Gulp!!! Got any new vids of her running down the street. Would love to hear a fly-bye at FULL TRUMPET!

 

This is definitely needed......

 

Haha, best movie ever! No I don't yet, I have just ticked up100kms. But I need to pull the manifold off for ceramic coating and a new gasket and also I will be fitting some better mounts.
So hopefully in a couple weeks I will be able to get some good footage for you guys!!

 

Congrats on it being up and running!! Sounds great! Its hard to beat a n/a 3 rotor in the sound department

 

you forgot to put this one up! started without the rear half of the exhaust but couldnt go for too long, our ears were just about bleeding with this little run:

 

Yeah I think there was damage to my memory from the sound waves!

 

Where's the drive by video?

 

It'll be a bit, need to put in some new engine mounts and put the proper intake gasket on. Then tune aswell, I'll get there!

 

Nice thread

 

glad to see that it's together and running now. you have accomplished something major and kinda even made it look easy. good stuff.

 

Well new xcessive mounts fitted. Now a small change I plan.
Due to me putting the throttle body in a place where the TPS didn't fit on the primary shaft (duh), I am running the TPS on the PPs.
I am going to mechanically drive it off the PPs, and have the LINK activate the side ports at higher RPMs.
(As per some advice on here)
I am currently working on a stepper motor with an inbuilt failsafe clutch. This way it will snap the throttles shut with any loss of electrical power.
The stepper is more difficult than I thought, but am
Learning slowly and should have a driver and program setup for it soon.
Oh, the motor unit is an old cruise control cable unit if anyone was wondering.

 

Quick update,
After driving it on the PPs only and then driving it on the primaries only, it is night and day for driveability and noise.

It's actually great driving around on the primaries only, very smooth and quiet (induction wise), relatively! Ha.

So next step is to tune this all the way to full throttle runs on primaries only and see where the power tapers off.
I will then look at getting the PPs to open up by that time at we will see what happens!

 

Bit more ear pleasure for you guys:

http://m.youtube.com/watch?feature=plcp&v=VcgYiNFP2P4

 

A friend having a quick drive, this is how it is on light throttle on the primaries only.
http://m.youtube.com/#/watch?feature...e_gdata_player

 

Power on the primaries should start tapering off above 4k "well at least on my intake design it does".

 

Is that a single primary side port only?

 

No. I designed my intake to use both the primary, secondary, & full pp. I left the others closed at the time just to see what the primaries would do all by themselves. I will say this, you should have a higher power range with your primaries because your runners are much shorter than mine.

 

Do you have the cad plot of the header flange to the engine you can e-mail? I need to get a flange cut for Tuesday and am in the UK!!!

 

Sorry Matt I don't. I used RacingBeats stainless steel ones and cut one in half.

 

Update?

 

thats a pretty neat intake setup, when are we going to see some dyno charts?

 

Well haven't I been the lazy one! Sorry I've left the updates so long. I ditched the crazy double throttle thing that I had originally built and threw on some simple 55mm ITBs. PP only at this stage. I was having issues with fitment and got the *****! Ha. I just wanted to drive the bloody thing and have some fun. So tonight I hit the dyno for the first time. 44mm PPs only, 55mm ITBs. Firstly I'm very glad the engine ran very well and nothing exploded! Secondly this is my first time tuning anything, so I'm glad I didn't destroy it.
However, it isn't making much power yet. The full throttle runs only resulted in 275whp, which is very low I know. The question is why? I will need to work that part out. A few clues, the power tapered off at around 7-7500rpm, just flatlined. Also the engine did not respond to any timing increase. I started at 22deg adv and tried all the way to 28deg, power went down at every increase. I also tried leaner and richer, it preferred around high 12s, low 13s AFRs.
So I'm thinking the exhaust is no good, or it's a big mismatch between it and the intake. The plan is to open up the side ports as well with extra throttle bodies, (like defined auto works) but not until I find out why this is not up to power yet.
Anyways, if anyone has some suggestions, I'm all ears! And for your viewing pleasure, I present this. Enjoy.

 

So as I said, yes it's low, but here is the dyno sheet. Open to any suggestions as to why it tapers so flat and of course low. I wasn't expecting crazy numbers on the PP only, but I think it should be higher than this.

 

What you explain sounds indeed like a restriction in the exh side. either the header, muffler or port, or a combination. what exh port timing/area do you run? power seems about right for a 13B PP with 44mm ports, rather low for a 20B

 

The exhaust is 2inch headers, (you can see pics earlier in the thread), long length ( I can't recall exactly but I think it was based on the RB suggested length 104inch?), they merge into a 3 1/2inch straight through muffler, it has a 90deg bend that then splits into two X 3 inch pipes which go into a twin 3inch straight through muffler.

It's not perfect, but that's the best I could squeeze under there and didn't think it would take that much power out.

The exhaust port is ported from the Extreme Rotaries template. The inserts were modified to match the port shape and expand to match the 2inch headers.

Would a restrictive exhaust explain the motor not responding to timing advance?