MONZTER

OK so I made a really bad video of my car tonight. its dark and you can’t see much, but you can hear how it sounds I rev it like an idiot and drive like a fool. I know, I know, I usually save it for the track. It was some low traffic areas. You can kinda see the tach and that it doesn’t have much problem going past 6500 to the redline of 7700, but our West Coast tachs may be optimistically calibrated to read higher than it actually is by at least 30% HAHAH just kidding:icon12: Enjoy MonZter

I am going to set up a in car video and post it tonight so you guys can hear it (if it does not rain)

I am not sure about the thermocouple wire, there were cables everywhere from the sound equiptment. The hood was open during the runs. I believe the plot said SAE correction factor Never drag my car, just autocross

I dont have a scanner so I took a picture of the new plot

The first Dyno was on a Dynojet and this last one was on a Dynopack. it was done at Church Auto in Longbeach

Hi Guys, Yep, I dont know if they are correct or not, like I said, just what I have got from my 2 dyno sessions. Why would I assume that my engine is making that kind of power? Good question, as I am not some pro builder, nor claim to be. The only thing I can think is that my idea that less can be more may hold true. Just the right size ports, cam, compression and good fuel injection, just might be luck, or maybe its all crap. Dont know. Dont some of the Rebellow Strokers make 300hp on webbers? if so is 70 less hp possible?

This is the inside of the intake and some pics of the welded N-42, and the build

Hi Jon, No I don’t take any of this personal. There is always room to question such discussions, I enjoy it When I first built the engine I Dynoed it to have it roughed in. And then spent time breaking it in and then lots of street tuning. at that time it made 210 at the wheels. There have been changes to the intake and exhaust since then. Here is the Dyno plot from then. This time it was a different Dyno, different operator. You could be right that its wrong, but this is just what I got from them. One at 210 when first built and not fully tuned and 231.5 now. I personally do not know if this Dyno stuff is legit or not, and actually I don’t care if my car made less, I just know it runs pretty good for what it is Good discussion

The cam is the 270/280 stage 3. I feel many people overcam our nissan engines and bleed off too much dynamic compression. Dynamic compression is what I feel is the trick to getting a pump gas friendly moter with higher compression (along with quench) to have a nice linear power curve. Compression sounds about correct. 1mm over sized with flat tops sticking out .015, 1mm head gasket. maybe a touch more CR than that No CFD on the current intake, just some guess work. It has a bad zone about 3000 that I have to lean out and retard the timing a bit (less fuel burns quicker)

sick

Yep, thats it. Don't want any steam pockets in the head with the higher compression and pump gas max power was at 7000 and still going. I have the rev limiter set to 8000. Because it was on their dime they did not want to blow anything up, so they shut it down at 7000. I think it had more. I will post the charts when we can upload pictures again.

Correct, the intake was cut up and the plenum enlarged, the runners externally welded and straightened, as well as the throttle body being relocated. Oh ya 6 bolt flanges so it will bolt to an early head here is it roughed out

A old friend of mine called me last week and said "Hey do you still mess with those old Z cars" I said "Yes, why do you ask" He goes on to tell me that he has a friend who works for some studio and does the sound clips for video games. Hey tells me that they are looking for a old straight 6 Z. I get the guys number, call him, and sure enough its true, he can’t tell me what studio, or what video game he is working on (secret stuff I guess) but after seeing a video of my car tells me he will pay me (yes pay me) $350.00 to hook my car up to a Dyno and record it. So I say OK. Today I met the guys doing the recording, it was really cool. They took a bunch of sound clips of various things about the car. For example, opening and closing the door, the hood, the hatch. Putting the keys in the ignition, and pulling up on the parking brake, ect. He even did a sound clip of the rally clock I have in there. When it was my turn, they hooked the car to the dyno and had microphones all over the engine and behind the car in various places. The operator / tuner took over and did some quick sound test / runs to check the car out. He said it was running lean over 4500, so proceeded to jump on my laptop and start tweaking my VE table for the Tec 3. He did a few more runs and got my AFR down a bit to 13.8 from about 14.5. They went on then to record the car starting, stopping, revving, and at a bunch of different RPM ranges. So when it was all done he handed me the dyno sheet. My car made 231.5 HP at the rear wheels and 195.9 lbft of torque. Not bad for a 240 engine running pump gas, I think. I will post the charts later as there is some issues with the site that won’t let me upload pictures. So my car is still NA (no I have not finished my turbo build yet) Stock 240 block 1mm over with factory flat top cat pistons, balanced and shot peened rods, balanced crank. Head is rather special as it is a N-42 with welded chambers to add quench and bring them down to 36cc with stainless swirl polished valves and my own port job (no idea what it flows) The cam is a MSA split duration. The intake is something custom I built out of a stock intake, and it is fuel injected with 320cc injectors all controlled by a Tec 3r. So the new score equals 231.5 HP at the wheels 195.9 torque free dyno tuning session My cars sound in a video game $350 bucks in my pocket not a bad way to spend a Sunday. Here are some pics of my car Thanks MONZTER

I ran the head again without the plenum, and it was 219 CFM at .5" lift 25" this was with a radius inlet on the intake port flange. At 28" it ran 136 CFM. I totally agree with you, except I think how you do it is not old fashioned. The computer stuff is just a tool I like to use to identify problems and spark ideas. It is by no means the end all be all. I believe it is simply a good first step in the process that includes flow bench testing and dyno time.

I just re-ran the intake and head last night with the new software. The flow came out to 200 CFM at .5 valve lift 25" I believe the 220 number was just the head alone and with the other software. I could run it just like you asked. any particular valve lift or special requirements. what type of velocity stack? just simulate a clay radius donut around the port?

Yes this is how the software works. I can apply a Mass flow to the inlet with a pressure outlet, or I can apply a depression to the outlet and see the CFM rating. Most of what I have been doing is to apply 25" on the outlet with a stagnation inlet. This is how I ran my plenum. I would apply 25" to each runner outlet and let the air flow. I tweaked the design until all ran very close to the same. After I got this dialed in I then ran it with 735 CFM on the inlet and measured the flow out of each runner. A while ago a talked to Kevin at accurate injection. He gave me some insight of what a ITB flows on his bench. I modeled it in the computer and then ran the simulation. I remember them being very close. When I run the plenum and port set-up above the computer says they are running about 220 cfm at 25"

Ya that make sence. This is what I did, the guide supports are only as wide as the guides, but smmoth out the front and back of the guide to make them more streamlined. You can see this in the Cad model in this view you can see how clean the flow around the guide boss is

here are some more pics, close up on the valve head area. click on the picture for the super huge view. I also uploaded some more video, but Youtube really destroys the quality:icon13: enjoy

Here is the link to the scan of the article http://www.savefile.com/files/1998523

Here is a really good article on heads, that I found very clear and to the point. Give it a read and I can look into making some more pictures to better explain what I am trying to acomplish. ( I cant get it to upload any ideas? its 12 mb .zip file)