Protomotive 3.8l built
 

Hello Friends,
Todd.K built a 3.8l engine for my 996 GT2:D.

More pics

looking good bro! this setup will certainly kick some ass! i bet you see 800hp pump and 900+hp with race fuel!:eek:

Congrats man! Looks killer.

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Thank you Guys:),i will run it on my A30/76 on more boost,if not satisfied will go with GT30/86hta .

You're gonna have fun with that! Enjoy!

You can never go wrong with Protomotive!
Congrats
Robert

I see 3.6 motors making just as much power if not more .... So other then the cool factor is there any other reason to do a 3.8?

I can't grasp why you would do it either unless you already need new pistons and liners. Then hopefully the pistons and liners are better than stock, which is not often the case.

In most cases,,a larger engine will have better throttle response and more power off boost And IF IT CAN get feed enough it will make more power on the same boost levels..

That is a good question. I know Tim posted that the 3.6L lasts longer hours wise than the 3.8 and 4.0 options. OP do you know if the pistons are CP or something equivalent. I don't know much about the protomotive builds though.

I don't know about making more power at the same amount of boost

On the average, 3.8 will make 5% more power at the same boost level then a 3.6. Also you should be able to build a 3.8 L for the same price as building a 3.6 motor. I think if you're going to tear into the motor this is a cheap place to make more power. Remember that I am from Texas, our state motto is bigger is better!
Robert

i asked layinback this exact question when he did his... 40 more rwhp and better off boost response. nice upsides. 5000$ in parts plus labor big downside!! for my limited budget i couldn't see the hp vs dollar

Nice build man, enjoy it.

Today was a rainy day,nothing to do so i decided to go to my shop to remove the engine:),it tooks me 4 hours to do it,first i removed the bumper,ICs,Exhaust and turbos,cooling hoses,etc... then removed the engine/transmission.

You redid the under drive pulley and wheel? Why did you upgrade it? What does it do? I lack knowledge in this area. Thanks for any help!!

[QUOTE=Wealth Manager;4064430]You redid the under drive pulley and wheel? Why did you upgrade it? What does it do? I lack knowledge in this area. Thanks for any help!![/QUOTE






Lighter and smaller easier to turn requiring less HP to turn.

[QUOTE=johnspeed;4064437]
So the difference is minimal? Does it make it safer when raising the Rev limiter?

[QUOTE=Wealth Manager;4064438]
the original idea was a better mounting to the crank cause they were spinning off and coming loose, then they improved the rest of design made them smaller, and drive the accessories slower also.

The fact the 3,8 kit I bolt was fitted with ductile liners was more important than the gain to 3,746cc.
Mine is from FVD/Mahle, I see Todd uses another brand on Ali's and Dave's pictures but I believe their liners are ductile as well.
The 5% displacement gain is not all, the little lower CR allows a little more boost before knocking, and more power.

Isn't there also the downfall of going 3.8l since the sleeves will be thinner and won't last as long and can be prone to cracking??

Please bring this to Byblos this summer!

[QUOTE=OS Inspector;4064456]exactly!

No that is not a problem at 3.8.It can be a concern though with the next size bigger liner.

But my concern with aftermarket pistons and liners is longevity. Stock pistons and liners are quite reliable and durable. They also do not experience as much oil blow by due to hot/cold expansion contraction issues like many CP pistons which are race intended. In my experience their is no sense upgrading engine internals to race spec parts when you want to daily drive unless you intend on more frequent rebuild intervals. So that being said, wouldn't you get the same gains with some head work and maybe cams? Maybe throttle body upgrade and larger y-pipe? And those mods are not going to induce more problems if properly done. Just my $.02

That being said, to the OP. I think you will be extremely happy regardless. Enjoy!

Yes it all boils down to how much does some want to give up or Pay for that little extra power. . LOL
How many have pushed their projects from a reliable Street car to a weekend warrior only?

I completely agree.

Vagscum have you seen someone wear out a forged 996tt motor? Forged piston ductile iron liners I mean.

No. I am more concerned with pistons. I have seen other motors built with CP pistons burn excessive oil to the point of driving the owners nuts. The alloys used for many aftermarket pistons is different than stock causing more expansion and contraction as a result of temperature. This will cause additional wear. Considering the number of high mileage stock motors out there speaks for the strength of the stock pistons. I just think their are many other things to update before pistons and liners should even be considered.

Ask the Audi B5 S4 guys with 3.0 liter builds how they feel about aftermarket pistons when jumping form 2.7l to 3.0. Many have reverted back to stock pistons because they work and are reliable with less oil consumption.

FWIW, I built a motor one time (not a Porsche, but I bet similar situations could happen)

I was dealing with a specific speed shop/tuner who had built several of these motors. I bought forged pistons through him, based on "our" goals with the motor. He ordered them at 3.500 in diameter. (That was "factory spec" meaning no boring.)

Well I get he pistons and head to the machine shop to have everything balanced...my machine shop (I trusted) came back to me and said look...the bore on these cylinders in 3.500, it is 3.504. In the end the tuner took the pistons back and I had my machine shop measure and ordered another set based on those measurements.

I'd be willing to bet that much difference would give a premature oil burn over stock.

Just food for thought. I really don't want to tear into my motor.

tim recommends using the stock pistons for what its worth. $5000 is a lot for the 3.6 to 3.8. if you have a ton of money, do it. not part of MY budget tho!

I am willing to bet Porsche puta ton more research into their piston on just the 996TT than CP did. And the mileage, power and durability speak for the product. Don't fix something that isn't broken.

I know and believe Mahle pistons are superior to most out there.
They make a lot of import OEM pistons besides aftermarket ones..
I have used many types of pistons in my life on my bike and muscle car builds and Mahle stands out.
Also since Porsche has there own sort of Nikasil coating on sleeves , you would have to get the after market liners coated to keep the same durabilty.. I sent my cylinders and liners, bike, out to Langcourt..

first start:):

Thanks bro..

That didn't take long. Impressive. She sounds great.

She is alivessss!!

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