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Slow response during 1st gear...

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Old 02-18-14, 09:43 AM   #1
Damian96
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Default Slow response during 1st gear...

I have a 02, sc430. Modded with blitz supercharged and straight exhaust all the way..( accept the 2 catalytic converter before the o2 sensor.) but i have slight delay or lag during the first gear. From (rpm) 1k to 4k its delay or lag.(not revving smooth). But when its reach 4k and above, the power just kicks in suddenly. I hope you guys understand what im saying. Sorry for the bad english.
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Old 02-18-14, 11:03 AM   #2
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Do you have a dyno run with with AF? This is a tuning issue where any of a hundred factors could be the cause.

Also, make sure you disable the traction control too. The traction control is super super sensitive and will cut the engine without the traction light necessarily going on. I'm guessing though that you had to disable it as even the stock power is enough to lose traction if you slam the throttle wide open at a stop with cold tires. It will kick in even before losing traction and the light won't go on but you'll lose power.
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Old 02-18-14, 07:06 PM   #3
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Nope i didnt dyno it yet...but i think it doesnt require a dyno . I did switch off the traction control but its still the same. For me i think is the throttle body thats lag or delay. So may be it need a throttle controller?to reduce delay response. But my first gear wasnt revving that smoothly.
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Old 02-18-14, 07:38 PM   #4
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A dyno run with AF is always required when your adding forced induction. You could be leaning out causing detonation and ring land cracking.

Failing that, you can use a tailpipe AF sensor with a meter to measure your AF ratio under full load.
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Old 02-18-14, 09:11 PM   #5
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Get it dyno. You may just blow up your engine if you continued to run under 4k rpm,
sorka is right, you are running lean and you may not know it until you have it dyno and adjust your fuel pressure.
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Old 02-19-14, 02:10 AM   #6
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Okay i try to get it dyno. Thank guys...one question guys..do u think supercharged engine still need back pressure?
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Old 02-21-14, 01:28 AM   #7
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I just done the dyno today... The result is, i'm running lean during (rpm) 1k - 3.9k but when it reach 4k(rpm) it start to become rich.
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Old 02-21-14, 01:28 AM
 
 
 
 
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