buying a import 300zx this weekend,

 

plan on increasing the boost a little. Asume they run 10PSI standard??

 

can the standard fuel pump handle say 14PSI??

 

my S13 needed a walbro, as the standard one cudnt provide enuff juice on demand (feel car holding back)

 

also is the ECU have fuel cut? (its a Jap car, converted to MPH)

remember engine has got to come out to replace them. Its up to you.

 

yes but you could argue that with an aftermarket exhaust?

There are soom good points that have been made on this thread and you should pay heed to them.

 

Just remember - a lot of what is said on here is just opinion, and in many cases people are just re-iterating what they have been told rather than knowing from experience...

There are soom good points that have been made on this thread and you should pay heed to them.

 

Just remember - a lot of what is said on here is just opinion, and in many cases people are just re-iterating what they have been told rather than knowing from experience...

 

I am unsure asto what you are saying there as it is a little ambiguous?

 

Z32 the limit for your injectors is 14 psi anything higher and you are running the gauntlet, even at that level the injectors are overworking!

 

The limit for your turbos is 15 psi above that level and they start to become inefficient in charge temp and their lifespan is severly reduced!

 

I have never hear of anyone's turbo seals going from fitting a higher flowing exhaust, only from removing their cats!

 

You seem to be drawing a comparison with the 200sx and 300zx, really you would be better off wiping the slate clean and starting afresh :)

i always ran on v-power/optimax but i was wondering what were people running there zeds on before, cause these high octane fuels haven't been out for that long.

i always ran on v-power/optimax but i was wondering what were people running there zeds on before, cause these high octane fuels haven't been out for that long.

 

We used to fill up with 87 but add a bottle of shampoo which acted like a stabiliser which slowed down the burn time. or was it hair gel? :wack:

 

I think super was always available???

yes but you could argue that with an aftermarket exhaust?

 

No

 

Because the exhaust (if its cat back) only affects the gases and pressures behind the cat which is fine, cant make anything any worse.

 

Idealy on a turbo car you dont want an exhaust, you want as little back pressure as possible, this way the turbine is not affected by pressure backing up and slowing the acceleration of the blades.

 

However, most zeds are at the very least 15 years old, so old johnny turbo at the back and bottom of the engine has got very used to haveing its weakened seals held in place by the nice pressurised environment that is allowed through the cats.

 

As soon as you remove them the pressure is gone, so when the turbos spin they try to force oil passed the leaking seal since its no longer held where it should be, which burns in the exhaust and hey presto smoke.

Just remember - a lot of what is said on here is just opinion, and in many cases people are just re-iterating what they have been told rather than knowing from experience...

 

I've had my Z for 6 years now and had a fair few problems with it, most of them caused by upgrades. I wish I had leant by what I heard, but before I got the chance to do that I learn't by experience :D.

 

Decat ?. After having my engine out for sticking valves, I was told that my turbo's had plently of life left in them. Shortly after that I decatted, 2 months later my passenger side turbo started smoking. 4 months after that I could not get any boost and the blades of my turbo's were griding up the casing. Hense the reason for rebuilding the engine.

 

Injectors ?. I have done many rolling roads and have many graphs with Air fuel ration in comparrion to boost psi. 14.5 was the max my injectors could push out. I assume it would have been 14 psi if it wasn't for the aftermarket FPR.

 

Turbos ?. Again rolling roads and Thor dyno's. The difference between 14.5 psi and 16 psi was about 15 bhp and a little detonation. Worth it for 15 bhp ?. Not at all. The difference between 13 psi and 14 psi was 18 bhp.

 

Fuel, I can't say I've ever dyno'd my car on 95 ron, but I know that a few times in an emergency (i.e. no shell garages near by) I've had to put in 95 and I got det at 14 psi and had to turn it down to 12.5 psi before the det went, therefore if I had to put 95 ron in I would only run the car at 11 psi max.

JDM 300 or UK?

 

and what fuel 95 or higher?

 

Shell V Power. Goes very well, very fast. Just wanted to point out some of the problems of increased power.