Mis-information FTL....

[float_6969]

So, as some of you may, or may not know, I have custom pistons in my motor. I increased the compression with custom forged pistons. I did this because I never intended to run lots of boost or make lots of power, and I wanted to gain some low end grunt and increase my TQ ratings across the board.

To do this I did some research inregards to the compresssion ratio (CR) of the CA18DE found in the Pulsar. What I found, 3 years ago when I built my motor, was that the CR of the Pulsar was 10:1, except in 89, when it dropped to 9.5:1. So I found someone who had a piston from a USDM CA18DET from an 89 Pulsar.

I sent the piston off to CP, and told them to put that dome on the CA18DET piston profile they had in stock. A few weeks later I've got my shiny new pistons and I put the motor together.

Then I tried tuning it. Since this was my first attempt at tuning, I assumed the trouble I was having trying to get it to not detonate was from me being a newb. I knew the extra compression would require more fuel and retarded timing, but I was running AFR's in the mid to upper 10's and total timing of 5-8° at 15psi.

Tonight I just discovered that ALL USDM CA18DE's had 10:1 CR. and that I screwed up big time when I built my motor 3 years ago.

That also explains why this motor still makes the power that it makes with the excessive fuel and heavily retarded timing.

Maybe I'll do a write up on a Natural Gas conversion. 120 octane, here I come!

[Bwana]

Ouch man. I guess it helps with the off boost performance though!

[float_6969]

Yup, helps with spool time too!

[r34 gtr]

So not really misinformation FTL, but misinformation FTW, right? If it runs well enough with 10:1 compression I think you win.

[float_6969]

It runs fine, but not well on pump gas.

[r34 gtr]

And your point is?

[float_6969]

Tim's mom is easy?