ok well im new to the z32, so i have a few questions. first off i hear it has all wheel steering, is that correct? and my other question is just a general question. i know the z32 tt comes with t25 turbos, what do the numbers means that has always confused me because ive heard that a t25 is a pretty small turbo but i always hear people talking about the t3/t4 or a t66 so im confused as to how the number system works. also how many miles is a 91ttzx good for

ok well im new to the z32, so i have a few questions. first off i hear it has all wheel steering, is that correct? and my other question is just a general question. i know the z32 tt comes with t25 turbos, what do the numbers means that has always confused me because ive heard that a t25 is a pretty small turbo but i always hear people talking about the t3/t4 or a t66 so im confused as to how the number system works. also how many miles is a 91ttzx good for

i dont know about the turbo numbers. they confuse me too...the bigger the number the bigger the turbo, in general.

and yes the Z32TT does have all weel steering" and adjustable suspension. the N/A version does not...the rear steering is called HICAS, depending on speed and how much you turn the wheel it turns the Rear Wheels up to like 3 degrees. doesnt sound like much but it makes a big difference.

a 91 300zx Twin Turbo would be good for 200k plus if taken care of but everyone knows the less a performance car is cared for the less its gonna wanna run right. in general, the turbos will last till 120-150k and the motor will run until 200k plus with minor sensor and hose replacements along the way.

ok well lets say i hit 200k, and its time for a rebuild, gaskets, seals, rings, and a good honing, is that about it? and then whould it be cheaper to rebuild the turbos or get new ones?

ok well lets say i hit 200k, and its time for a rebuild, gaskets, seals, rings, and a good honing, is that about it? and then whould it be cheaper to rebuild the turbos or get new ones?

well, i would get it rebuilt at 200k but if it running good then just keep driving it. im not saying thats its just gonna stop. technically, it could keep going forever. anyways, yeah once it dies...a rebuild would be in need with a lot of new parts. but it wont be that costly...

as for the turbos, it will almost always be cheaper to get them rebuilt.

but if your like the rest of us and the turbos need rebuilt and the engine needs rebuilt...that means its time for some upgraded parts. rods, ARP studs and bolts, OEM bearings, heat treated forged pistons, performance valve train, some performance cams, BB turbos, huge sidemount intercoolers...as you can see the last can go on and grow very expensive. i would atleast do the rods, ARP's, and pistons if i was rebuilding the engine. then you have a motor capable of 600+hp....depending on what kind of power your turbos can produce. :cool:

I AM NOT AN EXPERT AT THIS STUFF! TAKE THIS FOR WHAT YOU WILL BUT DON'T TAKE IT AS CONCRETE!

http://files.automotiveforums.com/gallery/watermark.php?file=/503/13360turbo12-med.jpg

Not a great representation but its all I could find without looking too hard so its all you're going to get.

Turbos in general are rated by a few critical demensions like A/R ratio, flow rate and compressor/turbine trim.

The numbers you see (T3/4, T25, T66) are representative of how much air the turbo will flow. Example: T3/4 hybrid turbo has a T3 category compressor (intake air) housing and a T4 category exhaust turbine housing (exhaust side-duh). The larger the turbo, the more air it can flow and the more power it can make. The smaller the turbo the more responsive it will be and the quicker it will make boost.

A/R ratios represent what rpm range the turbo is designed to work in. .59 and below are small turbos designed for minimum lag. .60-.80 tend to be comprimises between lag and max powerout put for specific applications. .8 and above tend to be race only or max power street turbos because they take so long to start producing boost. Thus the small stock turbos on 300ZXs that were designed with minimal lag and quick response in mind are T25 (Garett T25 intake with T2 exhaust housing) turbos with .63 A/R for the 5 spd and an amazingly low .54 A/R for the automatic (the 4spd auto trans with taller gearing warranted smaller, more responsive turbos to match the superior gearing of the 5 spd).

Here is a much more in depth article that gives you the actual math behind the numbers:

http://www.automotiveforums.com/vbulletin/showthread.php?t=201348

I AM NOT AN EXPERT AT THIS STUFF! TAKE THIS FOR WHAT YOU WILL BUT DON'T TAKE IT AS CONCRETE!

http://files.automotiveforums.com/gallery/watermark.php?file=/503/13360turbo12-med.jpg

Not a great representation but its all I could find without looking too hard so its all you're going to get.

Turbos in general are rated by a few critical demensions like A/R ratio, flow rate and compressor/turbine trim.

The numbers you see (T3/4, T25, T66) are representative of how much air the turbo will flow. Example: T3/4 hybrid turbo has a T3 category compressor (intake air) housing and a T4 category exhaust turbine housing (exhaust side-duh). The larger the turbo, the more air it can flow and the more power it can make. The smaller the turbo the more responsive it will be and the quicker it will make boost.

A/R ratios represent what rpm range the turbo is designed to work in. .59 and below are small turbos designed for minimum lag. .60-.80 tend to be comprimises between lag and max powerout put for specific applications. .8 and above tend to be race only or max power street turbos because they take so long to start producing boost. Thus the small stock turbos on 300ZXs that were designed with minimal lag and quick response in mind are T25 (Garett T25 intake with T2 exhaust housing) turbos with .63 A/R for the 5 spd and an amazingly low .54 A/R for the automatic (the 4spd auto trans with taller gearing warranted smaller, more responsive turbos to match the superior gearing of the 5 spd).

Here is a much more in depth article that gives you the actual math behind the numbers:

http://www.automotiveforums.com/vbulletin/showthread.php?t=201348

thanks broke...that explains alot about why the numbers are there.

how would i know if the engine that was shipped to me came from an automatic with the .54 A/R rating or if it was from a 5-speed with the .63 A/R??? does it say somehow on the charger itself???

what would yield if someone were to install the .54 A/R rated T25's on their 5-speed??? wouldnt it be better to do this combination beings the auto was still rated at 300hp so max power wasnt sacrificed, right?

i got so many light bulbs lighting up in my head its not even funny...:lol:

you can only trust the turbocharger ratings to a point... some companies use different names for their turbo's, for example, garrett now uses the 'gt' rating for their new line. also, the t3/t4 things aren't always true either... the dsm turbo upgrade for the older talons is a td05h... now if that was a garrett turbo, that thing would be MASSIVE...

just a thing to watch out for... knowing the a/r and wheel specs is best when selecting the right turbo

wow thast a nice writeup posted up there gives u a good prospective if you didnt already know it..


yah not all companies are gonna be the same they use diff numbering systems so its manufacturer specific pretty much ...