Velocity-8

I launched around 3500-4000. The difference was NOT what I expected either but on my ride home the CZ was still off and felt a lot slower.

Lawerence

Im sure it was due to the temp and humidity.

When you go back in better weather I expect low 14s


I took my car to the track in similar weather (100 track temp 85% humidity) and was hoping for 13s but was dissapointed. My friend that same day was running 15.6+ in his rx8.

guy321

I don't think that an expected 1 second gain is realistic for a 20HP increase mod.. Maybe more like .5 seconds.

However, Velocitie's results still fall short of this..

Using a simple HP calc.. http://www.dsm.org/tools/calchp.htm and assuming 3000lb

His stock run put him at 180whp using the "speed" method.

His CZ run calculated to 192 HP using the same method.

Interesting numbers since posted dyno runs put the stock HP rating at about 180.

CZ is working on a new map to go with the M flash, which should be released any day now. I think this will bring us closer to the .5 increase over stock.

Velocity-8

Here are the time slips...

AbusiveWombat

Good luck next time Velocity....hopefully the weather is a little nicer.

For those interested in estimating the drop in 1/4 mile time here's a simple formula that is fairly accurate (at least for the EVO's).

For every 10 hp, drop the time by 1/10 th of a second. So I would expect a 0.2-0.3 drop in Velocity's time.

Obviously it doesn't work all the time but it's a decent estimate and generally doesn't over estimate to set you up for disappointment.

BlackRX8-Miami

why does Car Driver report a 14.5 1/4 time ?

Omicron

I've wondered the same thing. Actually, all the trade magazines reported a 14.5 s 1/4 mile when the '8 first came out. I suppose while it's possible (Judge Ito, for one, has gotten a 14.3) it's certainly not easy. I think the way they did it was (a) with a very experienced driver, (b) by dumping the clutch at 8000+ RPM (they could care less about the car, so why not?) and (c) with lowered rear tire pressure and/or with other things that help, like warm, sticky tires and perfect conditions.

And most importantly, I think the car magazines tested the '8 before Mazda kludged the ECU tuning to pass the EPA catalytic converter tests. If so, it probably was putting out close to 250 BHP, and a 14.5 s would be doable.

Lawerence

Some magazines (Road and track, maybe Motortrend) powershift also. And that can drop your 1/4 mile time by .1-.2

ForceFed

Give me a healthy running *stock* RX-8 and i will give you a timeslip under 14.3.

BTW, i'm not trying to give you guys a hard time but 60 footers in the high 2.2s and 2.3s are terrible. Whats with all this "clutch drops" being tossed about in this thread? I can hear the collective whine from all the poor 8 trannies from here...

Velocity-8

Let's see some slips then! :D Stock with stock tire pressure.

Ike

Yeah... Don't launch an RX-8 at high RPMs and you'll be lucky to be in the 15s, you clearly have no clue what you're talking about.

Ophitoxaemia

2.2sec 60' time is awful for a RWD car. isnt 1.8 sec a good mustang time on decent tires?

wheelhop kills acceleration, as does getting caught hooked up with the tach below 6K. thats one reason i think a lighter flywheel should help. my V8 car has twice the torque, and a buttload at 2K RPM, so its just going to be an easier drag car.

you can combat wheelhop with stiffer rear bushings usually. the mustangs use an auxiliary shock to reduce axle hop.

my suggestion: forget the drag strip, take your 8 to the road race track or autocross, thats where it really impresses.

james

Ike

It seems if you hookup too well with the RX-8 it slows you down and bogs. Also, most RWD cars are not getting 1.8 60' without DRs.

ForceFed

LOL!

Where in my post did i say anything about NOT launching the car at high RPMs? I was talking strictly in the context of how some of you are dropping the clutch.

But you must be right. I don't have a clue what i am talking about and have no idea how to launch a rotary powered car.

BTW, here's a 1/8th mi pass of my *stock* RX-7. This is video of my slowest pass. Out of three passes that night i ran 8.58, 8.70 (back to back from the 8.5 run, was heatsoaked) and 8.74 which is the pass in the video.

Right Click, Save As

BTW, that was my slowest pass and on that pass i got a 2.09 or 2.10 60ft time(can't remember which) Thats on my original tires from 1993 with 45kmi on them complete with sidewall dry-rot and flatspots from storage. My best 60' that night was a 2.001. On newer tires i'd nail a 1.89-1.90 all day long and whistle doing it.

Enjoy :D

ForceFed

Slips for what? I have a couple of slips for my 7 that are 1/8th mi. I don't have them scanned but here is the slip breakdown for you:

http://www.rx7club.com/showthread.ph...hreadid=313974

My 8.5 second pass was with stock tire pressure in it, tach up 4-4500 and slip it coming out. Not sure how i would launch an 8 because i have never driven one but one pass in one is all i need to figure out where i need to be launch-wise and i'll give you a slip better than 14.3 provided the car has working 6 ports, etc.

ForceFed

BTW Ike, don't quit your day job as King Troll. AWD cars aren't the only stock cars that can pull off 1.8 short times on factory stock tires. Every 13 second capable(and under) car i've ever owned has dipped into the 1.8s at one time or another.

Stock RX-7 1.88
stock 00 Viper R/T 10 1.82

Velocity-8

I'd like to see YOU do better with a stock RX8 without destroying the car.

Ike

And how exactly does that go against what I've said... Most RWD cars don't run 13 sec or under just like most RWD cars aren't going to get 1.8 60', and the RX-8 ceratinly isn't one of those which just happens to be the car we are discussing.

ForceFed

Because you said........
Which is a blanket statement meaning that most RWD cars don't stand a snowballs hell in chance at landing a 1.8 60 footer. I happen to have nailed 1.8s on stock factory tires on both my RX-7 and Viper. It IS possible. Just because you can't do it doesn't mean it's not possible. Ike, you are contradicting yourself because in one post you say 1.8 short times are not possible for most RWD cars and then again in another post you quote me and ask how does that go against what you've said? I'm not agreeing with you...

I never said i could get a 1.8 short time out of a stock RX-8. I DID however say that i would get better than a 2.3 and a 14.3 1/4 time :D Ike, please pay attention to what i'm saying, otherwise i won't respond to your posts.

:D

ForceFed

Ok? Who else is going to do better? My imaginary John Force driver? Of course *I* would do better with a stock RX-8 and not kill the car. My Jedi forces are sensing some major "hating" going on in this thread...

Velocity-8

I'm not hating anyone in this thread. However, I don't value the opinion of someone who does not even own/drive the car we are discussing.

ForceFed

Fine. Will you value my opinion when i show you video and timeslip of a stock 6 speed RX-8 running better than 14.3? Someone put up :D

Ike

Actually a blanket statement would be all RWD cars won't get a 1.8 60', notice that little word there, it says most. Understand smart guy? Also, please pay attention to the words I type (I.E. all or most), I could care less if you respond to my posts, and monkeys are flying out of my butt as I type. Are we clear now Corky?

Velocity-8

I did see that post. He destroyed his tranny on that run.

zerobanger

In Forcefeds defense, I have known him for almost 3 years. In that time he ran 11.77 in his stock 00 viper. Do a lookup and you will see that is one of the best published times for a 00 viper. Darril, ran a 13.5 bone stock (even the original rubber) in his CYM 1993 Rx-7 at English town.

I have yet to see anyone with the driving skills of darril. Hell, he even holds some records for dragracing his snow mobile.

So before IKE (a guy who probably does't know the difference between a drag strip and a drag queen) and some of you others bash him, maybe you should do a little research.