'Z' - Dumps on the Dyno..........

.................a number of members have asked about the advantages of Dumps,... 3'' dumps in particular. It is well known that 2.5'' or 3'' Dumps do improve performance. Here is a Dyno sheet showing exactly how much.

If you wish to speak with the owner of the Zed tested, please advise and I will arrange it

The Specs on this Zed that were constant in both Dyno Tests are:-

Stock heads, intercoolers, dual-pop, 2.5'' cat-back
Block is AMS prepped with Wiseco Pistons & ARP Fasteners
Z1 725 Turbos
AMS Max Flow Manifolds
Base timing of 15 degrees
94 Octane fuel.

The first Dyno sheet shows BEFORE fitting AMS 3'' Dumps and TP's

The second Dyno sheet shows AFTER fitting AMS 3'' Dumps and TP'S at the same boost

A whopping gain of 71 HP and 66 Torque was achieved.

These Dyno Sheets were kindly donated by AMS Zstore




I AM SORRY ABOUT THE SIZE, BUT MY RESIZING SOFTWARE IS NOT WORKING PROPERLY.......

IF YOU NEED COPIES EMAILED PLEASE ADVISE HERE :- stsaus@bigpond.com

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Was the before figure tested suing the stock US exhaust with pre-cats? If it was it would skew the results for any Aus comparison since we didn't get precats.

 

Probably won't make much difference as we didn't get the twin turbo either

 

I assume the before pic was with stock dumps?

 

US TT dumps had cats in them for cold start emmissions, Jap TT's didn't as they do SFA.

 

Correct.............

.........

 

Actually..............

......that is not relevant for this excercise, this is merely to show the improvement gains of before and after fitting the Dumps and TP's , not comparing the amount of increase in gains between US or Oz Zeds

 

Was this done straight out the tp's or did it run with the 2.5" cat back ?

If so how did they convert from 3" to 2.5" ?

 

Both.........

......were run with the 2.5'' cat back

 

Thats a hefty gain 71HP not bad, would hook up with http://www.z1motorsports.com/product_info.php?cPath=6_19&products_id=2780
there is a 3" to 2.5" option in sizes.

 

do jap-spec z's have 4 bolt or 5 bolt dumps?

 

Standard TT have 4 bolts regardless of origin.
Its when u go aftermarket turb's u have to switch everything to 5 bolt

Regards
Trev

 

I disagree. If the test shows the gains in going from a stock US dump which has a pre-cat in it to an aftermarket dump what relevence does it have to our cars which don't have pre-cats fitted?

 

I believe that........

......your question has already been adequately answered.:zlove:

 

Thanks........

.......for your imput, it is greatly appreciated I am sure by all:zlove: You seem to have missed the point also.

 

Not stock turbo's

Not a real surprise on bb turbo's , do you have any charts for stock turbo's?

 

i dont think it has been ,,,, the figure can not be the same ........

 

Please.....

.......advise where I have said "it woud be the same", I believe I have not. This is purely information of two tests done that show huge gains. Also provided were all the specs. No further answers really need to be given. Folks can read this and be informed. Until someone does the same type of comparison on an Australia Zed, no-one can say, exacty what the difference will be between the US Zed and the Oz Zed. Of course the figure may or may not be the same, but that is not the point here really is it. Unless someone can say with actual experience and dyno sheets to prove it that the similar set up on an Oz Zed, would show little or no gains at all I think we would all accept that woud not be the case. Thanks for your input:zlove: