Brezza

exhaust is on, havent had a chance to dyno it yet. hopefully get back early next week with some evidence.

OK the 4in cat back is on! going to hopefully drop the GTR off at the tuner tonight. it might get onto the dyno early next week! first thoughts of the 4in exhaust is its quieter. for some reason the car feels a little off. it doesnt go as hard as i remember. it feels like the tune is slightly off? hopefully with some tweaks to the tune it will be much better.

Damn Cams are taking their sweet time! its doubtful i'll get the damn things delivered and in the car before xmas.

HAHA we'll just wait and see hopefully no BOOM!!

cheers mate! yeah, i'm looking forward to the results too. it shouldnt take too long to tickle the tune to suit the extra flow from the exhaust. i'm lucky that my tuner doesnt charge me heaps for dyno time, cos at the end of the day he can find out what works well too. i think the exhaust might help the turbo's spool up earlier, but will mainly show a gain in top end. realistically i think the exhaust might get me 370-380kw and maybe the cams might pull a little more? but who knows? i'm not sure how my turbo's will go with the extra flow? i am getting a little puff of smoke after boosting it. its looking like turbo seals

I'm not planning on putting more boost into it. i'm wanting to keep high boost around the 24-25psi mark. i dont really want to go blasting 2 bar through -5's the std springs should be fine, there are plenty of people using these cams with std springs. the ramp rate is supposed to be fairly std spring friendly. at the end of the day, they're still a mild cam.

High flow Cat SOLD! Bump for 3in cat back

i think most of the time, the std springs are fine for poncams. they're usually needed for high lift cams. 10mm or more? correct me if i'm wrong.

The muffler that is going on will be 4in internal diameter. its going to be made up, not some off the shelf item. i'm really curious to how it will sound with a bigger exhaust too. the 3in sounds like its full when at WOT. fingers crossed for some good gains!

i've got twin walbro in tank pumps it is a similar system to what powertune is offering. my tuner has made up a bracket that slots into the standard cradle and holds both pumps. the fuel tank lid had to be tapped with a new fitting and a separate line was run out of the tank. the tuner used the std return line as the second feed, and bent up a new line from some tubing to make a new return line. theory was that the return line wouldn't be under pressure like the feeder lines so it doesnt need to be as strong. the two lines merge into one larger line in the engine bay and the tuner welded a new thicker feed into the rail. i'm still using one entry in the rail, and std fuel reg. all works fine now. all the wiring for the pumps had to be redone as the old one was stuffed and caused all sorts of issues. have done 2 track days on e85 and it's been running for quite a while now with no issues. and the pumps aren't noisy. apparently the bosch pumps make more noise than the walbro's. for anyone looking at doing the same, go for the walbro's, because you will struggle to fit 2 bosch pumps in the cradle.

UPDATE: i have the car booked in for a 4in cat back system. i'll be dynoing the car to see if this makes any difference. i've also got type 'b' cams going in afterwards to see if they make any further difference. will hopefully post up comparative results and hopefully Nismoid's theory of bigger exhaust = better is true!

Update on this: have bought some Tomei Poncams type 'B' and also have the caar booked in next week for a 4inch cat back system. the front pipes are decent, 2.75in twins to a 4in merge. currently the front pipe exits at 3in and its 3in cat back. so it'll be 2.75in off the turbo's and 4in from the merge back! i'll be getting the car dynoed before the cams go in, just to see if it really made any difference. as i havent changed anything else. then the cams will go in and hopefully the car will pull 500+hp

For Sale 3in stainless cat back exhaust to suit R32 GTR Flows well, have made 350rwkw with this system. No dents, has good clearance, great sound. $200 3in stanless high flow cat (Magnaflow) has little use, flows well. $100 Located in Glenelg SA Phone: 0421 125 183

3inch (stainless) cat back exhuast to fit a 32 GTR $200 3inch high flow cat (magna flow) $100 3inch decat $50 the decat and exhaust are still on the car, will be coming off in the next week or so.

keep the std airbox nothing wrong with them at all. keep the standard rail, i am using the std rail with 1000cc injectors and it works fine i'd stick with what you've got, the only thing i would change is the fuel pump. a bosch 040, 044 or walbro or jap (tomei, nismo) will be fine. if you can run over 20psi, do it to really wake up the -5's

finally took the track pads out of the GTR last night. the rotors have seen better days, the backing plate on the pads has all the paint flaked or broken off. the tyres are shocking! 2 huge flat spots! the front under guard is just zip tied on. it at least starts easy, and runs fine. its sad looking at the wheels and seeing cobwebs connecting the brakes and wheels! GTR definitely is in need of some TLC

i'd be looking at comp testing the motor. or possibly setting the cams back to zero and seeing if it makes any difference? i had a very similar setup to you appart from using -5's and was making over 300kw @ 17psi the std intercooler is fine for 350kw and i'm still using std airbox at 365rwkw youre exhaust sounds to be adequate enough for that power, not too sure about the xforce dumps? i have never used them so can't coment on them? i would do the following: set cams back to zero and test check all piping for leaks comp test the motor. hopefully that'll give you a reason why such a low figure

it sounds like you just need your plugs gapped smaller. i had a similar issue with my GTR it was tuned fine on the dyno, but in some real driving conditions (on road, especially up hill) the car would miss. went back to tuner, he gapped the plugs down further and problem went away. i think the plugs were gapped to 0.7?

3in High Flow Metal Cell Cat (Magnaflow) has the sensor bung welded in. Good condition, no longer needed as i'm going for a bigger exhaust. $150

front RH inner guard and brake duct.

yep sounds like a cooler hose i hope for your sake it's not split.

i've only got a 2.6L so it wouldnt have as much torque as a 2.8L the 270's would be laggier than the std cams, but flow much better top end. with stock cams in mine and a bigger exhaust i think 380rwkw would be more realistic. 400rwkw would probably be a little bit of a stretch? 400 might be achievable with bigger exhaust and some 260 degree cams? go the stock airbox! i've got no intentions on changing to pods! i love the std look under the bonnet. completely thows people when it get strapped to the dyno and is a 350rwkw car.

i wouldnt mind picking up 30-40rwkw from just swapping exhaust. Nismoid you're still running std cams too aren't you? how about you Piggaz? from what i remember the tuner said that anymore boost wouldn't net any higher results. it would just generate more heat.

i suppose when you start shoving 24psi of boost through -5's there is a fair amount of air flow! those restrictions are probably causing the graph to table top. the exhaust does sound quite full of air when at WOT. at least now we know that 3in will flow 350rwkw but at slightly higher boost.