Performance Mods

MSD Hook up pic (per request from a member of nissanmins.com).

Red (thick wire) = 12V (+)
Black (thick wire) = Chassis Ground (-)

Orange wire (+) = Coil (+)
Black wire (-) = Coil (-)

Red wire (+) = Brown wire (ECU)
White wire (-) = White wire (ECU)

The MSD box is connected to the Intake Coil ONLY.... Exhaust Coil is left in stock configuration.

First Mod was a Gibson Stainless steel muffler and custom tubing. I added an MSD 6A Ignition and Optima Yellow top

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Thorley and new exhaust install

Thorley header applications.

http://www.dougthorleyheaders.com/nissan_headers.html

Set-up consist of Dough Thorley headers followed by a Dynomax high flow catalic converter and finished off with a Gibson stainless steel muffler.
 
Here are my new Thorleys and also the old stock ones.

In order to remove the stock manifold I had to cut the pipe.The Thorleys have a straighter back than the stock manifold.

I used 2.5" pipes from collector, it sits lower than stock due to the transmission brace being in the way and the collector location and angle from the headers.

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I relocated the O2 sensor to the lower part of the headers where all the pipes come together. Result was better throttle and better gas milage.
 
 

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New exhaust
 
New mandrel bent pipe using 2-1/4" pipe and new tip. I regained some of the lost low end from the 2.5", the top end remained the same.

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Weber 32/36 DGAV carb.

Adapter info.

http://www.carburetion.com/Weber/adaptors.htm

Z24 Carb model (Non Z24i) = 99004.336
Z20 and Z22 (older 720's) = 99004.333

The carb adapter will only bolt on to a carb model Z24 intake manifold. To make it work on a Z24i you will need a carb Z24 intake.

Tunning info.

http://www.redlineweber.com/html/Tech/Table_of_contents.htm

 
Carb and Intake
 
Removed old intake and installed new intake with all the plugs.
 
After weber install, I was able to go past the 105 mark with ease but gas milage is really low (about 10 mpg). Before and after whiteface guages.
 

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Electric fan and jacobs ignition wires
 
reinstalled Hitachi carb due to smog testing.

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Blew headgasket
 
I blew the 2nd head gasket at 212K miles (First one at 190K miles) so I decided to replace the whole engine. They gave my the wrong head on the long block so I had to take it back.

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Tranny center bearing failure.

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Weber reinstalled on the new engine for some fun. Never got it to run perfect so I only usesd it for a week.
 

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Hitachi Carb cleaned, tuned and polished.
 
After having som problems with the carb I took it all apart and found some trouble areas.... the lower primary shaft had alot of play in it so I fixed it. I hand polished the parts I could.

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Polished Intake

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Last view of the Z24
 

Z24 is no more... I've blown one too many head gaskets. It's help up pretty good considering the kind of driving I do and hauling my quad around.

Future plans are to upgrade to a KA or SR motor.... see page 8

Index
1. General info
2. Performance Upgrade
3. Interior & Sound
4. Exterior & Paint
5. Suspension Upgrades
6. Fiberglass Projects
7. KA24E Engine Swap 
8. Firewall changes (room for Turbo)
9.  Turbo
10. Misc pics (Quads and Truck)