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On my 2012 G12 when slick I ran:
Springs: Integra LF 500 RF 550 and 175's across the back.
Shocks: Integra LF 5-3 RF 3-6 LR 8-2 RR 3 or 4 depending on the track. 80 - 110lbs of bite ( with driver...

Sounds like it is just misfiring between 2500-300 and clears up and runs ok in higher rpms?
Have seen weird stuff from the LS MSD boxes before. I assume that you moved the coil pack from #1 to...

Sounds like a fun class until someone starts dumping a ton of money into theirs like all classes are these days.
Consider you are running a 2 barrel carb, compression ratio, restrictive manifolds,...

You will not find anything better in that price range.
Have used their 4340 and Pro Max cranks along with their I-beam, H-beam and street / strip rods in everything from engines requiring stock...

If you are talking about the screw in restrictors for the lifter galley in a SBC, no, I have never had any problems with them. They are used to restrict oil to the lifters, pushrods and rockers and...

Hate to hear that. I know how it is to lose a good car.
Did you ever make any changes to it and if so, how did it do?

What manufacturer has the truest or most accurate ratings on their coil springs ?
Anyone done any testing recently ?
Appreciate any input.

It could make the car loose on entry by keeping the LR planted harder.

I kept my jetting the same and did not see any difference but it would be a good idea to hot lap and do a plug reading anyway.

Ask your carb guy about Sunoco EXO2 jetted 12-15% richer than you are now.

It is supposed to help turn the car especially while on the throttle but it sacrifices drive off according to the guys I have talked to that have tried it on modifieds. Don't have any personal...

What type of fuel regulator are you using and on the nights it acts up, did you buy fuel at the track or did it come from the same barrel of fuel that ran good before?

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Its the other way around. Run the solid bar when the track has a lot of bite and switch to the sprung / bushing bar when it looses traction.

I have ran the soft spring/lot of pre-load deal in a few different class cars. What I found was after the spring is past a certain point , the effects start going the other way from how you intend. I...

To be honest it sounds like you need to look for binding in the suspension if you are not getting much movement in the front. We run the same springs in front 1000 LF and 900 RF as you are and...

Depending on driver weight and seat placement, you could be heavy on Left side % and Rear % and have a lot of Bite with the driver in the seat. Too much bite or too much Left side % will make it...

If you are running 3 wheel brakes, that might be your loose entry problem.
Springs are close. If you swap the fronts that would tighten exit but will loosen entry even more.
Tighten entry: Move RF...

Glad to hear you are getting better and thanks for the feedback also. Give 'em Hell.

Did you find the problem with it?

One of the worst mistakes I ever made was to make too many changes at one time. If you increased you LR bar angle, I would try that and see what it does before changing anything else. One change at a...

Forgot to add that your LL bar will probably already be in one of the upper chassis holes when using that much angle.

I want to say you need 5" - 5-1/2" of drop should get you pretty close. Let out on your limiter chain until you get to around 43 degrees and see how much drop you have. Make sure that you dont over...

A friend of mine runs LR spring in front on a slider with shock behind. RR spring on top of housing with shock in front.
Raise the LL bar up on chassis to add drive. Around 42 - 45 degrees LL bar...

If you went to to the ultimate soft RF spring setup which is no spring at all in the RF, what would it do ?
If the right springs are not under the car, then no amount of bar adjustments in the world...