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

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.

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

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.

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

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.

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

lp

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

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

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.

:iagree:

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

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?

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!!!

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

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.

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.

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

Why are folks in this forum always tripping about dyno numbers. Dynos are nothing more than a tuning tool.

Get that thing on a drag strip and that will tell the tale.

Of how good you're driving skills are... not of how much power the car is making

Indeed but still you wanna see numbers helps show you the improvement

Just a long shot, but maybe check and make sure everything is bolted up properly. Your gains do seem really low with those mods. I could understand if it were just an exhaust upgrade, but something is definately off here.

That thought actually came to my mind, how do I check and make sure of that?

I really do not think his numbers are that off, His bolt on mods before tune should have got him 10-15 WHP and the tune would add about 15WHP more Which would put him right around 300WHP or so,. I made 298 WHP 240 WTQ fully bolted( Stock cats) tuned. Also AT 7 spd..

The guys with the 30HP over stock untuned is what crank HP, No to go off topic but there is no way you got 30 WHP untuned with I/E. Just IMO

So you really think it's a tune issue? Would love to net at least 300 pluse hp

Your baseline numbers 267 hp is consistent for a stock 7AT. I would have guessed 290-300 hp with your mods pretuned.

Did the tech use the same correction factor?

You definitely need a dyno tune so report back when you do.

Correction factor? I really want a dyno tune, but tuners here are not full capable with 370z, as a matter of fact they have not tuned any 370z yet so they don't know wht to expect as of yet and I don't want my car to be the ginne pig for them

Negative ghost rider. MPH in the 1/4 doesn't lie and it's for the most part a pure power number. More power, more MPH.

ET, now that is a gauge of how good a driver you are, especially in a manual trans car.

Ask me how I know.

I do think thats all it is, You would be amazed on what numbers you can see from a tune, Typically 15 WHP but sometimes a little more depending on the car. I'm making really good numbers on my SC kit through my AT :)

Thank you for your encouraging words I just hope that a use will fix this and further more hope that an e-tune will be enough

You could always check for codes even though you don't have a check engine light. My 350 was throwing a knock sensor code but wasnt throwing a cel and that was killing some power for me.

Every Z is different with mods, and the AFR will never just be lean or just rich - it's usually a mixture of both throughout the powerband. Before my tune my car was running really lean in the low-end, high 14s/low 15s. After 3K RPM, the AFR got richer and hit 13s. But after 5K RPM the mixture got pretty rich and was in the 11s and sometimes high 10s. With my current tune, AFRs should be in the lowish-12s across the board.

I'm going to re-log the car and look for timing adjustments that can be made, as well as any possible flat-spots in the AFR (anything outside of the 12 range past 1500RPM, basically).

Edit: Also dynoing nearly a year later negates the purpose of comparing dynos, even if the temp and machine were the same.

There are some things that just don't add up that we already know and I don't think looking at traps will be any benefit. This was on a dynojet with similar weather and temps. If we could see a graph or get you a/f read, this may help. There has been more than a few people who have gained 25-35hp to the wheels tuned and untuned with similar mods. Either the dyno is not reading correctly or it's your car.

Run that tank of gas through and get the highest octane rating you can (91 is the highest there?) from a station that you know to have quality gas.

Then dyno in 5th gear.

I recently filled up with nonamebrand 91 octane from a grocery store to use up our 'gas reward points' :ugh2: Bad idea. My car bogged down off the line and just generally felt unhealthy until I diluted the tank with some 93 octane.

I would go get it dynoed by another company just Because. Yea I would be very upset to you should be making 320 wrhp at least. Something has to be wrong. But next step I would do if I were you is get a tune.

thats why i got so disappointed, but i will do that, get it dynoed at some other place as well as put fuel from a cleaner station before i get it tuned.

1) Drag strip will tell you nothing of power, if i can race a WRX with 300WHP and make the same MPH at the end of the quarter when i'm in a stock 2001 mustang, what does that tell you?

It's all driver and grip levels, remember the stang is RWD and the WRX is AWD.

2) Don't expect much from bolt ons with recent/modern cars, they work their way around the parts as best they can, the tune is what allows them to work.

Get it tuned, you can't whine until then.

i understand that is correct, i will get it tuned next but still expected better numbers at least 290 pre tuned

what is the highest grade of fuel available in your country?

They claim it's 91, but everyone says it's far less than 91 perhaps close to 89

You have to understand that the ECU will not change like the OBDI systems did, so you can't get that kind of increase pre tune. OBDII was brought in to be stricter and make the engine try and get back to the factory state. I understand that these newer versions of OBDII are even more so this way, very hard to change the overall running.

OBDI only adapted to the situation, so an easier breathing filter, it would put in more fuel for example.

ODBII, would see the easier breathing, but try and tune it's self in order that it didn't put more fuel through than it's original design was told.


Basically, you're expecting too much, it won't happen, the tunes are needed these days more than ever because they change the mind of the ECU as to what they should be doing.

I don't think you're expecting too much. +8 hp gain pretune is not normal for the mods you have. I think the problem is the dyno and/or engine.

I think its the dyno I will have it dynoed in an hours time and have numbers posted