Reply With Quotevery good!
feel free to play with mine anytime you wanthaha
Yes it is and I must say I'm loving it, I really like it. Once Tim puts up the torque curves of the different lengths, look at where the dip is, at first I said to Tim that I believed the dip was caused by the quads, then after seeing the standard curve which is nice and flat I was sure. Then after trying different tube lengths change where the dip is, obviously an intake resonance problem.
I reckon there is still more in this engine and to be totally honest we actually haven't spent that much time on it, huge gains changing cam position(vvt), you must hear this thing on the dyno in real life, at about 6500rpm it gets this incredible intake shrill to it, I'm sure Tim can elaborate more but as we have been tuning it, it's been getting angrier and angrier.
If you look at his first power run before we had a look at it, basically where it climbed out of the dip it really only had a 2000rpm wide band, my initial aims were 125kw and to extend the power above the dip another 1000rpm, well we have exceeded the kw figure and not only did we extend the rpm about 1000rpm higher but also about a 1000rpm lower.
I really like this engine, foe an NA 2 ltr it really delivers, I have dynoed a number of F20C S2000's and they too deliver awesome kw for an NA BUT at 9000rpm, where as this engine just cranks the torque. Tim is coming in early this week to give us plenty of time to clean up the map, so I'm hoping for more mid range torque.
Just for the interest of readers when we initially were messing with the vvt, I was picking a certain load point and just getting a feel for how much extra/less torque we'd get as we changed cam timing, some of the gains were MASSIVE, there was smiles all round.
Great engine.
Hachiroku since 1994
Originally Posted by LittleRedSpirit
very good!
feel free to play with mine anytime you want
got any links dave?
the graph will be up on the blog on sunday
the induction sound has changed so much! used to be nice, smooth and deep. now its just angry and LOUD! soo soo good!!!
JJ
"my mind demands side pipes out of hear, now to command my hands to make them"
JJ
"my mind demands side pipes out of hear, now to command my hands to make them"
interesting... i thought for sure you'd get better gains with the 100mm
you need to look at the torque and also were you moving inlet back at all .rule of thumb 380mm from back of valve is what you are after .also it also depends on what extractors you are using as well
on vvti as the power starts to drop off ,retard 500 rpm before by a couple of degress as inlet moves 5 to 255 lifter rise . and i use exhaust to move the reversion around
Clay I have a feeling the motor wants 100, but the bend and the poor bell on the stock stacks have stopped it flowing enough air over 6k
JJ
"my mind demands side pipes out of hear, now to command my hands to make them"
Glen we dident have the time to play with vvti with each set of stacks.
The motor is getting a good tune on wed so I will try retarding the inlet after 5500 then
JJ
"my mind demands side pipes out of hear, now to command my hands to make them"
those ae111 ram tubes are the pits.try some different sizes and change in size every 20mm
They are the only sizes we had lying around
I would love to go more in depth but we are getting allot done considering it's a tafe course ha ha
JJ
"my mind demands side pipes out of hear, now to command my hands to make them"
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