John02SS

iTrader: (47)

Just installed a TR224/112 and have a slight surge at anything under around 1800 rpm. I have a custom tune from Diablo with some timing added at idle, idle speed set to 825-850, and the throttle follower tables tweaked. Does drilling a hole in the TB blade help the most with this or will working on the VE tables take care of it? Thanks guys!

John

Cal

iTrader: (1)

Sounds like you have already done everything you need to; drilling the TB won't help unless the IAC's are maxed out under this condition. There will always be more surging with an aftermarket cam than there was with the stock one; you will get used to it.

John02SS

iTrader: (47)

Thanks for all the help Cal! I really appreciate it. The car may just need some learn time also. I put about 30-40 miles on it last night after the install and about 20 on it this moring. Changed the oil, heat cycled the springs two times with some spirited driving after the first one (5K), and now it is time for 8 AM drive to work traffic!

Slowhawk

iTrader: (12)

A surge can be normal in 1st gear under that rpm.If it's all gears there is a tuning prob.I would check IAC's,then L-terms and timing.

John02SS

iTrader: (47)

What should the IAC's read? I know the ltrims are running around +3 and hanging at +1.56 at WOT and they are being adjusted. Thanks Slowhawk!

John

Cal

iTrader: (1)

It doesn't mater what the IAC's are as long as they aren't hitting the end of the range on either the min. or the max. I think the range is zero to 128. Alot of people try to get them around 40 to 50 at idle with the A/C off and the motor at operating temp. That way it has some room to go under higher demand like fast idle or with the A/C on.

Also, if you are running too much ignition timing, it can make the engine surge a lot.

Cal

iTrader: (1)

No, I just checked on that, the high end of the range is really 256, but I don't think you get much more air that high, better still keep the max down around 128.

John02SS

iTrader: (47)

Cal,
Did you drill your TB? I don't think the timing is too high as I only added 2 degrees from 400-1000. The car is insanely rich at idle. Will adjusting the VE tables take care of most of that? Starting out with 65-75-85. Waiting on Diablo to do it for me.

1fastWS6

iTrader: (3)

I have the same cam on a 114ls and mine is VERY rich also at idle. I even have the VE scaled down 70-80-90% from 400-1200. When is was scaled down further, the car surged more and had a slight hesitation starting off. My timing tables are currently stock. My idle is set at 850rpm, and my TB hole is drilled to 3/16" (IAC counts are around 35 warm).

I would think adding some timing may halp make a more complete burn at idle reducing some of the rich smell?

John02SS

iTrader: (47)

My car is so rich at idle that it will smoke a little on occassion. It's all fuel too! Usually after running it hard and coming back to idle. Any of you guys experience this?

1fastWS6,
Thanks for the info buddy. I drilled my tb to 3/16 early this morning and I'm waiting on Diablo to get the software needed to scale the VE tables. When you scaled the tables down did it affect your LTrims any? Thanks!

John

HumpinSS

iTrader: (1)

http://www.ls1tuning.com/iboard/index.php?showtopic=9

Slowhawk

iTrader: (12)

VE and timing tables will ussualy get rid of rich smells.You want to set the timing so it doesn't bounce around.

John02SS

iTrader: (47)

Thanks Slohawk! Is the little bit of smoke normal until I get the VE tables taken care of?

tuff

iTrader: (15)

I looked at my edit file and my timing is set stock at idle. I would tweak the injector flow rate table a little for the ltft being a little rich. And check the iac it should be around 50. just sounds like you need some idle tuning.I have a pretty big cam and with the right tune you should loose the surge.

1fastWS6

iTrader: (3)

Which table do I need to add timing in? Is it the High Octane, Low Octane, Base Spark in Drive, or Base Spark in Park tables?? When does the PCM use the Base Park and Drive tables anyway for an M6 car? And, since my idle is at 850 rpm, would I just add timing from 1000 rpm and under?

TIA,

Cal

iTrader: (1)

For my TR224 114, I drilled the TB blade out to 1/4 inch. Two degrees isn't too much to add to the idle timing. For the rich idle, keep lowering the VE 1200 rpm and below until it starts to hesitate, then go back one step. But let me say this, with your cam you will never totally get rid of the rich smell. The cam intake/exhaust overlap causes this. Raising the idle speed to 950 rpm will help a number of these issues also.

WS6FirebirdTA00

iTrader: (33)

can anyone explain surge to me?

Slowhawk

iTrader: (12)

base spark park/base spark drive
400=18 degrees
800= 24 degree's
1000=24 degrees
1200=24 degree's
1600=28 degree's
1800=30 degree's
2000 and up=34 degree's

Do the whole columns.

CAT3

iTrader: (9)

John, how are you verifying that your rich, other then the occasional smoke? I have predator tuning, surge in P/N only, and hook it up to my wideband, it is stocihly perfect 14.7:1, smells rich as hell due to the CATs that went away. Also, I get the occasional smoke from the engine going rich as I shut down, coming down from a higher rpm to idle quickly then off, startup and puff.

food for thought

John02SS

iTrader: (47)

CAT3,
The fuel smell is bad and it acts up at idle when it starts smoking. It has gotten pretty bad though. It would have to be rich with that much smoke. I can handle the occasional puff or two, but it smokes pretty good at times.

Thanks for all the inof guys!