FRiCK

iTrader: (7)

so ive got a C5Z and thought icould benefit from a nice manifold swap, i sourced a good deal on a Vengeance ported FAST 92 with a ported LS2 throttle body, installed them and these were the results...


dyno session 1:
-77* day
-1.120 correction
-118 tractive effort (loaded dyno)
-21* total timing
-462/434


dyno session 2:
-Vengenace ported FAST 92 w/ ported LS2 90mm TB
-91* day
-1.129 correction
-118 tractive effort (loaded dyno)
-23* total timing
-477/438

MODS:

-stock short block
-livernois stage 3 243's milled to 59-60cc
-230/230 .598 .605 111+2
-vararam with duct
-1 3/4" LT's>3" off road X>Ti cat back


The dyno graph shows loses in HP and TQ in multiple places along the pull and the "gains" being 6,200 rpm to redline (6,800).
BEFORE any timing adjustments were made the car was down on power across the board, A/F being between 12.4-12.7 throughout. Im VERY disappointed in these results.

NOW! i get in the car and i want to say it feels stonger, but maybe that just my brain trying to justify this $900 endevaor lol.. last time i was at the track was 2 saturdays ago and it was ~95*, ill be there tomorrow and the weather is calling for very similar conditions, so we shall see tomorrow if i have any REAL gains, if not, this hunk of plastic (as far as im concerned at this point) is for sale!

thoughts???

reeperz28

iTrader: (1)

The temperature difference on the dyno can skew numbers dramatically. It all matter what the 1320 says. It should be a 2-4 mph gain around .2-3 drop in et.

thompson

iTrader: (4)

You increased the size of the runners without increasing the demand from the motor. Bigger is not always better. I'm sure you will be happy with it in the long run, but put more cubes in the bottom end and you will see the difference that will really make you happy. You just need the ability to move more air in order to use a larger intake. Even still 477whp is a very respectable number...

FRiCK

iTrader: (7)

I was under the impression the correction factor would keep things semi consistent.

I thought I wa moving enough air to take advantage of the manifold. I'm also at ~11.5:1 compression.

thunderstruck507

iTrader: (18)

If you didn't dyno on the same day or at least close, the numbers mean jack.

But even then it shows a fairly normal gain in power of 15hp. Not sure what you were expecting?

FRiCK

iTrader: (7)

.....

TransAmcoupe98

iTrader: (10)

This...


Respectable gains and it was much hotter on this dyno run. With it being as hot as it is right now, don't expect miracles at the track either. This heat won't be friendly for your e.t's or traps. Take that into consideration. Ive never heard a legit disappointing story about a FAST "92" that was correctly setup.

R6cowboy

iTrader: (3)

First off, you certainly are moving enough air to take advantage of a bigger intake.

thunderstruck507- with the power numbers he was already making I'm sure he wasn't expecting to be losing HP and TQ in multiple places along the rpm range. As long as he dyno'd on the same dyno the two different outside temps (77* and 91*) shouldn't make a whole lot of difference, the correction factor is there for a reason. Only making decent gains at the peak is not respectable gains, nor fairly normal in this case.

But OP hopefully next time you hit the track you have very similar weather conditions as the last and you pick up some speed to reverse that disappointment. Good luck!

Mike Morris

iTrader: (55)

Hit the track first and see how the car responds. I won't be worried about the numbers

thunderstruck507

iTrader: (18)

Did you confirm there are no vacuum leaks and that the car is getting WOT at the blade?

Did you change the valley cover bolts?

Did you do multiple pulls with the same result?

Blk98Vert

iTrader: (2)

Sounds like there are other issues, you should have gained more

redtail2426

iTrader: (10)

seems about right considering the dyno temp differences.When i went from the stock ls6 intake with ported throttle body to my ported fast 90/90 setup i gained 20rwhp and 17rwtq just fwi

djfury05

iTrader: (30)

Did the tuner even both seeing if it liked more timing? 21-23 seems pretty low to me.

WheelsUp84z

iTrader: (14)

i ran that much timing with a 175 shot of nitrous on pump gas and more compression.... it needs to be up closer to 28*

FRiCK

iTrader: (7)

Just left my tuner. Put the timing back down to 21.5. 23 was pinging pretty hard today in 3rd gear in this 90* heat. You have to remember I'm in California with 91 octane and I'm at damn near 11.5:1.

FRiCK

iTrader: (7)

You have a magical vehicle or are mis-informed. 28*, 175 shot and 91 octane would be a **** show lol

BLWN1

iTrader: (6)

What does this do? New to me, and curious?

intenseblue

iTrader: (1)

He's saying he ran 175 shot with 23 degrees and that the OP who is all motor should be running more than 23

jmilz28

iTrader: (13)

16 degrees ambient air temp will make a very noticeable difference. Each motor is different but timing doesn't seem quite right. Was the A/F adjusted at all? A FULL tune is needed to optimize a FAST install.

reeperz28

iTrader: (1)

Stock style valley cover bolts stick up to high and does not allow the fast 92/102 intakes to seat properly.