2.8 turbo on a 2.5?

tonycrd · **Posted:** Mon Nov 10, 2008 4:12 pm

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?

RTStabler51 · **Posted:** Mon Nov 10, 2008 5:09 pm

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?

tonycrd · **Posted:** Mon Nov 10, 2008 5:18 pm

Now there's the trick, the old 2.8 doesn't have variable vanes....

ATXKJ · **Posted:** Mon Nov 10, 2008 5:26 pm

isn't the vane control vacuum? - wouldn't you just need the appropriate vacuum line?

Sir Sam · **Posted:** Mon Nov 10, 2008 5:56 pm

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.

MrMopar64 · **Posted:** Mon Nov 10, 2008 8:38 pm

The old 2.8 was a wastegated turbo. That turbo was/is the same as the 2.5L turbo.

Uffe · **Posted:** Tue Nov 11, 2008 2:50 am

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

tonycrd · **Posted:** Tue Nov 11, 2008 7:16 am

Yeah, that would then be a waste of time.

DarbyWalters · **Posted:** Tue Nov 11, 2008 8:56 am

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.

MrMopar64 · **Posted:** Tue Nov 11, 2008 10:32 pm

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.

2.8 turbo on a 2.5?

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