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Lets hear some comments about the D17 with high compression. The new R18engines have 10.5:1 which is kinda high but I guess that's how honda achieved the 140hp. Who has high compression on their D17 and how do you like it. I have a set of CP 11:1 pistons for sale and would like to get some reviews about the power gain of running high compression on the D17's. Of course we know this would only be possible with tuning....

 
Rep Power: 278

Didnt you have a high compression with Stage3 cams, pistons, and other parts, before you trashed your 7thgen?

 
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yep sold it out. As a matter of fact Andyman bought the cam just the otherday. But I have not seen anybody with all motor setups. so just wanted to see what others had to say about all motor D17.

 
Rep Power: 302

I am getting ready to ordered 12:5:1 pistons but not sure if that is high enough for all motor what u guys think?

 
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anything higher then 12.5:1 and you'll definetly have to run race gas. 12.5 you can still run pump i believe, but definetly high octane

 
Rep Power: 296

People have run 13:1 pistons on pump gas in k20's. It all really depends on the tune and how good your engine management is.

 
Rep Power: 302

I plan on running 93 octane and theres a gas station that has 94 here. I am not sure but its sunco

 
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ok well i just ordered a custom crankshaft, pistons 12:5:1 custom, rings custom, rods custom, low friction bearings and sleeves

 
Rep Power: 282

Good luck with that setup man keep us posted with the driveability after install. Will the stock ecu handle that high compression or do you have a standalone EMS?

 
Rep Power: 302

I am not sure what do u recommend i was going to get a emange but i want to know what u guys think

 
Rep Power: 282

Emanage minimum bc ull def have to adjust ignition timing.

 
Rep Power: 302

is there anyother program i should use that is better?

 
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ronaldo9 rep +1

 
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What size bore are you going to do civicman?

 
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i got 76mm pistons not sure the bore he is going to send all the specs what i need to take it to a machine shop. What bore u guys think?

 
Rep Power: 282

PCS-XFC might be another fuel management option. They don't have ignition timing as of yet but it does add fuel for the turbo guys to prevent detonation. It's def got hella more features then a VAFC-2. My buddy just bought one for his ES1. He doesn't have a turbo kit yet but I can let you know how the car drives with it with a stock setup.

 
Rep Power: 302

let me know how ur buddy likes his

 
Rep Power: 812

d17 + higher compression = blown headgasket. i ran 200psi (stock is 135) for a year tho before it gave up. motor cant handle all the extra few hp.

 
Rep Power: 282

Gearbox do you think that if you adjusted your ignition timing though the head could have lasted because depending on when the cylinder charges couldn't you potentially lower the pressure by changing the timing of the valves (I'm guessing advancing to minimize the "bang"). I'm no expert this is simply a guess.

 
Rep Power: 812

ignition timing is automatically adjusted by ecu. cam timing i did get tuned and well it prolly made things worse. it was dyno at -1.5 degree at one point i was making 104whp and the car did feel faster than stock, but most likely all of that was from hi compression. also ran 89 octane. the coolant passage are just too thin so the head just couldnt hold itself together. if anyone gets headwork, i would suggest not shaving the head at all.

 
Rep Power: 302

gearbox i had headwork done and i did not shave it at all. My dads friend owns a perforance shop and he is goign to tune it and he said the exact samething do not shave the head but shave the top of the block.

 
Rep Power: 302

update pistons will not be done for 5 weeks and so will probaly have nothing till christmas