[Updated on: Thu, 18 December 2003 07:43]

[Updated on: Thu, 18 December 2003 22:25]

Hello again,

Bazooka asked: "Shane, did you ever run your engine with the stock turbo or was it highflowed before you did any running? Interested to know how much different it was."

The turbo was run on the car in stock form (with the ZE standard computer). It spooled up a bee's dick quicker than it did after the high flow (barely noticeable though). After the highflow the turbo was rated at 320hp, so pretty much on par with a BB T28 with the 0.64A/R housing I believe. The big difference with the highflow is the change to steel wheels etc that allow it to be run up to 25psi (not that it sees quite this high ) and the higher flow capacity allowing it to make more top end. The old ceramic wheels limit boost to around 15psi I think (correct me if I am wrong???)

Bazooka said: "Who said these puff out at higher RPM then????? (referring to the T28)"

A lot of people have responded to your post offering their first hand experience eg Phil, mrshin etc. Given that the 4AGTE set up is open to a lot of differences given that its a custom setup you will always get differences between peoples cars. However, you will also notice that on these forums a lot of people love to offer information based on rumour and hearsay eg "....my mate dangerous Dave has a mate who new someone that had a commondore that raced a guy who knew someone etc etc......" take all the information on these forums on board, read between the lines, and make up your own mind. That said its probably safe to estimate that the T28 will run out of puff on a 4AG at probably 175 to 180kw @ wheels or so (depending on the rest of the set up,and many many other variables).

Mrshin said: "Another tip - the standard GZE cams (same as smallport) are terrible for turbos! Use the older NA bigport cams, whatever head you've got"

Very interesting, I am keen to try some out if my terrible ZE cams can keep me happy now, then something better can only be more fun

Pop along to the next dyno day and I will more than happy to take you for a spin Bazooka. Then you can see for yourself how it goes, but you will probably have made up your mind and got your turbo by then.

As feral4mr2 said, I have the same experience, I don't get any drop in boost running at 18psi all the way through to the rpm limiter, in fact it creeps up a 1 to 1.5 psi due to the wastegate being a tad on the small side .

Cheers.

[Updated on: Mon, 22 December 2003 23:16]

There has been a few Comments made about the Running a lot of ignition advance , Just be AWARE you may not be getting the correct timing reading if you have a ,,Coil pack GZE and using a Timing Light with adjustable advance feature in the timing light ,, The engine is actually running less Ignition than the timing light is saying ,If the Advance Adjustment on the timing light is used to check the engine timing ... So how can this be so ? This Due to 1 coil pack firing to cylinders .. So the Timing light reads the RPM of engine as twice as fast as what the engine is going. Eg engine At 1500 RPM ,,Timing light RPM 3000RPM.......When you use the ADVANCE adjustment in the Timing to check the Engine Timing the reading will be wrong,, due to the timing light calculating the Flash of the light on 3000rpm not the true 1500rpm .. so this is why the ignition timing light readings show lots advance but the engine ignition timing is not really that high ... Some Timing lights have a "2 stroke "setting if you use this setting you will get the correct timing of the engine .. Other wise don`t use the "advance timing Adjustment" of the timing light to check the ignition timing as it will not read correctly .. Hope that makes sense note This only applies to GZEs with coil packs and a Timing light with TIMING ADVANCE Adjustment's..

[Updated on: Sun, 28 December 2003 00:07]