Z32 Afm Required For 300kw?

[DAN00H]

Brandon

I like your idea of keeping it original. what I would be doing is checking your fuel rail pressure to ascertain the health of the fuel pump 1st - don't want that letting you down.

Can I ask why you want to put a cheap cat in? I know it's attractive to pay less, but the old addage: the joy of a cheap price is quickly lost when quality fails, certainly applies.

I coughed up the additional $ and got a HKS cat (not saying you should, but I've seen a few failure reports on catco/ xforce + they are not ADR compliant - I checked for my area).

I'd agree with others when they say that 300 is doable. mine only has 2530's, decent exhaust/ induction and makes just shy of that on 18psi. Stock inj/ AFM - but with nismo pump and tweaked ECU. I bought inj's, PFC, Z32's Poncams etc, but am satisfied with the power it makes without them...

good luck with it

[Brandon]

How do you check the pressure? Well I would love to have a HKS one but at this moment, I dont wanna use up everything in my bank =x If the Catco one will last me for a a couple of years it'll be good enough. Like I said, I'm happy with the amount of power drawn with the level of mods I have (if it does come up close to 300). Another thing is if you have stock dump/front pipes, I dont think changing the any brand of cat would make a significant difference and probably the factor to condition is durability instead of power. If a HKS cost 800 and Catco 200 and the power difference is 5kW with Catco lasting you somewhere between 2-5yrs and HKS a lifetime, I would go Catco and use the spare cash for something else. The next mod on the list would be coilover and after that if I get a lil serious, I will have the cat and front/dump pipes done as well.

At the end of the day, it might be the same logic as exhaust size, a 3" is a 3". The amount of power/airflow is more or less the same doesnt matter which brand you go with. The fact that we want a JDM exhaust is because of the quality of welding,finish,sound etc. But in terms of power/airflow, its bugger all difference for the price you're paying.

PS: Correct me if I'm wrong but this is what I've picked up from reading on people's experience.

[DAN00H]

Most competent mechanics will be able to test pump rail pressure.

I saw a few reports of early life failure in the catco/xforce cats (search will show what brand and when) but they seemed pretty average to me. i chose HKS due to CPI count and design, but yes - not cheap!

Interestingly, the exhaust I had made locally (with mandrel bends) is a LOT less power productive than the jap (unbranded) catback. both only have 1 straight through muffler with 1/2 inch difference in size... odd. I will be putting this back on when I get time!

Edited August 10, 2009 by DAN00H

[Brandon]

Hey you've got me thinking for a min. Even if the fuel pump is working ok, it might be advisable to get a fuel regulator as well. But is that thing even legal? If its not I'll give that a miss. If I do get it, does that mean I will need a new fuel rail as well??

Thinking about something like this,

http://www.nengun.com/hks/adjustable-fuel-pressure-regulator

[DAN00H]

Hey you've got me thinking for a min. Even if the fuel pump is working ok, it might be advisable to get a fuel regulator as well. But is that thing even legal? If its not I'll give that a miss. If I do get it, does that mean I will need a new fuel rail as well??

Thinking about something like this,

http://www.nengun.com/hks/adjustable-fuel-pressure-regulator

yes, a FPR (fuel pressure regulator) is legal, there is a stock one at the front of your fuel rail. using an A/M adj one allows you to increase the base pressure. this can of course show deficiencies with your current pump as you are asking it to work harder. the benefit is it supplies greater pressure to the injectors. usually the stock one is sufficient for your power goal, but I have a nismo one sitting around if you really want one

oh - most of them work with the stock rail

[GT-R32]

Well, after the install of the HKS front pipe, the turbos spool up like crazy. It's great. Which also leads me to believe I don't have HKS2530s, but HKS GTSS. That would explain the low power figure of 270awkw previously also.

Booked in for its clutch and tune next week. Should have some numbers on Friday night. Just being conservative and hoping for 260rwkW given the exhaust restrictions and tired old engine (I also put a quieter 3" muffler on the rear I had lying around to replace the cannon).

[Brandon]

There 1 HKS front pipe for sale now... you're tempting me...

[GT-R32]

I bought my HKS second hand. I wouldn't have paid retail for them. However, the Blitz unit at Just Jap is great value for new. I would steer clear of the Chinese shit as the shape is very different from the Japanese ones, which I am sure is for a reason (tuned length?).

I'm amazed at the difference it made to the spool up under 3,000 revs. I didn't realise the stock front pipe was that bad? Given it's a decent size. Either that or it's all in my head (also quite a possibility LOL).

[Brandon]

You still have stock dumps? You're really tempting me into getting this.

http://www.skylinesaustralia.com/forums/Hk...p;hl=front+pipe

[GT-R32]

Yes I still have stock dumps. Which from R31Nismoid's post aren't the massive restriction I thought they were. That's the same front pipe I have except mine isn't stainless.

[R31Nismoid]

I've got stock dumps on mine, 280rwkw @ 16psi from memory with GT-SS's, but ive got some stuff to sort out first and then ill go for 300-330rwkw, still using factory dumps

[DAN00H]

I use the Greddy MX in mild steel which works a treat.

[GT-R32]

I've got stock dumps on mine, 280rwkw @ 16psi from memory with GT-SS's, but ive got some stuff to sort out first and then ill go for 300-330rwkw, still using factory dumps

Far out I would love 300rwkW LOL. Will be happy with a conservative 260rwkW from the tired old thing though.

I use the Greddy MX in mild steel which works a treat.

Also great value right now and good size. But they don't have a flex bend, perhaps harder to install? Haha.

[DAN00H]

I have had the front pipes off a few times, and didn't experience any trouble getting them on or off each time.

[Brandon]

Alright, I'm getting them then. I just made a few enquiries for PFC and PFC Boost Controller and the lead time to get them in from Japan is ridicules, something like 1 month+. I'm having 2nd thoughts on tuning the car now. I might just get the cat, front pipe and suspension done instead if the wait is that long.

Hopefully during my saving up again after these mods something cheap will pop up on the forum.

[Brandon]

I've got stock dumps on mine, 280rwkw @ 16psi from memory with GT-SS's, but ive got some stuff to sort out first and then ill go for 300-330rwkw, still using factory dumps

NICEEEEEEE!

[GT-R32]

I have had the front pipes off a few times, and didn't experience any trouble getting them on or off each time.

Oh okay cool. I eat my words.

Alright, I'm getting them then. I just made a few enquiries for PFC and PFC Boost Controller and the lead time to get them in from Japan is ridicules, something like 1 month+. I'm having 2nd thoughts on tuning the car now. I might just get the cat, front pipe and suspension done instead if the wait is that long.

Hopefully during my saving up again after these mods something cheap will pop up on the forum.

Yeah you might luck out with second hand anyways. Good luck and I'll let you know how I go with the tune next week.

[GT-R32]

Well, there will be no tune as the car has one f**ked turbo. It's not totally dead but is making a bad noise on shut off so it was deemed unsafe to tune it. More cash to be spent. Yay.

[DAN00H]

are you going to replace with stock or aftermarket? Bummer

[GT-R32]

are you going to replace with stock or aftermarket? Bummer

It's the front one. I might just get it rebuilt. It's already a HKS of some kind. I was told 2530 but they spool so well I think it's a GTSS.

Interestingly I was told by the bloke tuning it that the stock air box will be a restriction when it's fixed, that it should see over 300rwkw with my turbos but the air box will keep it to 260/270rwkw. specifically put it back on as the pods were rooted. Thing is on here we've seen people on here with upwards of 340rwkw with them, so yeah I dunno.