dyno results for my FE3

[RbluEMx6]

Finally got her on the dyno.

101 deg F, 29.35 in-HG, Humidity 12%, STD 1.05

First couple of runs on 8 psi were around 185 hp and 206 lbs/tq average. AFR/s were steady around 12 -+.

Then we cranked up the boost and got a best of 265 hp and 290 lbs/tq at 15psi . We would have gone more but I was having trouble maintaining boost. I was using a manual boost controller(two actually) and the boost would hit 15 psi and drop down to 10 psi. but finally got it to maintain 15 psi on the last run which got me 265 hp run.

Edit: posting graph



Ill be adding this info to my project thread soon. Hopefully Ill get better results on my next session and work out all the kinks.

Questions comments concerns are always welcomed.

[Keeloh]

What turbo u running?

[defiler]

In his CarDomain link in his signature, it says:

- T3/T04E 57 trim turbocharger

[fredio54]

Those figures sound really low :-| any idea why? You don't have a pressure leak somewhere do you? That would cause the turbo to have to work harder to make boost and block the exhaust more to do it meaning less power due to increased back pressure and residual ex gasses in the cylinders. I can't think what else it could be. Which octane fuel? How much advance?

Fred.

[fe3t b2200]

looking at his torque curve he needs to retard his cam timing a bit to make th torque hold with rpm. that will make him allot more power. just look where his peek torque is. it wants to be at 5500-6000 rpm not where it is. just look his torque doesnt hold. it falls flat on it face once it peaks thats clasic example of far from ideal cam timing

[fredio54]

Originally Posted by fe3t b2200

looking at his torque curve he needs to retard his cam timing a bit to make th torque hold with rpm that will make hime allot more power. just look where his peek torque is it want to be at 5500-6000 rpm not where it is. just look his torque doesnt hold it fall flat on it face once it peaks thats clasic example of far from ideal cam timing

FEAP ???? Didn't think about that, what have you got in there? They will choke you like you wouldn't believe.

[bakmans]

why you guys always so focussed on the torque??

show me HP curve!! its al about hp!!! torque is a non moving force so as long as its not muliplied by rpm it means nothing. and torque multiplied by engine speed happens to be called horse power!

so what if you have 20000000 Nm or lbs feet @ 0 rpm. your still not moving!
hp is multiplied by rpm so that lways meens a lot!

must say that a torque curve tells you am lot about the volumetric efficiency but for the rest..... to much torque talk and to little HP talk!

[bakmans]

ps my torque curve ont my f2t with stock curve also spiked and then fell low as rpm climbed. this was deu to the to small turbo. im not so familiar woth turbos as you guys but this doent seem to be the case with this turbo.

but ive seen al lot of torque curves ( since i work in a shop with a dyno) with wrong timed cams you kstly get real strange torque and hp curves but this one doenst seem so weird. a too smaal exhaust or something like that could also cause this

[fredio54]

Note, I'd never stick up for fraud if he wasn't right, but he did say AT X rpm which is effectively hp. You cant easily look at a power curve and guage how the engine is flowing and behaving. A torque curve can easily and quickly tell you that, and, if it extends flat to the end, you by default have maximum possible hp for that torque level and rpm limit. In other words, torque curve shape is critical. Torque value not so critical.

[fe3t b2200]

well put fred. that torque curve above would be good in a restriced rally car thats about it. none of the numbers are important really but the shape of the torque curve is regardless of hp, like fred said it shows where the engine is operating efficiently and where it isnt

[bpt323]

wow, im glad im not the only person to notice an initial problem with the TQ curve.
more info on what cams are being run please. if you could extend that Peak TQ another 1500rpm before fall off it would be pretty fun

[RbluEMx6]

Originally Posted by fredio54

Those figures sound really low :-| any idea why? You don't have a pressure leak somewhere do you? That would cause the turbo to have to work harder to make boost and block the exhaust more to do it meaning less power due to increased back pressure and residual ex gasses in the cylinders. I can't think what else it could be. Which octane fuel? How much advance?

I did have a leak but that got fix really quick. I'll have to run some leak down test to see if there is any other leaks or not. And on the exhaust part, do you think it could be that I am using a log manifold rather than an equal length runner? I remember you asked about boost response on my log style manifold. I plan on having a top mount equal length made soon.

The octane was pump gas 93.

Originally Posted by fredio54

FEAP ???? Didn't think about that, what have you got in there? They will choke you like you wouldn't believe.

I know they are not the FE5A's. Perhaps its time to invest in some cam work.

[fredio54]

Was it an auto engine originally? If so, they are probably FEAP/FE3N pair which really is pretty bad for top end (power).

[zlyricist]

first thing i thought was about cam profile when i saw that curve. numbers definitely arent bad by any means, but you could be doing better with that setup. that think peaks out like a f2 motor. i was always under the impression that the fe3n cams and better made max torque around 5500-6K like fe3t said. good luck w the next session, and if you need fe3n cams let me know

by the way, is that a stroked fe3?

[anarchyx34]

Originally Posted by fredio54

Was it an auto engine originally? If so, they are probably FEAP/FE3N pair which really is pretty bad for top end (power).

Werd. Mine came with the weak-sauce FEAP cam and I was shocked at the difference when I put a FE3N cam in.