Dragonz818

I just recently put on my midpipe and then went on the dyno. I put down 288 RWHP at about 15 psi. I expeced much better numbers than I got. You can see my mods in my sig.

Last time I was on the dyno I ran with the stock cat, but I had 100 octane and I made 278 RWHP. So I wasnt very impressed. All the guys their were telling me to get my ic then come back and I will be very surprized at the difference. I am also still sequential by the way.

Tell me what you think. My car hasnt been tuned yet either still base map. The 02 readings were around 11.2-11.5 so I am still safe. The injector duty was 83%..

Marshall

A few things stand out:

15 psi on the stock IC -your charge temps were probably approaching 300 degrees F

Timing on the PFC base maps can be very agressive -you can run 10.0 AF and still detonate the motor to pieces.

I would recommend a compression check first, if it is acceptable, then a good IC and tune.

maxcooper

Ignition problems have ruined many dyno runs, too. How new are your plugs and wires? Did the car feel like it might have been missing or the power fell off too quickly at high RPM?

-Max

3isacharm

first off, you were on race gas last time, and i'm guessing you weren't running it this time? try the dyno again with the same gas. you need to delete the variables to make a better comparison.

Dragonz818

I didnt run with race gas this time so I expected the hp to be around 310. I was shocked to see only a 10hp by removing the main cat.

I replaced the spark plugs but not wires. I will do that asap. Could I lose alot of hp from that alone?

What would you expect my car the make with new wires and 100 octane?

RecKleSs

Can you post a pic of the dyno run?

Dragonz818

I will see if I can get someone to scan it for me.

rynberg

Running higher octane fuel will not increase the horsepower unless you adjust your timing to take advantage of it.

It would be good to let us know the details -- what kind of dyno, ambient temps, etc.

Also, as the other guys said, pushing 15 psi through the stock intercooler is bad news. I lost almost 10 hp between dyno runs just running 10 psi, and that was in 60 degree weather with a fan blowing on the car.

Dragonz818

I was told that PFC will compensate for higher octane. It was a dynojet dyno. I dont remember the temps but it was done at night and my car was stitting out side in the cool weather for more than an hour. I am also pretty sure any time you get on the dyno they use fans.

What are some round about HP numbers with my mods with the IC included. I am putting a greddy 3 row in 3 weeks.

vosko

iTrader: (4)

lemme drive it and i'll tell you what is wrong

Tad

dude you NEED TUNING!!

I have been out of the rx7 world for a while,
and into the turbo 4banger world...
but they're both similar, tiny engine, moderate boost, and light car.

tuning makes such a difference it aint even funny.

and you have a power FC,
what good is having a high priced computer controlling the vitals of your car, when you havent even tuned it!?!?

I bet you'll easily be over 300 with an IC tuning,
and some new sparkplugs(just incase),
been a while, but I believe NGK makes some killer plugs for FD's ? someone could chime in and correct me if i'm wrong

ps. disreguard if I repeated anything anyone else said,
I didnt have time to read all the replies.

maxcooper

It won't. It doesn't do anything to the timing in response to the knock sensor signal, so it won't run your timing more advanced based on the fuel you are running. Some cars do that, but I don't think the PowerFC does it at all. The knock signal isn't trustworthy enough to do this to any great effect anyway. It is safer to just run reasonable timing in the first place. You can add a J&S Safegard system to retard the ignition when it senses knock, but I have one and I still don't push the limits with the timing. It isn't worth the risk to me.

Tuning may indeed be the thing that is holding you back, however your A/F readings from the dyno run sound quite good if even a bit on the risky side. So that might not be it after all.

I agree you should be making more power than you put down, but I would look at in terms of what you should expect versus what you got on the last dyno run, rather than comparing against the older run.

-Max

Tad

another thing to consider,
is that your car is modified.. but not overly so.

I mean, your still basically just intake and exhaust.
except you've got the boost cranked up hella high.

I would expect more from 15psi though

1FooknTiteFD

i agree with max, since you are running such high boost levels, your ignition might be cutting out and misfiring. Try chaning the plugs and wires. Better yet, if you get a dyno chart that will be better because we can see if there is some jags at the top end.

Mr rx-7 tt

iTrader: (5)

I have seen 342 rwhp at 15 psi on the stock block with the same bolt-ons... but the car also had an M2 race IC. It was also was running a hi-flow cat. This was done on 93 octane pump gas. I suggest a bigger IC, some HKS race plugs and upgraded plug wires. (Also put in a new fuel filter). Call XS Engineering or KD Rotary for the plugs.

eric e

don't know if these are the plugs you mean but my recently bought FD has

NGK R R6794-10 leading
NGK R R6794-11 trailing

i wasn't able to find mention of them on the ngk site but have found a site selling them in gredies boxes for 3,700en, (US$30) each in japan

in the general rotary forum i asked about them and someone replied they were best for rotaries making round 400bhp

if you do a search for R6794 you should be able to find my original post with photo

i would have thought they'd carbon up pretty quickly as i just haven't been able to go out and thrash the car yet but they seem to be starting and idling fine

eric e

matty

i will be dynoing with same mods plus ic and fuel @ 15 psi on april 23rd...looking for greater then 330 rwhp.

Haggard

Sounds like you are running on trailing ing. only or something to that effect. Get a timing light and see what is going on.

artguy

your ic is choking your whole system. Im not surprised that you are having flow issues and did not get the hp gain you expected out of the midpipe. you cant breathe out if you cant breathe in.

stock ic strangles everything. get an IC.

you could use more tuning as well.

15psi on stock turbos thru the stock ic is actually 17+psi on those turbos because of the pressure drop. your cooking yourself.


j

RX7 RAGE

iTrader: (22)

I got 300 rwhp with dp,mp,cb,intake,ecu, STOCK IC running 11 psi of boost so I think there is a problme.

matty

wow that's good...i made that with same mods but @ 12psi...motor had only 20k miles too.

RX7 RAGE

iTrader: (22)

yea, i was surprised myself. My motor at that time had 65k on it.

Dragonz818

The IC will be changed very soon and I am not going to drive the car over 10psi until I get it. I am also gonna change my plugs and wires to be on the safe side.

Artguy do you tink that will fix the lack of hp or is possibly something completely different.

Now all I have to do is find a good tuner to get out all the kinks. Most likely I will try KDR.

Thanks for the info guys.