Can a Apex'i multichecker LOSE precision? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*HaLo* · 04-01-2005, 09:24 AM

Just a quick question...
Can a Apex'i multichecker LOSE precision?

I am asking this because I took out my 240sx with new engine and T25 turbo in the last few days and I have been getting some interesting readings. While my speed, rpm and timing do not seem off, my car has been making CRAZY power at 7psi.

Last year, on my T28 with 15 psi, the maximum reading I had managed was around 285ps and my dyno run at 15.5 psi gave me 283.7whp. So we can assume it's precise enough. The Apex'i harness is welded in my current harness, and it has not changed. The engine and turbo did change though.

Yesterday, I read peaks at 321ps and 298ps, the day before, 317ps, all at 7 psi with ~40F outside temperature. The car does feel quite powerful, but my butt dyno cannot be accurate, since I haven't drive my car since August 28... So could the Apex'i multichecker lose precision?

Anyways, I'll be putting the car on a dyno in the next few weeks to see. Hopefully, we'll get a good reading of this.

*HaLo* · 04-01-2005, 12:55 PM

Forget it guys, I found the problem.

vegita319 · 04-01-2005, 01:24 PM

what was the problem

?

*HaLo* · 04-01-2005, 02:44 PM

I'm almost sure it's in the multichecker computer setting. I had a retuned ecu that would read off the original Z32 signal but now, it reads of a modified Z32 signal that is sent to a stock ECU. I did not make the changes on the Multichecker settings. I'll try that and see what it does..

Anyways Air flow was way off compared to my SAFC...

04-01-2005, 09:24 AM	#1
HaLo from Canada, eh! Join Date: Sep 2001 Location: Montreal, Quebec Age: 46 Posts: 5,201 Trader Rating: (0) Rides Gallery: HaLo Feedback Score: 0 reviews	Can a Apex'i multichecker LOSE precision? Just a quick question... Can a Apex'i multichecker LOSE precision? I am asking this because I took out my 240sx with new engine and T25 turbo in the last few days and I have been getting some interesting readings. While my speed, rpm and timing do not seem off, my car has been making CRAZY power at 7psi. Last year, on my T28 with 15 psi, the maximum reading I had managed was around 285ps and my dyno run at 15.5 psi gave me 283.7whp. So we can assume it's precise enough. The Apex'i harness is welded in my current harness, and it has not changed. The engine and turbo did change though. Yesterday, I read peaks at 321ps and 298ps, the day before, 317ps, all at 7 psi with ~40F outside temperature. The car does feel quite powerful, but my butt dyno cannot be accurate, since I haven't drive my car since August 28... So could the Apex'i multichecker lose precision? Anyways, I'll be putting the car on a dyno in the next few weeks to see. Hopefully, we'll get a good reading of this. __________________ -> HaLo Race Car: '98 E36 BMW M3 Daily Drivers: '23 Audi Q4 e-tron & '13 VW Touareg SOLD: 01 GPW Honda S2000 PARTED: 93 Pearl White 240SX LE Fastback w/SR20DET SOLD: 93 Super White 240SX SE Convertible w/Silvia Front

04-01-2005, 12:55 PM	#2
HaLo from Canada, eh! Join Date: Sep 2001 Location: Montreal, Quebec Age: 46 Posts: 5,201 Trader Rating: (0) Rides Gallery: HaLo Feedback Score: 0 reviews	Forget it guys, I found the problem. __________________ -> HaLo Race Car: '98 E36 BMW M3 Daily Drivers: '23 Audi Q4 e-tron & '13 VW Touareg SOLD: 01 GPW Honda S2000 PARTED: 93 Pearl White 240SX LE Fastback w/SR20DET SOLD: 93 Super White 240SX SE Convertible w/Silvia Front

04-01-2005, 02:44 PM	#4
HaLo from Canada, eh! Join Date: Sep 2001 Location: Montreal, Quebec Age: 46 Posts: 5,201 Trader Rating: (0) Rides Gallery: HaLo Feedback Score: 0 reviews	I'm almost sure it's in the multichecker computer setting. I had a retuned ecu that would read off the original Z32 signal but now, it reads of a modified Z32 signal that is sent to a stock ECU. I did not make the changes on the Multichecker settings. I'll try that and see what it does.. Anyways Air flow was way off compared to my SAFC... __________________ -> HaLo Race Car: '98 E36 BMW M3 Daily Drivers: '23 Audi Q4 e-tron & '13 VW Touareg SOLD: 01 GPW Honda S2000 PARTED: 93 Pearl White 240SX LE Fastback w/SR20DET SOLD: 93 Super White 240SX SE Convertible w/Silvia Front

04-01-2005, 01:24 PM	#3
vegita319 Zilvia Junkie Join Date: Aug 2004 Location: Long Beach, CA Age: 39 Posts: 460 Trader Rating: (1) Feedback Score: 1 reviews	what was the problem ?