Well after the brilliant Peter mapped and GSR'd up my 1.4 150 Tjet on Monday I've caught the tuning bug.

Whats the next logical step to get me some nice gains? I've heard lots of things being thrown about but what is really worth considering for some series extra powah?

Upgraded Intercooler?
Full exhaust system? (£350 for less than 10bhp I've been told, but does it help talkies (Torque)?)
Peter suggested twin turbo-ing it? Which I really am considering, what else would I need to do and has anyone done this before?

Anything else? Don't want any chavvy styling mods, I like the idea of driving a bit of a sleeper.

Probably first thing would be turbo back exhaust for biggest gains straight off but would need to re-map otherwise it will over-boost

RitmoMan said:

Probably first thing would be turbo back exhaust for biggest gains straight off but would need to re-map otherwise it will over-boost

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No issues getting it mapped again. What kinda gains are we looking at and for what cost?

I'm pretty much willing to pay what it takes within reason to get myself a nice 'hot hatch' here.

So say I was to lay down £620 (£1k budget - what I've already spent) on the table just for engine tuning, what would be my best course of action?

Gains I wouldn't want to guess. I know some cars get really big gains like EVOs and STIs. To get 40-50atw out of an EVO just with a full exhaust is common.
Not sure of pricing for full TBE for this car.
You wouldn't need to upgrade the intercooler until you upgrade the turbo. As it's front mount this cooler works nicely anyway unlike the toop mount intercoolers on Subarus which suffer badly from heat soak.

Do you mean bi-turbo it or twin turbo it? As it is a standard 4-pot engine I think bi-turbo is easier - I can't get my head round how a twin turbo affair would work on a standard engine block - I had a twin turbo previously but it was a V6 so made sense...I can't work it out in my head for a twin turbo.

DickBarton said:

Do you mean bi-turbo it or twin turbo it? As it is a standard 4-pot engine I think bi-turbo is easier - I can't get my head round how a twin turbo affair would work on a standard engine block - I had a twin turbo previously but it was a V6 so made sense...I can't work it out in my head for a twin turbo.

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Personally I'm sure not, Peter was talking about putting another turbo in so I assumed that meant two?

RitmoMan said:

Gains I wouldn't want to guess. I know some cars get really big gains like EVOs and STIs. To get 40-50atw out of an EVO just with a full exhaust is common.
Not sure of pricing for full TBE for this car.
You wouldn't need to upgrade the intercooler until you upgrade the turbo. As it's front mount this cooler works nicely anyway unlike the toop mount intercoolers on Subarus which suffer badly from heat soak.

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standard intercoler on the t-jets is poop.





your best bet peevzy isto contact forge about using there FMIC developed for the tjet GP and having it modified to fit.


exhaust wise, im using a custom cat-back jobie at the moment and it helped unleashe an extra 6bhp/15lbsft when re-mapped at Red Dot.

and what the hell are you on about with a turbo back it will overboost?

how is that possible seing as the boost is controled by the actuator and not the exhaust?


you NEED the exhaust as free flowing as possible on a turbo.

clawliger said:

standard intercoler on the t-jets is poop.





your best bet peevzy isto contact forge about using there FMIC developed for the tjet GP and having it modified to fit.


exhaust wise, im using a custom cat-back jobie at the moment and it helped unleashe an extra 6bhp/15lbsft when re-mapped at Red Dot.

and what the hell are you on about with a turbo back it will overboost?

how is that possible seing as the boost is controled by the actuator and not the exhaust?


you NEED the exhaust as free flowing as possible on a turbo.

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I've emailed them, there about 2 hours away but I'm willing to travel if they can make a big difference. I've asked about the FMIC, but tbh I can't work out what it does or how much of an increase it's likley to give for what money?

Any links/threads or explaination that could help me?

Peerzy said:

I've emailed them, there about 2 hours away but I'm willing to travel if they can make a big difference. I've asked about the FMIC, but tbh I can't work out what it does or how much of an increase it's likley to give for what money?

Any links/threads or explaination that could help me?

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A FMIC is an all alloy front mount intercooler.This lowers charge temp on the intake side of engine.What this means is that the lower the temp,the denser the air=more power as colder denser air combusts easier also allowing the fuel to be cooler in chamber aswell meaning no pinking when boost turned up

You cannot twin turbo a 4 cylinder engine,well you could but far too much money and not worth it as you would need 2 smaller turbos than what is already fitted to create same boost pressure as quickly.He would have meant fitting a bigger turbo wich means bigger exhaust needed to allow better flow,better FMIC,bigger injectors,maybe some head work i.e gas flowing,bigger valves and better cams,and a custom re-map.You would then need better clutch to cope with power,lightened flywheel since box is off,better brakes upfront,better suspension as it will go alot faster round corners and to be fair it doesnt handle worth a monkeys standard!!

For your 1k budget ide go for cat back exhaust,air filter and re-map.Keep it simple and their is less things to go wrong unless you have plenty cash then ask for all mods as stated above

i agree, but also id add a adjustable actuator to that list ad either a de-cat or sprts cat.

Better FMIC is a must, not necesarily a bigger one as they can hinder spool time.

injectors from the abarth essesse fit, just find the part number and youd be able to get them from the manufacturer.

Exhaust and FMIC is all you would be able to do for your budget. After that your at turbo limit and injector limit so they both need replacing.

yes.

why wouldnt a twin turbo work on a 4 pot?

I recently help take a turbo unit off an RX7 which was a twin turbo. all it was were a pair of turbos bolted onto a block. These are Wankel engines so obviously not V engine.

isnt there a VW engine that has a supercharger up to X-rpm until taken over by a turbo charger?

EDIT:yes VW have! its the 1.4 TSI engine- see here

Big Black Stilo said:

why wouldnt a twin turbo work on a 4 pot?

I recently help take a turbo unit off an RX7 which was a twin turbo. all it was were a pair of turbos bolted onto a block. These are Wankel engines so obviously not V engine.

isnt there a VW engine that has a supercharger up to X-rpm until taken over by a turbo charger?

EDIT:yes VW have! its the 1.4 TSI engine- see here

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I didnt say it wouldnt work just not feesable expense wise when you can just fit a larger turbo.The onlt twin turbo set up ive seen was on a m8 of mines cossie the first turbo was t3 sort of size second turbo was a monster sized thing the small turbo spools up and creates the pressure for the second bigger turbo then thats when the boost hits.Need comlicated management etc to run this set up aswell just not feesable expense wise

punto_matt said:

Exhaust and FMIC is all you would be able to do for your budget. After that your at turbo limit and injector limit so they both need replacing.

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What kinda gains you recon I could be looking at for the FMIC and new exhaust?

clawliger said:

i agree, but also id add a adjustable actuator to that list ad either a de-cat or sprts cat.

Better FMIC is a must, not necesarily a bigger one as they can hinder spool time.

injectors from the abarth essesse fit, just find the part number and youd be able to get them from the manufacturer.

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Actuator make much of a difference? Never even heard of one? Expensive and easy to fit?

Injectors make much of a difference and again any idea on expense and possible gains?

Gains would probably be up to about 200bhp your not going past that though on standard turbo as it cant get any more power out of it and injectors are needed for the fuel so they have to be uprated to get more fuel in there otherwise you will be starving it of fuel. (i think i may not be right here and am probably wrong as my knowledge is limited)

punto_matt said:

Gains would probably be up to about 200bhp your not going past that though on standard turbo as it cant get any more power out of it and injectors are needed for the fuel so they have to be uprated to get more fuel in there otherwise you will be starving it of fuel. (i think i may not be right here and am probably wrong as my knowledge is limited)

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Spot on m8

I think 200hp is a little optimistic considering the size of the engine and probably the turbo. Surely it can be done but the question here will it still be a reliable daily driver? Also you need to look at your injectors and fuel pump. My suggestion is maybe look into an intercooler and exhaust system and leave it at that or buy something with more potential like a Golf GTI.

200bhp is easily achievable with the current 150 turbo. There are Tjets running 260bhp so got plenty of tuning to go yet.

I'm not familiar with 1.4 tjet engines but my common sense tells me it'd use a rather small turbocharger for the 1.4 engine to spin without any noticeable lag. General rule of thumb is you can push the boost pressure up a little bit with some tuning without running into problems. However on small turbochargers you start running out of it's efficiency range and start pushing hot air. This is of course only one thing to look at.

One should consider the safety and reliability of the whole package (injectors, fuel pump, clutch, gearbox etc.) when modifying. So I am not saying a 1.4 tjet can't do 200hp I am just suggesting him to consider the reliability side of things and of course money spent vs. hp ratio.

Again, I'm new to the Fiat world so I'd appreicate any technical info or links to other projects with similar outcomes so I can read and learn.