sebbyxtc

iTrader: (7)

i thought only hondas can "chipp" their ecu's. Explain what you did to it? and also why didnt you tune with an FIC instead of the apexi?

RunictC

I made some calls today to some engine-building shops here in Houston. Got quotes of $700-$800 for instalation of pistons, and another $120 for boring(should I go with JE oversized).

I explained the options of either JE 11.0:1, or Toyo hybrid 12.5:1. All 3 sources told me that the 12.5:1 ratio pistons will most definitely cause detonation with even premium gas. I was warned only to use race gas with this compression ratio.

I spoke to a P&P specialist as well. He recommended that the combustion chamber be de-burred, taking all sharp angles away(but being sure not to take TOO much material as this would increase displacement and work against increasing compression). The sharp angles are spots most likely to cause detonation.

Question is, can this 12.5:1 compression ratio be a reliable option on pump fuel?? If not, forget your tC as a daily driver....

ESEMRFOZZ13

i would say with at least a piggy back for w.o.t., and 93 octane min. (calif. is 91) or 91 mix to raise octane in cal.

ESEMRFOZZ13

i think he just changed the signal to the rpm wire, wich would also send the wrong rpm signal.

Steventc07

You can't advance timing with the FIC.

jimmyjun

NOoooo, its not exactly like hondas that have a chip. its got something to do with changing some frequencies in the ecu so that in can rev higher. if some wants it done ill do it for $130 + shipping.

jimmyjun

[quote=RunictC;3947403]I made some calls today to some engine-building shops here in Houston. Got quotes of $700-$800 for instalation of pistons, and another $120 for boring(should I go with JE oversized).

I explained the options of either JE 11.0:1, or Toyo hybrid 12.5:1. All 3 sources told me that the 12.5:1 ratio pistons will most definitely cause detonation with even premium gas. I was warned only to use race gas with this compression ratio.

I spoke to a P&P specialist as well. He recommended that the combustion chamber be de-burred, taking all sharp angles away(but being sure not to take TOO much material as this would increase displacement and work against increasing compression). The sharp angles are spots most likely to cause detonation.

Soooo false. no detonation what so ever. there is a big path between thinking what it might happen and knowing whats the truth. ive done that mod in a few cars already and no detonation what so ever. no deburred head or anything like that, they are just trying to rip you off. cheers

jimmyjun

no it cant advance timing.......

RunictC

Thanks for touching on that, Jimmyjun. I'd like to think that our studry combustion chamber can handle the higher compression ratio.

Just to be sure, I'm gonna go with your setup, but with all sharp angles debured and with some type of treatment (cryo or nitride) for the combustion chamber and cylinder walls. Got any idea of which treatments are cost effective?

I read from different texts that toyota, honda, and nissan engines don't necessarily need to be treated due to their sturdy construction. I also read that you can achieve higher horsepower and better efficiency/wear with treatment.

jimmyjun

i dont use any treatment but if you want to go with nitride, is what most forged piston companies use.

RunictC

Ok, cool. I'll do some more research.

jdmsijerry

Will chipping the ecu throw a cel and is it reversible? I'm interested!

DeAnzaJig

Ok people are getting confused here. He only altered some signals from the rpm wire (as he stated) to increase the rev limit. You wont be able to change fueling in either closed or open loop, maf table or timing. Yes, this is a good way to raise the limiter, if it works, but not something to tune with.

In essence, its still "piggy backing" since your altering signals rather than re-programming the ecu. so this is nothing like a "chipped ECU" as people keep asking about.

dont get me wrong, i think thats a great deal, 130 for a rev limit raise. and he obviously took a great amount of time, trial and error to figure this out for people.

ESEMRFOZZ13

i dont see the need for this in n/a. power drops off before 6500 rpm, and if you were turbo then you would get some form of emu.

TCpete

you are some what right...this mod really only works on non stock tcs but CAN on a regular bolt on tc. With the right set up, someone will be able to maintain a steady flow of power and tq after the avg 5500 rpm drop off. ive done this to a few friends cars, but again its about having the right parts if not its a pointless mod. if you need 300 more rpms to make THAT much extra power then ur doing something wrong. (from my own trial and error)

example below of a steady power flow to 6500 on my old set up. (currently working on a new set up for the 2012 season.

DeAnzaJig

If you were supercharged it would make all the difference. But then again more boost woulf need some sort of management other than the reflash. Plus it would be great for anyone boosted with fic, because you cant raise the rev limit on the fic.

jimmyjun

its about having the right parts, camcon also really helps.

jimmyjun

pete i think if you had a intake manifold and bigger TB with something to control vvti like i do youll see power all the way to 6,800rpm.

ESEMRFOZZ13

that still lowers before 6500 rpm. im not saying for built motors, but rather bolt on parts.i've got tuned with all bolt ons and the most power is at 6250 rpm.