Forged rods?

[HiBoost TS]

Lowering the compression ratio does not affect the RPMs at all. The gas mileage is not even noticeable and yes, you can lower the compression by working the head, but is not recommended. Any work to the head is forever and I would not change the design made by expert engineneers. With pistons you can go back if you want but if you work the head you need another one $$$$$.


Juan

 

[Spooled]

The redline is set by the ECU, and I don't think there is such a thing as a CR sensor. So no, CR will not affect the redline.

Can't you also lower the compression ratio slightly by porting the head(the combustion chamber side)?

Oh and I would wager that the 8.5 CR causes gas mileage to take a nose-dive, am I right?

The gas milage won't be affected "a lot" by lowering the CR to 8.5, but it may take a dive because of how you'll drive it with the extra room for boost! Zooom! Psssssshh... ballalalalaa

 

[hello2000]

What I meant by changing the redline was, can I go further then what the redline shows. Ex. stock redline 6500 -- change to 7000 and be safe

 

[bill harvey]

yes it should allow you to run more rpms, in fact it is the rpm that puts more stress on the rods than the boost does.

What I meant by changing the redline was, can I go further then what the redline shows. Ex. stock redline 6500 -- change to 7000 and be safe

 

[bill harvey]

Hi Boost: how much for the kit with the 8.5:1 pistons

 

[jeffmsp]

bump for price, 8:5:1 pistons and rods with everything else you where saying.

Question though, will I still be able to use the stock ECU with the lower compression (yes I know get standalone but i would rather wait until spring when I could afford to do both) or will the car run like junk?

 

[1FASTMSP]

bump for price, 8:5:1 pistons and rods with everything else you where saying.

Question though, will I still be able to use the stock ECU with the lower compression (yes I know get standalone but i would rather wait until spring when I could afford to do both) or will the car run like junk?

why would the car run differently with the stock ecu? i know it will have less power, but should it run differently? this would be good to know...

 

[Spooled]

bump for price, 8:5:1 pistons and rods with everything else you where saying.

Question though, will I still be able to use the stock ECU with the lower compression (yes I know get standalone but i would rather wait until spring when I could afford to do both) or will the car run like junk?

I think it would be totally drivable with the stock ECU, but the timing may be off for optimal power (not like it's optimized from the factory or anything). With a lower CR, you can advance the timing more if you keep the boost levels the same. This is because the less compacted mixture will burn slower.

 

[jurgs01]

why would the car run differently with the stock ecu? i know it will have less power, but should it run differently? this would be good to know...

It depends if your pistons are the same weight as stock.