My v6 Drag Week build

[Ondonti]

I had problems balancing Racing with letting off gearshifts and getting full fuel when boost came up. Increased Accell enrichment with TPS and then it killed low throttle accell (rich misfires).

[87turbodance]

Before I change much, I thought I might try changing some of the filtering calibrations.
Any thoughts on the lag filter number? MAP sample window? MAP sample angle? Number of sample events? (Currently 50, 10, 40, 1)

I need to read through more of this thread, but it does sound like my problem.
http://msextra.com/forums/viewtopic....filter#p312130

I saw that thread but I haven't had a chance to read though it yet.

I also haven't had a chance to educate myself on the different values that can be adjusted with the filters so I have no clue about them right now.

[c2xejk]

I adjusted the cals for the MAP filtering and the MAPdot seems to be more stable. While it is a little early to declare the problem fixed, during some limited driving the problem didn't occur.

[Sundance 6g72]

yeah ill wait until you drive it a bit more before i agree that its fixed. sometimes i would do a fix that would seem to help and then 2 days later its not helping (adding fuel, pulling/adding timing, etc)

your fix sounds promising and more on top of whats going on than what i was doing.

[c2xejk]

After 5 days of driving the car, I think I can safely say the problem is fixed.

Next up, installing the air bags in the rear springs.

[87turbodance]

That's great to hear! Could you go into a little detail about you changed?

[c2xejk]

I set number of sample events to 4 and set the MAP lag filter to 40.

I may yet try one of the new firmware versions that has the MAP averaging algorithm. Not sure if I will do it while it is still in alpha or wait till it is beta or released...

[Sundance 6g72]

COOL! ill try doing that as well. It makes sense i had a very similar problem because i started my tune from your tune!

has me excited.. the stupid miss fire feeling thing at 2200-3000rpms was my only hickup with my tune... and i would never get the tune perfect because id always be changing things to try and fix that dumb problem.

[c2xejk]

Today I finished up the install of the air bags. With 25psi in them the rear is noticeably firmer on launch (less squat).

[Sundance 6g72]

does it feel good when cornering? Just curious

those springs look like they are deff stiffer than mine. yours felt stiffer if i remember right.

[c2xejk]

does it feel good when cornering? Just curious

those springs look like they are deff stiffer than mine. yours felt stiffer if i remember right.

Hopefully the springs are stiffer. I installed them new just before Drag Week. Also, they are for a LeBaron.

I haven't tried much cornering yet. The stiffer spring rate should keep the rear flatter in corners...

[Ondonti]

They did help my Spirit. I think the air bags work great air shocks (what I have in the Duster) IMO do not work.

[MC#4]

They did help my Spirit. I think the air bags work great air shocks (what I have in the Duster) IMO do not work.

Air shocks made a night/day difference on my car.

[Ondonti]

Now, the last video is a much slower run but a better 60' There is less drop in the back but the clutch is slipping on the launch.


My experience was that air shocks lifted the rear of my car off the springs (so that there is little to no tension on them). I have S/T springs so they want to help things out and the shocks won't let them. Air bags did not lift up my Spirit as much and there was no drop because they won't compress.
Air shocks at 100psi or whatever (more = higher rear end) still compress when you launch hard. I tried all sorts of limiting strap ideas to keep the rear from raising up but somehow I always broke one coming off a curb at the track or something or other. I wanted the limiting straps to see if I could salvage the air shocks and pretend they were helping me Still not sure about them.

I got 2.2 60's on an AA body with Kumho HP4's (boring all season) & Air bags so I must say they work great. I actually would set one side harder back then because I felt one tire was spinning more then the other.

[Sundance 6g72]

with all that effort, coil overs or ed's idea seems to surfice and help handing.

[c2xejk]

The engine is making a noise that sounds a lot like a spun bearing to me... The car is now in the barn waiting to have the engine swapped. I could spend some time confirming the diagnosis, but I have the replacement engine ready to go, so why bother... I now have my motivation to get off my butt and swap the engine.

[Sundance 6g72]

250000 + miles. its about time. especially for a RACE ENGINE!!


get to it!

[Ondonti]

with all that effort, coil overs or ed's idea seems to surfice and help handing.

Idea? I ran those 8 years ago in my AA body and I copied someone else :P
What I am saying is that they seem to work great for OEM rear suspension and that the hydraulic shocks are garbage. Air bags let you run a nice rear shock AND be able to firm things up.
Rear end does get squirly with either style pumped up.

[Sundance 6g72]

ed, can you send me your tune so i can copy over the settings you changes?

[c2xejk]

ed, can you send me your tune so i can copy over the settings you changes?

Long story, but right now I do not have access to that laptop...