Dom_C

went to the dyno today. I am a bit disapointed. My car pulled 154.2 hp at 7600rpm. My mods are, recent Kevin Landers rebuild with s5 internals, and a street port. The port was a 6 port to 4 port conversion, of medium size as far as i know. I also have a RB collected header, to a custom headerback, catless. I have S5 upper intake mani bolted to my s4 lower, throttle body mod, HKS mushroom filter. Stock ecu, NO safc or anything. I'm trying to scan the graph but my scanner isn't working i will try to scan it again tomorrow. I feel like for the mods that i have my car is weak. . I also fel like this dyno is a bit sketchy. My first runn of the day read 120ish hp, the second run read like 134, and the third and finalrun read 154. . i don't understand what was up with the dyno. . . very odd. I feel like i should be making alot more power than 154. Also i am making 125.7 for TQ and the curve is pretty flat. Anyhow what do you guys think, i live in maine and this is the onyl dyno i know about in maine so i don't ahve the option of going to another dyno to check. Any input would be great. thanks. Oh also my Thermo Sensor on the back of the waterpump was disconnected due to a broken clip. .would this cause the ecu to go into a closed loop mode, and make me loose power? Thanks
Dom

BDoty311

What kind of dyno? Dynojet? Mustang?

Kahren

iTrader: (13)

if the car is cold it will runa more conservative map, so that is why yoru power seems low to you. also a streeet port on an otherwise stock doesnt gain very much power at all. by stock i mean simple bolt ons such as exahust and some sort of an aftermarket intake system. you are maybe down 20 hp. get the sensor fixed and hit the dyno again. do you have the af chart? is your timing zeroed in, what octane are you using? does the vdi work? are the 6 ports functional?

Dom_C

I didn't get it widebanded because i didn't have the temp senor hooked up i should have though. I'm not sur eon the timing though i havn't checked it sense the rebuild Kevin put the crank angle sensor back in while it was there. I will do the timing and then also hook up the thermo sensor, should i advance the timing at all? I am using 87 octane, the VDI is functional and i removed the 6port system. What else do i have to do to make some real power out of my N/A. i will go megasquirt when funds permit and that will hopfully help alot, then hopfully some sort of custom intake mani. thanks. more input would be great!
Dom

Dom_C

Oh it's a land sea dyno

ddub

What's your full mods list?

noman17

maybe the dyno was fishy or you hooked up the wrong cable on the ignition pickup? and the dyno couldnt really read

RETed

I think that's about right.
I think the DynoJet reads the highest out of all the dynos out there.
154 is a pretty respectable numbers considering it's running probably rich.


-Ted

pengarufoo

you say the curve is pretty flat, where does it start falling off?

124 lbs-ft at 8000 rpm is 190hp which you would be happy with I imagine.

at 9000 it's 190


6 port to 4 port conversion? with an NA intake manifold setup, what is this all about? Does it mean the secondaries and aux ports have been merged into one big port? Is the manifold all matched to the engine setup? If it's just turbo 4 port end plates has the manifold been modified to match it?

If the end plate ports are now monster ports this thing probably should be peaking at pretty high rpm if setup properly. Were the primaries ported?

Also with thermosensor disconnected it was probably not fueling properly, the ecu will have to assume temp to a default value and it may not be close to what is actually happening... get that fixed and get a safc or something else so you can tune it, and next time have them monitor the AFR with the wideband.

rotarygod

iTrader: (1)

His engine has the secondary and auxillary ports in the end plates completely hogged out into one giant port. I'm a fan of not doing it this way on a street car since it isn't any more powerul than a much smaller setup. This is especially true with stock intake manifolds and stock or stock/piggybacked ecu's. Of course some people get pissy with me about this since theirs are done like this. This result is very good proof that they don't work like the "should". Dom this isn't a personal attack against you or your car in any way. I just don't like "shops" that tell people this is how to do it on a street car without any proof or even verification of theory behind it. Race cars and their setups are totally different and this port can in fact be made to work very well under the right circumstances. In order to get the most out of your engine, you will need to completely dump the factory ecu. If you have an air flow meter, you are losing lots of power. Period. You will also need an intake manifold that can flow what the new setup can. Once you get these taken care of, you'll see some much better numbers.

Dom_C

yea I see what you are saying. I plan on going megasquirt someitme in the near future, and also am working with a friend on creating a custom intake manifold. And yes rotorygod is correct, the runners in the endplates and manifolds are still intact, but the ports are just dug out into one large port. any more info would be great. thanks
Dom

Dom_C

Here is the dyno graph, you can see where i opened the VDI. I have the VDI hooked to a air pump which is hooked to a toggle. I had them open it at like 5500 rpm the first run, they do fucked up work there or soemthing cause the first run only yeilded like 120hp. it was weird. and the second run was only at 135, and this graph is the third run.

Dom_C

Also, another thing i learned is that the stock fuel cut on my car is at 8500rpm. The stock tack reads like 7800 when the fuel cuts but the dyno tack is at 8500. ******* crazy. . lol Anyhow, they didn't put that part of the graph on the sheet i guess cause it wasn't making power up tehre maybe? but yea what do ya think?

ddub

Full list of mods?

Dom_C

did you read the first post? I have a fresh Kevin Landers rebuild and port, the nature of the porting is a 6port to 4port conversion, S5 rotors, I have a RB collected header, custom 2.5 inch headerback, (Y pipe), no cats. I have S5 upper intake mani mated to my s4 lower, and an HKS mushroom filter, i have an electric fan, no p/s no a/c, unorthedox racing underdrive main pully, all emisions removed. I NEED STANDALONE!!!! that's about it

ddub

That's more than you said in the first post which is why I was trying to confirm, and yes I read it thanks.

pengarufoo

Have the primary ports been ported?

And what about the exhaust ports?

If all your intake porting is on the end plates, making the two ports one huge one, and you are using an unmodified S4 LIM... I've got news for you, the secondary runners on the stock unmodified LIM flow pretty damn poorly, and those are the ones you're trying to make power with.

Does your LIM still have it's aux port actuator rods? Do your aux ports have the aux port sleeves? Are the sleeves stock?

Can we get some photos of the ports and supporting mods to the intake and exhaust?

speedieFC

As far as i know all he did was clean up the exhaust ports. He cut out the diffusers and cleaned it up a bit. The primary's were left untouched i beleive for idle purposes he said. Yes the s4 LIM is unmodifiend for the most part, well i did port match the s5 upper to the s4 lower and that's about it. I have completly removed the 6pi system. no rods, no sleeves, no actuators. I can't get photos of the ports because i don't beleive tht Kevin took any when he was porting it. .when i eventually tear the motor down i will post pictures of it. For supporting mods i've already listed my full mod list. . What do you guys suggest i do to make more power? thanks
Dom

Dom_C

sorry about the above post. SpeedieFC was using my comp last and forgot to log off. . i typed that under his name, didn't notice. . but yea that post is from me. . sorry about that guys

ddub

I have the same port, here's what it looks like basically. This pic was taken when I was in the process of the port and hadn't finished or cleaned it up yet.

Kahren

iTrader: (13)

that port will not work well, if anything u want to do it the other way around, where you port the runner wall into one, but keep 2 ports at the plate and 90 degrees into the runner where the flow will get split. if Dom_C is running the same port i am nto surprised it dynoed so little.

ddub

Then how do you account for the fact you did something very similar?




Is it because yours is bridged? Is it because you removed the divider in the runners too? Is it because you have a custom manifold setup? All of these?

I'm just trying to get an understanding for why that is so bad and yet you did something similar.

Kahren

iTrader: (13)

there is no 2 runners inside the wall, its ported one large one, i also have never finished puttign that motor together partly as lack of interest and enthusiasm and partly that i dont have time to play with that, i might come back to that project and finish it later.

Kahren

iTrader: (13)

also i was never planning on running that with a stock manifold or at a stock redline, that would have to be revved to 10k to take advantage of all that port area. also at the time it seemed like a good idea porting it into 1 big port since aux and sec ports with bridges on them didnt look all that good, after i ported into one and actualyl saw all that space there i started to realize that it might be too big.

you generally dont want to increase port area as you get closer toward the engine, u want to start out big and go to small, large throttle body smaller runners, its best to be takeper all the way down. that port would be backwards, on my port is about same size all throughout only slightly increasing at the port. i did this to see if just with sheer volume and ridiculous port if it will make power. once agian i have never finished even porting that as i saw no real gains, and just the amount of porting is not even worth whatever extra gains there might be

when you knifeedge the wall at the port you are only slightly changing the size of it, when you hog out the runner like that the flow gets changed dramatically, it just doesnt flow well. though this might be great with boost and a LARGE turbo.

ddub

I just want to know why exactly combining the ports is so bad? It's perfectly acceptable for people to knife edge the divider making it as thin as possible, but once you combine them this is wrong? Why? I'm just trying to understand the reasoning for this.