408 stroker big cam surging at idle

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Dec 3, 2011 | 06:23 PM

zblubyu

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408 stroker big cam surging at idle

i just had a 408 stoker put in my zo6 and we did the fast 102 intake with the 92mm tb. this may just be a tuning issue but i cant get it to idle vary well. it wants to surge at idle. what might this be?

Dec 3, 2011 | 06:50 PM

DrkPhx

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From: St. Michael, MN.

More than likely a tune issue. Has it been tuned at all?

Dec 3, 2011 | 07:03 PM

zblubyu

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it has a break in tune on it. the lowest we could get it to idle is 1,100 rpm any lower it wouldnt idle without shutting off when letting of the throttle on a roll

Dec 3, 2011 | 07:32 PM

DrkPhx

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From: St. Michael, MN.

Quote:

Originally Posted by zblubyu

it has a break in tune on it. the lowest we could get it to idle is 1,100 rpm any lower it wouldnt idle without shutting off when letting of the throttle on a roll

That's real high even for a big cam. The tune needs work. What size cam?

Dec 3, 2011 | 07:45 PM

98hc4mula

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From: DFW

That is pretty high idle, I got my 408 idling at 825 rpm with a 244/244/ .610 113+3 cam it drives so nice due to countless of hours tuning it. Have the tuner work on it some more. and some more.

Dec 8, 2011 | 07:54 PM

RyanSws6

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I've had tunning issues about idle. I've had several tunners TRY! It pisses me off to drive it sometimes. WOT is like sex but slowing down a PITA. I think its a throttle cracker issue, seems to run too rich. I've heard my 102 TB is too big..etc...I'm considering going SD. I just can't keep throwing money at tunners. I'm going to try a BIG rice tunner. We'll see. Oh I did check EVERYTHING for air leaks and re tq'd the intake.

I would tell you to check for air leaks.