My 20v ITB installation

[Ian.G]

Well,

its been a while coming but a few of you were interested to see how my ITB installation was done.

Today I have ordered my new trumpets from T3 to replace what can only be described as *the mess* that was already bolted to them.

as they are right now



after removing the K&N filters you see this...



Look at the way those bell mouths have just been held in with high temp silicone seal !!! they are not even the right size for the 47mm inlets on the silvertop ITBS !!! and 2 of them are falling out. I can imagine that some of that silicone shit has been sucked into my engine which is not good !

Anyone want to hazard a guess as to which injectors these are - I am thinking they are std 4AGE blue top - which probably means they would struggle to provide enough fuel for my 'claimed' power output.

the trumpet plate

This is just a pure work of art LOL





Some nice accurate engineering and welding there

And the ITBs themselves.





Again - some bonding agent was holding the plate onto the bodies - but look at all the agent that is in the airflow !!! again my engine has probably been eating this stuff which is bad.

I'm not impressed by the dirty mess inside the ITBs - maybe its best to take the whole lot off and clean them up ?

These pictures also show you how the throttle linkage has been done.

Even one of my siamese cats laia admits they are are bodge job.



I now have to put all this *crap* back onto the car as the new trumpets wont be here for a week.

So - what do you guys think ? its pretty messy eh ?

[Squeejy]

Did it come from Japan like that or was it done in the UK before you got it?

To be honest its things like that I've seen which put me off buying a Japanese import at the moment, the Japanese might have a better climate to keep cars from rusting but it doesn't mean they don't have bodge jobs being done occasionally.

Its good to see that your sorting it out though and at least the rest of the car seems nice.

[Ian.G]

It was like that from Japan - I'm sure Alex wouldn't have done it that way before I bought it.

As a whole it works fine - its just that I guess I am a bit of a perfectionist when it comes to things like this. I'm sure it will all be ok.

I wouldn't be put off by Japanese imports. This is the ONLY aspect of the car which not quite right (or what I've found so far). I think providing you get the right people to find you the car you can get a good one.

Glen from the driftworks forum has brought in some absolutely amazing cars. He has great contacts over there. He quite often has work carried out on the cars in japan by reputable drift workshops - labour rates are cheaper than the UK and the workmanship is top notch. Take a look at the Silvia 180 that Glen has just got for himself.

I guess at the end of the day these cars are 20 years old - its going to be impossible to find a perfect one.

[ZaX]

beige injectors = standard 215cc/min injectors

btw i see white cat on your engine!!!

[Squeejy]

I've seen a couple of imported AE86 imports with a cat fitted but I didn't realise it was [u:be6fb85ef2]that[/u:be6fb85ef2] type of cat, I don't think a decat pipe will solve the problem.

[Ian.G]

Zax,

do you have any idea what 'potential' power those injectors run to without going over 85/90% duty ? Looks like I'll need to find myself some bigger ones. Car was said to have 20v injectors - but I guess these are regular 16v 4AGE injectors ?

Well, I dread to think what cams and valve gear I find in the top of the engine. I *should* find some non-std think cams in there, and I *should* find uprated valvesprings etc... I wonder if I will ?

The white cat is not so good - T3 pipe fits much better

[ZaX]

Yo Ian
The basic formula for calculating fuel requirements is (no. of cylinders x injector flow rate) / 6.75, this equals to about a 90% duty cycle. For example a car with 4 cylinders and 215 cc/min injectors, would have enough fuel for (4 x 215) / 6.75 = 127 hp.

Another useful formula is for calculating the percentage increase of fuel flow through the injectors if the fuel pressure is raised. The formula for this is the square root of (new pressure / stock pressure). So for example let's say you increase your fuel pressure from 38 psi to 48 psi, you percentage increase of fuel would be (48 / 38 = 1.26315). The square root of 1.26315 = 1.12, so you have now increased fuel flow by 12%. So if your injectors are 215 cc/min, you would now have (215 x 12% = 25.8 ) + 215 = 240.8 cc/min injectors.

Some basic info on toyota injectors can be found here.
http://www.aeu86.org/viewtopic.php?t=500

Look what i used to have...a black cat on red top engine.


Then some stupid driver "de-cated" me, so now i have white sparco cat.

[Mux213]

Hey Zax,

your black decatted cat looks alot like my oldest cat

I have 5 cats btw.....

sorry for the offtopic post

[Ian.G]

hehehe,

staying off topic.

some of my other pets (1 cat missing from photo) and my good wife.



back on topic

One of the things I'm trying to determine right now is if the injectors on my car are actually able to supply enough fuel with the ITBs present. I don't have a fuel pressure gauge so I can't tell if the presure as been raised from standard.

I am now completely paranoid that my engine is nothing like the spec it should be.

It obviously has the 20v fuel rail installed and what I think is the std 20v fuel regulator. I guess the 20v runs more fuel pressure than the 16v ?

[Ivan141]

As far as I know, most (except redtop) 4age's run the same 2,55kg/m2 fuelpressure. The standard 182cc injectors could support around 140bhp at that pressure running 100% dutycycle. At 80% that figure drops somewhat to the 115 to 120 bhp mark.
You really should try and keep an eye on the fuelmixture when running a standalone. A WBO2 readout should be standard equipment if you want to keep the engine in one piece.