As far as I know, my zed's running standard boost. I know it's been chipped (Jeff at Zedworld has had it on Conzult) and I have an induction kit, cat back and turbo timer, but apart from that I thought it was standard.

 

However - when I put my foot down it boosts (smoothly) all the way up to just below 7 mm/Hg (it's a Jap import) on the stock gauge. Is this normal or am I running higher boost?

 

I didn't think anything of it until I read an article on the Aussie 300ZX site the other day that said stock boost i.e. 9 PSI = 4.3 mm/Hg

I would say you could be running a bar (14psi) especially seeing as its got a chip in it.

 

Only way to be sure is to put an aftermarker boost gauge on it and T it into one of the feeds from the balance bar.

Ta turb0z - I'm planning on doing that anyway. Looking at getting boost, oil pressure and temp in a DIN slot, so I'll check for sure when I do that.

 

On one hand great - no wonder it feels quick! On the other hand, bugger - I was hoping to put boost jets in and make it even quicker ;)

Ta turb0z - I'm planning on doing that anyway. Looking at getting boost, oil pressure and temp in a DIN slot, so I'll check for sure when I do that.

 

On one hand great - no wonder it feels quick! On the other hand, bugger - I was hoping to put boost jets in and make it even quicker ;)

 

If you havent got a boost controller then it will probably have jets already in it. There are a few other things you could do but I think your outta steam now without causing damage :)

Most boost controllers will tell you what PSI your running, just make sure you remove the boost jets before fitting one ;)

if its hitting just below the 7 mark on a jap gauge it could be on saftey boost, BUT as Pete (turboz) said get your self some aftermarket gauges and that'll tell you right

if its hitting just below the 7 mark on a jap gauge it could be on saftey boost, BUT as Pete (turboz) said get your self some aftermarket gauges and that'll tell you right

i thought 7 on a jap gauge was the same as 14 on the UK gauge?

yes it is, look at the instrument panel here

http://www.300zx.org.uk/mod_comp_1.htm

+7 on a JSpec is 700 millimeters of mercury equivalent to +14, 14 PSI (or there abouts) on a UK so "just below" will possibly be stock boost of 9 - 10 PSI (ish)

Just had a look at a conversion site and +6 (600 millimeters of mercury (or mmHg)) is 11.602 066 723 PSI

Thanks all - it looks like I could be running a higher boost then. By 'just below' I mean above the 3rd mark away from zero, but not QUITE hitting the 7. I will have to have a good look though as it may now be all the way up to 7, as I sorted a major boost leak last night (PITA that was too - it was on the clamp where the hose runs from the passenger side turbo back to the IC and changes to the hard pipe...)

 

Will be nice to get some proper gauges in there as soon as I can afford them!

Had my car dyno'd the other weekend... and I'm running stock boost! Too right the stock gauges are inaccurate!

 

Still, 323 RWHP on stock boost ain't bad I suppose ;)

Had my car dyno'd the other weekend... and I'm running stock boost! Too right the stock gauges are inaccurate!

 

Still, 323 RWHP on stock boost ain't bad I suppose ;)

 

That would be flywheel HP, not RWHP ?

 

Stock RWHP is about 230-240. Stock FWHP is 280-300

 

323 hp at flywheel is a very good figure for stock boost. Would be impossible for it to be rwhp though.

hell... standard RWHP on a TT is about 240! They are only 280bhp - 300bhp at the fly depending on model. So youve got 80BHp for nothing.... or an inaccurate dyno!

 

If it was 323 at the fly then that is plausible for a car with induction, exhaust etc.

That would be flywheel HP, not RWHP ?

 

Stock RWHP is about 230-240. Stock FWHP is 280-300

 

323 hp at flywheel is a very good figure for stock boost. Would be impossible for it to be rwhp though.

 

hehe 3 minutes ahead of me!

hell... standard RWHP on a TT is about 240! They are only 280bhp - 300bhp at the fly depending on model. So youve got 80BHp for nothing.... or an inaccurate dyno!

 

If it was 323 at the fly then that is plausible for a car with induction, exhaust etc.

 

Oo! Didn't know I had any new replies in here!

 

Hmm - that's strange then. Maybe they meant to say FWHP! I didn't question it because I thought: 300bhp standard (albeit at FW), a chip that I was told should give it 60-ish bhp more (is that true?) and a bit more from the induction kit and exhaust. Lose a bit through the drive train to the rears = 323.1 (don't forget the .1 ;) ) RWHP! Maybe I should get it dynoed again and get a second opinion on the original run... :x:

A chip wont increase your power output at all on its own.

 

All the chip does is allow the ecu to calculate how much fuel is needed at higher boost levels.

 

As your running stock boost the chip itself wont be giving you any more power.

 

40 extra hp from a cat back and filter is very good however, I would only expect 25 - 30 over the stock 280 (fwhp) at the most.

A chip wont increase your power output at all on its own.

 

All the chip does is allow the ecu to calculate how much fuel is needed at higher boost levels.

 

As your running stock boost the chip itself wont be giving you any more power.

 

40 extra hp from a cat back and filter is very good however, I would only expect 25 - 30 over the stock 280 (fwhp) at the most.

 

Cheers edk83,

 

That makes more sense. After all, as you said, a chip just gives you a different fuel map, mainly at the high end of the scale, right? I didn't understand how that could make such a difference.

 

Still - two bits of good news there then! Not only am I getting a good bhp figure already, it's going to be even quicker when I turn up the boost :dance:

 

Thanks for the help everyone :)

Yep :)

 

mine runs 320hp at 10psi and 370 at 16psi

A chip wont increase your power output at all on its own.

 

All the chip does is allow the ecu to calculate how much fuel is needed at higher boost levels.

 

As your running stock boost the chip itself wont be giving you any more power.

 

40 extra hp from a cat back and filter is very good however, I would only expect 25 - 30 over the stock 280 (fwhp) at the most.

 

 

Not strictly correct, a chip will have an affect on power. Some of the more aggressive chips can give quite a nice power increase across the range over standard, even with standard boost, as they improve the fuel mixture and timing.....not talking massive amounts here though.

 

Others, like JWT run more on the rich side for safety and probably wont improve power on their own.

 

but still 90% of the power increase will still come from increasing the boost rather than the chip itself.

Hi guys can anyone help, ive found a company on the web that will chip my ecu with a stage 3 chip, they claim the boost will be raised to 14 psi as long as i have a free flowing exahust and air filter.

I have the filter but have only changed the back box is this ok dont i need to upgrade the injectors i just want to be sure before i do it.