Later this week im preparing to take out my knocking engine and was considering putting my old NA engine back in for now, although its been stood a couple of years outside, but covered, so im not too hopeful of its internal condition sat so long with the oil drained.

 

So my alternative should i need, is to Take the TT engine out of my UK project and TT the NA, but as im going to save time and use the NA loom, what do i do with the boost hoses, without a boost controller. I know it will be something like 6psi untouched, its just that i may not have time to get one sorted if i do decide to go this route. Obviously a fair bit of TT stuff will need to convert over to the NA.

 

Also i plan to use the manual box (NA) on the TT engine, so my one piece prop is untouched and with the lightened flywheel and clutch from the NA apart from uprating the clutch plate to stage 3, i think im right in saying that it will fit ok.

 

Again any advice on either issue would be great, so i can plan accordingly.

 

Cheers

I guess i could have a manual boost controller which will be just set to whatever as Brian did and Noz suggested, which is a possibility

Nothing m8 leave them Disconnected and Connect the Wast-gate directly to the Balance bar ports ... or on a T .. this will give you Base boost pressure of 6>7psi

 

 

long as the flywheel is for NA and the Gear box is NA type u be good to go .. Clutchs use the same fitment

if its a TT flywheel .. on NA box u will need to space out the starter motor by about 3mm

Or refit the stock lines without the boost solenoid, there's a pair of small brass restrictors, these are what ups stock boost from actuator pressure 6-7 psi to the 9 psi, essentially you will be just bypassing the safety boost feature. That's pretty much all they do.

remember hes boosting an NA engine .. higher comp .. weaker pistons ..

No? He's fitting a spare tt engine into a na chassis?

Cheers for the replies, yes fitting a TT into my NA, so using a TT engine coupled to an NA manual gearbox.NA flywheel and clutch

No? He's fitting a spare tt engine into a na chassis?

 

Doh i read the first line :) lol

 

 

Cheers for the replies, yes fitting a TT into my NA, so using a TT engine coupled to an NA manual gearbox.

 

you gonna have to fit all the TT boost pipe work , intercoolers , Rad , Main ECU , Fuel ECU

Doh i read the first line :) lol

 

 

 

 

you gonna have to fit all the TT boost pipe work , intercoolers , Rad , Main ECU , Fuel ECU

 

Yes i got that lot, just concerned with using the NA loom it doesnt have the boost solenoid wiring, hence the manual boost or non option, and wondered if the NA flywheel will fit the TT, i know its the same block, wondered about the crank or bolt spacing.

You will soon see how to use the stock boost jets without the boost solenoid when you take the block out mate, there's a little tee piece assembly down there. People often remove the stock restriction them wonder why they get unusual results on the boost gauge.

yep NA fly will fit the TT engine .. all same fitment ..

 

just for infomation .. if your TT engine is an Auto .. remember to remove the large flex plate bushing from crank and fit in a Spigot bearing for the manual box

Edited August 4, 201411 yr by MarkDerby

Cool, cant wait lol. The only thing i need to order at the moment is a manual pilot bushing for the rear input spline, as the engine coming out is attached to an autobox, hopefully take about a week to out my old engine, then take out the TT engine, a few days to install pipework, intercoolers etc, then fit the TT, do the fluids and hopefully it will be up and running within 2 weeks, fingers crossed :thumbup1:

Your not going to need the solenoids Graham as your N/A loom will not support them. Just remember though you wont have the low boost on a cold engine protection or the dett/low boost protection either without the noids.

So would adding an electronic boost controller at a later stage help with that? i guess not without the solenoids.

Next question, the TT has a precat, so for now i guess im going to have to use the TT down pipes to cats, as i have an NA set of down pipes and no cats or will the na test/down pipes marry up?

So would adding an electronic boost controller at a later stage help with that? i guess not without the solenoids.

 

Yes, it will. All the solenoids do is open and close another route. If you imagine that there are two lines to the waste gate, when the Wastegate see 7psi it opens this stops more boost building and limits the pressure. So one path or tube has is just a clear tube, this has a solenoid on it that opens and closes. This opening and closing is what causes safety boost. The other line has a little brass restrictor in it like a mig welding tip but tiny, this limits the amount of pressure seen by the Wastegate and delays it's opening. So think of it as a little circuit, the boost solenoid opening and closing to to control the path of air and change the pressure seen to thecwastegate.In reality it's a little assembly of loop system, but it's easier to explain as two lines.

 

In short, if you run an unrestricted tube to the Wastegate your car will only boost to 7psi, if you dig out the restrictor and put that inline so you have a single tube that runs to thecwastegate with the restriction you will get 9spi. This is the exact same principal as to how boost jets work. A boost controllor be it manual or electronic is mearly a valve that adjusts the pressure seen by the Wastegate to cause the engine to boost higher or lower (down to Wastegate pressure) by limiting the air pressure revived.

 

It's also slightly misleading when we say Wastegate, as we mean actuator, the waste gate is Infact inside the turbo and open ones like flap by the actuator, just to clarify. It's a bit hard to explain, once you see it however you will understand it, it's very simple once you can visualise it.

 

Personally I'd just take a direct feed from the Wastegate pop in the stock restrictors and tee these together the single line up to the plenum. Otherwise you be in constantly reduced boost or knowing about with the boost controllor to get 9psi, not something else you need to worry about right this moment.

Edited August 5, 201411 yr by Stephen

Next question, the TT has a precat, so for now i guess im going to have to use the TT down pipes to cats, as i have an NA set of down pipes and no cats or will the na test/down pipes marry up?

 

The turbo elbow comes down 90 degrees leaving a horizontal flat to bolt upto, the same as the NA. Aftermarket TT front pipes and elbows have an odd 45 degree joint so must be used together. So if you unbolt that horizontal flange, next to the steering rack and mirror on the other side you should have a horizontal flange to bolt your na decats too. The only snag here is one of the turbo elbows on a uk car contains a precat, so you would be unbalanced unless you removed the precat or utilised a jap spec one, think it's driver side. Genuinely the worst bit will be unbolting it, the nuts on the flange rust and seize and getting the elbow off can be a mare those tight access turbo flange bolts again seize and rust, not fun. Thankfully your pulling the block, makes that wayyy easier.

 

Again once you strip it down you will soon see what it's all about.

Stock UK/Euro spec cat exhaust sections are like these with the "45 degree" joint:

 

 

so you will need to use them and the downpipes from the UK TT engine. The stock passenger

side downpipe has the precat, which you can remove by rodding it out.

They are quite different to the jap ones arnt they.

Cheers guys, making it easier to see what i need to do now, ive spent years on an NA engine, so now that pretty well, going into the turbo realm is just something i never previously thought too much about lol