Hey guys, I am sorry ahead of time if this seems like a noob question but I cant seem to find an answer in the forums. I have just installed a skunk 2 intake and 70MM throttle body on my b20. I know 70mm is excesive for a N/A but it was free so I figured why not. Now to my issue, car runs and drives great but if I stomp on the gas it will bog down significantly, if I ease into full throttle then its fine and will smack 7k rpms no problem, and at 99% throttle it also runs smoothly, it is only when I immediately put the pedal to the floor. Could this be because of the bigger throttle body and intake WITHOUT a tune? I am assuming this is the reason. I have also checked for vacuum leaks and found nothing.

 

Also if this is the reason is it okay to drive it for the time being? or will it cause various other things to be thrown off? thanks for any help/suggestions they are greatly appreciated.

 

Adjust tps?

 

heres the thing with that, and this makes me think the tps is the issue. The ild tps was totally broken. I saw that once I took it off to swap Throttle bodies, however it ran absolutely perfect before hand. Regardless I got a new one and hooked it up. When trying to calibrate it the voltages to the wires were waaaay off. Im talking -.05 volts and didnt change much at all when holding throttle wide open. So I was like fk it lets see what happens, started car and it ran great idles flawless accelerates great. Its just this bog down when u completely stomp on the gas. So im assuming now this is a TPS issue?

 

Why ignore this^ obvious problem?

 

Is there a reason for it? Any help about the issue? I know its wrong.. but im not sure what to do about it, considering the old one was totally broken but the car ran beautifully. idk if its possible that the previous owner tuned it to run of a map or something? I read in a forum on here some people have done that. I know very little about any of this and learning/researching as I go so again sorry for the lack of knowledge on the subject.

 

Its most likely a tuning issue, What ECU/EMS are you using?

If you have hondata S300 you can set the TPS very easy with your lap top. Im not familiar with other EMS but im sure they have a similar feature to set tps.

Get a decent base map burned to the ECU/EMS and then drive it. Until then don't stomp on the throttle without a safe tune, contact Pheriable.net for a base map, and look into further tuning the car if you feel the need. Usually there base maps are spot on and good enough to drive/race on. You have options to send them data logs to further tune it or just find a local tuner.

 

Unplug the TPS sensor.

Turn key to ON(II).

In the wire harness connector, measure voltage between the Yel/Wht and Grn/Wht wires. Do you measure 0.5V?

If you don't measure 0.5V in this test, measure voltage between the Yel/Wht wire and the battery ground post. Do you now measure 0.5V?

 

If the voltage doesn't change when you move the TPS, it is possible that you didn't get the sensor pointer properly indexed within the throttle shaft tabs inside the opening of the T/B. Make sure that is correct and recheck your TPS voltage.

 

Just an FYI:

The wires I suggested that the OP test are for the input reference voltage from the ECU (Ye//Wht) and ground from the ECU (Grn/Wht). Therefore, the OP should not see any changes in voltage when the throttle plate is moved.

 

wow thank you!! So much great information I really Appreciate it!!

 

Absolutely... and I am well aware. I wasn't negating your testing process (because it is a proper one), but in fact offering another solution that only requires a screwdriver or torx bit to check. Some home mechanics have limited tools... a multi-meter or volt meter is rarely part of that limited tool set.

 

I too think that both tests (yours and mine) are worthwhile.

Unfortunately true, but not for the OP.

 

awesome thanks guys been super busy will be doing all this tomorrow I will post update! thanks again