Big boost turbo's

[panel]

Garrick , can we see a before and after pic of said pipe removal ?

[GARRICK.CLARK1]

I'll see what I can do. The after shot is more possible, the before pipework is already removed. ACTUALLY i have that shot on me phone.
The way I see it, loads of pipe length from turbo to a carb that relies on the boost for the fuel enrichment signal is a bad thing, there isn't a good signal ,its a laggy signal that only works at higher revs.
I'm gunna have 4 x short 90 bends and a bit of straight pipe. Possibly not enough straight to fit the silicone BOV pipe, so that might have to be welded into the cold side, that will work wont it.
Funny how an engine can look cool as on a pic, but quite often doesn't work in 1 way or another.
I have the turbo higher than before too. It was bolted to the merge on the header, now i have an up pipe off the merge to lift the turbo high so i can have a good oil drain, That up pipe has created a laggy turbo as the gas has slowed down before it hits the turbo exhaust inlet. Boost out of the carb to the heads is probably travelling a bit further distance than a standard engine. Its all 2 inch pipe. poss should be 1 3/4 instead.

[madmike]

Mine starts out at 2" then necks down to 1 3/4"

[Clonebug]

My exhaust isn’t optimized for turbo and neither is my intake but I cant say I have had lag issues due to the plumbing...

A turbo moves a LOT of air..... it don’t take much time to fill those pipes since there is always air moving in them.

[richie,uk]

Well this got way off topic then!!!!

[GARRICK.CLARK1]

Yes it has.

[GARRICK.CLARK1]

Been looking at the turbo gallery, a few motors on there look like they have fuel going up hill on there draw throughs, My blow through inlet manifold is horizontal to the heads, I suppose it would be better if there was a down ward angle to it, so fuel flows better to the heads, be easier to start to wouldn't it.

[panel]

Lets have a look at that engine shot Garrick. It might help us out with your questions. Plus I haven't seen one in the 7 pages of this build yet

Aren't you blowing through carbs ?

[GARRICK.CLARK1]

I've tried pics, there all bigger than 90/90
Panel ,I'll email you the old pipe work pic
Not got a new 90 degree pipe to finish the new pipe work yet, that might be today.

[GARRICK.CLARK1]

So after a few months off I've finally got her tuned.
I bolted the turbo back onto the header ,to remove the a lag inducing up pipe, Now the boost comes in early which pressurizes the carbs and the fuel pressure regulator at the right time.
It runs good, AFR is acceptable, power is there.
I had to fit a 50 idle jet in the feed pipe to the water injection controller, the 0.5 bar water start point wasn't in sync with the gauge. So after the jet install, the pump now works exactly when 0.5 shows on the boost gauge.

Thing is ,when I try to go to 1 bar ,the motor wont have it, it back fires,
what's the cause of that.
Does spark really blow out or is it a myth. Yes my ignition is STILL standard.

[Coyotemutt]

As air density increases, the electrical resistance of the air also increases (as I understand it). So it doesnt blow the spark out but it makes jumping the gap more difficult.

[Chip Birks]

So after a few months off I've finally got her tuned.
I bolted the turbo back onto the header ,to remove the a lag inducing up pipe, Now the boost comes in early which pressurizes the carbs and the fuel pressure regulator at the right time.
It runs good, AFR is acceptable, power is there.
I had to fit a 50 idle jet in the feed pipe to the water injection controller, the 0.5 bar water start point wasn't in sync with the gauge. So after the jet install, the pump now works exactly when 0.5 shows on the boost gauge.

Thing is ,when I try to go to 1 bar ,the motor wont have it, it back fires,
what's the cause of that.
Does spark really blow out or is it a myth. Yes my ignition is STILL standard.

I have definitely seen misfires when plug gaps were too big and boost too high. Lower the gap it will probably help. What is the gap now?

[GARRICK.CLARK1]

Well to be fair chip , I've just checked them and they were 28 thou, now there 20 .
I could boost the ignition with a cdi ,but the risk is paying the money and it still does it. That tiny standard spark cant be helping though can it.
The big boost is available to me , I tested it very briefly with a bleed valve. The gauge needle raps right round.

[madmike]

better ignition is worth it, I felt the difference right away
last year I removed the MSD $hit(box tookashit)and installed just a single point mallory dizzy and a good ol' blue coil and
I forgot to close the 'Gap's and man was I chasing my tail trying to find out it was just blowing out the spark
as soon as boost started it feel on it's face!!! closed the gap boost was BACK,, then decided I need better spark , old mallory box ,slapped the MSD dizzy in and a big mallory box coil and Bang it ,now it has better 'git-up-& go'

[GARRICK.CLARK1]

So what was the symptom of the spark blow out. What did your motor do back there.
As I say 0.5 I can flat pedal it ,no back firing. up to 1 bar and it has a right paddy. no pinging. Should I knock the advance down a bit, they say more boost less timing, but that's to combat ping,
I must say , the plugs look a good colour, brown on the center electrode and earth strap.
I could possibly and will probably have too up the main if I want to go from 0.5 to 1 bar wont I.
I uses A DVDA dissy.,its not cross firing in the cap is it ,as its only a standard ignition.