Max240sx

I don't own a Maxima, although I know someone can help me since I do have a 03' Maxima engine in my car.

My car is a 93' 240sx with a VQ35DE from an 03 Maxima. (using the maxima ecu)

For some reason I have the same power/tq as what a stock Maxima has and it's bothering me to hell since I'm boosted. The car builds boost just fine also.

My car currently has 216whp/246tq @ 98F w/ 55% humidity on a DynoJet. (I know i can get a nice amount from weather change, but not enough to explain the low power)

I'm still running off a stock header on the passenger side, but I'm not sure how much of a difference that would make.

Here's the mod list I'm working with:


VQ35DE swapped (2003 Maxima heads on 350Z block)
350Z 6-speed Transmission
Godspeed T60 Turbo
Godspeed Intercooler
Mishimoto Radiator
Fuel Pressure Regulator
Walbro 255lph Fuel Pump
Deatschwerks 550cc Injectors
Blitz DD BOV
Custom intake Plenum
Apexi AFC Neo
Full 3'' Exhaust w/ 2.5in V-Band downpipe
AEM Wideband
Misc oil cooler
Nismo low temp thermostat

Picture of the motor

https://i.imgur.com/CuLsY.jpg

Any help would be great.

ChrisMan287

iTrader: (34)

How many pounds of boost are you pushing?

ranmas2004

iTrader: (2)

get rid of that 2.5" DP...choking the car. BUT thats not the problem....no matter WHAt you running...even if you only ran 4psi you should be over 300whp. It could be TONS of different things wrong with your setup. For someone to try to gues what is wrong with just the info you gave is near impossible.

Max240sx

This is true, and it's pretty difficult to come up with what could possibly be the issue. I'm also curious if the design of the intake manifold is even beneficial. Maybe there's some part of the system that's starving fuel, I might have to ask the tuner to see if there was any issues. There might be a few components I'm missing but from my understanding the stock fuel rail should've been fine.

I'm usually hovering around 7-8psi of boost with full spool @ 5k.

MaximaSpd85

iTrader: (14)

Wow the engine looks so weird lol. So youre using an 03 maxima ecu? With the full harness? Forgive me, i just dont know how these swaps work in 240s. Are those 3.0 timing covers? That gets rid of the variable timing? Do those ecus go into some kind of limp mode without them?

Anyways, do you have a dyno sheet or runfiles? Maybe try the maxima or 350z intake manifold. I just asked a crapload of questions lol.

Nealoc187

iTrader: (23)

what's the dyno look like?

ranmas2004

iTrader: (2)

this is important......

Max240sx

1. Yes on the maxima ecu
2. Second part I'm not sure exactly, I might end up dissecting the engine to find out more.

The dyno shows a steady powerband, no hiccups anywhere. If I switch over to a 350z/maxima manifold then I'd have to redue the entire plumbing since it'll face the opposite direction.

*edit*

After doing a lot of researching, I've come to the conclusion of something that might be the case. (This is just a guess, I'd like to check for certain myself but my car is in storage back home in St. Louis. Under military circumstances, I'm not exactly home to find out sadly.)

1. It's running a VQ35 block with VQ30 heads, although the power should actually be really high with the high compression although the tuner might've adjusted the power greatly since they had issues with knock. This is highly possible and the car wasn't boosted at the start so the original owner probably had the plans of just keeping it a N/A monster when I was well unaware. So boosting was a bad idea. If this is the case, I might either switch the heads back to a vq35 along with the pulley covers but tuning might be an issue. Or I can just remove the turbo system all together and keep it N/A.

streetzlegend

iTrader: (8)

You are using a full 2003 maxima harness, but are using 3.0 timing and head? That combination alone will screw up power in my opinion. if you have a 3.5 ECU, you should be using 3.5 timing (so the ECU can control the variable cams). You definitly should ditch the 3.0 heads, put 3.5 heads along with 3.5 timing, i guarantee you'll gain 50% more power.

shrek

first of all, you are using a vq30 ECU, i think VQ30 heads(which will give high C.R.),Ebay turbo,2.5 DP,using 550 injectors and "tuning" wih only an AFC i dont want to be rude but i see lots of wrong stuff


I have a VQ30 with VQ30 ECU ,Z33 tranny and manifold heres a pic http://sphotos-a.ak.fbcdn.net/hphoto...12961948_n.jpg

036mtmax

iTrader: (11)

There has to be more to the story that were not getting, That car is making alot less power then most 5/5"s do bolted and untuned. Like Ranmas said even if that turbo was only making the slightest bit of boost the numbers would be significantly larger. How does the car run ? Breaking up at all, misfires etc.

Max240sx

In 1st/2nd, the fuel cuts off at high rpms (Generally 5k+)

Usually then the afr goes 10:1 and lower.

t6378tp

iTrader: (69)

There is so many issues and misinformation that needs to be cleared up. From the pic you have a 3.5 bottom with 3.0 top and timing along with a 4gen maf so my guess is he is using a 4gen harness and ecu but doesn't know it. 2nd that doesn't look like a t60 and closer to a t28 or something slightly bigger but not a t60. 3rd the a/f is way way to rich if it's off the chart, also what's your base fuel psi. Last do you know if the timing was set right, hg is sealed and if you have any boost leaks