My Major Project PrtII - Single turbo Conversion

[mx1311]

That does look interesting .. Expensive by comparisoin to an HKS unit though?

I think my leads are uprated.. I am not 100% sure though. They are red and a lot thicker than the ones on my spare motor which definately look stock!

Cheers
Lee

dude, that shiz, if you could find it, retails for well over £1200 new

[leeroy_25]

HKS Cheap!?

Not that I normally buy somehting because the make but I have never thought of HKS as cheap!

[leeroy_25]

How much!!!

[mx1311]

the twinpower imho is a very bottom end ign system in regards to mdi, crane etc etc

[BlitzBoy]

Good effort on the conversion on a budget Leeroy, impressed with the effort.
You will probably benefit from getting some brand new stock coils or decnt aftermarket stuff, as a lot of the original FD ignition stuff is starting to break up due to age and heat cycles. You probably gain like 60hp when sorted.

But 370 fly is still nothing to be sniffed at 115bhp up on stock, well done on the build.

[leeroy_25]

RIP
http://www.mazdarotaryclub.com/forums/showthread.php?t=62784

The news we all dread!

[leeroy_25]

We are all back and run in!

Dyno\'d on Saturday and comfortably made 306bhp at the hubs at 0.8.bar.. No ignition breakup at all. Tried to add a bit of boost but the controller is unstable for some reason so we had to give up on that until I can figure out what is wrong with it or get another.. Once I can get that sorted I should hopefully get up to 320whp. The I expect I will be lacking in ignition to go any further. We will see!

Lee

If you are intersted I am just starting a website at //www.rspowerprojects.co.uk

As yet I don\'t have signature permission to add it too!

[DSNorth]

Just a quick thanks for a good read.

Shame I cant weld for the life of me

[CharlieP]

Hi- I did look for info in your thread quickly, but couldnt see much. Have you thought about doing your own v-mount with the std rad!?
I did, probably cost me about £250, inc second hand intercooler, pipes etc.
Much better intake temperatures, and water is the same.
Not that hard to do, and surely a must on a single turbo set-up!?

[leeroy_25]

Thank you DS North. Glad you enjoyed the read.

Charlie I haven\'t thought too much about a v-mount. It crossed my mind that I could probably fabricate something but I don\'t appear to have any issues with intake temp or the car getting even remotely hot.. I guess the bonnet helps quite a bit?
Maybe i\'ll look into that for the future. thaks for the heads-up.

Lee

[leeroy_25]

Okay guy\'s I think this will be the final update to this project. I have been wanting to put a little more bost into the old girl since the rebuild to get up to about 1 bar and see if I could top 400bhp (flywheel). I had problems with my electronic boost controller so decided to make my own mechanical one based on a dawes device but using a little bit more finesse than the ones you can get off ebay that don\'t seal properly and most people complain boost spike. So I set the unit up last night and fitted it to my car for tuning with Geff today. After putting a new pair of Leading plugs in (Done a set in 1000miles!) due to ingnition breaking up I must say the results were very pleasing. I think the graphs say it all.
Wheel power and Boost


Boost and AFR


Estimated Flywheel power and Torque


I must say I was stoked with the results.. My aim was to top 400bhp on a budget so over 420bhp is very pleasing indeed. The hard graph paid off!

As you can see the boost curve is very nice and smooth. I have not road tested the device much being that it was only fitted last night so I will see if the performance lasts and may offer the for sale in the near future.

I would be interested to get some feedback on the AFR graph as I have some rich running problem down low and Geff tried to iron these out but it appears a small group of cells on the datalogit are causing no effect on the output for the ECU. If you try and turn the fuel down nothing happens until you litterally switch the injectors right off? Maybe this is a problem I have to live with for running 850cc injectors all around although Geff does not recall having such an issue before. Anyway thoughts Please or any additional info would be appreciated.

Visit www.rspowerprojects.co.uk for more of my projects and info.

[turbotoaster]

where on the map do you have this issue, if its within the first 5x5 then i have that issue, only thing that got those areas lean was inj lag, but if im just touching the throttle under 2krpm(ie deep into vac) it goes super rich(11s) and no amount of tuning  helps with that.

Do you have a wideband?

[leeroy_25]

Hi There,From memory is was about 5 rows down and the last 4 of the 5 cells in I think, if that makes sense? I am not really too familiar with the tunning side of it to be honest.
Are you running 850\'s all around too? I do get exaclty as you say.. Cruising at 2k or less it runs rough and you can here it is rich as sin! I will ask Geff if he did anything with injector lag.

I presume the AFR of say 11 is 11 air to 1 fuel? so the lower the number the richer it is? Looking at my graph below I have got around 11 for most of the map above 4500rpm? And below that way higher which makes me think AFR is not measured how I have assumed above?!
If you are saying that 11 is rich then I guess I have too much fuel all together? Can someone clarify what a good AFR is? I was led to believe around 11 was okay?

Cheers
Lee

[leeroy_25]

No on the wideband by the way!

[turbotoaster]

yes im running 850cc all around aswell, the issue we both speak of is that the pfc cant drop any injector below a certain millisecond of time between opening and closing, and because of that the injector cant be turned down enough at that low rpm to get decent afrs.

Because i have a wideband something ive tested is cruise at 2krpm in 4 or 5th...ie so its super rich and look at your inj duty on your pfc, then press the accelerator, only a bit, so you go from say 18in of vac to 13inch of vac and you will notice the inj duty will hardly move....but because the engine is now sucking in more air but not fuel the afrs go back to where they should be (14s-15s)

Yes the lower the number, the richer it is, you have it spot on.

Your afrs on your graph are spot on, thats how i would want my map, generally the more boost you run the richer the fueling, notice how the afr follows the boost, thats perfect.

you pretty much want these sort of figures.

full boost 11afr
building boost high 12s to low 12s
idle 14....very hard to get with 850s, im at 13.5 at the moment.
cruise at low rpm 14s
cruise at motorway speed 15-16

any more questions im happy to help