Lschiavo

After Several runs my best HP is 135-140 and torque is around 98-105.

Can someone tell me what I am doing wrong?? I see many people getting up t 170 HP.

Here is my data for you to review, thanks for your help

rotayking

Is your Rx-8 automatic or manual transmission???

Lschiavo

Manual, Thanks

r0tor

iTrader: (1)

you probably have the wrong vehicle weight in

Lschiavo

I have 3250 lbs, does not seem too bad of a guess. I have put the same weight that all the guys who have posted their results online..

Speed Racer

Make sure that the bracket is tight and there is no play. Calibrate the RPMs to your tach. Do one short run (i.e. just far enough for it to start recording) this will level out the accelerometers in the Gtech. Once that is done you should be all set to get a decent run. If you are still having problems you should recalibrate the accelerometers. Hope this helps.

Lschiavo

I calibrated the accelerometer in my house, like the manual says.
SHould i do it in the car??? I am not sure about it. Did you look at the rpms in my run? I compared them to another run that i downloaded from the forum and noticed that i lose quite a bit in 2nd gear before shifting to 3rd. I mean, it takes me wayy longer to get to 9k than the other guy...
Any thoughs? Could you provide me a little sample of your data?

ezrider55

Do a search on "coil". I hope it is not your problem but it should be covered under warranty if it is the prob.

Lschiavo

Did u look at my data??? What do u think?
LS

PoLaK

iTrader: (1)

I can't view the data as i don't have the prog if i could see a jpeg i may be able to help you out some more.

But if your coils are fine and the Gtech is calibrated properly.

I'm not trying to point fingers saying that someones product is crap but i'll point my finger at that GT4 kit from SR motorsports.

Lschiavo

GT4 Kit is not installed yet. It will be installed on thursday....
Here are the pics....
Thanks for your help.

P.s In this first graph the othe guy is the red line, in the other graphs he is the black line.

Lschiavo

one more

Lschiavo

another one

Lschiavo

last one!

Lschiavo

HEEEELPPPP PLEASE!!! WHEN I SHIFT TO 2nd MY CAR DOES NOT PULL AS OTHERS!!!! My 60' times are very good (2.28), my 330' are realtively equal but I lose a lot of ground to 1/8 and 0-60 mph.
Someone help please...

HP is 142 MAX

Speed Racer

Luis,

You'll get more repeatable Hp numbers if you short shift until you get to 3rd gear and then ride that all of the way to redline. The Hp numbers from an aggressive 1/4 mile run are exagerated and inaccurate due to the shock to the drive train. For example look at the red line and notice how the peak Hp is in 1st gear, also notice how jagged the line is from lots of wheel spin.

Black - Luis' baseline run
Red - aggressive 1/4 mile run
Green - Hp run main pull in 3rd gear

Lschiavo

Thanks speed racer.... At how many RPMs should I shift from 1st to 2nd and from 2nd to 3rd??? Like 5K??

Speed Racer

When I'm doing a HP run I normally shift at 3k RPM so that I can get the widest range in 3rd. The only thing to be careful of, is starting out quickly enough in first to get the timer started on the Gtech.

Lschiavo

OK, gonna try that. However my question is that the guy in the graph I posted is not shortshifting and his engine seems to rocket compared to mine in second gear. Look for the rpm graph and notice that big difference. Is that normal?? Have you compare runs with mine shifting at 9K??? I want to know if my car is down in power or if he has a super engine, that's all.

Speed Racer

The numbers will vary if both runs were not done under identical situations: flatness of road, temperature, humidity, Gtech setup, etc... The shape of your plot is very similar to mine, it is just uniformly lower and that would make me question the setup of the Gtech: accelerometer calibration, RPM calibration, weight, or a loose bracket. Do you know anyone else in your area with an RX-8? It would be interesting to compare the two cars side by side and see if they perform the same.

Lschiavo

Hey Speedy.... I did some more runs today. My times are pretty similar to the guy who provided the other data (even though he claims to have 170 WHP against less than 140 whp in my car. My times to 60" are 2.2 constantly vs. 2.4 of his data, 330' is around 6.5 vs. 6.4 from him, 1/8 is around 9.9s vs. 9.7 from him. By looking at this number i suppose i am not 30 HP down in power, does not seem logical to me at all. But it bothers me anyways to see his car rocket in second gear and getting to 9K (in 2nd gear) almost a full second before I do.
Do you think I should do a dyno test on my car to clear doubts??? DOes the dyno do any damage to the engine?? Thanks

Speed Racer

In my experience the Hp numbers from a 1/4 mile run are not very consistent and seem to bounce all over the place depending on how hard you shift the car. If you want to see a gross example of this just look at the graph I posted. The red and green runs were done with the same car, on the same day, and the same stretch of pavement while the car was still stock. The red 1/4 mile run shows 245 Hp where as the green 3rd gear Hp run only shows 157 Hp. The 3rd gear runs may give you low HP numbers but at least they are repeatable. This comes in handy when you want to see if a mod actually added any Hp. So in the end you really have to do twice as many runs to get an accurate idea of your acceleration times and Hp numbers.

Do you know if both cars are completely stock? An eManage (aka CanZoomer) and cat-back exhaust can easily add 30 Hp in the higher RPMs and that would explain the difference. If both cars are stock, I'd then try to find out what "flash" the ECU is using. The original K flash was stronger in the upper RPMs; where as the current M flash is stronger in the mid range.

Dynos also have a lot of variation between them for many of the same reasons. People on the forum have posted numbers ranging from 165-200 Hp but they normally fall between 170-185 Hp. With that in mind it is normally best to compare numbers that were taken by the same dyno when ever possible to limit the number of variables.

FYI - dyno runs can be hard on an engine because you are running at full load all of the way to redline and you have poor cooling because of limited air flowing through the radiator. A couple of runs on a dyno isn't going to kill the engine but it will cause more wear than normal driving but so will doing a bunch of 1/4 mile runs with a Gtech.