im surprised no one has said this yet...you're in essentially saudi arabia am i right? your temperatures will play a HUGE role. as well as the octane standards. as far as i know, saudia arabia, and most of the world uses a "RON" (research octane number) octane rating. the USA on the other hand uses an "AKI" (anti knock index).

a quick google search turns up our 91 in the USA is equivalent to the posted "95" octane in the rest of the world. which could very well explain your power differences. as well as the low humidity/high heat in that part of the region. but back to the octane ratings, it seems you're essentially putting in what us americans know as "87" into your Z. hence the lowered power ratings.

edit: wikipedia'd it:

Chops couldn't of said it any better, I had in mind the lower gains were due to the lower fuel rating in Bahrain but with regards o the weather it is good this tine of year and that's why I opted to get it dynoed.

On a brighter note I got the car dynoed on a different dyno tonight and got more realistic numbers, this is of course pre tuned numbers, I'm hoping to get around 300 hp tuned, the numbers that I got are as follows 286 hp and 251tq, so I am a bit happier now, I'm hoping for around 300 tuned, do you guys think I van achieve that or am I expecting too much? What do you guys think is a realistic number for me after tune, and instalation of jun cams, dare I say 320hp ?

Not to hi-jack but I love Bahrain... Just sayin!

Heading that way in a month or so. Gold souq here I come!

lp

Loool your more than welcome, u coming over for the F1 race?

make sure to run it empty on the 91. get some 95 in there!!

It's ok having it dyno'd but that won't change it's state of tune...


And yes, you're going to get lower numbers and maybe cause problems with having such low octane fuel.

Definitely get some Mumtaz in the Z and tune ASAP.

When do you think the exhaust cams will be installed?

Why do people get so hung up about numbers. The real issue should be the change from one mod to the next. That tells a truer story.

It's not that we are stuck on numbers, for what was installed, the numbers did not look right. I believe the mods were installed at the same time. It is difficult to discern the difference between stock and boltons without a dyno or looking at traps. Both still need to be done in near identical conditions to get accurate comparisons. I think the OP did the right thing asking the forum for help and weighing the options. Even in an untuned state, a 6 HP increase is less than drop ins. OBDI or OBDII, it doesn't matter in this case, the measured gains were so small, it was not the norm.

Nope, I'm heading to the base for work but I might have to check the race out if I'm in town that day!

lp

Thanks guys for all of your help, i only put mumtaz in my car, which is the highest grade of fuel in Bahrain, but still not good enough, the cams will be installed ASAP, just waiting for the invoice to be sent to me so that i can go ahead with the payment for them, up next cams and tune and hopefully we will be seeing better numbers.

Adnan 286 rwhp 370z on dyno video 1

Adnan 286 rwhp 370z on dyno video 2

Car sounds and looks great!

thank you very much, tune and cams up next :D

Those intakes probably introduce too much turbulence to the MAF sensors, causing misreads. Either toss them for stock + high flow filters or the stillen G3's and retune.

Also, keep in mind that even with SAE correction, if the ambient temps were radically different during each time you dynoed, that will throw things off quite a bit.

As to the octane issue -- run 95 RON and you will be fine.

I'm afraid I spent way to much and love these intakes way more to just throw them aside loool isn't there another way to perhaps fix this MAF sensors issue if there is one that is, without having to change my current intake setup?

As for fuel I'm afraid that 91 is the highest grade that we have here :(

It depends. If it's a constant misread then yes, with tuning. If it's a random intermittent misread then you'll have to experiment...

Does the location of the MAF sensors change from stock? That alone could be the cause, and if so, it should be a constant error that can be fixed with tuning.

Another possiblity is the filters -- if they use the HKS style "mushroom" foam filters, I'd swap them out for larger ones made of oiled cotton (e.g., K&N) or dry synthetic (e.g., AEM).

If the 91 is AKI (RON+MON/2) then you are fine. If it's 91 RON, that is basically 87 AKI (i.e., "regular" unleaded), which is too low an octane for the Z.

My car untuned put down 308.27 with just cai and cbe and i got it tuned and now im making 313.56 so i t is very possible. U just need quality parts and quality hands to install them. Without that u wont see the results u want.

Any update on this?

I think that i may have found the problem, the MAF readings were messed up, you see the MAF sensor usually is facing up, like the oem setup and any other aftermarket intake setup, but my maf sensors were facing the side, i was even feeling it in the response of the car when driving as it was extremy slow to respond. Problem fixed, installed brackets and intake has been adjusted, MAF sensors adjusted to now they are facing the right direction, havent dynoed the car yet but i am feeling the difference, also the PVC hoses were extermly bent, restricting the air flow, but now that also has been adjusted. Now question is do these factors make a difference in dyno numbers, so if i got 286 with the screwed up setup, could i possibly get 290 ish on the adjusted setup, i would be more than happy with 290 untuned, and 300ish tuned

Yep -- like I thought.

Yes -- you shouldl see a big gain in power with MAF's that are metering air correctly ;)

You can try to add a fuel additive to increase the octane of you gas and see if that helps. How much does it cost you per gallon of fuel?

Good luck and your car still looks great!