Help Me Tune the TT and get the most out of it...

DorianL said:
Funny thing happened to me today - I blew a fuse this morning. I did... not the TT.

RICK SAYS: LOL..... :lol:

The new belt on the supercharger + pulley that I ground back work beautifully. No more slipping that I can tell. Still, after having set the ignition + patched up a tiny vacuum leak, I thought the primaries were a but sluggish. So I decided to jet down from stock 80 to 79.

Gmbl - not good. It started surging annoyingly on cruise as I drove that evening to a Nightwish concert with my son :cool:

Anyway, that night, after the concert at 00:30 in my driveway I rejet it back to where it was... the logic being to undo what I did. It improved things a little. Grmbl. Must be a vacuum leak. Idle hot was not great. I reset the float level. (Man I love electric fuel pumps.) Idle is better but still not ideal.

Next morning as I leave for work... @#$%@#$ I have a very hard time getting the now cold @#$%@# engine to start and idle and it surges again. Plus I was reading low vacuum. Grmbl - I must have bumped a vacuum line off. I blow a GINORMOUS fuse (throat still sore from swearing.) and turn around, go home and search all over for a vacuum leak - nada!!!!! ROOOOOAAARRRRR!!!!!

RICK SAYS: Yap...been there, done that, a few times!


So I decided to remove the supercharger bonnet and as I do... I spot a tiny piece of debris on the air filter gasket. Hmmmmmm... MF!!! I look in the carb and there are little tiny bits of pro-flow air fliter that smoldered and dropped in there - same @#$%@# that burned my face. Sticky!!!!!

Sooooo, I pull out some carb cleaner + compressed air and blast out all the holes. A-HA! One of the holes seems to restrict the air blast. I worked on it a little more and: bingo! Awesome!!!! Better tan I remembered it. When I removed the bonnet to drop the fuel bowl and replace the jets, I must have knocked some tiny debris on an air bleed. Moral of the story: gotta look beyond the undoing what you did but rather what you might have done.

RICK SAYS: Murphy is alive and well !!!

I was surprised to see how much air the centrifugal was blowing in there at idle. Cinching down the carb bonnet significantly smoothed out the idle. What a pleasure to drive!

First things before I tune: go thoroughly through the carb.
Second: go through all the vacuum lines. (I am thinking of using mteal tubing for this? Plus adding a couple more dedicated ports rather than splitting the lines.)

RICK SAYS: Gets some stainless steel, should be easy to polish and will look.....Oh So Good !!!


Now for the nice story:
The morning ended quite nicely. I was late and stuck in traffic on the highway to work. And next to me I see a school bus full of kids with a wall of them against the windows giving me waves, devil signs and thumbs ups. I drop it in to N and rev a coupla times to 6000. Mmmmm. That blower bypass valve sounds awesome letting out the compressed air!!!! The drop into 1 and a mild stomp to melt some rubber for a couple of feet... You know the kind of peeling out where you have to make little corrections to the wheel but are moving too slowly to really spin out. :lol: :lol: :lol: The entire school bus goes wild. Poor bus driver he must appreciate me. Anyway I drove off to a bunch of waves and cheers. :cool: :cool: :cool:

RICK SAYS: Great story, wished I could have been there for the ride !!!


We ARE cool!

D

Maybe even a few kid converts over here in Europe!
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Yeah am in love the electric fuel pump, i have my relays underhood and iuse use an alligator clip to the battery and relay coil to turn it on so i can set my float level and fuel pressure.

Nice story, made some kid have a good at school lol :)
The stainless steel braided lines look really good but they are a real pita to put on, i had to use a drillbit on each of them for my build(if you do that, use compressed air into the tube before final assembly, not like i did so you end up with tons of debrits in the float bowl and plugged accellerator pump.
 
mathd said:
Yeah am in love the electric fuel pump, i have my relays underhood and iuse use an alligator clip to the battery and relay coil to turn it on so i can set my float level and fuel pressure.
Click to expand...

:cool: :cool: :cool: Scoundrel!
 
What do you guys think? No WOT... Mostly primaries.

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The plug is dryer than it looks at ring on threads.

Lean? Or all right for cruising and light throttle? I jetted down from 80/99 to 78/99

I know secondaries are way rich from the big cloud I see in rearview on stomp. Will probably bring that closer to stock 80. Possibly 84.
 
looks a bit too rich to me!, but it could be the ignitions too retarded at idle, Id try a bit more initial ignition advance (like 2-3 more at idle) and not let it advance total much or any more than you let it do now so as to increase low rpm cylinder heat just a bit, then re-post plug pictures, you might need to get a bit smaller secondary jets also, do changes only one at a time and keep detailed notes
 
Right-O. One change at the time. I'm at 78/99 plus medium on water/meth... I should go to the large water/meth nozzle.

But first... Add a couple of degrees initial.
 
Added a couple of degrees of initial and changed nothing else. Well, I raised idle speed from 600 to 800. 600 felt just a little annoyingly uneven. Jets are same as is everything else.

This is the same plug after a 15 mile commute to work. It idled a bit before I shut down. The threads look a bit cleaner. The insulator a bit darker - but maybe because I was in stop and go traffic + idled some.


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Will check plug again after a smooth ride home. Let's see if the porcelain cleans up after a 1500-2000 rpm cruise trip.

Tip in throttle response seems a bit better with the extra 2 degrees initial.
 
Id lean out the primary's jets one step next, so we can verify its ignition or the jetting were dealing with here, then check, your definitely either too retarded in the initial ignition advance or a bit too rich at idle, it could also be the secondary jets are way too rich but we can easily isolate and test for that.
 
Am not sure but those plug looks on the hot side for a boosted application(ground strap cleaned up close to the base).
What is your initial ignition advance set at(am not sure it look between spot on and not enough looking at the tip of the spark plug)? No O2 reading(aim for 13-15 a/F at idle)?
You can tune the idle for the highest vacuum reading(or rpm if no vacuum gauge is availalble) that usually get close enough.

Those plug where dirty/black alot(how old are they?), maby they will cleanup more with driving.
It look rich on overall.
 
It seems there is disagreement in our ranks - one says to lean other to rich.

Remember this was done at idle/cruise. So if I follow my tuning run down in the other thread - I'll call this rich and jet from 78 to 76 and see if tht cleans off the soot. Again, there are no secondaries here - in fact the last time I ran the secondaries it was boggy and a very big cloud of smoke came out of my tail (I'm wide open there, Indy.)

As for Initial I have at running 38 degrees from 0 - 3000 RPM above 3000 RPM it drops down to 36 degrees.

At boost it will remove 1 degree per PSI.

Again, I was in some stop-and-go traffic this morning. When I cruise home tonight, I'll see if the plugs clean up.

They are new. I put them in this weekend.

D
 
DorianL said:
It seems there is disagreement in our ranks - one says to lean other to rich.
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Nope
We are saying exactly the same thing. Grumpy say he'd lean it out(meaning its too rich) he also say its too rich at idle and i said its too rich on overall(so id also lean it out)
Also reading the mixture on old plug is almost nonsense. Make sure your plug are not too old.
Am using 8 heat range spark plug(R5672A-8/7173)its a little too cold for me. your not running stock r45ts?

DorianL said:
As for Initial I have at running 38 degrees from 0 - 3000 RPM above 3000 RPM it drops down to 36 degrees.
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38 degree initial? engine do not has problem starting/cranking? Am not sure but something sounds strange there.
 
mathd said:
Am not sure but those plug looks on the hot side for a boosted application(ground strap cleaned up close to the base).
What is your initial ignition advance set at(am not sure it look between spot on and not enough looking at the tip of the spark plug)? No O2 reading(aim for 13-15 a/F at idle)?
You can tune the idle for the highest vacuum reading(or rpm if no vacuum gauge is availalble) that usually get close enough.

Those plug where dirty/black alot(how old are they?), maby they will cleanup more with driving.
It look rich on overall.
Click to expand...



You can tune the idle for the highest vacuum reading
not all that useful on a centrifugally supercharged engine
 
DorianL said:
Again, there are no secondaries here - in fact the last time I ran the secondaries it was boggy and a very big cloud of smoke came out of my tail (I'm wide open there, Indy.)
D
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You're right, but I'm such a good person I wouldn't say a thing about your smoking tail ! :lol: :lol:
 
grumpyvette said:
mathd said:
Am not sure but those plug looks on the hot side for a boosted application(ground strap cleaned up close to the base).
What is your initial ignition advance set at(am not sure it look between spot on and not enough looking at the tip of the spark plug)? No O2 reading(aim for 13-15 a/F at idle)?
You can tune the idle for the highest vacuum reading(or rpm if no vacuum gauge is availalble) that usually get close enough.

Those plug where dirty/black alot(how old are they?), maby they will cleanup more with driving.
It look rich on overall.
Click to expand...



You can tune the idle for the highest vacuum reading
not all that useful on a centrifugally supercharged engine
Click to expand...
Hes not running boost at idle, he still has a vacuum reading under that carb. But yeah i get the point.
 
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After a cruise back home. Jets: 76/99

The compression I have is 8.2:1

The porcelain is tanning.

The base ring is thinning out.
 
Another ride on 76/99 jets. Idle cruising - little power valve.

Lean it out a tick more? 74/99 seems very small on primaries.

Same plug as above
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Another plug
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Not so so easy to see, but plugs are indeed taking on a more tannish brown hue.
 
generally you don,t want the secondary jets to be significantly larger than the primary jets on a square bore carb so at this point Id start leaning out the secondary jests a few steps and not touch the other factors
 
Jetted down to 76/84 + went lo largest nozzle on water meth.

At WOT (first time) it back fired through the carb... Might have been the rev limiter, but I don't think so... The big clouds of smoke are gone.

Plugs seem a little cleaner.

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