silverTA2002

iTrader: (1)

Mods in sig.

Dynojet 224x.

88 degrees outside, 80% humidity.

A/F was right at 13.0. Timing was fine, no KR. I leaned it out 3% and gained about 4 tq down low, nothing up top.

DEFINITELY not the best out there. I was pretty disappointed.

For a couple comparisons from today.... My brother's Trailblazer SS was down 22 rwhp to his dyno in February. He only did 312rwhp. And he's tuned.

A 2000 corvette auto with 205 heads, stock cam, full intake and catback exhaust only did 308rwhp, 314rwtq.

A 99 Z28 with a lid and catback did 301rwhp, 312rwtq.

A few pulley, intake, tune, exhaust 03-04 Cobras put down 420-440rwhp.

Needless to say, that pretty much sucked. I was hoping for at least 380rwhp. The conditions definitley took away at least 20hp, and I'm missing a few bolt ons, but still...... I wish I had done an STS kit to start with instead. Same $$ I've spent on mods, and the guy there with a BONE STOCK ws6 with an STS kit (on another day) put down 425rwhp on 5psi, and 508rwhp with methanol injection on 8 or 9 psi.

Patrick G

iTrader: (14)

Sounds like you have good mods. I'd get a second opinion. Find another dyno from a dealer who puts out results consistent with the rest of the country then report back. You will probably find your missing hp.

WS6TransAm01

iTrader: (13)

Shouldn't the dyno corect for non STP condisions? As in SAE #?

silverTA2002

iTrader: (1)

They said it was SAE corrected, but since we're basically at sea level, it didn't change much.

The shop owner said we'd be about 15-20hp down from good weather conditions.

oange ss

iTrader: (50)

it wont be that much of a difference from "good weather conditions"...there's something screwy with the dyno or operator

silverTA2002

iTrader: (1)

I dunno. It seems consistent with my track times.

Last time at the track, in 80 degree weather and high humidity.... 12.8 at 111mph. Clutch slips a bit on the launch, but fine after that. 2.0 60' on drag radials.

Since that 12.8 run, I've tuned the VE table, recalibrated the MAF, and dialed in the A/F and timing a little bit better. SOTP I've gained about 15hp maybe since that drag run.

Things hurting my power....
Stock TB
Stock pulleys
Jet Hot Y pipe with cats. The Y pipe kinda sucks.
Not a real catback, just a muffler swap
Weather
My car.... just doesn't respond well to mods.
13.0 a/f on dyno. Could be a little richer. I only got 2 pulls (dyno day $40).

Here's my car's modding life....

Stock 13.8 at 103mph
Lid, FRA, muffler swap, Long tubes, basic tune 13.4 at 105mph
add Heads/cam, TB bypass, Drag radials, sub frames (+20lbs), removed spare tire and subwoofer (-60lbs) 12.8 at 111mph

All in 70-80 degree weather with high humidity at sea level. All with 2.0 60'.

silverTA2002

iTrader: (1)

The only other dyno I've got (which I never believed) was 3 dynos from a dynojet in Ft. Meyers. I wasn't there, some mechanic friends took my car to a dyno class.

The best of the three from that day was 351rwhp and 375rwtq. That was untuned after lid, muffler, FRA, and long tubes. I didn't believe it, because I was running a 13.5 at 105mph at the time.

Detroitmuscle

iTrader: (16)

Sounds very similar to my case, see sig. I also haven't run impressive times but I have many factors that could be hurting me. I have run a best or 12.85 at 110 so far on worn Nittos at a shitty track with dirt pits so we'll see once I put a real tire on and head to Milan but I dunno what is up with the car.

silverTA2002

iTrader: (1)

Yeah, welcome to the club I guess.

Honestly, the reason I post my numbers (knowing full well people will say something is wrong with my car) is because I get tired of seeing only the best numbers from people in the best conditions.

The car is strong. It drives great, no smoke out the tail pipes. And it has NEVER been in the shop for ANYTHING other than modifications. In fact, the only thing that has ever gone wrong with the car was after 4 years it needed a new battery.

It just doesn't respond well to mods. I've also never tested it in good weather either.

_HAVOC_

iTrader: (5)

where did you dyno at? ive dyno'd at both RX and Race Related and there dyno's are both right on.

streetwarrior96

I just had a friend hit 386 RWHP with LS6 intake, headers and TR230/224 cam

silverTA2002

iTrader: (1)

Modular madness in sarasota.

It seems like the dyno was about 20hp low based on the results from other people there.

The best comparsion I've got is my brother's LS2 rwd trailblazer SS. Tuned by diablosport as their beta tester, he made 334 rwhp. On this dyno, it was 312 rwhp. No changes made, car is bone stock otherwise.

Doc

iTrader: (9)

Dude, it sounds like you have a really sweet car. The H/C combo you have are definitely not being allowed to do their thing. I take it you have the LS6 intake? Well let's see, you have the choaggie stock TB and Maf to cut off air coming in, and a bigger Choag Cat and Y muffler combo. Roto Rooter...let that kick *** H/C combo shine-support it. Hey man, all fun aside, at least you have Bradenton for a track, which I hear hooks really well. Get some shocks, you will be happy with the performance/ ride over the stock turds. Bottom line, with proper support that car should be a 400rwhp / 11.xx car. I'm not sure if that dyno is wrong, sometimes the truth hurts. Excuses are for the import crowd. Take the challenge.

MannyZ28

iTrader: (1)

Hey man....you talked to my buddies, Dave and Corey that were there at that dyno day. Dave text messaged me and asked for my cam specs and dyno numbers. And yeah, I did 375/367 with the mods in my sig, namely LS6 intake (which you already have since you have an 02), ported TB, TR224 cam, headers with 2.5" catted Y pipe, and going through the full exhaust (B&B Triflo), using a steel (instead of aluminum) driveshaft, onto heavy 315 tires on 11" wheels. The weather was much worse when I dynoed, intake temps were over 100 degrees.

Seeing how Dave dynoed, which was just about on the money considering he's got that shitty Flowmaster exhaust and nothing really else done to the car safe for the lid, I'd say that dyno might read a little low, but not by that much. Your cam is a bit smaller than mine, but the heads should make up for it. Just going by your mods, I thought for sure your car would pull 400RWHP or more!

Anyways...just wanted to add my opinion.

Manny

silverTA2002

iTrader: (1)

HEY! Small world! Yeah, I remember talking to a guy and he text messaged (you I guess) to ask about cam specs.

I think I need to get my A/F dead on, instead of close.

and get a ported TB.

Either way, I'm definitely down on power. It's kinda disappointing. What can you do though.....

98Z28MASS

iTrader: (6)

wow man taht doesnt make a whole lot of sense, you should def see more power. I have the mods in my sig and made 370 rwhp, and im running mac headers and stock 98 heads, which flow like ****. Im with the other guys in the thread, it seems with your combo you should be at least at 380 rwhp with that combo, even with the cats and no pulley and stock tb. Id say its def gotta be in the tune. The lack of a ported TB and pulley wont cause you to be down almost 50 rwhp IMO.

MannyZ28

iTrader: (1)

Yeah it is....Dave called me and told me that you posted here, so I went looking for your thread.

Hope you get your car sorted out. I'll be doing heads next, not sure what to go with though.

'Trust'

iTrader: (24)

Your times do seem consistent to your #'s. What are the rest of the specs on the cam? It seems that it would be around the same size as my 224, and I'm sure your 5.3's would be equivilent to my 241's. And I put the numbers down in the sig through a stalled auto. So you are tuning the car? It seems you have it nailed pretty much, maybe a lil more fuel will help ya. Do you have a graph? If so post it up

Denom

iTrader: (2)

Get your car dyno tuned. It's worth the $450 IMHO. I had one done for $350 on my car and added some 25whp off of it, let alone getting the power throughout all of the powerband.

98Z28MASS

iTrader: (6)

His number might be close if he was running an auto with a huge stall converter and not being able to lock it up on the dyno, but in an m6 thats way too low. I agree, get it professional dyno-tuned if you can and see if that makes up for your lost power.