Just wondering if you can help me out. When i was first getting my Z last year im sure i read somwere that the manual car comes with bigger turbo's. If it's true could you please tell me as i said this to somone the other day and they replyed "WHY??". What a dong i felt when i couldn't explain :o :nelson:

They aint bigger - just different A/R. The manual can make more use of the top end power, whereas the auto benefits more from torque - the different a/r on the auto turbos give less power but a bit more torque.... Also the cams are slightly different too...

A/R is that air ratio??? So is there any real difference in performance? So if your saying the auto has better torque does it loose it puff at higher speeds. Would it be noticable if you put auto n man next to each other and raced. Not that im wanting to change from what i have;im just wondering?

A/R is that air ratio??? So is there any real difference in performance? So if your saying the auto has better torque does it loose it puff at higher speeds. Would it be noticable if you put auto n man next to each other and raced. Not that im wanting to change from what i have;im just wondering?

 

Well I put manwell tubs on my auto and there was a big difference , the old auto tubs used to be fully spooled by 2krpm , the manwell ones are not fully spooled untill 4krpm , there is definatally more grunt with the manwell tubs higher up the rev range , the car is just a little slower of the mark but once spooled no probs , the other thing is that you have to drive around towns etc with the overdrive off to keep the revs a little higher as most of the time you are sat in the 1-3k power band which was fine for the auto tubs but laggy for the manwell tubs

 

Ryan

A/R is to do with the compressor blades - can't remember exactly so won't even try to describe but I'll find out if you want...

 

I don't think the final result will have much in it tbh - the different setups are to overcome the differences between the two boxes....

I think A/R is something like the ratio of the turbine housing to the outlet.

Stolen from http://www.ztechz.net :

 

A/R is a ratio of the exhaust discharge area vs the distance from the center of turbine wheel to the center of the cross sectional area. Smaller A/R housing has faster spool up. Bigger A/R housing has less back pressure, more flow for the top end.