| No name "t28's" in stock housings are often a disaster.
all the dyno links i could find from like 01 when everyone was doing this are gone. (dsp? lulz... oh wait.. i bought those)
[ http://twinturbo.net/net/viewmsg.aspx?forum=technical&msg_id=694402 ]
"Brand X Fake T28 (from various "upgrade" companies including many famous ones) Pros:
Cheap, people on forum with no dyno access think they are good. Bolt directly to stock downpipes. Cons:
A big POS. These are big 65 trim T-3 compressor wheels carved to fit in the stock .48 a/r T25 compressor housings. This sucks as it effectivly eliminates the diffusor section of the compressor housing. About 30% of the air's compression takes place here so it is critcal to maintain this. Old 40's turbos had no diffusor and were less than 50% efficent because of this. This sort of compressor upgrade might flow better but will heat the carge temp to over 300 degrees F at 20 psi of boost. You can see these suckers instantly boil ice water sprayed on intercoolers on the dyno at high boost. Very peaky power output. The turbine is usualy a 68-79 trim (depending on company) T25 "G" (there is really no such thing as this) carved into the stock T2 .63 or worse yet .48 a/r exhaust housing. Although the exhaust side is not as sentive to wheel to housing geometry, the smaller housing flows worse and is less efficent. Poor efficency all around leads to lag and backpressure. Backpressure leads to reversion and detonation. Notice that many people that run these turbos seem to have engine failure? Compressor to turbine mismatch also results in thrust bearing failure. The lag and peaky power these piles make fools people into thinking they are fast." Now ash and others have said that it was possible to make certain combos work passably well, such as the JWT sport 500, or the Z1 525. In other cases the performance is completely unacceptable.
Antihero
Putting AMS garbage, and $500 ebay wheels on a Z is like
dressing a Victorias Secret model in a Walmart dress and
Payless shoes. You're embarrassing yourself. |
