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(Post Link) post #1 of 52 Old 09-10-08 Thread Starter
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Idea GT JTS tuning

Ok then seeing as were hi-jacking threads left right and centre, here's our own.

As we all know, the JTS in the GT is well underpowered and I am taking this up with ARUK.

How can we get around this problem and have our JTS' performing as an Alfa should??

Intake, the intake is a mess as seen here http://i82.photobucket.com/albums/j2...92008003-1.jpg :http://i82.photobucket.com/albums/j2...92008002-1.jpg

So, quite sure there is room for improvement on the intake side.

Then theres exhaust, removing the pre-cats would give the best gains IMO and they aren't needed for the M.O.T.

Then mapping, Red Dot or AD can re-map the JTS.

With the above I believe 170-175BHP can be achieved. Bear in mind the JTS is around 145-150BHP not the 165BHP that is claimed.

What do you think??
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Graham P
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Re: GT JTS tuning

I think we have exactly the same thoughts about this...spooky

Imagine what could have been done to it had it been 165bhp!!!


I reckon painting the brake calipers red will help aswell

One down, three to go!!! Would make sense for me to get the exhaust done next
 
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Re: GT JTS tuning

I've got the 1.8ts and that was down on power to when I first got it - but I can't help feeling it's lossened up over the past few months. Perhaps...and this purely speculative....Alfa's reach their intended power one you've broken them in?
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Re: GT JTS tuning

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Originally Posted by m4rrk0121 View Post
I've got the 1.8ts and that was down on power to when I first got it - but I can't help feeling it's lossened up over the past few months. Perhaps...and this purely speculative....Alfa's reach their intended power one you've broken them in?
What was the power pre and post remap?

And what was the mileage when you did it?
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Re: GT JTS tuning

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With the above I believe 170-175BHP can be achieved. Bear in mind the JTS is around 145-150BHP not the 165BHP that is claimed.
Crumbs - is this true? I'd heard elsewhere it was only the early JTS engines that had less than the official BHP...
 
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Re: GT JTS tuning

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What was the power pre and post remap?

And what was the mileage when you did it?
It was the one your mate saw.....130 before 147 afterwards, mileage at the time was 800. It seems to have improved steadily since then even taking into account some of the other mods.
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Re: GT JTS tuning

I bet its a good 155bhp or so now.. I've never heard of such a new car being rolling roaded but most TS engines that are a few years old make within 5bhp of their claimed figures..
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Re: GT JTS tuning

engine isnt ever really up to power until 6,000 miles in.
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Re: GT JTS tuning

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I bet its a good 155bhp or so now.. I've never heard of such a new car being rolling roaded but most TS engines that are a few years old make within 5bhp of their claimed figures..
Get em while their young.....(only the cars)

I've also whacked on a cheeky Vipeacross and a lightwieght aux pully for good measure and run her only on 97+ (god knows if it actualy does anything but it definately appears to pull better). Just need to have a lapse from being being tight then I'll sort out the supersprint.
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Re: GT JTS tuning

I'll reply to this post from the other thread in here as its more appropriate:

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Originally Posted by Graham P View Post
Hi PAJ

1) You can have it re-mapped at Autodelta or Red Dot, replace the air intake (I have with the Autodelta one), new exhaust (more for the looks and sound than extra power but I'm sure it will help) and pre-cats as G5een mentioned
2) Re-map is around £250, the air intake is £120 and the exhaust backbox (Raggazzon, Autodelta or Supersprint) around £300. The pre-cats are also £300 ish
3) With all that done you should be getting about 190BHP I reckon. I had it alldone to my 147 2.0 Twinnie and I think that was about 175BHP
4) Shouldn't affect mpg too much. Didn't on my 147
5) Not sure about insurance. Never mentioned it to them with my 147 but would with my GT I reckon. Hopefully shouldn't be much
Firstly, its difficult to 'add up' bhp gained from different individual mods. If you pick the modifications right, they will all complement each other and the sum will be greater than the individual parts, if you get me.

But I struggle to see a JTS making 190bhp from intake, exhaust and remap alone. Thats over 25% increase (assuming it makes 150bhp standard which is probably more like it). I'd say a 10-15% increase is more like it from those mods, so afterwards probably somewhere between 165bhp and 172bhp..

Something like the GSR intake pipe would work wonders on the GT, as its the convoluted pipework more than the filter which is causing a restriction. Then the exhaust, you could possibly just bash the pre-cats out of the standard manifold for a decent gain top-end. Get rid of the main cat too.

But if you really want more power, change the cams. That'll really liven her up. I think Colombo & Barini do a lot of different cams for the Alfa 4-pot engines.. Worth a look I'd say

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Re: GT JTS tuning

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But I struggle to see a JTS making 190bhp from intake, exhaust and remap alone. Thats over 25% increase (assuming it makes 150bhp standard which is probably more like it). I'd say a 10-15% increase is more like it from those mods, so afterwards probably somewhere between 165bhp and 172bhp..
You are right there. I was just talking in terms if the engine was actually the 165bhp stated (fat chance). Probably still hoping a little with 190 but a man can dream
 
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Re: GT JTS tuning

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Originally Posted by Turin Brakes View Post
I'd heard elsewhere it was only the early JTS engines that had less than the official BHP.
What he said.
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What he said.

G5een printout will prove othersie

G5een..... show em your printout
 
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Re: GT JTS tuning

Thanks for the info Guys! Never been in the tuning lounge before, and now it's got me thinking.

What bhp increase do you think you'd get from JUST a re-map? And is there really no improvement in mpg? All the diesel-owners brag about a decent increase in fuel economy when they tune their engines.....
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Re: GT JTS tuning

The problem with a lot of the JTS engines is they left the factory with the wrong inlet cam and an incorrect map - I would get it checked out and get Alfa Romeo to put it right under warranty.

Alfa Romeo forum: JTS low power problem resolved
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Re: GT JTS tuning

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Originally Posted by Turin Brakes View Post
Crumbs - is this true? I'd heard elsewhere it was only the early JTS engines that had less than the official BHP...
Well that was G5EEN'a figures at brand new. There's no doubt the JTS 2.2 does a tremendous amount of loosening up over the first 12-18000 miles so I would guess that there is a similar effect on the JTS 2.0.

WOuld be interesting to see what an 18,000 mile 2,0JTS is outputting.
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Re: GT JTS tuning

RR print out at 1200miles: http://i82.photobucket.com/albums/j2...7092008007.jpg

I to was under the impresion that it was the early JTS in the 156's that were down on power. I think the newer JTS in the 156 aren't so bad due to better intake etc.

A re-map alone should give you 160BHP I'm not sure that it will loosen much as modern engines are built to very fine tolerances, were not talking the old V8 chevys here.

The big gains will be from cams/throttle bodies but then you're losing driveability and spending mega bucks.

My guess (hope) is 170-175bhp with pre-cats, intake and map. The main cat would release a few horses but then you've got M.O.T time (not an issue if you know someone who know's someone ) but the exhaust note would take a turn for the worst.

If only we had the 165bhp to begin with.
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Re: GT JTS tuning

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WOuld be interesting to see what an 18,000 mile 2,0JTS is outputting.
Ian D cross's, 30,000+ ran virtually the same as mine, if I remember mine pulled a bit more torque after the session.
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Re: GT JTS tuning

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What bhp increase do you think you'd get from JUST a re-map? And is there really no improvement in mpg? All the diesel-owners brag about a decent increase in fuel economy when they tune their engines.....
You'll notice the difference after the map.
Slight improvement in mpg, but more noticeable on the motorway.
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Re: GT JTS tuning

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I
I reckon painting the brake calipers red will help aswell
I'm one step ahead then
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Re: GT JTS tuning

I'm holding fire at the mo on the whole car thing as still hoping it will get some interest from Pistonheads and I can finally get a V6 (the GTV being my favourite at the moment as I really miss my GTV Twinnie....obviously the GT is the best looking motor I have ever owned but the GTV was by far the most fun)

Hopefully once I have a V6 that will be the end of my moaning about lack of power. Probably not though
 
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Re: GT JTS tuning

Good luck with the sale.

More info on a JTS cam here:https://www.alfaowner.com/Forum/tunin...-2003-jts.html
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Re: GT JTS tuning

Another top mod is a power boost valve.

Electric supercharges are great too, thanks to the 'swirl technology'

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Re: GT JTS tuning

Thanks

if I don't get any interest in the next month or so then it'll definitely be re-map time
 
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Re: GT JTS tuning

Suprising how much difference the re-map makes.
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