOL

Well, the stock tunes on these cars are pretty damn restrictive...I'm sure it'll wake the hell up when you get the headers on and get everything tuned.

I've shared your disappointment...I picked up a WHOPPING 1 MPH in the 1/4 when I put my headers on (Kooks). The car never did feel quite right...then I figured out my throttle body was only opening to 85%, and the tune was pretty damn rich. Sometimes it takes a little while to work out all the kinks, but in the end, I'm sure you'll end up happy.

when i put on my Lt's and o/r Y with lm2, and full intake i actually lost 20hp.....:bang: gas mileage also went to hell and a handbascuit when i installed my cam and had it tuned my gas mileage actually got better than 100% stock and the car runs a lot better and i dont mean faster, it drives smoother now! i think a tune and a stall would put a smile on ur face!

It all works together. Intake, ported TB, LT, ORY pipe, and exhaust, all that and a tune work well. I felt a huge jump in performance when I did my LTs untuned. I had intake, free mods, and a cut-out when I did my LTs. Didn't tune it for close to two years when I finally got a tune after my cam and upgraded heads. Now, when I got a bigger MAF I retuned it and lost some numbers but it was tuned better. It idlled better, ran smoother, MPG improved too. Just a ported TB won't help much. Hope this helped good luck

When I had my TB ported, I went to dyno it to see the power gain and my A/F ratio was on the lean side on WOT, I would reccomend you tune your car, you never know

Something's up with your stock tunes then. This is what I gained from each set of mods on my car. Consistent dyno location too.

Stock 315ft/lb 298HP

LS6 Intake +HP
Ported Throttle Body +HP
Lid +HP
LS7 Clutch -HP

Result Dyno 325 ft/lb 306HP Still gained despite the loss in power from the significantly heavier LS7 Clutch. Car drove great for nearly 6 months until I did the exhaust... winter with snow!

QTP Longtube headers +HP
Cats -HP
2.5 Inch True Duals + Mufflers +HP
17x11 ZR1 Rims -HP
Tune +HP (netted only 5hp and a bit of torque over the whole curve)

Result 359ft/lb 349HP (untuned 351ft/lb and 344HP)

TR224 Cam +HP
March Underpulley +HP
March Overdrive Alternator Pulley -HP

Result 373 ft/lb 381HP

I didn't see anything from my ported TB at the track. It make the throttle much more responsive around town and I'm glad I did it. But say it gave me 5rwhp at the top end. That's not going to show up at the track.

how much can you honestly expect from removing such little material? If you wanted big gains, you need to increase the opening by more than 1-3mm. Slap a 75mm or Wilson 90 on your $1K FAST intake and get the gains you wanted.

The ported TB is trying to let in a little bit more air but where is it going to go? You didn't change the cam, no head work. No flow increase, no hp.

25% underdrive they claim 10 hp, pretty hard to feel, not sure if track times will tell you it is on there.

T-stat does nothing, the LS1 likes 190-200 degrees, plus adjusting your fans should be done as well.

Get it tuned

I wasn't expecting huge gains but at least not go backwards. If I only got .1/1 MPH out of the TB and pulley I would have said okay for $250. As it stands I basically got an =

The 1k for 15 HP of the FAST/TB also doesn't equate to me so I won't be doing that one. Headers and exhaust until I get about 70k miles then I may do heads/cam.

If you don't have to change the tune after putting on a supposed upgrade than it really isn't that much of an upgrade by itself.
The TB porting is just an enhancement to a new intake or cam, nothing more. Even if you gained 10 rwhp, there are too many variables to say you could see that improvement on a timeslip. Air temp, humidity, track temp, track prep, tire temp, driver consistancy, engine temp, etc.

LS6 intake, cam, headers, and a good tune, now that will fix your numbers.

Exactly. If you were hooking perfectly both days out and coming out of the hole consistantly then the air may not have been as good the day you were out after the ported TB install. The density altitude plays a big role on how your car performs at the track. DA's can effect your 1/4 time by tenths of a second in the same day over the period of 1-2 hours... the small amount of time could be the difference between you running a 13.3 and a 13.5.

Also, there's nothing to tune for when simply porting your throttle body. Hope that helps!

Both brands are used by GM to build F-bodys. I'd stick w/ Delco but Bosch is the German equiv.

^^^I think you posted in the wrong thread. Delco/Bosch have nothing to do with ported throttle bodies.

my car got lean with every mod i done....i got sick of having to be tuned so i bought hp tuners.....honestly wish it wouldve been my first mod....hell i ran what you are running at bristol well close too it with those same mods in a 3750lb 150k car....get it tuned hell a mail order is better than a stock tune...

bolt ons
 

he is full bolt ons....

The computer on the gen 3 cars are great, they will learn themselves. I ported my own tb, I started the car it idled a little high and drove a few miles and turned the car off, then restarted it and it idled fine. I droped .2

No offense but I have a hard time believing that by just porting a TB you will gain .2, that is equivalent to losing 200 pounds in car weight and no tuning, just the PCM relearning the idle? Maybe you drove better that day, cooler?