A few months ago I took my stock sedan ( only had a z-tube ) to a dyno and put down 204hp with 202lb-ft of torque. This was followed after a very sad 15.0@92mph run in the 1/4 mile. Keep in mind, I was not exactly estatic.

Fast forward to these past few weeks. I installed ebay $100 headers, ebay $80 testpipes, welded up with a friend of mine a custom 2.5" mandrel bent exhaust using two magnaflow mufflers for about $500-$550, installed a skunk2 spacer that I got for $100 and did the TB coolant bypass mod for free. With these mods my car went from a 15.0@92mph to a 14.3@98mph. Not bad for $800 give or take.

So today I went to the dyno and put down 231whp with 215lb-ft of torque.
Peak power was nearly at redline so it looks like extending the revlimiter might not be a bad idea. A/F ratio was at mid 12's.This was in a different dyno unfortunately so I can't really make a good comparison but the other car than went with me put down LOWER numbers on this dyno so take that however you will.

A lot of people say modding a N/A G35 is not worth it but it sure has been for me.

 

Get an Osiris tune and you'll be hitting 13's or very close to it. Helps to have at least a VLSD to get some traction when you take off.

 

Can't get osiris because I have an early 03 and they don't offer any support for my ecu.

I am working on getting a 3.5FD VLSD for my car though.

 

Oh, that sucks. I think there are some shops that know a workaround to that.

I have 3.5 VLSD on my Sedan. It actually slows you down a little unless if you get taller tires to offset the driveline difference.

BTW, good job on your time

 

Did you use the gaskets that came with the headers?

 

No, I used the stock oem ones. I didn't trust the cheap looking paper/metal ones.

 

Don't buy into the "NA won't make power" mantra. Sure you won't make 400, but you can pick up 40-50whp with full-bolts and a good tune. My car made 239whp stock, and I have picked up 43 so far (still no headers as I haven't see any that are worth it in the power:cost ratio). 231 is pretty solid for an early 03 with those mods and an AT. Good stuff.

 

What mods do you have? 280whp is sick!

 

Ported Jwt Pop (opened up velocity stack to 80mm), z1 3" maf, samco intake tube, MD 5/16 spacer, UR crank pulley, 2.5" TP's, TurboXS Y-pipe & Exhaust, and tuned Osiris by Function Tuned. My car seems abnormal, but I am not going to complain. Currently it is crippled by a dead stock (90K miles) clutch .

 

You might be able to get an Osiris. My car (1st batch of g35coupe to come to US) couldn't get flashed with the Uprev software, so he downloaded something off my car's ECU and sent it to Uprev. The next day they were able to create a ROM that allowed my car to get flashed.

 

Interesting.....but I had thought that the 03 sedans were not compatible because they run off an entirely different ecu. Nissan rushed their production and used the ecu from the previous year maximas (hence the 260hp).

 

Yeah, I'm sure you are right on the history of the ECU as I know nothing about it. Just letting the OP know of the experience I had with Osiris.

By the way, how do you like the 3" MAF?

 

I would say aside from the Osiris it has actually netted the best gains. I picked up 12ish whp from the swap over to the 3" maf and intake tube along with a quick retune. The car will essentially not run unless tuned for the larger maf housing. Makes it a bit of a pain, but for the price it is a great mod. It can be a bit more costly if your tuner hasn't tuned one on an NA car prior because he has to build a tune and kind of use you as guinea pig, but for me it took less than 30 mins to get a tune for it.

What kind of numbers are you putting down with your set-up now gabe3d?

 

I just have my Tomei stuff (headers and cams) laying around waiting to be installed, but everything else in my sigs are in the car already. If i put my stock stock 18" then I'm putting down 250whp on a mustang. My baseline is 209whp plain stock and a stock 370z pulled 237whp on the same dyno. Just so that you can gauge a little, since all dynos are completely different, even same models from shop to shop.

I'm basically building my car with all the possible NA boltons, then later on I will put in a supercharger. I did this as a learning experience and to see what kind of gains come from each of these. The only thing that will not be transferred over once I put in a supercharger will be air intake.

When you said you gained 12whp from the 3" MAF with a quick retune you mean a quick fuel correction right? Looks like you might have peaked my interest in something new.... Gotta stop surfing the net...

 

Yea...the ignition settings were kept the same...just needed to add some fuel. I am thinking of getting the tomei V2's, but I am holding out for an independent dyno. Hurry up and dyno that thing . Ultimately I want to crack 300whp on a dynojet with the stock DE cams, but I don't think anyone has done it before. The dynodynamics I get tuned on reads very low as well. Most HR's only make about 238-243 and I put down 262 on there. For the price (120 shipped for the housing and 120 for the intake tube) you really can't beat the performance to dollar ratio of the maf housing.