[MasoElCaveman]

You can visually compare the two at below link. I’ve organized them for easier comparison below the link.

Tech - Oil Pump Comparison - OEM Mitsubishi Oil Pumps | 3SX Performance Home Page

The world's oldest and largest 3000GT and Dodge Stealth Source for Performance, Maintenance, and Service

www.3sx.com

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Thanks for the comparison images! I was actually comparing those last night and was gonna post them, but you saved me the work!

I mean looking at those images I can't spot any differences.

I think at this point I'll just have to visually compare the two pumps and see if any of the pathways are actually any deeper or anything.

 

[white93gt]

Thanks for the comparison images! I was actually comparing those last night and was gonna post them, but you saved me the work!

You're welcome for comparison images, they’re easier to compare when side by side. As far as pressure spring difference, I don’t see why you couldn’t just take spring out of your TT pump and put it in a new NA pump. I don’t recall anybody mentioning relief springs breaking in the pumps, mostly gear set wear/crack or case wear.

 

[MasoElCaveman]

I'm just writing here again to confirm the NA oil pump fit perfectly into my TT. I had the mechanic swap out the oil relief spring (part # MD174687) before installing it. Just got back from the shop and all seems well. Bonus the '99 lifters in there make my engine sound so smooth, am very pleased with the new found silence. That combined with the new polyurethane motor mounts really add a pleasant feel and sound. Though, the rear mount is still the stock one because my mechanic was not comfortable removing it due to how rusty everything is.

I do however have a new issue where my turbo makes this air wooshing sound by the drivers side and my engine hesitates when I do this. Only occurs at half throttle and more as the rpms really rise. But this is a new problem for a new thread, or likely old problem old thread lol. Mechanic did a full boost test and all was sound. Gonna look for this rear turbo o-ring that's supposed to be where it meets the intercooler as that's his main suspicion...

Thanks for the discussion!