97 4.0 light turbo Q

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Jul 10, 2023 | 05:28 AM

zs&tas

Thread Starter

Member

Joined: Feb 2009

Posts: 140

Likes: 9

Model: Cherokee

97 4.0 light turbo Q

Hi all , actually I have a 97 Grand but you all have much more traffic and collective knowledge and it's a 4.0 i6 so relevant.

I am wondering what the max Intake pressure can be with no mods - stock computer being happy on my 97 grand?

I have heard 7psi .
Ant

Jul 10, 2023 | 11:52 AM

Randy Bobani

Seasoned Member

Joined: Jul 2020

Posts: 347

Likes: 132

From: Sand Pit

Model: Cherokee (XJ)

Quote:

Originally Posted by zs&tas

OE head gasket pops at 10 PSI.

Jul 10, 2023 | 03:30 PM

zs&tas

Thread Starter

Member

Joined: Feb 2009

Posts: 140

Likes: 9

Model: Cherokee

Quote:

Originally Posted by Randy Bobani

OE head gasket pops at 10 PSI.

Good to know 😃

Jul 10, 2023 | 08:51 PM

Seabee

Junior Member

Joined: Jul 2022

Posts: 53

Likes: 9

From: Southern Illinois

Year: 1994

Model: Cherokee (XJ)

Engine: 4.0

I'm surprised that stock MAP sensor can monitor/respond to elevated pressures. Good to know!

Jul 11, 2023 | 07:30 AM

Cummins93

CF Veteran

Joined: Mar 2015

Posts: 1,203

Likes: 155

From: Northern CT

Year: 1995

Model: Cherokee

Engine: Turbo 4.0

Quote:

Originally Posted by Seabee

I'm surprised that stock MAP sensor can monitor/respond to elevated pressures. Good to know!

It can't. You would need to install a 2 bar map sensor and tune the ecu to interpret just the 0-2.5v range for atm. Then use the 2.5-5v range for boost.