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L28 NA to Turbo rebuild


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#21 garvice

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Posted 26 June 2010 - 10:33 PM

Depends what sort of engine management/ignition setup you go with.
If you go distributorless ignition then you are doing away with the usual reason for having a distributor and probably only using it as a CAS. If you keep the distributor then yes you do. Or you could get a distributor that does not have vacuum/mechanical advance and just control it from the computer.

#22 pauly_adams

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Posted 27 June 2010 - 11:27 AM

You can always use a turbo dizzy but there a bit hard to come by they have no vacume or mechanical advance

#23 1979ZED

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Posted 27 June 2010 - 02:35 PM

does turbo dizzy = turbo ecu or can you use the turbo dizzy with the standard ecu?

#24 pauly_adams

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Posted 27 June 2010 - 06:44 PM

you need the turbo ecu from what i have read. thats why locking the standard dizzy seems a good alternative

#25 1979ZED

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Posted 27 June 2010 - 07:46 PM

ok cool thanks.

When you get around to doing yours can you let me know how you went about it. I am still a while away from the engine part of my project.

#26 Six_Shooter

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Posted 08 August 2010 - 12:00 PM

Locking the dizzy is pretty easy. Just find where the rotor attachment pivots on the main shaft and weld it together. If I get a chance I'll look for my old dizzy that I used before I swapped to DIS, and take a picture of what I did.

I also used a Delco ECM (factory GM), to run my turbo L28 conversion.

So far by trap speed calculations I was at about 200 wheel HP, and have only improved since then. Somewhere around 150 rwKw if I remember my conversion correctly. This is non intercooled and around 10 PSIG on a stock P90/F54 N/A combination, with an N47 intake, modified for 14mm O-ring injectors.

#27 peter mc

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Posted 08 August 2010 - 04:39 PM

hi  performance ignition service make a distributor  that uses a rb30 cas . i use it with all my builds with haltech platinum sports 2000 ecu  it can be ran with 6 ls1 coils .or 1 coil .

#28 Scando

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Posted 10 August 2010 - 12:12 PM

We grafted a complete RB30 distributor onto mine.  took a fair bit of machining but it works well now it's on there.

#29 peter mc

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Posted 10 August 2010 - 06:23 PM

yer 600 dollars from scorcher in melb . they make billet distributor with rb30 internls

#30 DatPilot

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Posted 13 August 2010 - 01:29 PM

With the dissy, would just disconnecting the vac line to the diaphragm stop it advancing?

locking the dissy is something I completely forgot about....

#31 PZG302

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Posted 13 August 2010 - 02:15 PM

With the dissy, would just disconnecting the vac line to the diaphragm stop it advancing?

locking the dissy is something I completely forgot about....


No because the dizzy also has mechanical advance, hence you need to lock the actual distributor body as described previously.

In my NA race motor I don't run vacuum advance, just mechanical, and have had the dizzy regraphed to suit the motor, that is the amopunt of advance is modified from standard by adjusting the amount of movement available.

#32 DuganZ

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Posted 01 October 2016 - 11:45 AM

In case anyone is reading this thread, i found this link very useful to understand whats going on, and gave me a better idea on how to lock the dizzy.

 






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