c5z lightweight flywheel retune???

[WIKU]

hello, i just installed a mccloud rxt with the lightweight flywheel. the car has a hard time idling sometime, and stalls out alot,.
the car was tuned when the cam went in, and its never had a problem. ( several years ago)
car has a small cam, 224-230,
all the bolt ons.
it made 420 on a dyno jet back in the day when it was tuned.

i bought hpt last year, but never used it on the car.

my question is what parameters need to be changed or adjusted..
thanks

[WIKU]

?? anyone???

[AdsoYo]

I have a light weight flywheel but I've always had it so I don't know exactly what needs to be changed to account for a lighter flywheel. This thread was just posted with some relevant information: http://www.hptuners.com/forum/showth...weeper-HT-tune

[WIKU]

thankyou... this is going to be fun..

[Higgs Boson]

If Idle Airflow, MAF and VE were all correct before the install, all you should need to adjust is Cracker and/or Follower

[JasonS5555]

Yes. When we installed the Jerico, 110 tooth FW, and 7.25" clutch in the '98 we had to change the follower, cracker, and also the overspeed and underspeed spark tables. Here is a snip of what we did:

increased the idle rpm to 950
set idle airflow using Patrick K's method
decreased the overspeed and underspeed timing tables by about 60%,
reduced the amount of throttle cracker air (less inertia to spin up)
increased the throttle follower decay (again less inertia)

For our purposes, autox, we zeroed the cracker above 16 mph and 2800 rpm. The amount you decrease that table and/or where you start the zeroing would relate to how much inertia your clutch/FW combo has. For the decay, we maxed that value out above 26 mph and trippled it elsewhere.

It really isn't that bad. Just start mulitplying the hole tables above by the percentage you want to increase or decrease. If you go to far, the car will start to stall when you roll up to a light in neutral. If it does, back it off. If you're still getting some "cruise control" feeling or revs hanging, you need more.

Hope that helps,

[WIKU]

Wooooo. Thankyou gents. Much appreciated.

I will give her a go asap