mine cost me 3 bux and some creative thinking

 

how does it work for you?

 

The only thing they did for my car was make the bumper cover look ugly. We did quite a bit of testing a few years ago and found no improvement.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 &raquo;</TD></TR><TR><TD CLASS="quote">

Yup. I have spent over $500 with him thus far and he will be getting another $900 or so from me in a few weeks.

Adam is a true professional business man.

I will stand by his word any day of the week.</TD></TR></TABLE>


Yes Adam is a good man

 

i put a golden eagle one on because my bumper was messed up from an accident to begin with. i wasn't a fan of them and still aren't, but i think it's really hard to prove since there are a lot of variables going on while drag racing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrParks &raquo;</TD></TR><TR><TD CLASS="quote">mine cost me 3 bux and some creative thinking </TD></TR></TABLE>

What kind of hinges did you use and where did you get them from??

I'm actually thinking about picking up another bumper and doing the hinge thing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FUCATYPR &raquo;</TD></TR><TR><TD CLASS="quote">

Holes in the rear bumper got me a few MPH and a tenth or two on 103mph car.

</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ALL IMPORT &raquo;</TD></TR><TR><TD CLASS="quote">well well.

i decided to put this theory to the test. went to the track friday with my teg went 140mph at best .

then sat night cut 3 3inch holes both sides of the bumper & car went

141.47mph
143.59mph

with that said it does help. aslo 60ft was thr same both nights.
hope this helps
put the holes in so iu could be cool like the rest of u "PRO" guys </TD></TR></TABLE>

I told you guys

 

Maybe some gain on a higher MPH car, but on a 1o sec and slower car they do nothing.

 

they helped me and mine was a 11.5, 120+ car. i think anything that goes over 100+ it probably helps alot.

 

after my little tests, i can say whenu hit around 50mph thier is some sort of gain.

but u probably wont see the diffrence till the 1/8 mile on.

i gianed 3mph top end, faster et. & i was running 2psi lower than normal, so thier is alot of good eveidence thier.

oh my car was in the low 10s as well

 

It's good the see some of you have gotten good gains from the holes, but I think that most of the gains that you see are not from the holes. 99% of E.T. is determined in the first 60 feet and thoses holes are doing nothing there. I'm sure all of you have had unexplained ET and MPH increases before But when you cut the holes and saw an increse you thought it was the holes that did it.

In a world where gas milage is king, you would think that all the car companys would make sure there is no drag from the bumper cover...think about it. If it does as much as some of you think to create drag, the car companys would have done something about it to achieve as much MPG as possiable. Something to think about.

 

Well, i agree for the most part, but honda did put a big *** muffler back there in the opening, and i'm pretty sure that does a lot to keep airflow from getting up into the bumper area. Not many of us are still running stock mufflers, or anything near stock size to block the airflow up there. And the simple fact that honda did put a cover on the opposite side of the muffler on the civic VX ( i think that's the model?), says something, especially when it's on their most fuel efficient civic at the time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jgf &raquo;</TD></TR><TR><TD CLASS="quote">
In a world where gas milage is king, you would think that all the car companys would make sure there is no drag from the bumper cover...think about it. If it does as much as some of you think to create drag, the car companys would have done something about it to achieve as much MPG as possiable. Something to think about.</TD></TR></TABLE>

Newer cars do have components that help reduce drag. On my 94 Civic VX, there is a diffuser in the rear bumper.

 

Most of all the newer cars plus older Hondas (EG) did have a have one. Just look under and you would notice it. It doesn’t necessarily have to be a huge cut out or holes but something simple like the plastic extending from the rear bumper to the bottom of the gas tank. To achieve the effect of the rear diffuser you need to only go above 50nph. Most of the guys running 100mph and above may notice a lot depending on what they took out the rear like the gas tank, the muffler, rear support, ect... Removing all this would cause a parachute in the rear with the bumper the way its shaped leaving air tramped with no where to go. Think of it like this, you stick your hand out the car making a cup shape starting from a stop going up to 70mph. The faster you go the harder it is to keep the hand in one spot. Now if you take that same hand a flatten it out and do the same exact thing it becomes a lot easier.

 

imo they do help out. car seems to be a ittle more stable also. it may not be the most appealing to most looks wise but worth it if you feel you need it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jgf &raquo;</TD></TR><TR><TD CLASS="quote">It's good the see some of you have gotten good gains from the holes, but I think that most of the gains that you see are not from the holes. 99% of E.T. is determined in the first 60 feet and thoses holes are doing nothing there. I'm sure all of you have had unexplained ET and MPH increases before But when you cut the holes and saw an increse you thought it was the holes that did it.

In a world where gas milage is king, you would think that all the car companys would make sure there is no drag from the bumper cover...think about it. If it does as much as some of you think to create drag, the car companys would have done something about it to achieve as much MPG as possiable. Something to think about.</TD></TR></TABLE>

uhh i think it was on page three when someone posted back to back runs with the SAME 60 foot and gained MPH due to the holes..

and 92-95 civic vx's have a diffuser. something to think about.

 

[IMG][/IMG]

 

One thing that hasn't been mentioned is the effect the "holes in the bumper" might have on the parachute, for those that need one of course. I would think the chute might be less prone to fouling while filling up but I'm sure there are a lot of other variables that go with that.

One other point is the drag inducing turbulent airflow that tumbles off the roof and up from under the car might be straightened out by air spilling out of these holes. Or it may just interrupt the turbulent airflow. This may reduce overall drag on the car and rear end lift is most certainly affected. I think the actual dynamics behind why or if these work is fairly complex and there are so many different setups out there that you can't just say they work or they don't. Ask a room of 50 guys and half are gonna give you a yes or no answer.

Whether you cut holes in your bumper or use a diffuser if it makes your car faster you keep it, if it doesn't then take it off. The benefit will vary but the guys that win think in small details to make a greater system.

 

i know for a fact it helped me. my 60's were allways the same, mid 1.7's my car was pretty consistant...withing a tenth or two and a mph or 2....i did the cut along the bottom and had increases like i had never seen before..instantly. my 1/8 did improve by 2mph while my et at the 1/8 was close to the same...i truly believe it was all gained at teh big end of the track.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crx12 &raquo;</TD></TR><TR><TD CLASS="quote">
Whether you cut holes in your bumper or use a diffuser if it makes your car faster you keep it, if it doesn't then take it off. The benefit will vary but the guys that win think in small details to make a greater system. </TD></TR></TABLE>

All in all, this is the best answer given

 

put it this way, after my results i will be putting more holes in my sh*t

 

it helps!! if ya dont think so take a pass with your windows down a let me know if ya see a difference

 

he guys saw this thread the other day so i took my dd del sol to the track yesterday.
bone stock jdm b16 swap I/H/E Full weight on 15" gsr rims
First run went 14.9 @ 92.3 with bumper on
Second went 14.71 @ 94.5 with just taking the bumper off only

I ran a couple 14.8's also with 94. traps

All 2.2 60's, those damn b16s are hard to get out of the hole.

All in all i gained 2mph and 1mph in the 1/8th just from no rear bumper!!
for a free mod

 

I've know this for eight years now....but still people are not willing to believe it.

 

they dont believe it cause their 2 dumb to understand laws of DRAG