protejay

now i know turboge's hideout! =)

Mustang dynamomometer: operator set it fairly 'loaded'; 3rd gear WOT; 2,300ft elevation, entered car weight at 2,600 lbs for the runs...

uncorrected numbers:

baseline - max power 107.5 @ 6250 RPM
max torque 103.1 @ 4750 RPM

w/tuned - max power 114.3 @ 6500 RPM
RX7 VAF max torque 106.4 @ 4750 RPM

ignition - max power 115.6 @ 6500 RPM
advance max torque 107.4 @ 4750 RPM

baseline info: 205,820 miles on the original engine; Redline 10W30; Pacesetter catback; Direct Hits; F2 Ultralights w/Azenis 205/50/15

For the RX7 install (superdave played a part in this! =) ) i was able to fit it to the resonator box and put a cone filter on the end. I planned on having a custom intake made...but that didn't work; so ended up using the stock intake hose.
While i was taking all the stock airbox stuff out, i disconnected the neg battery terminal and mashed the brakes for 30 sec. When we had it all together, we started it up and it idled totally like normal without having done anything to tune it! Did a run and lost some power.

So then we started moving the wheel counterclockwise and sooo on the next run we made some power...moved it a little more and bingo! 114hp! with hardly ANY black smoke out the exhaust only noticed a bit right @ 7,200 rpm. And the power gain was pretty much everywhere on the graph....

For the timing...well we couldn't find/see the timing marks and i KNOW those markings are grease covered!! ( i saw them when i put on the cam gears) So, Mark went ahead and advanced the timing some...next run...pretty bad pinging he cut it when he saw the power losses start showing on the monitor. More fun..we FORGOT to mark the distributor! So we fooled around with it some and finally got those last numbers...but we have no idea what the timing is at.

Anyways i had fun and like the results! Mark at SWAT Performance is a great guy to work with...we ended up doing a ton of runs(didn't expect so many)!

bty....my torque seems low; the downpipe that connects to the exhaust manifold collided with a rock somewhere in MT and so has some *small* leaks and is dented a little. i'm thinking THAT may be why.

Loundarp

wow i didn't espect 6.8 more hp and 3.3 torque with the rx7 vaf!!!
can't whait to put mine on now!!!

protejay

same thing with me when i saw the numbers; i was like 'Wow...not bad!!' especially when you consider you can get a meter for US$40-50 and a k&n cone filter for the same. $80 and you've got 7 more horses; maybe even more(...or less) with different motors and mods.

Davard

I imagine that the dyno was at least corrected for altitude, otherwise you'd be making another 8-9 hp at sea level.

So, you up for drag racing on the 23rd?

mazdaspeedwest

i'd like to see the graph. just curious about the shape of the curve. As it's very close to my numbers. I need to get up there one of these days and see if my new intake and other stuff made a difference, and if it did, where.

protejay

you know, i'm still a little hazy on that exactly...i asked him if these are 'corrected or uncorrected numbers', he said "uncorrected", so i said 'i would show more at sea-level?'...he said "yes" and that he would email the formula if i wanted it.

one thing to keep in mind with the numbers to is that we used 3rd gear...4th gear is more 1:1 - and 'harder' on the engine when dynoing - so he opted to use 3rd.

as far as the 23rd i'll have to see what's happening

protejay

Darryl..i don't have a scanner but i do have a fax machine. i've got the 3 graphs showing those runs...let me know if you want them faxed.

turboge

Hehe, my secret is out! lol

Yep SWAT is where I do all of my dyno tuning with Mark. He is an excellent tuner and has taught me most of what I know. We will usually tag team a car when tuning because we both know what to do and look for. Too bad I couldn't make it up there to play around on your car. I talked to Mark while you were up there and he was telling me about your car.

What is interesting is that your torque peak never changed, only the HP. I believe that is due to the nature of the stock ecu and the timing of the VICS system. On my car we richened up the low end and timed the VICS for 2500-5100 and ended up moving the torque peak down to 4000rpm.

Most likely you are running retarded ignition up top, we ended up hitting our peak 121whp on my car by retarding the top end above 5500rpm or it could be the advance that we added across the board compared to the stock ecu....??

I'll be up there this weekend or next week on my vacation putting the head and turbo on, I'll be at LACR on the 23rd for sure if everyone is going, I need to shake this puppy down and see what she's going to run! Hope to see you there, I'll try to start a post up later in Socal for it.

protejay

sooo Braden, i remember Mark saying something about VICS.... that it'd be better if it switched at a lower rpm??? is that sorta what you're referring to in your last post? sorry...i'm a little slow

as far as the mod goes, i'm liking it big-time! i remember Darryl talking about 'having no throttle response' when he had to put his OEM exhaust manifold on after having the headers....well i'd have to describe this similarly: the engine just BREATHES easier. it feels like its got new life; no 'bogging' when you're in gear and slowing down. removing the stock airbox i'm sure has played a BIG part in this...but so has the RX7 VAF. next time i'm on the dyno, i'd like to take the original VAF and swap them; so as to have a side by side comparison of the two.

turboge

With my exhaust we found that turning the VICS on early and shutting it off early proved to keep the torque and horsepower levels in good order.

It may be a little different for your setup.

mazdaspeedwest

how exactly is the VICS activated? rpm? and how is the EK6 controlling it?

turboge

Yep, RPM based pulsewidth modulation. E6K controls it by using a grounding circuit.

mazdaspeedwest

OK, so is that a straight constant ground from the EK6 until it drops below the set RPM, or is it a pulsed?

theoretically, you could activate it at anytime with a switching circut or a pulse controller. Could move the bottom end down to 2000rpm

turboge

It is pulsed. 2000rpm caused driveability problems but yes it does move it down a little lower.