RX8PR

Yesterday I visit my local 1/8 mile race track in Puerto Rico. I make
3 runs, the fastest was the last one and I make 9.17 S @ 80.50 MPH

I launch it just same as a normal drive, just push the pedal after the 2,500 rpm.
I don't launched the car at high rpm because I was afraid of the wheel hope.

The first run was 9.45 S and the second 9.62 S(launched at 3,000 rpm that cause a big traction problem).

We think that the car can run on the 8's with a good reaction and good tires.
My car has 273HP at the wheel but need better suspention and tires to handle
those HP.
I have plans to run on a 1/4 mile race track on the next weeks...............

Manuel

dmp

hmm...Traction. You need traction. I was hitting mid-high 8s w/ my old probe gt, and about 250whp/260lbs-ft. Practice...Get that 60-ft time down to about 2 seconds flat, and you'll have a mid 13 second run, in the 1/4, easy.


:D

RX8PR

On the next visit I would try to use the factory 18" wheels that has brigtestone potenza, they are softer than my actual Ventus K104 mounted on 19" wheels.

Thanks,

Manuel

knonfs

Congratulations, that's a high 13's

dmp

I dissagree...I'd guess (for what that's worth) low 14s at best. 2.2 60ft...that's the issue.

rotorpr

Manuel;

Let me know when you are going to race again in Manati. I am planning to race mine to have a baseleine I just installed the RB exhaust.

knonfs

With those 2.2 60ft, the car *should* be in the high 13's, if he gets a better 60 ft, he will do a better on the 1/8, and so on .

knonfs

Did Galdi retuned the e-manage after the new fuel pump?

dmp

I guess it could have been 'close'.

My old car, with 250whp/260lbs-ft at the wheels...car was 2885lbs w/o me...

knonfs

Your 1/8 & MPH, are almost the same as his best pass of the night, unless theres a drastic change on his acelaration after the 1/8 mile, his 1/4 time should've been really close to yours.

dmp

As I wrote - it could be close. Still, .1 off at the 1/8th could translate to more than that off at the 1/4.

RX8PR

Rotorpr,

I would advice you the next time I going to run the car at Manati Race Track.
It would be a Thursday..................... on Saturday it's to crowd!


Knonfs,

Yes after changed the fuel pump we changed our map..........
We try to use one of the Jeff map's but we see FAR near 10.0 or less, the car can't run on the dyno at that time there was too much gasoline.
Our pump it's installed with a vacuum, for every psi of boost we increase 1 psi of fuel pressure.

We make a lot of dyno run's that day just tuning our emanage, add the end of the day we kept the best map that we see. But probably we would need to change it, when
the external waste gate arrives by mail................
Galdy it's the mechanic but the tuner it's Javier Monroy he works a lot with emanage. He already tuned emanage for other customers with 350Z, S2000 and others
that are using the emanage. Galdy it's really and expert on rotary engines but talking about computers he works a lot with microtech computers but for my car he call Monroy that know more about the emanage.

dmp,

I agree with you, the times of the two cars looks similar....................

To get that 60-ft time down there is something to consider,
That night I was launching the car same as I begin to run the car from stoplight.
The next time I would try to run with the factory wheels & tires
The factory tires are 180 tread vs. my actual Ventus that are 280.

I can't find on the web 19" tires with a tread lower than 180 (soft compound) if any one
know we're to find please let me know!

Do you think if I change my springs it would help with traction?

Thanks,

Manuel

knonfs

Manuel,

I've never heard of "Javier Monroy", does he have a nickname?

Please don't tell me that Javier Monroy is the kid who used to tune Hondas\Acuras at Galdi's dyno

Anyways, so what you are saying is that with the new map, your air fuel ratios are around or below 10's?

If that's the case, what's you new HP, after the new pump, and map?

dmp

Just practice...that's what you need. Get your 60ft time down .1 or more, and you'll have a 13 second car easily.

Practice, Practice, Practice!

RX8PR

Knonfs,

After we installed the new fuel pump we try to run the car without changing the original greddy map or using one of Jeff's maps, but we can't do it because the car was to "rich".

So we changed the map to a new map, now with our own map the car run 's with a FAR between 11.5-11.8 FAR.

I really don't know to much a but Monroy, I meet him because Galdy recommend me him and I trust on Galdy's experience and recommendations. On the future if we changed to other ECU probably we would change our tuner. Until now this guy is helping us a lot
and spended a lot of time working on the car...............and I really appreciate his effort.

Thanks,

Manuel

RX8PR

I forget to answer you about the horse power.........

now is basically the same, 258 HP on 3 gear and 271HP on 4 gear......
we lose near 2 HP but now our FAR is near 11.5-11.8
The attached dyno is on 3 gear........

Manuel

cretinx

trap times ?

cretinx

ok I found them I'm an idiot.

RX8PR

trap......... I needed to look on a dictionary (sorry, my first language is Spanish)

What you was thinking?

Thanks,


Manuel

dmp

Trap Speed...or Traps...

The speed your car averaged through the 'trap' (measured amount of track at the end).

Your MPH

Charles R. Hill

iTrader: (7)

Guys, I am not so sure that with the times recorded by Manuel that he can be assured of running 13's yet. I don't disagree that he should be, it's just that with the numbers he has shown us there is no conclusion to be drawn. Just for comparison let me show some of my own data runs. I'll be heading out to an actual dragstrip to confirm the accuracy of these numbers, too, so don't yell at me over this.

I have run anywhere from 2.249-2.380 in the 60' times while running low to high 13's.
My 0-60 times have also run anywhere from 5.160-5.790 while running in the 13's.
The 1/8 mile measurements that were part of those same 13s were in the 8.746-8.950.
The runs I have performed where my data closely matches that which Manuel has provided were in the 14.0-14.4 region depending on traction.
While comparing typical data with that of other cars I have found that rotary-powered cars tend to have trap speeds about 10 mph higher than piston cars.

Let the bitching begin.

CRH

RX8PR

Well,

Using my g-tech I run between 13.80-13.93 sec. 1/4 miles all the time, of course that g-tech numbers are just extimated values................

The only way to see it is running the 1/4 mile. I have plans to run the car at the Carolina Race Track........... it's a 1/4 mile track that is a trip near 1.5 hours from my house, the 1/8 mile track is just 20 minutes. The problem is that we would install this week and external waste gate so I don't know if the car would be ready to run it next thursday.

Thanks,

Manuel

Charles R. Hill

iTrader: (7)

Manuel,

How have your G-Tech numbers compared to the timeslip you have attached to this thread or others you might have? The racers at my work told me that the Tech is pretty close to the real thing and it has been very helpful in my pinning down problems when they arise. BTW, I am getting consistent 13.7's@103 on street tires before the nitrous. I had to iron a few things out before I can resume data gathering so I should have a few runs in for posting tomorrow. During next week I should also have some comprehensive data on using 27" tires vs. 26" tires.

CRH

RX8PR

With G-tech you need to make a few runs as the manufacturer recommended then you can take and average..........
My experience with my car and my friends cars is that we see lower times on the track than in the g-tech.
The next time that I visit the track I would not be able to compare the timeslip on this thread with the new one........the reason is the installation of the waste gate, in the past
we have trouble mantaining a constant boost. With the external wastegate we expect to resolve this problem and add some ponys .................
We're going to begin the installation on tuesday afternoon and problably the car be ready on friday.

I would like to see your run's, good luck my friend................

Manuel

Charles R. Hill

iTrader: (7)

Manuel, let's keep in touch on this one for two main reasons. 1) You and I can objectively document what the G-Tech's accuracy is so we can lay to rest the notion that it is wholly inaccurate and discuss how to use it in ways that help the accuracy. 2) Those using turbos for that 50-60 h.p. boost are discovering just how responsive the RX-8/Renesis is to modest power boosts just like those of us who have made other mods are discovering the same. For the past year, or so, I have told many stories on my successes using a modest 55 shot of nitrous and the turbo guys are now having their own successes on the street. As I reach for higher levels of nitrous and you guys reach for higher pressures, we can keep each other aware of issues that may come up.

Right now I am ironing out a few problems and I hope to make it to a real dragstrip either Wednesday or Friday of next week.

Talk to you soon, my friend.

CRH