t78 3rd gen 415rwhp at 10psi
11-22-04, 12:57 PM
#51
Eats, Sleeps, Dreams Rotary
Ok, so that AFR kooks kinda leanish 
what do you guys consider the safe limits of AFR? I was alwasy told between 10:1 and 11:1 to stay on the safe side. But then my knowledge on tuning and AFR is little to none
what do you guys consider the safe limits of AFR? I was alwasy told between 10:1 and 11:1 to stay on the safe side. But then my knowledge on tuning and AFR is little to none
11-22-04, 02:11 PM
#52
Lives on the Forum
Originally Posted by apneablue
Ok, so that AFR kooks kinda leanish what do you guys consider the safe limits of AFR? I was alwasy told between 10:1 and 11:1 to stay on the safe side. But then my knowledge on tuning and AFR is little to none
what do you guys consider the safe limits of AFR? I was alwasy told between 10:1 and 11:1 to stay on the safe side. But then my knowledge on tuning and AFR is little to noneIf this is a street daily driver, keep it under 11.5:1; there's no reason to risk killing your engine for that last 10hp or so.
As a rule of thumb, normally aspirated "best power" (on a piston engine) is 12.5:1 to 12.8:1.
-Ted
11-22-04, 07:33 PM
#53
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Originally Posted by gen3RxProj
insane. I have a large street port and t78. maybe my engine isn't pulling your compression or something, but I'm quite sure its rather strong at 6k miles....
i pulled 408hp and 350 torque at 15 psi with terrible intake temps... I also ran the tuning rather conservative as I want to be able to beat on the thing. I know I could get more, but I just dont understand achieving that hp number and that torque number. What was the trick?
... no ignition breakup in my setup either...
i pulled 408hp and 350 torque at 15 psi with terrible intake temps... I also ran the tuning rather conservative as I want to be able to beat on the thing. I know I could get more, but I just dont understand achieving that hp number and that torque number. What was the trick?
... no ignition breakup in my setup either...
Last edited by VeeTec; 11-22-04 at 07:35 PM.
11-22-04, 08:07 PM
#54
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I realize this thread was started a coupla months ago.
Having said that, go and drag race it at 10 psi. If you are not trapping around 125 mph, something is not right with the dyno sheet. Trap speeds don't lie.
Having said that, go and drag race it at 10 psi. If you are not trapping around 125 mph, something is not right with the dyno sheet. Trap speeds don't lie.
11-22-04, 09:16 PM
#56
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Originally Posted by vosko
still bickering about this oh well. hell i'd drag race it for him but even at 10psi he will blow the rear end and trans. ask me how i know
11-23-04, 11:14 AM
#57
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yeah the *thrust* i guess ??? was ridiculous in my car.... nose would pick up. rear would squat. it was so much fun to drive. GT40 is a big turbo it should make alot of power
11-23-04, 02:17 PM
#59
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Originally Posted by Mr rx-7 tt
10 psi and 415 rwhp? I just don't see it...
example: Santa Fe is at 7000 ft. The SAE corrected hp and torque will be about 10% overstated there for turbo at 10 psi.
---------------------
At sea level and 75F for an FD at 10 psi and 7200 rpm with:
100% true VE, 80% compr and IC efficiencies
.5 bsfc, and a/f=12
no IC or intake pressure drop
engine hp is 397 for these ideal conditions.
this number will be lower with usual higher bsfc (.6), and more realistic VE. You would need an indy turbo, race port, and tuned headers to get back pressure low enough to be assured that a full clean 10 +14.7 psi was filling the chambers, for 100% VE.
11-23-04, 04:32 PM
#60
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Originally Posted by vosko
still bickering about this oh well. hell i'd drag race it for him but even at 10psi he will blow the rear end and trans. ask me how i know
Rich
11-24-04, 10:17 PM
#62
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i drove in that car and it felt every bit of 410+rwhp, believe it or not. i've only driven like 12 FD's in my life from stock to 450+rhwp. wait maybe more than 12 haha
11-24-04, 10:48 PM
#63
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Whether these numbers are b.s. or not doesn't matter. As soon as he goes to the track, his mph will tell his real power. This dyno was either not callibarated right or the graph was fudged or the boost level was twice that. Its simple math people. All you have to do is look at the compressor map of the T78 and you can see it will not push enough air at that boost to make that power.
11-25-04, 12:09 AM
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Anytime you see torque climb with rpm is a clear indication boost is also climbing !!!!
The problem/issue is not believing the hp #'s *but* the boost amount.
Torque #'s also give an idea of boost amount....few of us know that.
JD
The problem/issue is not believing the hp #'s *but* the boost amount.
Torque #'s also give an idea of boost amount....few of us know that.
JD
11-25-04, 11:40 AM
#71
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if FD driveline parts weren't complete crap i probably would have done better. atleast i tried drag racing unlike everyone else who has never been on the drag strip 
11-25-04, 12:28 PM
#72
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Originally Posted by pp13bnos
118 is about 375-385 rwhp.....congrats.......
Rich is it even that much power? I trapped almost 117mph on my stock non-seq twins 2yrs ago. My car mayble felt like....330ish rwhp. Just my .02, CJ
Rich is it even that much power? I trapped almost 117mph on my stock non-seq twins 2yrs ago. My car mayble felt like....330ish rwhp. Just my .02, CJ
Actually, 117 is right around 350 or so. I was drunk as hell when I posted that(4am), so I was a bit off
btw, that is a great trap speed for stock twins, non-seq or not.
11-25-04, 12:35 PM
#73
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Originally Posted by vosko
if FD driveline parts weren't complete crap i probably would have done better. atleast i tried drag racing unlike everyone else who has never been on the drag strip
(a) your excuses are getting old, i wouldnt sweat it one way or the other
(b) your entire post is ridiculous........fd driveline parts are fairly stout, and i am sure many of us have more passes down the quarter than you
(c) it is impossible to make a true 415 rwhp at only 10 psi on a streetported 13b
(d) Happy Thanksgiving
