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building a GTZ
Posted: Sun Mar 11, 2007 4:35 am
by zippy
I want to build a GTZ to it's maximum possible without doing anything to change the car drastically (i.e. the CORBERETTA project) and sticking with the 4 cylinder engine. I am specifically talking about a '90 GTZ with a 2.3 DHOC QUAD 4/ 5 Speed manual begining with the car in a "bone stock" state. as I stated before I would know what parts to buy to beef the drivetrain to handle high horsepower if we where talking about a RWD V8 from the 1980's but I'm new to FWD and GM part codes refering to berettas. I'm looking to acheve 300+WHP. Any suggestions from anyone who as performed similar projects is greatly appreciated.
building a GTZ
Posted: Sun Mar 11, 2007 5:18 pm
by weba
Build the shortblock with strong parts and add turbo & standalone engine management, and you'r set.
building a GTZ
Posted: Sun Mar 11, 2007 8:55 pm
by rweatherford
Turbocharged 300 HP at the wheels is not a problem. Getting that power to the ground is a real problem. If you ever get it locked to the ground I would say that you might have problems with transmissions and axles, but you might not.
You basically want a 92-94 Quad4 block, forged pistons, good rods, modified 086 or 753 head and HO or W41 cams. Then you need some very large injectors and a computer to run everything. Make sure the turbo is large enough for the task (ask turbonectics or similar vendor for sizing information) . A good exhaust manifold and down pipe can make a difference in the power department.
The guys over at the Quadforums can help you on your way to lots of boosted fun. I built mine from scratch. It was one of the first turbo Quads. Very primative compared to what can be done now.
building a GTZ
Posted: Mon Mar 12, 2007 1:28 am
by zippy
I'm looking to just build it so I can finish 1st in strait line races against the likes of a WRX STi and SRT-4 turbo neon
building a GTZ
Posted: Mon Mar 12, 2007 8:41 am
by rweatherford
Without AWD the STI is going to be rather difficult. That car will have several car length advantages just from the launch. Similar to the video of my old car racing a WRX.
When stock the SRT-4 is not difficult to beat.
building a GTZ
Posted: Fri Mar 16, 2007 2:50 am
by zippy
the deal about transmission and axle problems is the part I'm worried about. Does anyone know of a trans that is quite a bit stronger that is compatible?
building a GTZ
Posted: Fri Mar 16, 2007 2:53 am
by zippy
(rweatherford @ Mar. 12 2007,07:41)QUOTEWithout AWD the STI is going to be rather difficult.  That car will have several car length advantages just from the launch.  Similar to the video of my old car racing a WRX.
When stock the SRT-4 is not difficult to beat.
where is this video? I can't seem to find it. also I'm talking like a mile track.
building a GTZ
Posted: Fri Mar 16, 2007 8:30 am
by rweatherford
http://www.beretta.net/behind_the_wheel ... TZ-256.avi
A mile is a LONG way at WOT from a stop. Easy 150 MPH at the power level you are talking about. Racing from 60 MPH takes away most of your FWD disadvantage.
If you are still behind after a 1/4 most people are going to quit racing and you'll do the ricer fly-by.