Build Thread Enola- Finishing touches

[Sparky714]

I have been assisting one of the instructors who is out of town this week for training, the assistant training director was going to help me take the class on for the week. now i have just been informed that on day 1 he has meetings to attend today...

right out of the gate im thrown into the fire.


BRING IT

I was an instructor for five years at our local, and if I can do it , you definitely can. Don't sweat it.

 

[General karthief]

I was an instructor for five years at our local, and if I can do it , you definitely can. Don't sweat it.

He's just all 'whiney baby' this week.
His heater core spung a leak.

 

[a91what]

Today went well all things considered. I'm tired..... gonna drink.

 

[a91what]

Today I bypass the heater core.... so the car is driveable again for the alignment fix tomorrow morning.

 

[CarMichael Angelo]

And tommorrow.....

De MOON!

 

[a91what]

Not looking forward to pulling the dash to remove the hvac box... lol I hate these things.

 

[Mustang5L5]

Not looking forward to pulling the dash to remove the hvac box... lol I hate these things.

I need to do that too to replace my Evaporator before I add A/C back into the car. Not looking forward to that.

 

[General karthief]

Did mine years ago, have to do it on the 'stunt double', more on that later.
Still hate'n it

 

[a91what]

With the alignment set to the MM specs the car drives much better, it feels like the time and money i invested on the suspension setup was worth it. The car gives a feel of confidence when driving spiritedly and no longer wonders the road.

I posted an idea in mikes thread about redoing my throttle body linkage so that the secondary throttle body is progressive instead of directly tied to the primary. Basically i want to design it so that the second throttle body acts like a mechanical carb secondary.

Here is why... under low speed low throttle conditions the supercharger bypass valve is held open so the system does not put undo strain on the blower, this makes the entire system more efficient. In my system the bypass valve is vacuum actuated and pulls this vacuum source from the plenum behind the throttle bodies, this works well most of the time. However under low speed low load conditions (like leaving a stop light or casual driving in town) having both TB open at the same rate (both of them 65mm explorer making an effective 130mm opening) causes the vacuum in the plenum to go below 6" closing the bypass. This creates a spot in the throttle movement from 1%to 15% where the blower always creates boost spikes when the pedal is touched. On top of that the pumpshot enrichment must be set so high even at such low throttle conditions that sometimes the engine will cough causing the car to buck this in turn makes you stab the throttle and the bucking continues until the clutch is depressed. This to me is not safe, i must try something to rid myself of this issue.. The engine constantly going into boost and the high pumpshot enrichment are costing me precious MPG... right now the car gets around 11MPG.... i know i have a heavy foot sometimes (on ramps or any backroad really) but i think i can get it to 15 MPG or so if i can keep it out of boost.

The basic idea is to make the secondary TB linkage arm shorter (as simple as drilling a new hole to put the bolt in for the linkage) then i will take a fresh piece of aluminum flat bar and make a linkage bar that is slightly longer and cut a slot in it for the secondary. As the primary opens the slot in the linkage bar will slide on the secondary until the primary reaches about 50% open then the secondary TB will open at a rate of 2:1 until WOT....


Am i crazy or does this idea have any merit??

 

[Noobz347]

I still don't honestly see a benefit to having multiple throttle bodies. It's the likely source of low speed drivability weirdness.

 

[a91what]

I still don't honestly see a benefit to having multiple throttle bodies. It's the likely source of low speed drivability weirdness.

yes it is, that is the purpose of doing the mod described so that only one TB functions under normal driving conditions. both are needed at WOT to reduce the restriction to the blower..... also it looks cool duh

 

[Noobz347]

Remind me, how many air meters are there in this system?

 

[hoopty5.0]

If it were me, I'd have a sliding loop on the 2nd TB cable so that it doesn't open until the 1st TB is x% open... Then it would function like a "secondary". Seems like it would be really easy to fab up as well.

 

[CarMichael Angelo]

Remind me, how many air meters are there in this system?

Zero. It's speed density.

Unless you count thE MAP sensor as an " air meter"

 

[Noobz347]

So then, you need two different size, nautilus shaped, TB linkages and whatever cable or connecting rod to go between.

Each opens as the function of a ratio so that when one is WOT, both are at WOT.

 

[a91what]

I currently have this.

if I'm not mistaken shortening the linkage arm on the second TB will reduce the necessary throw to open it correct?

 

[General karthief]

I like the 'sliding linkage' idea, like a progressive linkage on a tri power setup

 

[90sickfox]

Sounds like it'll work, Steve

 

[a91what]

Yeah I'll get around to trying it eventually... right now I'm at breakfast a short stop on the way to the river... kayak weekend

 

[Mustang5L5]

You could have that second linkage push a cam that gets progressive the more it moves. Only way I can think of that would allow little movement off idle, but then ramp quickly to WOT.

Of course doing it so it looks visually appealing is another story.