My Bro's S14 Dynoed.... Now Crappy

[blackprincegts]

Hey all..

My brother has a 97 s2 s14. He had it dynoed stock andit made 128rwks.. then he removed the boost restrictor to take it to 10psi and wacked on a pod andit made 137rwks or something thereabouts.. At this point the car ran real nice.. the power curve was just right i think. Within the last 2weeks his had a highflow lowmount manifold, 3inch highflow cat, dump and 3inch mandrel etc... All te normal exhaust mods. Its still running the stock side mount cooler but that will change soon.

Anyway he hadit dynoed again today after all the mods.. It hit 146.3rwkw's at about 5000rpm then the power drops off hardkore down to below 130 i think.. Looking at the chart the afr's go extremely rich up top. the graph only goes down to 10 and the red line sits on that pretty much the whole time above 5grand.

He rekns that his stock ecu should be able to handle the mods easily because his seen plently of other s14's run 170od rwkw's on stock tune.

My feeling is that his ecu is simply dumping in to much fuel and cutting the power, but the dyno operator rekns that somethings screwed onit, like the crank angle or knock sensor.

Any input into this would be much appreciated because his pretty pissed off with the results.Hopefully ill be getting him to scan the charts and post them up here 2moro to give you guys a better indication of whats going on.

Cheers guys!

Edited February 2, 2007 by blackprincegts

[WazR32GTSt]

sounds like a stock nissan ECU to me...

my AFRs were about 10.5:1 before i had my ECU tuned

what others get on different dynos at different times isn't really comparible to what your brother got. dyno's are for comparing before and after, not for comparing between different dynos on different days etc.

[blackprincegts]

yeah i agree about the dyno results thing.. I was more so meaning that all the other s14's ecu's seemed to handle the same mods without cutting the power back like what my brothers has. Not so much the actual KW readings.

thats why he rekns it musnt be due to the rich afr's..

[32vspecII]

theres a lot of variables in the adaptive ecu logic , lots of cars are all a bit different in they way they react and when they will start to react to rich and retard due to the mods and more airflow

it could be sensor related so check the stock ecu for error codes

i would still tune the ecu now to the turbo/fuel system limt and see what happens so you know all your afrs and timing is right and if you still have the problem you know its not ecu and something else . its not a bad time for a tune now anyway to take advantage of what youve done so far

Edited February 2, 2007 by arkon

[Link]

Sounds like it needs a fuel pump, bigger injectors and a ecu - it should hit 200kw+ atw then

[blackprincegts]

theres a lot of variables in the adaptive ecu logic , lots of cars are all a bit different in they way they react and when they will start to react to rich and retard due to the mods and more airflow

it could be sensor related so check the stock ecu for error codes

i would still tune the ecu now to the turbo/fuel system limt and see happens so you know all your afrs and timing it right and if you still have the problem you know its not ecu and something else . its not a bad time for a tune now anyway to take advantage of what youve done so far

yeah i did say to him that i would guess that his car would make another 20rwkws or so being tuned anyway.

Il get him to check the ecu diagnostics. good idea.

i think the problem he was saying is that unlike the r32 etc he cant just go getit chipped for a hundred bux or something.. he's gunna be up for atleast $600 atleast i think.

[blackprincegts]

oh and btw, his aim was around 170 at the rears with these mods. Eventually he sed he might chase more but i must say its pretty damn quick as it is.

[QRI05E]

my mates S2 S14 has 185rw/kw with:

- Full 3" exhaust

- FMIC

- EBC (set on 14 psi)

- Halteck E6X ECU

- Walbro intank pump

- Nismo FPR

- Stock Injectors

- Stock Turbo

- Stock manifold

SR20's need 3 main key Mods to go hard... Exhaust, ECU & Boost.. this was told by his tuner

Hope this helps...

Cheers

Edited February 2, 2007 by QRI05E

[GeeTR]

theres a lot of variables in the adaptive ecu logic , lots of cars are all a bit different in they way they react and when they will start to react to rich and retard due to the mods and more airflow

it could be sensor related so check the stock ecu for error codes

i would still tune the ecu now to the turbo/fuel system limt and see happens so you know all your afrs and timing it right and if you still have the problem you know its not ecu and something else . its not a bad time for a tune now anyway to take advantage of what youve done so far

Good advice, i would think HARD R&R would account for a LOT of power loss. ECU is doing all the work, would think this is the first consideration before doing a lot of mods. I saw a stockish S14 on NS.com making 187rwkw with your mods.

Good luck bro

- M

[SirRacer]

an s14 is my daily driver car so i know a thing or 2 about them

mine has 187rwkws with exhaust, filter, intercooler, de throttle body and computer with injectors, nothing else

fuel pump is fine to 200kws. the stock injectors start to play up around the 170rwkw mark and learn the engine out. my car hated the boost restrictor being removed so i put it back in.

what were the afr's?

based on what you have said it should be fine. swap the ecu for another cars one and try that

[32vspecII]

yeah i did say to him that i would guess that his car would make another 20rwkws or so being tuned anyway.

Il get him to check the ecu diagnostics. good idea.

i think the problem he was saying is that unlike the r32 etc he cant just go getit chipped for a hundred bux or something.. he's gunna be up for atleast $600 atleast i think.

you can get a daughter board or go powerfc on the cheapest end of things

2nd hand powerfc and basic clean up tune would be good

sooner or later youll have to do the ecu to go further , sooner is always better

[Risking]

SR20's need 3 main key Mods to go hard... Exhaust, ECU & Boost.. this was told by his tuner

SR's need more than that. The injectors call it a day at 160-170Kw, MAF sensor is out by 180Kw, Inlet temps fry with more than stock boost and the fuel pump is out of its leauge.

If you want to make an easy 200Kw from an SR use a power FC, nismo 550's, walbro pump, Z32 MAF along with the usual cooler and exhaust etc. If you adventurous a pair of Step 1 264/264's or pon cams would seal the deal.

Exhaus, ECU boost will not make an SR go hard it will make an SR go bang.

[SirRacer]

SR's need more than that. The injectors call it a day at 160-170Kw, MAF sensor is out by 180Kw, Inlet temps fry with more than stock boost and the fuel pump is out of its leauge.

If you want to make an easy 200Kw from an SR use a power FC, nismo 550's, walbro pump, Z32 MAF along with the usual cooler and exhaust etc. If you adventurous a pair of Step 1 264/264's or pon cams would seal the deal.

Exhaus, ECU boost will not make an SR go hard it will make an SR go bang.

maybe read my post about 2 above then go back to finding out some real information

car has been running like that for the last 2 and a half years

[Busky2k]

SR's need more than that. The injectors call it a day at 160-170Kw, MAF sensor is out by 180Kw, Inlet temps fry with more than stock boost and the fuel pump is out of its leauge.

I had 195rwkw on my old S14 with the stock injectors and MAF. The MAF had plenty more to go. It can probably read 250rwkw of air judging by the voltage headroom. But it sucks because its so small.

Anyways the stock ECU is your biggest enemy in the S14 - it R&Rs something chronic when pushed so its best to bin it for something. Its not hard to get 190+ rwkw out on an S14 SR with the stock turbo. Just smart mods.

[Risking]

The only things extra I have suggested he do are the MAF sensor and fuel pump. I havent said you NEED cams I said they are nice to have.

Ive built and tunned hundreds of SR's and from mine and others experiance thats a basic guideline to making power from one.

I know of an SR that made 195Kw with stock injectors, pump and MAF. Freak of an engine all it had really was cams and a daugter board tune!

Edited February 2, 2007 by Risking

[R31Nismoid]

Anyway he hadit dynoed again today after all the mods.. It hit 146.3rwkw's at about 5000rpm then the power drops off hardkore down to below 130 i think.. Looking at the chart the afr's go extremely rich up top. the graph only goes down to 10 and the red line sits on that pretty much the whole time above 5grand.

He rekns that his stock ecu should be able to handle the mods easily because his seen plently of other s14's run 170od rwkw's on stock tune.

Thats the ECU

The S15 im driving around in on/off at the moment is exactly the same.

Its ok as it ramps up onto boost, but then bogs down around 4500-5000rpm and does nothing. Might aswell change a gear.

And thats not on heavy throttle either.

An ECU will sort that out as it wont be the fuel pump if the AFR's and going rich.

[R-PWR]

Definetly the ECU, here comes PFC

[mad082]

my mate ran 16psi through his s13 and never hit r&r. i really doubt that with a touch more boost and exhaust you would be hitting it. sr20's will usually handle 15psi without a worry, and thats with a fmic as well.

i'd suggest putting a safc on it (if he doesn't want to pay for a whole ecu) and see if they can lean it out using that.

but i think the tuner might be heading in the right direction with the crank angle sensor. my mate had a faulty CAS and it made it run like crap. it ran rich as anything.

also be worth checking the water temp sensor.

[Adriano]

Grom running heaps up on the dyno, i think that the r & r on the s14's is a bit harsher than the s13's, similar to the r33 to r34, they just built in more protection. 170rwkw sounds about right for your mods, just need the management fixed, you can get it chipped, replace it or an safc may do the job. Also sr20's are renown for stuffing cam angle sensors.

[nissanmanS12]

Hey guys,

Yea it made with STOCK exhaust and with pod filter and FBU 11psi... 141rwkw.. thats healthy, and stok as rock 129rwkw with a pod lol.

I was hoping for about 160-165... thats pretty good for mods i have, considering i have a manifold also.

The car still pulls hard thru gears, dusnt seem like on the road the power drops off, but i havnt had the chance to take it into the 5,000rpm plus range in 4th yet to see wat it dus but.

Ill post up Dyno sheet soon,

After each run the power drop off seemd to get worse! First of all it dropped off, then 2nd time we tryed it agen it dropped off quiker and more! 3rd time they stopped cas i didnt want to go for anuda run.