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Effect of lowering car


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#1 RebekahsZ

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Posted 10 July 2014 - 05:58 PM

What effect does lowering a Z car have on drag and CD? No, I didn't search. Not at all. With coilovers, lowering is simple, and free. I have a 1/2-mile event in a couple months and am wondering if I should slam it for the event.

1972 240z, purchased in 1991 for $900. Bone stock LS2/T56/DBW from 2006 GTO, swap completed in 2011. 400rwhp/435 rwtq. 2400# minus driver. JCI swap, Mantic ER2 clutch kit, JTR headers, single exhaust, Borla muffler, MGW shifter, M2 Differentials shortened Z31 CV axles, Z31 CLSD R200, Chequered Flag Racing billet stubs and companion flanges. MSD 2-step, Hurst roll control, both operated from switches on clutch pedal. 9" Hoosier drag slicks on Weld Draglites, 245/45/16 Hoosier A6/R6 on 16X8+10 Rota RBR. 225/250 sectioned coilovers, Koni 8610-1437RACE shocks, DP and EMI camber plates, MM shortened rear control arms, TTT front control arms, poly and aluminum bushings. Top speeds: Ohio Mile 174mph, C/GMS class record holder, best 1/8 mile 6.96 at 100mph, best 1/4-mile 11.0 at 126mph, best 60' 1.43, best 1/2-mile 148mph at GA 1/2-mile. Home Track-Jake's Dragway, Moulton, AL. SCCA autocross club - TVR, Huntsville, AL. Lets race!


#2 G-E

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Posted 11 July 2014 - 12:32 AM

It will of course, it completely changes undercar aero, and depending how bad that was, it could effectively produce a smaller frontal area for the purposes of drag



#3 johnc

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Posted 11 July 2014 - 07:18 AM

Adding rake will increase down force (or reduce lift).  How much and how much is enough and how much is too much?  I don't know. 


----- John Coffey, Fabricator at Benton Performance, LLC

#4 gnosez

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Posted 11 July 2014 - 02:08 PM

I suspect Andy Flagg, Tony D and Burton Brown would know....


"you're only young once, but you can stay immature indefinitely"

#5 JMortensen

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Posted 11 July 2014 - 03:38 PM

Should be all good until you start hitting the bump stops.


Jon Mortensen, owner/operator www.petdoorstore.com


#6 RebekahsZ

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Posted 11 July 2014 - 06:18 PM

Or the oil pan!

1972 240z, purchased in 1991 for $900. Bone stock LS2/T56/DBW from 2006 GTO, swap completed in 2011. 400rwhp/435 rwtq. 2400# minus driver. JCI swap, Mantic ER2 clutch kit, JTR headers, single exhaust, Borla muffler, MGW shifter, M2 Differentials shortened Z31 CV axles, Z31 CLSD R200, Chequered Flag Racing billet stubs and companion flanges. MSD 2-step, Hurst roll control, both operated from switches on clutch pedal. 9" Hoosier drag slicks on Weld Draglites, 245/45/16 Hoosier A6/R6 on 16X8+10 Rota RBR. 225/250 sectioned coilovers, Koni 8610-1437RACE shocks, DP and EMI camber plates, MM shortened rear control arms, TTT front control arms, poly and aluminum bushings. Top speeds: Ohio Mile 174mph, C/GMS class record holder, best 1/8 mile 6.96 at 100mph, best 1/4-mile 11.0 at 126mph, best 60' 1.43, best 1/2-mile 148mph at GA 1/2-mile. Home Track-Jake's Dragway, Moulton, AL. SCCA autocross club - TVR, Huntsville, AL. Lets race!


#7 260DET

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Posted 17 July 2014 - 10:20 PM

Going in a straight line then drop it down with some rake as John suggested.



#8 Tony D

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Posted 14 August 2014 - 03:49 PM

Oil pan should be above crossmember.

If not...shame on you!
Misanthropic Anthroparion Class 5 Hoarder, aspiring to posthumous fame as my containers are cut open and the market floods with crap I've squirrelled away over the years! I endeavour to persevere...

#9 RebekahsZ

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Posted 14 August 2014 - 04:05 PM

It is what it is.

1972 240z, purchased in 1991 for $900. Bone stock LS2/T56/DBW from 2006 GTO, swap completed in 2011. 400rwhp/435 rwtq. 2400# minus driver. JCI swap, Mantic ER2 clutch kit, JTR headers, single exhaust, Borla muffler, MGW shifter, M2 Differentials shortened Z31 CV axles, Z31 CLSD R200, Chequered Flag Racing billet stubs and companion flanges. MSD 2-step, Hurst roll control, both operated from switches on clutch pedal. 9" Hoosier drag slicks on Weld Draglites, 245/45/16 Hoosier A6/R6 on 16X8+10 Rota RBR. 225/250 sectioned coilovers, Koni 8610-1437RACE shocks, DP and EMI camber plates, MM shortened rear control arms, TTT front control arms, poly and aluminum bushings. Top speeds: Ohio Mile 174mph, C/GMS class record holder, best 1/8 mile 6.96 at 100mph, best 1/4-mile 11.0 at 126mph, best 60' 1.43, best 1/2-mile 148mph at GA 1/2-mile. Home Track-Jake's Dragway, Moulton, AL. SCCA autocross club - TVR, Huntsville, AL. Lets race!


#10 Mikelly

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Posted 19 October 2014 - 02:18 AM

Drysump, Baby...

 

 

It is what it is.


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mjk 1994


#11 RebekahsZ

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Posted 19 October 2014 - 06:38 AM

OK, ok, I'm a worm for having my terrible F-body oilpan hanging down like a pair of balls from a reciever hitch.....  I'm already spending over $100,000 Alabama dollars this year on this pool/garage project for the soul purpose of getting the Z out of my wife's garage, which of course is attached to my wife's house.  So I guess another $5000 on the Z is equally as justified.  But the drysump will have to wait until after I install a couple of lifts-this working on the ground is for the young kids.  After hours energy is the rate limiting factor.  How do some guys have energy for a drinkin' and womanizin'?


1972 240z, purchased in 1991 for $900. Bone stock LS2/T56/DBW from 2006 GTO, swap completed in 2011. 400rwhp/435 rwtq. 2400# minus driver. JCI swap, Mantic ER2 clutch kit, JTR headers, single exhaust, Borla muffler, MGW shifter, M2 Differentials shortened Z31 CV axles, Z31 CLSD R200, Chequered Flag Racing billet stubs and companion flanges. MSD 2-step, Hurst roll control, both operated from switches on clutch pedal. 9" Hoosier drag slicks on Weld Draglites, 245/45/16 Hoosier A6/R6 on 16X8+10 Rota RBR. 225/250 sectioned coilovers, Koni 8610-1437RACE shocks, DP and EMI camber plates, MM shortened rear control arms, TTT front control arms, poly and aluminum bushings. Top speeds: Ohio Mile 174mph, C/GMS class record holder, best 1/8 mile 6.96 at 100mph, best 1/4-mile 11.0 at 126mph, best 60' 1.43, best 1/2-mile 148mph at GA 1/2-mile. Home Track-Jake's Dragway, Moulton, AL. SCCA autocross club - TVR, Huntsville, AL. Lets race!


#12 JMortensen

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Posted 19 October 2014 - 11:05 AM

Could always just get a Kevko pan. $500ish.


Jon Mortensen, owner/operator www.petdoorstore.com


#13 duragg

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Posted 21 October 2014 - 08:36 AM

My stupid Arizona Zcar pan hangs below the cross member.  Dangerously close to the track in my opinion.  Meh...   Its taken a few hits already.

 

Lowering also moves weight around, no? 

I vote for slam.  Count your rotations and you can go right back to where you were.


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1973 S30 (Gutted & caged NASA ST3) 2252lbs (dry & vacant) / VQ35HR/ 4.375 CLSD R200 / GC-Koni doubles / 275 R7s / Safety is a priority.


#14 johnc

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Posted 21 October 2014 - 03:54 PM

Most S30 folks run their cars too low for best handling.  As you lower the car you must increase spring rate and increase shock damping.


----- John Coffey, Fabricator at Benton Performance, LLC

#15 Tony D

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Posted 25 October 2014 - 09:12 AM

Mmmmm stiffness...
Misanthropic Anthroparion Class 5 Hoarder, aspiring to posthumous fame as my containers are cut open and the market floods with crap I've squirrelled away over the years! I endeavour to persevere...

#16 gira

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Posted 27 October 2014 - 04:55 AM

I run the AZC oil pan on an IT car. For safety, I welded a steel angle on the cross member just in front of the oil pan hanging down. It was just about four inches long and I believe it was 1" angle just turned up like a "V". It will sacrifice itself before the oil pan.

 

Greg Ira



#17 Nelsonian

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Posted 27 October 2014 - 08:10 AM

^^^ I like this idea and will follow when the time comes to reassemble the car. I have the AZC oil pan as well.
Nelsonian, San Diego, CA.

#18 aongch

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Posted 10 November 2014 - 01:07 PM

Most S30 folks run their cars too low for best handling.  As you lower the car you must increase spring rate and increase shock damping.

This is true, I'm wondering if my Eibach 250 lbs, at all corners on the EMI coilovers will be enough to keep a lower ride height (slight rake) or need to raise it a bit. Will be testing my project soon at ACS and next yr Buttonwillow, WSIR. It's damped by Tokico Illuminas.


1973 240Z | RB26DETT | Z32 5-spd | Z31 R200 | Quaife LSD | fully welded roll cage | Wilwood | Watanabe | EMI/Eibach | ATL | Summit Racing | MSA | JER Development


#19 aongch

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Posted 23 December 2014 - 12:04 PM

I'm starting at 1/2 inch lower front (rake) with the MSA dam and BRE rear spoiler. We'll see how this works out, if I need more wing and/or splitter. ACS will be a nice track to test aero/downforce (145+ front straight in M3).  Report back soon..... 


1973 240Z | RB26DETT | Z32 5-spd | Z31 R200 | Quaife LSD | fully welded roll cage | Wilwood | Watanabe | EMI/Eibach | ATL | Summit Racing | MSA | JER Development





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