Jtd 1.9 16v, question about fitting a new (bigger) turbo - Alfa Romeo Forum
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(Post Link) post #1 of 8 Old 09-03-17 Thread Starter
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Jtd 1.9 16v, question about fitting a new (bigger) turbo

So I got my hands on a GT2260V, what would the process be of making it work on my car? All the fabricating and plumbing is not a problem, I'm asking on the software side of things. Can it be driven without a remap? I'm assuming it regulates the boost from the map sensor readings and should be able to keep the boost in the stock range?

There aren't really people that can do the software on the jtd's over here, and I'd like to aquire all the necessary hardware and software to do it myself over time, was just wondering if the turbo can be fitted and then mapped at a later stage?
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Yes you can fit the turbo and drive the car.
But expect bad driveability, and random MCSF from time to time.

Boost is not regulated just from MAP sensor readings.
There are VNT pre-control maps which are there to help speed up boost response and keep overboost low.
Those maps are adjusted specifically for the turbo you have on the car, and when you fit bigger turbo, boost control will be all over the place during transitions (after every gear shift or when engine load changes).

Also GT2260V is not the best choice. It is too big for this kind of engine.
Except if you don't mind no boost below 2500rpm and you care only about top end power...
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(Post Link) post #3 of 8 Old 09-03-17 Thread Starter
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Was thinking it's a bit too big. My end goal for it would be ~230 reliable bhp which I think isn't too unrealistic.

The late boost wouldn't be too big of a dealbreaker as the standard turbo already boosts late (2200-2500ish on my car)

Sounds like a bad idea to fit this turbo and drive it just like that though. With the standard map, does the ECU have the ability to compensate for aditional boost above the requested value with fuel in the event of boost spikes?
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Standard turbo should boost at around 1700rpm...
You have some mechanical problems if you achieve boost only at 2200rpm.
Most likely EGR or vacuum problem.

For 230BHP you need something like GTB2056 or GTB1756 + FMIC.
That would be the best setup for great driveability and decent performance.
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(Post Link) post #5 of 8 Old 09-03-17 Thread Starter
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I was also thinking 2056, but a 2260 fell into my lap and thought why the hell not.

I'll check again, but I went over the entire engine compartment, and temporary blocked the EGR because I thought it was boosting a bit late but the boost still only comes in noticeable at the 2200 rpm range. From what I've read and heard from other people with the same engine, that's just how it is? It's a 2005 GT, so first spec.

I haven't checked the vacuum to the actuator yet, at idle there should be full vacuum and with throttle applied the vacuum should vade away?
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I have same engine only in a vx astra a hybrid turbo gt1756 with fmic and std fueling i make 230bhp and boost comes on around 1800rpm
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(Post Link) post #7 of 8 Old 09-03-17 Thread Starter
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Standard fueling as in not remapped?
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Yes remapped definitely but just using stock fueling components.
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