My green TX coupe, 4ZD1T 422rwhp vids page 15

This Forum is here for each member to post pics of his/her Gemini’s. Keep it to one thread per car.. if you get more pics etc, add them to your existing thread, DO NOT start a new one
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redzone (coxy)
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Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by redzone (coxy) »

I really have to update this thread... lol
GARAGE REDZONE sunshine coast ph 07 54433507

1975 TX coupe 4ZD1 efi turbo 10.787 @ 123/128
1977 TC Fashion Pack sedan draw through turbo
1984 TG PF60E dohc Group A racecar
1984 TG Panelvan
2006 Crewman SS 6.0
Turbocoupe75
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Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by Turbocoupe75 »

Yes please !!!! My favourite engine !
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redzone (coxy)
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Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by redzone (coxy) »

She's sitting hibernating in my garage at home, not a lot of spare time with acreage and a 2 year old lol. First priority is to get the white TC roadworthy so we can sell it, then I can play with the green car again. There's a fair bit needed, most pressing thing is to get the head done again as the valve guides are shot again (needs lash caps to improve the geometry I think) and the stem seals leak so bad it oil fouls the plugs within a couple of minutes of driving. Need to fit the new gears to the diff and machine up a solid spacer so it doesn't break another pinion shaft. Need to do something with the intake manifold as it's cracked again, I have a mate that's confident he can weld it so it doesn't crack again, i'll make a brace to go underneath it to the block aswell as I think harmonics are killing it. Will end up with a plazmaman intake on it once I have cash again too.. At some stage I will also give the engine a freshen up, it's been in the car since 2010, only thing that's come out since then is the head, I will likely rering/bearing the engine, fit one of my crank girdles and fit a copper h/g. If i'm financial enough I want to get the head redone with a new spec cam and bigger valves/more porting, the current head only flows 195cfm at 450 thou lift, current cam is only 460 thou so there's plenty to be gained, a mate's E1 i'm building has a 550 thou lift cam and 230cfm at that lift, and should be a lot easier on the guides than my 1993 spec Tighe cam.

And some time in the future I want to remount the engine further back (on stock Gemini engine mounts) and replace the piazza dissy converted to CAS to a crank and cam trigger setup so I have the room to do that.
GARAGE REDZONE sunshine coast ph 07 54433507

1975 TX coupe 4ZD1 efi turbo 10.787 @ 123/128
1977 TC Fashion Pack sedan draw through turbo
1984 TG PF60E dohc Group A racecar
1984 TG Panelvan
2006 Crewman SS 6.0
DR_GEM
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Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by DR_GEM »

Nice to hear an update Coxy.

Good luck with the refresh. I’m keen to know where the 550thou cam came from? Assuming from a blank billet? Mine has 500thou valve lift (303 at the lobe using 1.65 rocker ratio) but didn’t know we could get up there

My head is flowing 196cfm at 450 thou on the inlet - that’s just a standard oem head with a number 2 Casting - open chamber. I’ve got a brand new kidney bowl China head here but didn’t want to use it as the other head was ported and setup all those years ago (15 infact - and engine is yet to be started lol ) - keen to hear thoughts on the cam as I know the kidney bean heads can be ported to flow over 220cfm and from memory flow about 190-200cfm stock !

Mick
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redzone (coxy)
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Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by redzone (coxy) »

The OEM kidney heads flow well yes, the ports are the same as the OEM open chamber head, the aftermarket kidney heads have the horrendous 4ZC1 port and core size so you port through the wall before you get to 185cfm!! The aftermarket open chamber heads have the OEM style ports, well the ones from 10 years ago did anyway! That's what mine is, China head from 2009, ported out but not wild as I only have 44mm intake valves in it. The OEM open chamber head we had ported to suit 46mm valves flowed over 230cfm @28 at 600 thou, the cam is a Tighe made billet that was ground by Surecam. It cost over $1200 to get done. There is another possible cam manufacturer getting involved in the next year or so, i'll keep you posted on how that goes, but that will be a current spec grind with a lot faster ramp but better dynamics, 99% of the Gemini grinds we have now were designed many decades ago. My plan is to get my head redone with 46mm valves and use the new spec cam..
GARAGE REDZONE sunshine coast ph 07 54433507

1975 TX coupe 4ZD1 efi turbo 10.787 @ 123/128
1977 TC Fashion Pack sedan draw through turbo
1984 TG PF60E dohc Group A racecar
1984 TG Panelvan
2006 Crewman SS 6.0
DR_GEM
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Location: 2196

Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by DR_GEM »

Sweet thank you. That’s interesting re the China heads. I can vaguely remember a post you made some time back about the kidney aftermarket heads being better than the open chamber heads - hmmmm

Great Info on the cam. Phil did mine but could only get 242 at 0.050” duration and 303 thou cam lift. Guess the billet gives that much more.

Mines got a 114LSA and slow ramp to go easy on valve seats and springs.

Keen to see results when you have them!

Mick
I wish i had something cool and witty in my signature
DR_GEM
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Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by DR_GEM »

Ps just checked my head flow sheet - 197cfm at 500 thou (inlet); 143cfm @ 450 and 500 thou lift on the exhaust

242 duration @ 0.050 on the inlet
249 duration @ 0.050 on exhaust

Hoping this will hold to 8000rpm with the s364sxe

Mick
I wish i had something cool and witty in my signature
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Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by EVL WON »

Hey Coxy

Nice thread!
Plazmaman are adamant that their G-series intake won't fit on the 4Z's. It's an expensive gamble to buy off photos alone.
Have you spoken to them about it? They think the distributor cap will foul, even although most of us now run without (CAS only).
“Horsepower makes you fast in a straight line, lightness makes you fast everywhere” - Colin Chapman
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redzone (coxy)
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Re: My green TX coupe, 4ZD1T 422rwhp vids page 15

Post by redzone (coxy) »

Yeah IDGAF about the dissy lol, mine runs the dissy housing but no cap, and i'll be going CAS/CAS when I start throwing money at it again!
GARAGE REDZONE sunshine coast ph 07 54433507

1975 TX coupe 4ZD1 efi turbo 10.787 @ 123/128
1977 TC Fashion Pack sedan draw through turbo
1984 TG PF60E dohc Group A racecar
1984 TG Panelvan
2006 Crewman SS 6.0
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