HWO

Just as a matter of interest, who did the porting?

porting a motor lifts the peak torque up the rev range, you are making peak torque at around 5250rpm, a ported motor should be making peak torque between 6000-7000 depending on the exact timing of the intake and exhuast.

crispeed

My Bad!!

crispeed
87TII
9.20@150mph

crispeed

Do you have an EGT gauge?
Didn't they use a wide band to tune the car?
What was the A/F ratio on the run?

crispeed
87TII
9.20@150mph

machinehead

I am almost embarassed to say it, but porting was done by mazdaracing.com. Not very happy with it so far... after 600 miles the thing started leaking coolant out the rear housing, I pulled the tranny and found the leak, all the tension bolts were loose, one was about 1/8" backed out and the coolant was coming from the bolt hole. Called them, they swear they torqued the bolts. I retorqued the bolts and no more leak but my knock sensor is going crazy even with no load, and now I found some wierd faint scraping noise coming from the front rotor housing. Still runs fine but I am loosing confidence in these guys fast. I wish i could recomend them but so far they have done nothing to indicate they stand behind thier work or plan on it. I think they do better with the 1st and 2nd generation RX7's.

I don't have a egt gauge yet. They (XS) did use a wideband but they did not give me a printout or specify what the A/F was during that run. I was not allowed in the dyno room so I can only say what i was told. I know the like to tune conservative which should put me in the 11.0 range. They said they did a run at 370RWHP but started to get some detonation and backed off the timing. The guy doing the tuning was complaining about the knock sensor not working right, which I can understand. He thought maybe it was picking up some signal from the non resitor plugs(NGK10EGV) but I changed those back to stock when I got home and still had the same readings. I then listened to the housing with a long screwdriver to my ear and I can hear some noise coming from inside the front rotor housing where the knock sensor is mounted. I also listened for the same noise from the rear housing but it does not sound the same, it is nice and smooth sounding. I love my car, but these little things are killing me. i don't know if i shoud drive until it explodes or what. Maybe as the engine breaks in the noise will go away?
I appreciate the input.
Cliff

spooledUP7

Funny looking dyno chart. Isn't there normally, a big dip where the turbos switch? Am I looking at it wrong?

Sidestick

iTrader: (1)

It's a dyno run of a T04E single turbo-no switchover

maxcooper

You probably figured this out right after you posted, but if you move the torque curve down, it will cross the HP curve at a lower RPM. By your post, it sounds like you were thinking the torque curve was the HP curve (had them swapped in your head). By definition, the curves should cross at 5250. If they don't, the curves are wrong (or perhaps just not from the same run). I haven't done the work to check on this one, but I would expect to find them crossing at the correct RPM.

-Max

Kahren

iTrader: (13)

so was that dyno chart u posted a 13 psi or 15 psi run?

1FooknTiteFD

did XS tune the car? those are pretty nice numbers