EXTRA 1/2" Drop w/Full Tank On Eibach Pro-Kit?!
10-21-2008, 06:37 PM
#1
EXTRA 1/2" Drop w/Full Tank On Eibach Pro-Kit?! I installed my Eibach Pro-Kit in January. The rear sat a little lower than the front...I thought the front end just needed to settle (which I thought it finally did). I JUST filled my tank (yes, for the 1st time since Jan.) and noticed that the rear-end seemed to be sitting lower again. I pulled out the tape measure and sure enough, it's sitting almost a 1/2" lower than it was BEFORE I filled my tank!
I know the Pro-Kit rear springs are known to be soft, but is an extra 1/2" drop on the rear NORMAL with the Pro-Kit on a full tank vs. an empty tank?!
I know the Pro-Kit rear springs are known to be soft, but is an extra 1/2" drop on the rear NORMAL with the Pro-Kit on a full tank vs. an empty tank?!
10-21-2008, 07:49 PM
#4
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that really sucks. Someone really needs to talk to Eibach about the quality of their springs. I guess until you decide to change your springs (if you do) just dont fill it up anymore. I dont know of any other problem there could be other than the springs just being too soft. What shocks are you running?
10-21-2008, 08:37 PM
#6
The car seems to sit level at around 3/8 - 1/2 tank of gas. Now I do have a stealthbox with 10" sub, and a few amps in my trunk too, so that probably adds another 40 Lbs or so if I had to guess. So...if you take that info, it seems that maybe the Eibach's are designed to sit level on a full tank of gas IF you don't have anything in the trunk?!
When we did the spring swap, I planned to stay on the stock shocks for now, but we tore the stock front shocks up pretty bad getting the stock springs off, so I had to make a quick trip to AutoZone and the only thing they had in stock were the Gabriel shocks. The rears were only like an extra $15 each, so I went ahead and decided to go with Gabriel's all the way around. Do you think the stock shock would fix this problem? I've still got them...
Eventually, I'll get a decent set of shocks, but I can't believe the Eibach Pro-Kit has this problem at all.
When we did the spring swap, I planned to stay on the stock shocks for now, but we tore the stock front shocks up pretty bad getting the stock springs off, so I had to make a quick trip to AutoZone and the only thing they had in stock were the Gabriel shocks. The rears were only like an extra $15 each, so I went ahead and decided to go with Gabriel's all the way around. Do you think the stock shock would fix this problem? I've still got them...
Eventually, I'll get a decent set of shocks, but I can't believe the Eibach Pro-Kit has this problem at all.
10-21-2008, 08:49 PM
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First off, Kappa Kappa Psi or Phi Mu Alpha? (making an assumption based on your user name)
Second, I don't think shocks will help this issue. Shocks will help stop the spring oscillation, but don't have an impact on ride height. Are the springs progressive? It's possible the added weight of a full tank of gas is "canceling" the first coil.
Not to be discouraging, but I've seen several posts where people talk about "Pro-Kit sag", particularly on the rear springs. Are you running the isolators or did you do the heater hose mod? If heater hose, you might consider putting the isolators back in. Or maybe you could swap out the rear springs and isolators with stock springs and heater hose, though I'm not sure if that would make the car level or give you a slight rake. Either way, I'd think a rake would be preferable over a butt-drag.
-Mike
Second, I don't think shocks will help this issue. Shocks will help stop the spring oscillation, but don't have an impact on ride height. Are the springs progressive? It's possible the added weight of a full tank of gas is "canceling" the first coil.
Not to be discouraging, but I've seen several posts where people talk about "Pro-Kit sag", particularly on the rear springs. Are you running the isolators or did you do the heater hose mod? If heater hose, you might consider putting the isolators back in. Or maybe you could swap out the rear springs and isolators with stock springs and heater hose, though I'm not sure if that would make the car level or give you a slight rake. Either way, I'd think a rake would be preferable over a butt-drag.
-Mike
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10-21-2008, 11:59 PM
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When I removed the spare tire and jack it raised my ride height on the passenger side and made it level with the driver side. The difference was about 1/4 inch.
10-22-2008, 08:18 PM
#9
First off, Kappa Kappa Psi or Phi Mu Alpha? (making an assumption based on your user name)
Second, I don't think shocks will help this issue. Shocks will help stop the spring oscillation, but don't have an impact on ride height. Are the springs progressive? It's possible the added weight of a full tank of gas is "canceling" the first coil.
Not to be discouraging, but I've seen several posts where people talk about "Pro-Kit sag", particularly on the rear springs. Are you running the isolators or did you do the heater hose mod? If heater hose, you might consider putting the isolators back in. Or maybe you could swap out the rear springs and isolators with stock springs and heater hose, though I'm not sure if that would make the car level or give you a slight rake. Either way, I'd think a rake would be preferable over a butt-drag.
-Mike
Second, I don't think shocks will help this issue. Shocks will help stop the spring oscillation, but don't have an impact on ride height. Are the springs progressive? It's possible the added weight of a full tank of gas is "canceling" the first coil.
Not to be discouraging, but I've seen several posts where people talk about "Pro-Kit sag", particularly on the rear springs. Are you running the isolators or did you do the heater hose mod? If heater hose, you might consider putting the isolators back in. Or maybe you could swap out the rear springs and isolators with stock springs and heater hose, though I'm not sure if that would make the car level or give you a slight rake. Either way, I'd think a rake would be preferable over a butt-drag.
-Mike
No I didn't do the hose mod on the Eibachs...the stock isolators ARE installed on the rear.
I had made a post a few weeks ago about rubber spacers that go between the coils and asked if that might cure the sag if I ever got it...but all of the replies I got just knocked me for going with the Pro-Kit. Anway, I went ahead and bought the spacers and I'll install them between one of the coils on each side and see if that cures my problem...I just can't beleive how bad the rear springs are in the Pro-Kit!
10-23-2008, 11:45 AM
#10
The rear springs are not stiff. I seem to recall gasoline is about 7 pounds per gallon which is around a 100 pound change empty vs. full. Adding weight to any springs will compress them, the Eibach's are softer than most and sit a little lower than some others, so it's often a bigger, more noticeable change. But ALL springs will change a bit with varying amouts of fuel, just like if you tossed 100 pounds of tools in the trunk.
While I agree that Pro-kits aren't ideal, this would happen (though less) with a quality spring and it happened stock. Stock springs are around 115 pounds, less than 137 of you Pro-kit. But they were higher so the change (which would actually be a touch more) with more gas just wasn't as noticeable. Stiffer springs would compress less and you spacers will stiffen the springs by effectively making some coils dead (not able to move) so that will help, but it's a band-aid.
The shocks aren't the issue, at least on the height. They don't set ride height. They are an issue on driveability, but not on the height alone.
While I agree that Pro-kits aren't ideal, this would happen (though less) with a quality spring and it happened stock. Stock springs are around 115 pounds, less than 137 of you Pro-kit. But they were higher so the change (which would actually be a touch more) with more gas just wasn't as noticeable. Stiffer springs would compress less and you spacers will stiffen the springs by effectively making some coils dead (not able to move) so that will help, but it's a band-aid.
The shocks aren't the issue, at least on the height. They don't set ride height. They are an issue on driveability, but not on the height alone.
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10-23-2008, 08:24 PM
#11
The rear springs are not stiff. I seem to recall gasoline is about 7 pounds per gallon which is around a 100 pound change empty vs. full. Adding weight to any springs will compress them, the Eibach's are softer than most and sit a little lower than some others, so it's often a bigger, more noticeable change. But ALL springs will change a bit with varying amouts of fuel, just like if you tossed 100 pounds of tools in the trunk.
While I agree that Pro-kits aren't ideal, this would happen (though less) with a quality spring and it happened stock. Stock springs are around 115 pounds, less than 137 of you Pro-kit. But they were higher so the change (which would actually be a touch more) with more gas just wasn't as noticeable. Stiffer springs would compress less and you spacers will stiffen the springs by effectively making some coils dead (not able to move) so that will help, but it's a band-aid.
The shocks aren't the issue, at least on the height. They don't set ride height. They are an issue on driveability, but not on the height alone.
While I agree that Pro-kits aren't ideal, this would happen (though less) with a quality spring and it happened stock. Stock springs are around 115 pounds, less than 137 of you Pro-kit. But they were higher so the change (which would actually be a touch more) with more gas just wasn't as noticeable. Stiffer springs would compress less and you spacers will stiffen the springs by effectively making some coils dead (not able to move) so that will help, but it's a band-aid.
The shocks aren't the issue, at least on the height. They don't set ride height. They are an issue on driveability, but not on the height alone.
10-24-2008, 11:26 AM
#12
Sorry, I order springs as matched sets. Sometimes I get overages and have extra rears to sell, but I never know that until the very end and it's never a lot. Last time it was 5 sets. When that happens I will post, but they go fast.
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18 SCCA National Championships in house, many more for our customers prove we know our stuff.Talk is cheap, results matter.
Check out our KONI prices, our Master Cylinder Brace, and new Xtracker Hub/wheel bearing upgrade kits!
www.stranoparts.com --814-849-3450
18 SCCA National Championships in house, many more for our customers prove we know our stuff.Talk is cheap, results matter.
Check out our KONI prices, our Master Cylinder Brace, and new Xtracker Hub/wheel bearing upgrade kits!
10-26-2008, 08:26 AM
#13
..... Now I do have a stealthbox with 10" sub, and a few amps in my trunk too, so that probably adds another 40 Lbs or so if I had to guess. So...if you take that info, it seems that maybe the Eibach's are designed to sit level on a full tank of gas IF you don't have anything in the trunk?!
BINGO!
01-04-2009, 05:06 PM
#16
UPDATE:
I FINALLY had time this afternoon to go and install the spacers. I THINK they did the trick. I was on 3/4 tank of gas and after I installed the spacers, the rear is now 1/4" higher than the front on 3/4 tank of gas. It WAS a 1/2" LOWER than the fronts on a full tank of gas, so I'm fairly confident this solved the problem since I'm now a 1/4" higher on 3/4 tank...I guess I'll know for sure when I fill up. My front top of the fenders is 26.5" off the ground and the rear is now 26.75" off the ground.
I took the 1" spacer and twisted it around until it wouldn't go any higher at the top of the rear spring. It was probably between the 2nd and 3rd coil.
Here are the type of spacers I'm talking about:
http://store.summitracing.com/partde...5&autoview=sku
I got mine at Pep Boys for like $10 each.
I FINALLY had time this afternoon to go and install the spacers. I THINK they did the trick. I was on 3/4 tank of gas and after I installed the spacers, the rear is now 1/4" higher than the front on 3/4 tank of gas. It WAS a 1/2" LOWER than the fronts on a full tank of gas, so I'm fairly confident this solved the problem since I'm now a 1/4" higher on 3/4 tank...I guess I'll know for sure when I fill up. My front top of the fenders is 26.5" off the ground and the rear is now 26.75" off the ground.
I took the 1" spacer and twisted it around until it wouldn't go any higher at the top of the rear spring. It was probably between the 2nd and 3rd coil.
Here are the type of spacers I'm talking about:
http://store.summitracing.com/partde...5&autoview=sku
I got mine at Pep Boys for like $10 each.
