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The "what can I do to my 2.0L SPI" Thread

95923 Views 141 Replies 63 Participants Last post by  marclar
Okay guys, the 2nd gen 1.9L guys have a thread about what mods to do to their cars, so I was thinking we should have one too. I'll start:

1) 3.8L Throttle Body Swap

2) SPI Controller

3) Automatic Shift Improver (if you need one)

4) BDR Underdrive Pulley
(they stopped making them good luck finding one)

5) FC Shorty Headers
(they stopped making them good luck finding one)

and now if everyone adds one or two things our list will be insanely long.
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the spi crank has 4 extra counterweights and is way way way way more balanced than the 1.9. and by way more balanced i mean, its balanced period. the 1.9 crank is just cast and thrown in. buying new pistons is way more work and cost than its worth. the flow characteristics of the spi with its dome top pistons is perfect, especialy when the intake is slightly polished up. but not totaly polished up. the roughness helps atomize the fuel because of the randomness of the direction of flow. the spi is a verry strong motor stock. mine had about 55,000 on it and i boosted 17psi with arround 9.5-9.7:1 for 2 years before i decided to rebuild it for longevity purposes.

if anything, i would shave the head about 5 thousandths and call it good. the xtra compresion will give you better numbers all across the board.
what did you use for tuning ?
what did you use for tuning while boosting ? and what kind of fuel upgrades did you do ?
back then it was megasquirt 1 with edis. only other thing I changed was 42# green top injectors
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