my 5sfte 200+whp dyno runs, 203whp 246ftlbs! Options

[presure2]

ok guys, went back to the dyno with the 460cc injectors, and did some runs to see what was up....first couple runs were about the same as before, about 195 or so whp and a little over 210ftlbs...but now it was NICE AND RICH, which i was VERY happy about.
so, i removed a little fuel up top (between 4600-6k) and upped the boost a little bit, to 12lbs.
she responded by giving me these runs.



after looking at the runs some, you can really see how the power drops off right @ 4450rpm.
i think this MAY be one of two things.
the SAFCII screwing with my timing, and the ECU making it pull timing to fight back,
or just plain ole detonation.
now, i havent noticed anything strange as far as readings on the SAFCII, and i havent actually "heard" anything strange, yet. then again, they do say by the time you hear it, its usually to late..lol
so, im planning on going back, and trying a few things to see what i can do about the power dropoff.
even with it, the car pulls HARD, and by the looks of the egts things are actually safer with the bigger injectors.
i really think that if i can figure out the issue i have there above 4400rpm, i should be making about 225whp to go with the 240+ftlbs...
any thoughts???
lets hear em!

This post has been edited by presure2: Sep 20, 2005 - 8:44 AM

[nik]

looking good do you have any way to detect detenation

This post has been edited by nik: Sep 20, 2005 - 9:25 AM

[Jdog1385]

i read a similar problem in TPR magazine with the drop-off in power.

possible problems;

- im pretty sure that an increase in boost may cause less horsepower, indicating that the knock sensor is causing The ECU to retard the engine timing.

- Boost controller might be causing the drop-off.

i really gotta see your car man. good luck with it.

This post has been edited by Jdog1385: Sep 20, 2005 - 9:50 AM

[jgreening]

Good job Manny. That dyno graph looks like classic knock response to me. You need to either find a way to control timing, use race gas, or turn down the boost.

[nik]

Good job Manny.  That dyno graph looks like classic knock response to me.  You need to either find a way to control timing, use race gas, or turn down the boost.
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i vote try and fix the timing and keep it a 200whp+ on pump gas if you can if not have the 200whp as your high boost setting

[lagos]

yeah, it could be just do to the fact that its a high compression motor running running a whole lot more power then pump gas can handle at this point. throw some nice race gas in there!

[Jdog1385]

im pretty sure sunoco race fuel is up to 7 dollars a gallon.

[presure2]

yea, im thinking about throwing in some 109octane (its 7$ a gal.) next time @ the dyno if i cant clean that up at all by playing with things, and seeing if that cleans it up.
i figure ill head over to the dyno with about 1/4 tank, and if i have to, add like 4 gallons of the 109oct. for about a 50/50 mix...hehe
first thing i think im gonna do is add in the fuel that i took out at the dyno, and see what kinda diffrence it makes, the runs before i started taking fuel out look a little smoother, albeit a little bit down on power compared to these two runs, but then again, i hadent upped the boost yet.
as far as knock detection, the only thing im using is the knock display on the SAFCII, i installed it before i turboed so that i could get an idea of the readings pre-turbo, and to be honest, i really havent noticed much of a diffrence at all in the knock readings.
keep the ideas coming guys, i wanna hear em all!

[lagos]

you might want to post this on celiatech so that nuke can write a 500 page book about it ...lol

[presure2]

you might want to post this on celiatech so that nuke can write a 500 page book about it ...lol
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hahah yet, i just posted it there too, we'll see what he has to say..lol

[lagos]

did you dyno the 10psi of boost you were at the 1st time you dynoed to see how what type of change the injectors made?

[presure2]

did you dyno the 10psi of boost you were at the 1st time you dynoed to see how what type of change the injectors made?
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yea, it was about the same, maybe a touch more torque, but MUCH richer

[lagos]

was it pulling timing like it did in the 12psi runs? what run file is it under

[presure2]

the first run i did is missing a spot from the graph, but it looks like it is, just not as bad as the later runs.

[ice23q]

What injectors are you using........??

[lagos]

check his profile... hes got it all in there
460cc RX-7 injectors Pt. #195500-2010,

[presure2]

check his profile... hes got it all in there
460cc RX-7 injectors Pt. #195500-2010,
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thanks art

[StreetRacing10PS...]

my 7afte pulled a 93HP on the dyno still dnt no whats wrong wit it

[97sccelica]

my 7afte pulled a 93HP on the dyno still dnt no whats wrong wit it
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what was the AFR like?

presure2

it looks like you increased the cylinder pressures too much for pump gas, whats the timing retard set to on your BTM?

[Digndoug]

Did you take it to the track yet? what kinda numbers do you think it would pull?