malibud Posted October 27, 2015 Share Posted October 27, 2015 I just acquired a 82 l28et Looks to be very clean and rebuilt but it has a blown head gasket. The engine was tuned and running good until the PO tuner up the boost on the manual controller and blew the HG. It is running a trigger wheel set up with a ford coil pack. 440? injectors, Megasquirt 2 3.3.0 extra. 3"exhaust everything need except wide band.. Presently I have a 240z with a L28 zx with flat tops and SU carbs, STI diff closed ratio 5 speed Question: It would be easier for me to bolt on manifold tap oil pan and wire the the flat top piston motor that is in the car. I am a newbee to MegaSquirt and figure I really don't want to mess up a good tune. So ... Is the tune so specific to the engine that I should just replace the head gasket a go with the turbo motor and dished pistons or ... Go with turbo the flat top engine for good response down low, will the tune be really off ? Side note I have another z that has a JWT Ecu dish pistons etc. But non tune-able, so I familiar turbos but like to tinker and learn MS. I thought my carbed car my be more fun with flat top pistons and a smaller turbo it might be a fun autocross car Thanks for any advice ... Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted October 27, 2015 Share Posted October 27, 2015 Use the turbo motor and let someone else tune it? What head is on the carbed engine? Quote Link to comment Share on other sites More sharing options...
malibud Posted October 27, 2015 Author Share Posted October 27, 2015 Sorry the MS is tuned for a f54/p90 block/ head sitting in my garage with a blown head gasket. I have a f54/p79 combo with flat tops in my car now with carbs. I thought I may just take the parts off the turbo motor and put them on the na motor but didn't want to mess up a good tune because of the piston difference. I figured a flat top motor with 7psi would be fun on the low end. I believe the heads are the same other than the exhaust liners ? Quote Link to comment Share on other sites More sharing options...
frodriguezvsi Posted October 27, 2015 Share Posted October 27, 2015 the Turbo F54/P90 combo with Dish pistons will lower your compression which is best for turbocharging and Flat pistons will raise your compression and bad for turbocharging high boost.Every block/ head combo is going to need tweaking of the MS tune. Quote Link to comment Share on other sites More sharing options...
Bernardd Posted October 27, 2015 Share Posted October 27, 2015 You can tune the jwt ecu with nistune software and board or emulator. Quote Link to comment Share on other sites More sharing options...
malibud Posted October 27, 2015 Author Share Posted October 27, 2015 I liked the keep the JWT car like it is I am real happy with it, Just like to tinker probably just stick with Frod and go with a new HG on the dish piston motor . and keep the mega squirt DC Quote Link to comment Share on other sites More sharing options...
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