anotheraznguy

iTrader: (1)

ok guys..

so i have an 04 gto motor

car is a 6 spd w/ the gto trans
rear gear is 3.600
tire size is 265/35/18

motor has
tsunami cam
prc stage 2.5 ls6 heads
1 3/4 long tubes to 3 inch glasspacks to turndowns (no crossover tube)
36 # bosch injectors
4 inch intake

stock intake manifold and throttle body

all dynos were done on a dynopack.
before and after is same location same dyno.
different temperatures though

hp / tq numbers before and after
408 @ 6226 / 378 @ 4908
319 @ 5406 / 344 @ 4152

Just wondering why the low numbers and very peaky tq curve.
any comments / suggestions are greatly appreciated

MM98

iTrader: (13)

90rwhp gain isn't bad at all.. Torque seems kinda low.. Big duration & the bigger intake runners of those heads don't exactly help velocity..Might weld in an x or h-pipe & add a fast 90 to help get the air in & exhaust out.

anotheraznguy

iTrader: (1)

just curios why there is a huge dip in tq as well as how peaky it is compared to one of the other dyno's that was shown.. his tq curve is flat compared to mine.

Sales4@Texas-Speed

iTrader: (4)

It looks to me the exhaust could use some work. But a 90rwhp gain from heads and cam is a pretty substantial gain from where you were at before.

anotheraznguy

iTrader: (1)

john.. how are you guys pulling off 450 w/ pretty much the same setup

BruceBufferTA

iTrader: (1)

Your down on power somewhere. With that said, you aren't the first person to question their dyno numbers with the tsunami cam and 2.5 LS6 heads from TSP. Seems to be something going wrong with these items. A local friend put some stage 2.5 5.3l heads on his car shortly after he installed a 228R cam, they had told him over the phone typical gains were 50rwh with the heads on a m6 full bolt on, cam car. He put down just under 35rwh with a good tune. Hummm...

chrs1313

iTrader: (24)

35 rwhp for those heads sounds about right to me...50 definitely seems like a stretch, unless he was milling them pretty good and running a thinner gasket...

anotheraznguy

iTrader: (1)

anyone can comment on the lack of tq?
did my import chassis infect the v8 to lose tq somewhere?

Pwebbz28

iTrader: (31)

I wouldnt worry too much about the #'s You picked up 90 at the wheels. You can NOT pick up hp without picking up TQ. Go have fun in it.

minytrker

iTrader: (13)

I would be more concerned with the huge dip in the middle vs the peak numbers. Peak numbers arent always everything.

02sslayer

iTrader: (4)

i am running the same H/C setup as you and i made 426rw on a mustang dyno. i was a lil dissapointed i was expecting about 450rw. i had my car dynoed on a dyno =jet when i had boltons and made 341rw. im a lil concerned about my numbers too but i did pick about 1 second in the 1/4 so im pretty happy with everything. but i think i could def benifit from some headwork.

garygnu

what valve springs do you have?did you check the valve train geometry,is the rocker tip centered on the valve tip.what was you timing curve like?a big cam like that is harder to tune.

Jon@Texas-Speed

iTrader: (18)

Looks to me like the car was down on power to begin with. If the car starts out low the final numbers are going to be low. The heads/cam pick up 90 RWHP. I would say that is pretty dang good! The dyno may dyno low or maybe something is going on in the short-block or drivetrain. You might start looking over some other things as well. It would be nice if it was on a bigger scale. It's hard to tell what is really going on with that software.

If you want to make in the 450 RWHP range, throw a FAST 102 intake and TB on there with an UD pulley and swap to some 1 7/8" headers. With the right combo, that those kind of numbers are definitely possible. However, it isn't as simple as throwing on a heads/cam combo as the internet and people in this thread make it sound.

Jon

Jon@Texas-Speed

iTrader: (18)

We don't make up our dyno numbers. If that were the case we wouldn't have the reputation that we have. I'm not going to argue with you about it. I know you don't like us from past deals. But to my knowledge, you don't have any first hand experience with our heads. I don't know your buddy and what he was told but I assure you want he wasn't told false or inflated numbers to make a sale or anything of the sort. If we were doing that, we would have been called on it long ago.

We are pretty open about dyno numbers and we know what our products will do. If you want to see it in person you can come down when we have something on the engine dyno and check it out for yourself.

Jon

MYSTIC-1SC

iTrader: (14)

^Truth.

LS6

Impresive result

Cold Zero

iTrader: (1)

PRC/TSP Haters !! .. it is too late for you to say something wrong about TSP products ! .. they prove themselves many times .. even this GTO pick up 90 rwhp over bolt-ons !..

The Alchemist

iTrader: (19)

Sure you can. Keep the same torque curve and move it 1000 rpm higher and you gain hp but the torque numbers stay the same.

It's simple math, not magic.

Everyone is saying, hey he gained 90rwhp, which is great, but what torque did he gain? 34ft/lbs? That's weak. Torque is cylinder pressure, hp is simply what rpm you have that cylinder pressure, and like I said, you gain hp by moving the torque curve higher in the rpm range.

So honestly, you only gained 30ft/lbs of power, but moved your power range almost 750rpm later, just look at where your peak torque is. That's why you 'gained' horsepower but not much torque.

garygnu

do a leak down or compression check on all cylinders .

06X6spdGTO

iTrader: (6)

how do you have a 3.60 Rear gear GTO?!?! They never made a ring gear/pinon setup for 3.60?? Stock gears are 3.46, then 3.73,3.91,4.10's. If you did the hendrix 8.8 IRS swap you could have 3.55's?! This could be as simple as Bad DATA In = BAD INFO OUT.

If your still on the bone stock 8.75 GTO IRS tell your tuner to put 3.46 into the dyno and get the correct numbers!!