dyno numbers don't make sense

[robbie2883]

ok, before i get flamed i'm completely new to this motor and am learning as i go. i feel like such a newb cause i'm just not familiar with this engine yet. i had a chance to toss my ride up on a dyno for free just to get some baseline numbers before i start tinkering with the tune and stuff. boost settles in at .6 bar and creeps up to .8-.9 bar. base fuel is 39 psi and this maxes both the maf and every now and then the injectors out. what confuses me is the dyno numbers and the feel of the car. on the dyno it only put down 183whp/213wtq......this in on the pfc base maps. i looked over the timing maps and they look decent so i'm at a loss. the car pulls, but not as hard as i would think it should. will check timing with a light tomorrow as that's the only thing i can think of. any input or suggestions for other things i should check? these numbers just seem way low to me but again, i'm new to this motor.

mods are as follows

S1 RB25DET Wiseco 8.0:1 Forged PistonsEagle RodsCosworth Rod BearingsCosworth Main BearingsJUN Crank CollarARP Main Engine BoltsARP Head StudsCometic 1.14mm HeadgasketNismo Water PumpNew OEM Oil PumpNew OEM Tensioner PulleyNew OEM Idler PulleyGreddy Timing BeltFully Balanced Rotating AssemblyNismo ThermostatKoyo Performance RadiatorFAL 2500CFM 12inch Dual E-fansDIF E-Fan ControllerApexi Power intakeSyko Performance Intercooler Piping KitGreddy Spec-M IntercoolerGreddy Type-S Blow Off ValveGreddy Intake ManifoldInfiniti Q45 Throttle BodySyko Performance O2 HousingMegan Racing 3-inch Down PipeCat Delete PipeApexi N1 CatbackWalbro 255 Fuel Pump300ZX TT Fuel FilterNismo FPRAeromotive FP GaugeSplitfire Performance CoilpacksSyko Performance Wiring Harness
Modified by robbie2883 at 1:34 PM 5/26/2009

[jey_253]

+1 on checking the timing. My Aem turned out to be improperly timed initially and in result was running 10+ degrees retarded. Makes a night/day difference

[Joe]

is this with the stock turbo?

[robbie2883]

yes, stock t28

[Shocker]

Sounds timing related to me. Maxes your MAF and injectors? No way for MAF, and injectors if you a/f's were like 8.0's WOT maybe at that power level.

Whats your timing at full boost?

Also that CR is kinda low... that is a little less than 8:1 after that HG. Your stock turbo like Joe asked right? With that CR you might need a little larger snail and more boost to make better numbers as well.

Oh yeah you dont have adjustable cam gears do you?

[robbie2883]

Sounds timing related to me. Maxes your MAF and injectors? No way for MAF, and injectors if you a/f's were like 8.0's WOT maybe at that power level.

Whats your timing at full boost?

Also that CR is kinda low... that is a little less than 8:1 after that HG. Your stock turbo like Joe asked right? With that CR you might need a little larger snail and more boost to make better numbers as well.

Oh yeah you dont have adjustable cam gears do you?

i have a gt35 with a 63trim that will go on it eventually . i just wanted to get used to the car, motor and pfc before i did anything. i will have to check the timing at full boost, i just ordered the datalogit kit so all i have to go by right now is the commander. the injectors only max at the 7k rpm range where it goes into the 10's fo afr's.

as for the CR, i got the car with these parts and beggers can't be choosers! LOL just means i can add more timing! LOL

[Joe]

yes, stock t28

ROFL your numbers are fine

you are running a BASE tune for a STOCK rb25 on a fully built one with the stock turbo.

of course its going to have low and s***ty numbers.

your timing is probably off but you arent going to magically gain 50hp from just timing

you need a real tune and the right turbo for your 8:1 compression engine lol

[robbie2883]

while i understand what you're saying and agree to an extent.....the CR does not explain the injectors and maf being maxed out

[eh?]

Something IS wrong somewhere. Your TQ # should not be higher than your HP #. Based on your wheel TQ you should be around 230-240whp. Do you have a dyno graph?

[robbie2883]

*update

sooooo, i haven't been able to get my hands on a timing light yet and i refuse to buy one when i have one at the in laws an hour away! but anyway, i didn't even think about it but on the way home today i adjusted the ign/inj base on the pfc and added 13 degrees overall and it was a WHOLE different car. tried 15 degrees and got some knock so i backed it off. injectors don't max out anymore (87% vs 99%), maf barely doesn't max out and boost holds a rock solid .7 bar. so i'm about 99.99% sure this car is timed wrong.

[mattblancarte]

Please just take your car to a legit tuner and have them take care of it lol.

[robbie2883]

ummmm....considering i know how to tune and what to look/listen for. i think everything is jsut fine. besides that this motor came from a so called "legit" shop and i took it for granite that they set the timing properly. if you read my first post i even stated i figured this was the issue! i think if i can tune a 500+hp 4 cylinder i can handle this!

there is no way ur maxing out a Q45 maf with a stock t28.

u might have a bad maf or something isnt hooked up right

i don't have the q45 maf on there. just the stock r33

[jey_253]

Well good job with the progress man. Another thing I'd add is the type of timing light you have will be critical also because of the wasted spark. Using the FSM method of timing on my Aem made it read twice it's actualy value in high rpms. so make sure to check timing in several spots and get it dead on.

[robbie2883]

so does the power fc run wasted spark? i'm confused, i thought it was still sequential?

[ANVIL]

the pfc basemap is for safety. i dyno'd my car on it and it made about the same hp, forgot about the tq but it was higher than the hp also. this was on my stock rb25det

[Booztd 3]

Man

You can get a timing light at autozone for 30 bucks.......you'll likely wrap up 20 bucks in gas just getting to your in-laws. For 10 bucks more you can have your own timing light to use at your disposal......

[robbie2883]

the timing light is MY timing light and i'm going there this weekend anyway! but i got one, gonna time it in the morning, but i can guaranty it's oof. after logging some stuff today i added just 10 degrees base on the ign/inj temp adjust and it's a whole different car. thanks for the input guys, i'll give a inal update of how far it's off tomorrow.