fj1200 turbo "thug"

[backstreetheros]

At this moment in time its all hanging off the studs but as you can see the bike is in the shed. The welder isn't so I'm trying to avoid putting my back out... Again.... Trying to.get it in and out lol.
There will be a solid bracket from the nearside to support the rest of the exhaust
I'm planning on welding the seat, exhaust bracket, intercooler bracket and fuel pump bracket at once to save effort.
The bike is slightly weighted to the right so intercooler and whatever other crap I can find I'll balance on the left side!
Have to modify the spring in my dump valve and fit that too.
I'm starting the bike off on extremely low boosts and working up.
I think one of those programmable ignitions may make sence.
Was also thinking water/methanol injection to kick in at higher boost.
Need a waters/methanol resivour then! Running out of places to fit it on a bike.

How much will the standard boost advance actually change the ignition? Surely this would help before I have bought the programmable box?.

I still have the fuel pressure regulator, carbs and ignitor to get yet.
And a boost advance thing.
That's what I need to make it run,
To make it ride... Different matter.

[Pat Conlon]

Mark, let me see if I can shed some light.
The stock FJ ignition "power boost" feature is not what you need, so don't confuse it with anything due to forced induction.
Apples and watermelons.
The stock FJ has a ignition which runs ~35 degrees advance (BTDC) starting ~ 4k rpm and above. The power boost feature senses higher vacuum levels when the throttle plates close and then advances the ignition to ~40 to 50 degrees to flash off excess fuel in the intake mix.
According to Randy @ RPM this is a emissions control feature.
As I painfully learned, racers don't use this "power boost" module, they just disconnect it and plug the vacuum port and run the stock ignition advance.
Here's a thread on this subject: http://www.fjowners.com/index.php?topic=6739.0
Look at the different timing maps. Look at the vacuum levels.
Remember that the vacuum signal is taken between the plates and the engine, so when the throttle plates close the vacuum goes up.
The "power boost" feature is of no use to you. It's a emissions thingy.

Cheers lad.

[backstreetheros]

thank you!!
I finally understand now!
Surely this is in essence like anti-lag. But without adding more fuel.
I'm glad you explained it before I went and bought one.
This wouldnt do anything on my bike.
So back to just the ignitor then.

I need to find an ignition key off something so people can't steal it as easily.
Still lacking in information regarding high pressure tappings on the block to feed the turbo.
Can anyone shed any light?
Thanks again for everyone's help so far in teaching me the fj-way!

[dixiethedog]

Hi Mark,ive been onto my friend about carbs,and he's undecided about selling them. He's built a new chop,which is being finished this week,running a single weber 45 carb. I think he wants to make sure the engine runs ok with this,as he's doing his first run on the bike from the north east of england down to Bedfordshire! brave man.
Check this link out to see somebodies Turbo'd FJ.
http://www.oldskoolperformance.com/forum/viewtopic.php?f=6&t=723

The builder seems like a nice bloke,offering good advice to people on forums,so he might be worth checking out.
Im very much like you,in that no cash seems to change hands on builds,more favours for favours or swopping of parts. If id known about this a week or two ago,i would have sent you an unwanted turbo intercooler. Too late now though,as its been taken by a friend.

[Travis398]

racers don't use this "power boost" module, they just disconnect it and plug the vacuum port and run the stock ignition advance.

They do use it, and they hook it up just like the bike.

[Travis398]

its drz400 front end

what part?
I see your forks are FJ forks

[racerrad8]

We don't use it in our Legend cars.

Randy - RPM

[Travis398]

Define we? 600 says this.....don't they?

[racerrad8]

That is the wiring diagram they issued back in 1996...but in 98 they had to change over to the XJR black box as that what Yamaha started supplying them with.

If you look at the timing charts, the "vac sensor" as they have labeled it, causes the ignition timing to spike at high vacuum (closed throttle). We found that the car would actually accelerate when the timing jumped at the point when the throttle was released. (not what you want when trying to slow for a corner)

So, back in 96 when I won 23 of the 24 races I ran in I removed the sensor, added the base timing and that is what we have been doing ever since.

If you look at the timing curve on the chart below, it shows the timing at 37* at 9000 rpms, but when vacuum is supplied to the "boost" sensor the timing jumps to 50*. This is done to burn the excess fuel in the cylinders when the throttle plates are slammed shut on decel.



Today USLCI (600 Racing) says you have to use their "red box" since it is better than the O.E. parts and they surely will not give you any assistance with the black box parts.

Randy - RPM

[Travis398]

That is the wiring diagram they issued back in 1996...but in 98 they had to change over to the XJR black box
Randy - RPM

I assumed we were talking about 91 FJ ignition here. I don't dispute anything you are saying.......But.... the reality is people are still using them (91 FJ ignition)  and they are still using the boost sensor.  I doubt any of them have ever won 23 out of 24 races though.

[backstreetheros]

Cheers for putting up the wiring diagram, i have to wire it up next week as my ognitor hasn't arrived yet.
Bought a set of carbs on ebay so hopefully ill get it to fire before I connect the plenum.
I'm not going to bother witg the boost sensor as frankly I don't want it boosting on shutdown and throttling into corners. I'll try get a video of first fire.

[fj11.5]

Thanks too you blokes, i think i now know why my fj has been speeding up when throttle is closed , i thought it was carb
,but seems its timing, i had done the 5 deg ignition advance mod, but also fitted an aftermarket cdi, with no vacume advance,  so set timing to standard,  see if thats fixed it,    sorry to hack your thread  but wanted to say thanks  , , bring on the turbo chopp vid 

[backstreetheros]

Please help!!!
I wired the bike to the above diagram
Does it matter that i have a 3xw motor, pickup and coils
But i have a 3cv ignitor!
When I attatched the live for coils and ignitor it shorter out, now is dead as a doornail.
No spark atall.
Everything else is wired as per diagram but I do have a spare wire from timing pickup. Orange?
Have i just fried my new ignitor??
Im gutted!

[JMR]

That is the wiring diagram they issued back in 1996...but in 98 they had to change over to the XJR black box as that what Yamaha started supplying them with.

If you look at the timing charts, the "vac sensor" as they have labeled it, causes the ignition timing to spike at high vacuum (closed throttle). We found that the car would actually accelerate when the timing jumped at the point when the throttle was released. (not what you want when trying to slow for a corner)

So, back in 96 when I won 23 of the 24 races I ran in I removed the sensor, added the base timing and that is what we have been doing ever since.

If you look at the timing curve on the chart below, it shows the timing at 37* at 9000 rpms, but when vacuum is supplied to the "boost" sensor the timing jumps to 50*. This is done to burn the excess fuel in the cylinders when the throttle plates are slammed shut on decel.



Today USLCI (600 Racing) says you have to use their "red box" since it is better than the O.E. parts and they surely will not give you any assistance with the black box parts.

Randy - RPM

Well that stinks.

[backstreetheros]

on the upside i got my carbs, throttle and cables through!
i was like a cheshire cat opening my post!!

today i've got my million jubilee clips to hold it together!



the old mitsubishi shogun intercooler pipes got ditched for some samco hoses that came on my intercooler, but the intercooler is way too big for the bike so not going to run one for a minute.



will have to get on and do some more work on it but been chaotic with work!
good for business, bad for chopper building