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My First Dyno Run

tek_01

By tek_01,
in Engines & Forced Induction

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tek_01 Proficient

tek_01

Posted
Posted

hey fellas just went and got on the dyno for the first time to see how my car is performing asi had suspicions it was a tad slower than other standard skylines

mods so far are turbo back kakimoto exhaust, atmo BOV, thats pretty much it for engine wise

my first run was 132rwkw which was a bit low hence why my car didnt feel very quick compared to others

after a few more runs which were pretty equal we put a nismo fpr on and also the turbotech boost controller... ths is where the problems began

at stock boost it was ok almost the same as before but as soon as we ran a bit more boost it (as little as 9-10psi) will have a bad power curve like the ecu is retarding/lowering boost or something to that extent and was much lower power than stock

pretty much all we tried turned out bad so ended up putting the boost back on 8psi with the turbotech (122rwkw this time, lost 10kw from stock although the day did get hotter by about 5 degrees is that makes any difference)

am i going into rich and retard mode or something like that? the mechanic didnt have too much experience with r33s so he didnt have much more of an idea

here is a picture of the dyno results (green line = stock, red = with fpr and boost controller, black is running about 10-11psi)

someone help please!! lol what can i do? is the only option an aftermarket computer?

dyno1.jpg

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tmc_2 Rising Star

tmc_2

Posted
Posted

Was any thing done to tune your car?

I made 202 rwkw(270.9rwhp) with 10psi , pod filter , dump back exhaust, stock ecu stock turbo, walbro fuel pump, FMIC

My previous r33 dead stock did 201rwhp wiht stock airbox etc and its power curve didnt look as ruff as ur one??

tek_01 Proficient

tek_01

Posted
  • Author
Posted

fpr is brand new nismo item, so im pretty sure its good unless it came faulty from factory

im using standard airbox atm until my cai setup arrives..

we played around with the timing but only got worse results

its like as soon as it hit about 110kw it just shits itself, with higher boost its MUCH more of a dip, dips down to about 70kw

any way i can check afm ? my other mechanic put his computer on it and only error was the HICAS was getting no signal all other sensors were fine

QRI05E Mentor

QRI05E

Posted
Posted

My SII R33 pulled 144rw/kw stock as a rock (7psi) then 165rw/kw with full exhaust (7psi) so theoretically at 10psi i should be looking closer to 175rw/kw.

Your dyno graph looks all over the shop once it hits full boost. My car had a simillar dip at 5000rpm due to misfiring coils and now that its fixed its smooth to redline... can you feel those power dips on the road? and misfiring/hesitation? Spark gap may be too big and the boost is blowing out the spark.. try 0.8mm gap... check coils...

Hope all goes well dude!

Regards,

Sarkis

tmc_2 Rising Star

tmc_2

Posted
Posted
My SII R33 pulled 144rw/kw stock as a rock (7psi) then 165rw/kw with full exhaust (7psi) so theoretically at 10psi i should be looking closer to 175rw/kw.

Your dyno graph looks all over the shop once it hits full boost. My car had a simillar dip at 5000rpm due to misfiring coils and now that its fixed its smooth to redline... can you feel those power dips on the road? and misfiring/hesitation? Spark gap may be too big and the boost is blowing out the spark.. try 0.8mm gap... check coils...

Hope all goes well dude!

Regards,

Sarkis

Coils could be likley, does it misfire? u probly cant hear the misfire with stock muffler.

Yeah air fuel seems rich? correct me if im wrong too?

tek_01 Proficient

tek_01

Posted
  • Author
Posted

yeah it is rich it should be around 12 or something, but i cant do nothing about that until i get a computer right?

the spark plugs are gapped at 1.0mm just changed them a week aggo with platinums. the coils seemed ok but never looked at them 100%.

there sometimes seem to be a little flatspot and then it kicks on again , it doesnt backfire only sometime on the shifting of gears but not very loud

Coils could be likley, does it misfire? u probly cant hear the misfire with stock muffler.

Yeah air fuel seems rich? correct me if im wrong too?

benl1981 Grand Master

benl1981

Posted
Posted

See if you can borrow a PFC and see if that makes it feel better (maybe through it on the dyno)

You shouldn't need a Nismo FPR - that is just adding another variable.. you would usually use this to richen things up by adding extra fuel pressure (I..e when nearly maxing out injectors)

You are most likely hitting R&R..but the curve is very wobbly.

Kennedy Mentor

Kennedy

Posted
Posted
Was any thing done to tune your car?

I made 202 rwkw(270.9rwhp) with 10psi , pod filter , dump back exhaust, stock ecu stock turbo, walbro fuel pump, FMIC

My previous r33 dead stock did 201rwhp wiht stock airbox etc and its power curve didnt look as ruff as ur one??

Very happy dyno :D

180bfj20det Community Regular

180bfj20det

Posted
Posted (edited)

Looks like rich and retard....but at a low boost, got me stuffed but im no expert.

Lose the BOV and boost controller and FPR for now. Then put the car back on the dyno and ofcourse as suggested gap the plugs to 0.8. I think your problems will go away.

But youre running less than 10 afr (the graph shows 10 but i think it has gone below and simply reads the minimum on the graph which is 10) which is no good. You lose a lot power at 10afr...well I know I did.

Interested to see how this goes.

Edited by 180bfj20det
benl1981 Grand Master

benl1981

Posted
Posted

Please take that FPR and atmo venting BOV off.. and leave them off

There is no way on a stock ecu that you want to increase the Fuel Pressure unless something else is not functioning properly(e.g. fuel pump).

Everyone knows they run rich when on boost and also can go into rich and retard mode. Addiing more fuel rail pressure means this is even more pronounced...

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