Very disappointing low dyno numbers please help!!!!!!!

zuperman 370

Hello fellow forum members so today I went to get my car dynoed, before I tell you guys what happened I'll start of by telling you about my base numbers and my car, I have an AT 2009, I dynoed it when it was bone stock last year using a dyno jet, the numbers that I got where 266.91hp and 227.72tq and the car was very rich from the factory, now our fuel isn't the best quality they claim it's 91 but everyone says that it's less, so that's why I assumed that I got lower numbers when comparing to other 370's.

Exactly one year to the day, I got my car dynoed again on the same dyno jet that I dynoed my car on, same time of year same weather conditions and the car was cooled down and everything, the mods that I have are follows, amuse stti exhaust motordyne xyz pipe resonated, F.I long tube headers, top secret intake, of course the car is not tuned yet, I was hoping for at least 280-290 hp, well when I dynoed it I was extremely shocked to say the least, numbers were 274.05hp and 233.31tq, and the AFR was a tiny bit richer with these mods on. So with these mods I got a 8hp increase and 6tq increase :s of course at this point I was furious, a lot of thoughts went through my head I though ok maybe the guys dyno is screwed up and gave me low numbers, but even though that was the case, I had the old numbers from last year to compare with so even if his dyno is screwed well I can compare it to the last time. Another though was that I might need a tune, but gains that I will get from a tune are 10-15 hp, so that will leave me at almost 290 ish, and that's if I'm lucky enough, which is still disappointing given the mods that I have, I'm really lost guys and don't know what the problem might me or why I got these extremely low disappointing numbers, I have seen cars on this forum get 277 bone stock, please every one chime in, tuners non tuners plz I need ever ones advice on this, I'm going to get the jun cams now, but after seeing those numbers I feel so upset that I don't even know if I'll get them now, what could be the problem.

P.S I got these two dyno readings in the 4th gear, pleeeeeeease advise me on what the problem might be, any input at all could help me.

P.P.S weather condition was really good, very low humidity and nice cool breezy weather of 20c.

TerribleONE

Your car has to be running leaner with these mods, not richer.. Also remember every dyno is different and even though it was the same time of the year that does not gaurantee that the weather was identicle. You should of definitely picked up some more power than that though.. Maybe someone else with a similar set up can chime in. Also, I would hold off on the cams until we know more about them

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zuperman 370

The dyno showed that it was actually funking a bit richer, even a friend of mine read it when he installed the mods and told me that it's ok it's a bit richer so I don't have to worry I can drive the car around for a bit till I get it tuned even if the weather conditions went identical which I know they went I should of gotten much better numbers at least 290 ish without tune, I'm extremely disappointed and really not liking my car right now.

sixpax

...maybe the dyno is waiting for those JUN cams to get installed before it records a massive increase to 350 or so ?

really no way to know what you will get from the tune until you actually get it done. perhaps it will be a bigger bump than you would anticipate. your numbers do seem low considering what you have ... some very nice mods indeed. might as well get it tuned ... bet you will be surprised.

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lpsscc

I wouldn't worry or chase numbers until the car was tuned...

lp

edub370

I don't understand how you are running rich without a tune with these mods. seems almost impossible

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zuperman 370

But dosnt tune give only 15 max at least that's the average that I see

theDreamer

Eh, cannot look at it that way.
A tune is designed more to get your car running properly after modifications, fix the A/F, timing usually, throttle response, etc. The power gains are an offset of this by making the car more efficient with the mods you have. I would suggest getting the tune and report back.

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sixpax

Mine was actually running rather crappy, and my AFRs were all messed up until I got the tune.

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zuperman 370

Seems like this is the smartest thing to do about now, will an e-tune be enough since our tuners here are not capable at all and have no idea what uprev is, and you guys think I should hold out on the cams?

fuct

i dont understand why you are tripping out. you havnt tuned it yet. do that then see your results. you have changed alot with your mods, so a tune is DEF needed!!!

zuperman 370

Yeh you guys r right defently a tune isin need, will an e-tune be enough to get the gains out of these mods?

theDreamer

An e-tune will help, but I would suggest a dyno tune.
Is there anyone around that knows tuning at all, not just using uprev? If so, they should be able to use Uprev they just need the software/license and a little time to learn the interface.

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SS_Firehawk

You should have definitely gained more than that. I run a similar setup and I gained about 30hp over my baseline untuned. I would definitely look at your fuel as well. Is your SES light on? Sometimes when that kicks on, it runs richer. what elevation are you at btw? You could try and run it on another dynojet to see if the numbers are in the same ballpark. From the dyno's that I've done, 4th and 5th gear pulls don't make much of a difference, if any. I like 4th because it preserves my tranny.

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zuperman 370

Tuners here are not that capable and I don't trust them to mess around till they figure it out but as fire hawk said he gained 30hp untuned while I gained 7 only