I would recommend getting OEM maybe try extreme psi

Drewzdude said:

So I'm looking to upgrade my oil pump just because I'm taking whole motor out doing everything. I'm looking at running 30 lb to 35lb of boost if that matters. The one I can get from O'Reilly's is just a oem says no high pressure or high volume. Wondering if that matters. I'm not sure if going bigger bore yet just got head off and collecting everything then gonna pull motor out and go at it. Also in need of a transmission rebuild kit for a 5 speed manual looking to handle 450 to 500 hp

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You don't need a high pressure or high-volume pump, but I'd advise you to stick with OEM. The part number for the 7-bolt is 1211A164, and is a good investment to prevent headaches with aftermarket parts.

Ok cool thank you guys

Anyone try melling oil pump before? it's cheaper by half the price of psi extreme. It's OEM but just wanna make sure I'm getting a good one.

Drewzdude said:

Anyone try melling oil pump before? it's cheaper by half the price of psi extreme. It's OEM but just wanna make sure I'm getting a good one.

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Melling isn't the OEM, it's just an aftermarket part. The only OEM is straight from Mitsubishi.

Found there site 343 after shipping thanks again

As far as the transmission rebuild goes that’s not much of a possibility, there’s no “complete kit” as most of the required parts were only offered straight through Mitsubishi and many of those required parts are no longer offered and completely out of stock. If your transmission is in good working order now there’s things you can do to help assure it lives and isn’t hard to do at the power you’re aiming for if you play your cars right, if it’s in need of a rebuild a few of the reputable know transmission guys on here could likely rebuild it with what’s salvageable, good usable parts from other transmissions, and the new parts they still have available on hand. Sadly, a full stock rebuild with all new parts or an “upgraded” synchro trans with all new parts is not a possibility in the year 2022.

I've run ACL pumps in all of my builds. 80 psi cold start. 18 lbs HOT idle. Never had a problem even up to 9200 rpm.

1990TSIAWDTALON said:

I've run ACL pumps in all of my builds. 80 psi cold start. 18 lbs HOT idle. Never had a problem even up to 9200 rpm.

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I’m curious straight cut oil pump gears or helical ?

awdmonster1904 said:

I’m curious straight cut oil pump gears or helical ?

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Marty will likely answer better but I do not believe you can use the OEM pump or gears with the aftermarket front cases, I keep meaning to look deeper into this myself as I have a set of straight cut gears here but I believe that is the answers I found a few years ago but someone can likely clarify. I know if they can’t be used I’m not too concerned as the helical cut gears don’t bother me but to be fair I’m not reving it out real high either.

awdmonster1904 said:

I’m curious straight cut oil pump gears or helical ?

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Helical and factory stub shafts for BSE.
I still open them up for inspection and put assembly lube in them and reassemble.
@Spleen8urLSX, I have a couple old pumps from 90 motors. I need to open one up and then see if they fit into a aftermarket case that I have from some visual comparisons I did a while back HERE. Maybe I can put an answer to that question.

1990TSIAWDTALON said:

Helical and factory stub shafts for BSE.
I still open them up for inspection and put assembly lube in them and reassemble.
@Spleen8urLSX, I have a couple old pumps from 90 motors. I need to open one up and then see if they fit into a aftermarket case that I have from some visual comparisons I did a while back HERE. Maybe I can put an answer to that question.

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There is an old mitsu TSB that says yiu cannot mix helical and straight between pumps but I don't know why. The helical were supposed to be an "upgrade". THe problem was the straight cut whine when the car is cold. I experienced this first hand owning a low mile 90 when almost new.

1990TSIAWDTALON said:

Helical and factory stub shafts for BSE.
I still open them up for inspection and put assembly lube in them and reassemble.
@Spleen8urLSX, I have a couple old pumps from 90 motors. I need to open one up and then see if they fit into a aftermarket case that I have from some visual comparisons I did a while back HERE. Maybe I can put an answer to that question.

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I wonder if there’s a way to recondition straight cut gears from the 90 oil pump

WAY BACK in the day we would dress the gears and polish the mating surfaces so there was no bleed by but those were different designed pumps in domestic cars. Once scoring or marring exist in the aluminum pump housings, you can't fix them. Or not that I know of.

1990TSIAWDTALON said:

WAY BACK in the day we would dress the gears and polish the mating surfaces so there was no bleed by but those were different designed pumps in domestic cars. Once scoring or marring exist in the aluminum pump housings, you can't fix them. Or not that I know of.

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Gotcha so if the insides look good we can polish it and use them

Wonder how hard it would be to make measurements of a helical gear set and just make them straight cut/fittable(new word I invented, eat me) in aftermarket cases?

I know frontline fab did a lot of work designing a front pump but I never heard anything else from it.

awdmonster1904 said:

Gotcha so if the insides look good we can polish it and use them

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As long as you don't have gouging or scoring on the inside and/or outside of the gear surfaces (where it spins, on the edges) or the case machined area you should be ok. Especially if they are straight cut. I hope I'm not giving you any bad info. Pictures are helpful.

CrackedDSM said:

Wonder how hard it would be to make measurements of a helical gear set and just make them straight cut/fittable(new word I invented, eat me) in aftermarket cases?

I know frontline fab did a lot of work designing a front pump but I never heard anything else from it.

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I do know Mike Lester (Buschur’s) was looking into having new straight cut gears made a few years back but to my knowledge it never came to fruition, likely due to the overhead cost of not just buying the material but having it CNC’d and such they’d probably not even be worth it with them breaking even let alone making any profit on them. To add that was before the Covid-19 hit and prices skyrocketed.

I wouldn’t rule it out just yet but someone with machining capability and their own CNC machines would have to pull that trigger.

Spleen8urLSX said:

I do know Mike Lester (Buschur’s) was looking into having new straight cut gears made a few years back but to my knowledge it never came to fruition, likely due to the overhead cost of not just buying the material but having it CNC’d and such they’d probably not even be worth it with them breaking even let alone making any profit on them. To add that was before the Covid-19 hit and prices skyrocketed.

I wouldn’t rule it out just yet but someone with machining capability and their own CNC machines would have to pull that trigger.

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I did see someone on FB making them
I’m gonna look for the post

awdmonster1904 said:

I did see someone on FB making them
I’m gonna look for the post

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I would think someone would have to be now. Ever since I exited social media land I only see what gets shared on here, even not using them I’d love to see someone making them.

awdmonster1904 said:

I wonder if there’s a way to recondition straight cut gears from the 90 oil pump

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Just as an option, if the gears are not worn much and you want a little insurance for them, maybe you can try the Calico CT-10 coating. It's not expensive. When I did, it costed about $16 + shipping for the gears and the stub shaft.

I just looked up the post for the guy that’s making them on DSM nation fb group.

Wow, what a great reminder for why forums are better. There are comments and updates from 18 weeks ago mixed with 1 week ago.

From what I could tell, “version 4” was almost perfect and they were being test fitted into an oem pump.