H4Inf

The long awaited day! :-) All went well until I finished the tune and found a few problems when I was trying to leave...
- Main fusible link loose - so intermittent operation of stuff heh
- TPS plug fell off - how stupid

Engine details:
- 13B 6-port
- No aux port actuator sleeves
- Only running secondary injectors (thats the 2 on the intake)
- MicroTech Digi Series 1 Pro ECU
- TB Mod

So here are the graphs:

HP and lbs-feet
130.1hp@6689 / 236.8lb-ft@5662


KW and Nm
97.0kw@6689 / 321.1Nm@5662

mcnannay

not bad...but i gotta ask, why only two injectors??????????

does that actually improve performance?

680RWHP12A

hell no , it just makes tuning it alot harder

nice dyno #'s for n/a!

H4Inf

I don't think it improves performance, but I wasn't wanting to trace all the wires back to see how it was wired up, and spend extra money on setting up staging... Only affect it really has is down low you when there is no load on the engine, there is a bog-down spot between idle and 2000rpm. When taking off, just need to be outside that zone, or take it very easy.

Max7

Strange having more TQ then HP on a rotary

H4Inf

It was surprising. Basically the map in my ECU was for a 12A Turbo... Previous owner was a bit crazy - anyway. Down low it was running rich, up high it was running lean. In one of the early runs I saw numbers around 460Nm for torque, but we jacked the fuel back up so my engine will last a bit longer. AF ratio was jumping over 15 every time I took foot off the pedal too, smoothed out now.

trochoid

iTrader: (6)

Any idea what causes the drop around 5500 rpm?

H4Inf

Tyres jumped

karism

Very nice!
Hell, thats allot of torque you have there!

karis

trochoid

iTrader: (6)

Is the seat still clean?

H4Inf

Mmmmmmmmmmmmmmmmmm, I'll let the next passenger find out about that one

cpt_gloval

iTrader: (1)

what size injectors are you using? and why are they in the secondary location as opposed to the primary?

curious.

BlaCkPlaGUE

Did you only use one set of injectors to lean it out or something? save money on a fuel controller?

pengarufoo

um, the torque scale on the graphs is not right.

200 lbs-ft @ 4000 RPM is 152HP, the dyno graph does not reflect this, not using the right scale for the torque curve.

You have 70 HP @ 4000 RPM, this turns into 91 lbs-ft @ 4000 RPM, not 200 lbs-ft.

It looks like the torque curve is also plotted on the HP scale, because the torque curve @ 4000RPM looks like it's right at 91 on the HP scale, which is correct for the lbs-ft value with 70HP at that rpm.

Sorry, you're not making > 200lbs-ft on your NA 6 port, bummer.

H4Inf

Injectors are 550cc. Why im using the secondary location? Thats the way it came! heh. Wish there was some documentation on the way things were when I bought it.

Only reason one set is running is because we don't know how the primaries have been wired up, and the ECU had staging disabled.

And pengarufoo - the graphs are right.

HP = (Torque * RPM) / 5252

So lets look at 4000rpm.

HP = (91 * 4000) / 5252

which equals 69.3HP, which is dead on with the graph.

How torque and hp relate: http://vettenet.org/torquehp.html

hornbm

on a 20B or something id belive it, but there is just NO WAY IN HELL yoou could me making over 200ft/lbs of torque on a STOCK port N/A!!

Im not calling you a liar, they dyno just has to be wrong... rotaries just dont make torque from doing a throttle body mod and adding an EMS


By all means if Im wrong, would someone explain to me exactly how this is possible?? I mean... it just doesnt add up!


Just for arguements sake, would you ever consider taking it to a different dyno place?

H4Inf

I take back my last post ;-) I misread something...

HP = (Torque * RPM) / 5252
Something certainly isn't right...

sooo 4000 rpm, and ill go with the HP reading on the dyno because it's most realistic.
70 = (T * 4000) / 5252
( 70 * 5252 ) / 4000 = Torque (91)

So I would have to agree with you then that the torque curve has been plotted on the hp scale.... and I'll be calling them up tomorrow and asking about this heh..

I don't particularly care about what it makes, but it's nice to have a tuned car at last

So. Max hp was 130.1.

130.1 = (T * 6689) / 5252
(130.1 * 5252) / 6689 = Torque (102.15 lb-ft)

So max torque was 102.15 lb-ft @ 6689 rpm

cbrinega

The labels on the Torque axis in lb/ft are wrong. The car is making 102.15 lb/ft at 6689 RPM with 130.1 rwhp.

The way the graph is setup, both the correct HP and Torque should be read from the left axis.

H4Inf

Yep. Max torque in metric units is 141Nm @ 5662

That's pretty dodgy of them lol.

cbrinega

I think we came to the same conclusion at the same time. I must type too slowly! :-)

H4Inf

It's quite wonderful to finally have a smooth response to the accelerator. Becoming more of a pleasure to driver over time as I iron all the bugs out.

Another modification I did today was to run a huge ground from the battery to the block, and an additional wire from the alternator to the positive on the battery. Huge difference with electrical load, nothing is affected

H4Inf

Hold on I screwed up the calculations on the lb-ft one, thats the torque that I get at the maximum hp RPM... need to recalculate based on the max torque rpm figure there for the actual reading.... Why couldn't it just have worked hehe ;-)

Not exactly sure on calculating this one, its late.

Directfreak

iTrader: (2)

Rule of Thumb:

After 5252 RPM:
Horsepower is ALWAYS Higher than Torque.

Before 5252 RPM:
Torque is ALWAYS higher than Horsepower.

Just a quick guide.

FD Racer

You need to get the other two injectors hooked up. Only having two 550cc injectors and running them at 80% duty cycle will only get you a max of 126 flywheel hp (on paper).
check for yourself:

http://rx7.com/cgi-local/2ndgencalc.cgi

candyassmiler

looks like you produced around 110 foot pounds at 5252rpm.