so anyways no time like the present!
The car is a TG Gemini Sedan with a holden straight 6 and trimatic fitted to it and in recent times a turbo has been added to it and this was originally a purpose built drag car, but i have also as some of you might know been in other events including a hillclimb just recently
onto the build.
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front brakes are vt commodore twin spot calipers and there is also a XA XB ? master cylinder in it to cope with the extra oil needed for the larger brakes.
So originally i had a naturally aspirated 202 on methanol EFI and it made 200hp at the wheels like that and i managed a best of 12.78 over the 1/4 mile, and i had planned to put an LS1 in place of the 202 but it really was just going to be a mission and cost a lot to get it to go much better, so i decided on an original thought of a turbo 202 and here we are
its still methanol fed and currently runs 16psi boost.
the fuel system in the boot is basically a low pressure lift pump feeding the surge tank then a bosch 044 efi pump and fuel cell to top it all off.
i have a rising rate regulator that i plan to fit shortly after the hill climb showed the new motor is running out of fuel in the high rpms with injector duty cycle getting to 100% but i should be able to get a bit more capacity from the 80lb injectors with increased pressure under boost! (keep in mind you use 2.3 times more methanol than you do for petrol)
the motor is backed by a rebuilt V8 trimatic that so far is working fine after having some minor teething issues with it when i first put boost into it!
to date with the first turbo motor i was able to get an 11.76 @ 118mph over the 1/4 mile and subsequently blew the head gasket on this run just before the finish line, so i have rebuilt the motor to the one pictured above with a more boost suitable cam and hoping to edge ever closer to a 10 second pass!
The efi is controlled by a Delco 808 computer (vn commodore etc) and it works fine for the most part, but when you hit the rev limiter in it, it actually cuts fuel and I wasn't really keen on this for boost as it would surely end in tears, so I have since added an ignition module made by VL400 from delcohacking.net and it interfaces with the delco to control spark via the computer still but also allows me to trigger the ignition module with this 36 - 1 trigger wheel and holden commodore abs sensor.
having this on the system has also given me the ability to run an LSx coil, and currently the motor is running on 1 x LS2 coil and plans are shortly to add the other 5 coils (when time and money permits) and then I will be able to remove the distributor all together!!
this also has the advantage of having a 2 step rev limiter in it and it cuts spark for the rev limiter instead of fuel so should keep things nice and safe I hope!
I dynoed the original boosted motor to test this ignition was all working properly and I had a fouled plug and was running on 5 cylinders and still made 289hp at the wheels, so hoping with 6 cylinders working and the new motor should be getting a lot closer to 400 at the treads!
i'm sure theres a lot more I have forgotten but I hope you guys enjoy it, I know I sure do
