detonation?????

[fast_s13]

my car seems to have detonation at full boost..everything is stock on the motor xcept the walbro255 and the tomei ecu... also the car does not idle at 700 it surges back and forth and i have set th timing to 15 deg. the tps does not stay at .45 it jumps up and down a little... any ideas

[Nameless EJ6]

Is the ECU giving you a code?

[Joe]

i thought the 20 was supposed to be 10 BTDC timing? i could very well be wrong but i could swear it was...also if think you are detonating pull your spark plugs and check them for signs of detonation to be sure.

[Yellow4g63]

my car seems to have detonation at full boost..everything is stock on the motor xcept the walbro255 and the tomei ecu... also the car does not idle at 700 it surges back and forth and i have set th timing to 15 deg. the tps does not stay at .45 it jumps up and down a little... any ideas

Did you check for vacume leaks? That tomei ecu might have a very agresive timming map on it.

[Wulfgang]

Why would your TPS jump around? How much does it move from 0.45 V? If it is changing without your foot on the throttle, then something must be loose.

As for the detonation, you said it all.... you have a Tomei ECU. What octane was that tuned for?

[fast_s13]

it does it with the stock ecu just as bad as the tomei and all i run is 93 oct with oct boost

[fast_s13]

the tps goes between about .43 to .47 and the car will not idle at the same rpm

[Yellow4g63]

it does it with the stock ecu just as bad as the tomei and all i run is 93 oct with oct boost

Did you change the fuel filter before you did the swap?

[fast_s13]

yeah its all new

[Yellow4g63]

Damn I'm stumped. What do the plugs look like? maybe a injector isn't up to par and is making you go lean. Kick the timming back and see if it still dose it.

[fast_s13]

all the plugs have a red tint to them

[IvoryJ30t]

i would suggest you stop the octane booster.

its garbage. [all of it]

to make 100 octane, you would have to add 5 gallons of toluene to 10 gallons of 93 octane gasoline.

that 16 oz bottle of junk only raises the octane by .1 or .2 [ex. 93 octane- 93.1 octane]

also, that tomei ECU was most likely tuned for japanese gas, which is higher quality than US gas. japan gets 98-100 octane pump gas.

you might want to seriously consider ditching that ECU.

[fast_s13]

like i said it does it with my stock ecu

[frosti108]

i know. super old thread. i wonder what ended up happening though because we are having the same problem with a friends car