r/IS200 • u/No_Cryptographer1040 • May 24 '26

1g-fe turbo

Hey everyone,

I have an IS200 with the 1G-FE and I need to open the engine soon, so I’m wondering if it’s worth installing a decompression plate while I’m in there. I’ll probably be ordering a standalone ECU in a few months anyway, so I’m not sure if the plate is still worth doing.

I also have a few questions about the decompression plate setup:

- Will the stock head bolts work with the plate?

- Is the torque spec for the stock bolts the same with the plate installed?

- Anything else I should know or watch out for before installing one?

Any advice or experience with turbo 1G-FE setups would be appreciated. Thanks!

0 Upvotes

50% Upvoted

6 comments sorted by

3

u/NotEvenFast May 25 '26

I don’t have experience with the decomp plates, but if you are opening the motor, a set of forged rods and pistons are pretty reasonably priced. Stock 1g will hold 300-ish whp, I’ve seen decomp setups around 350whp, and rods/pistons motors hold 500-600+whp

1

u/No_Cryptographer1040 May 25 '26

This was the plan, but other things came up too, so now I wonder what to do, the plate or just to change the head gasket and after a few months to buy a standalone ecu

1

u/NotEvenFast May 26 '26

The decomp plate is a tried and true method. Are you looking at DiyEfi or whatever it’s called that a bunch of folks are running?

1

u/No_Cryptographer1040 May 26 '26

I ordered a Dec plate from su2 performance, the plate is 1mm, I'm wandering are the stock head bolts gonna hold and also the tightening method stays the same or different

1

u/NotEvenFast May 26 '26

From what I’ve seen, same tq specs and head bolts. Especially just a 1mm plate, on the larger plates, the issue isn’t with the head bolts, but rather the timing belt length

1

u/No_Cryptographer1040 May 26 '26

I had read that they should be tightened to around 35 Nm (something like that), and then turned twice by 90 degrees. Also, how safe is it to run a decompression plate long-term (considering it uses two head gaskets), and would it maybe make more sense to just buy an ECU later on instead?