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Dyno Tuned K20a with bolts-ons got new cams/12.5:1 what to change in tune for safe start up?

Posted: Fri Sep 26, 2025 1:57 pm
by Mlyno
Hey

I got my jdm k20a type-r dyno tuned with bolt ons - rdx injectors, fuel pump, exhaust, intake, tuned with 50 vtc
Now i rebuild the engine and added a Toda A3 cams, 12.5:1 pistons, RRC manifold, VTC mechanicaly limited to 40,(injectors and pump didnt change).

What do i have to change for SAFE start up after i build this engine? + Drive around get aligment etc
Vtc is mechanically limited to 40degree, so it will not smash valves.

I gonna get proper dyno tune in the spring, just need the car to start and move around and drive for couple days before winter storage.

Re: Dyno Tuned K20a with bolts-ons got new cams/12.5:1 what to change in tune for safe start up?

Posted: Fri Sep 26, 2025 2:05 pm
by Spunkster
Talk to your tuner they should be able to help you with a calibration to start it up with.

Re: Dyno Tuned K20a with bolts-ons got new cams/12.5:1 what to change in tune for safe start up?

Posted: Fri Sep 26, 2025 2:47 pm
by Mlyno
Yea, thats why i posted here in calibrations subforum, as somebody might suggest something.

I dont want to pay 400$ for a temporary startup tune, if i do custom dyno tune soon anyway.

Re: Dyno Tuned K20a with bolts-ons got new cams/12.5:1 what to change in tune for safe start up?

Posted: Sun Sep 28, 2025 4:48 am
by MondeCruel
Just to move i think it would be safe with your current calibration if you drive slowly in non vtec and monitor any knock and afr is in a acceptable range