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 Post subject: 2.8 turbo on a 2.5?
PostPosted: Mon Nov 10, 2008 4:12 pm 
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You think this would work? I'm tinking about doing it, old series '02-'04 2.8 turbo on my 2.5.

It should spool up earlier....

I may need a blow of valve?

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PostPosted: Mon Nov 10, 2008 5:09 pm 
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I'm not that familiar with either engine when it comes down to nitty gritty details, but can the 2.5L control the variable vanes on the 2.8L turbo?

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PostPosted: Mon Nov 10, 2008 5:18 pm 
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Now there's the trick, the old 2.8 doesn't have variable vanes....

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PostPosted: Mon Nov 10, 2008 5:26 pm 
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isn't the vane control vacuum? - wouldn't you just need the appropriate vacuum line?

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PostPosted: Mon Nov 10, 2008 5:56 pm 
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ATXKJ wrote:
isn't the vane control vacuum? - wouldn't you just need the appropriate vacuum line?


The VGT turbo is vacuum actuated, however there is a vacuum solenoid control which is activated by a PWM signal from the ECM.

So no, it really is not that simple - but shouldn't be too hard, hopefully Mr Mopar can fill in the gap.

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PostPosted: Mon Nov 10, 2008 8:38 pm 
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The old 2.8 was a wastegated turbo. That turbo was/is the same as the 2.5L turbo.


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PostPosted: Tue Nov 11, 2008 2:50 am 
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MrMopar64 wrote:
The old 2.8 was a wastegated turbo. That turbo was/is the same as the 2.5L turbo.


Good to know, especially for tony ;)

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PostPosted: Tue Nov 11, 2008 7:16 am 
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Yeah, that would then be a waste of time.

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PostPosted: Tue Nov 11, 2008 8:56 am 
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If it is a mechanical wastegate...you could get a HKS or other maker (Greddy/ect.) "Wastegate Controller" which will let you hold the wastegate closed and let it bleed off at higher psi. That will give you much more bottom end.

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PostPosted: Tue Nov 11, 2008 10:32 pm 
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It won't make it spool any faster, and when you make the wastegate open later and make more boost, the ECU will throw a code for boost pressure too high and then you're in limp home.


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