Lol... Sorry I wasn't more specific...lol..

But ok to make things clear, I have 20 pentas, and 13w7 with a HUGE custom comp. Box.... Like I've said before my main concern is audio, I just got bit by the performance bug.. Lol... So that's why ill be happy with myself if that's what caused such a low rwhp/rwtq, but I still need a tune bc the car is running lean.. But now I'm thinking maybe I had an exhaust leak... Idk what do u guys think

 

i still think thats well within the margin of error for a N/A 2003 5AT.

That middle drop should go away and the curve should be smoother now. An exhaust leak would just give you more power as the rpms go up and back pressure lessens.

Just get redyno'd and if you still feel sad, get a nitrous kit.

 

tony! ty. i feel alot better now .. lol.. .well i have some stock tires but danm there UGLY...lol... well i do feel better knowing that i caused the car to be slower

i think we all agree i still need a tune

str8dum, nitrous hmmm hmmm idk.....im bound to blow something up

 

done right, nitrous is very safe. tuning is straight forward, unlike a supercharger or turbo. and like 5x cheaper.

 

well this thread couldv been solved way faster if OP would of just said i got HUGE 20s and a sound system. Next time put money in what u want improved. I wanted performance so that is what i attacked 1st. IM SO GLAD ur car isnt a turd

 

2004Black350z,

i agree with you 100%, BUT my intentions when i got the car were just for looks and sound , im not going to lie...i loved the way the z looked and i wanted a hatch for competition, the z was perfect.... i am a audiophile, and i admit im addicted to BASS, that is why i attacked my sound system first before anything, now that i have my sounds at a level where i cant do much more (unless i spend a whole lot of mUla AGAIN) bad enough i started switching from SQ to SPL.... now that the car is payed off i decided to start looking into performance mods, so i was curious to see what i would get on a dyno i was angry by the results... and some members didnt help (u) the situation, they (u) just put gas on the fire.... but i was not aware that 20's lose rwhp on a dyno..... i thought it was just what performance mods you have , so thats why i just put that alone...

so what? we cool now or we still have a grudge ..lol..

 

20s will affect performance, but not really that much.

in a modified car, i've seen upto 30whp loss (going from 20s to 18s), but in a stock form, u might have lost 10whp max.

 

any updates????

 

not yet, im working on a getting a tune and dyno.... most likely at churches (yes i know its #'s are inflated) since there dyno can ELIMINATE ALL guesses of what can hurt #'s... what i mean by that is.. since it will be straight from the hub... there is no excuses of my 20's lost power, my 305 tires lost power, my HEAVY *** sound system lost power... you know what i mean bro.. i want to measure EXACTLY what my engine is making


plus he has tuned and dyno PLENTY of Z's , so chances are hight that he might just have a dyno i can compare with the exact same mods...

 

I just read through this. I know nothing about the auto 350Zs. Do they have a dipstick for the tranny? If so, check it. Have the car running and in park, on level ground. It should be bright red fluid and full on both sides of the stick. Smell it. If it smells burnt, you may have issues. If it's copper or brown/black, you probably need an overhaul.

Have you ever changed the spark plugs? If not, do it. It can't hurt.

Try the ECU resetting procedure. Prior to this, I would clear the ECU by disconnecting the negative battery cable and tapping the brakes.

The ECU resetting procedure/throttle relearn can be found here (last page of the PDF): https://www.motordyneengineering.com/manual.pdf

Prior to any of this, have someone scan your car with an OBD2 scanner. I will almost bet that there is an engine knock code stored. If there is, get a new knock sensor.

 

thanks for the advice

 

So did you end up replacing the torque converter? If you did, take it back to the same place you got the 1st dyno and see if it straightend out some of the spikes.

Keep me posted. I just had my 03 dynoed and it was 228hp with the only mod being colder plugs for nos and a cold air intake.
got 278 with a 50 shot of nitrous but hoping to go bigger Nos jets if I can find out why its running lean.

 

OP, I know you got a different converter, but Edge Racing is great.

I hate short rams...

20's and your intake will do it. Same with your transmission issue.

What stall is the new converter? Also, be sure to get a better tranny cooler b/c a higher stall converter will generate more heat, esp. as it slips around town in low revs.

Did you ever get it dynoed again? I would take it to the exact same place and try to replicate the same conditions. Keep you wheels on etc., and see the difference, at least it'll be comparable in some regards. Also, sometimes they don't put the clip on well when they try to get a signal from the coil wires. Make sure it's secure. If it's not, it'll mess up the readings, and your lines will appear squiggly.

 

thanks for all the input

 

Maybe I am wrong, but while your car is on the dyno they have to clamp onto a wire to get a signal. This has to be a clean connection. They didn't clamp down on my wire securely and it read like 190whp the first run with lines all over the place. They readjusted the clip, and it dynoed perfectly.

The poop charger makes claims on their own website, but meh. Tony even told you to stay away. IMO, anything that exposes the filter to engine bay is not a good intake system for the 350z's. The car already has heat soak issues, and leaving a short ram exposed to even more hot air is counterintuitive. You would def. be better without the intake.

Get a dyno whenever. Your A/F is more important than the numbers, but PLEASE add a another tranny cooler! PLEASE!!!

 

churches had they're dyno's re calibrated and have a new guy running the cthere is a dyno day on facebook one shop is churches idk the other one

https://www.facebook.com/events/5251.../?notif_t=like

 

guess you didnt read the last post date... you revived a three an half year old dead thread....... typical noob move

 

Wow what a fcking dbag. Apologies. I didn't even know I wrote that.