Most powerfull Boxster engine

[JP-s-in st. louis]

Gary

I am @ 285WHP and 345 at the crank on a Mustang dyno. Some will say that it does not matter what dyno says what, we all should know that is wrong. After I finish the suspension this next week here is a short list of my next few mods; Cat Bypass pipes (if I can find anyone that will make it), Schrick Cams, Head work looking for a set now to get ported and polished and I may try to see if I can do the GT3 crank like Markski in his 996TT. Oh and an IC when/if iA does finish it up. At that point I can run more boost. :dance:

Now Dave on 6 speed had FVD do a 3.8 transplant. I have the dyno sheet somewhere and IIRC 360 crank

[Gary in BR]

Originally Posted by JP-s-in st. louis

Gary

I am @ 285WHP and 345 at the crank on a Mustang dyno. Some will say that it does not matter what dyno says what, we all should know that is wrong. After I finish the suspension this next week here is a short list of my next few mods; Cat Bypass pipes (if I can find anyone that will make it),



Are your plans to bypass all the cats? What sort of gains do you think you will make.



Schrick Cams,

What sort of gains will theses cams give you and what about the ECU? Will you have to reprogram the ECU with new cams?


Head work looking for a set now to get ported and polished and I may try to see if I can do the GT3 crank like Markski in his 996TT.


Again, what will the GT3 crank do for our cars and can these mods work on a 2.5?


Oh and an IC when/if iA does finish it up. At that point I can run more boost. :dance:



Now Dave on 6 speed had FVD do a 3.8 transplant. I have the dyno sheet somewhere and IIRC 360 crank

With these mods you may be over 400 crank.
That may put you at the most powerful Boxster...good luck.

[boostiality]

Originally Posted by JP-s-in st. louis

Gary

I am @ 285WHP and 345 at the crank on a Mustang dyno. Some will say that it does not matter what dyno says what, we all should know that is wrong. After I finish the suspension this next week here is a short list of my next few mods; Cat Bypass pipes (if I can find anyone that will make it), Schrick Cams, Head work looking for a set now to get ported and polished and I may try to see if I can do the GT3 crank like Markski in his 996TT. Oh and an IC when/if iA does finish it up. At that point I can run more boost. :dance:

Now Dave on 6 speed had FVD do a 3.8 transplant. I have the dyno sheet somewhere and IIRC 360 crank

Correct me if I'm wrong, but I thought our M96 motors have no interchangeable parts to the GT1 block?

Do you mean like putting the M96 3.8 crank into your more? Stroker boxster would be pretty cool.

[2000SoCalBoxsterS]

Originally Posted by JP-s-in st. louis

Gary

I am @ 285WHP and 345 at the crank on a Mustang dyno. Some will say that it does not matter what dyno says what, we all should know that is wrong. After I finish the suspension this next week here is a short list of my next few mods; Cat Bypass pipes (if I can find anyone that will make it), Schrick Cams, Head work looking for a set now to get ported and polished and I may try to see if I can do the GT3 crank like Markski in his 996TT. Oh and an IC when/if iA does finish it up. At that point I can run more boost. :dance:

Now Dave on 6 speed had FVD do a 3.8 transplant. I have the dyno sheet somewhere and IIRC 360 crank

JP, Fabspeed has CAT ByPass pipes. Wouldn't they work for you?

[JP-s-in st. louis]

Gary

Correct at that point I will have no cats. I have seen the Fabspeed and for 500 bucks , I think if I can take the time I can have a set fab'd up and cost less then half that amount.

No extra ECU tunning will be needed for the CBP. As for HP I would expect 5-10 max.

The GT3 Crank was modified on a few of the Protomotive BIG build TT's along with CJV to achieve 9K RPM redline. At that point a full rebuild may be needed. The crank is just an idea as of now and I would have to speak with Tod d Z first.

FVD has a set of 3.8 heads on sale right now. I am curious if these will work on the 3.2. My learning curve and this project will continue to be a work in progress.

I know who all to go to for all this project except the person to finance it. The suspension is getting VERY expensive.

Josh

[boostiality]

Originally Posted by JP-s-in st. louis

The GT3 Crank was modified on a few of the Protomotive BIG build TT's along with CJV to achieve 9K RPM redline. At that point a full rebuild may be needed. The crank is just an idea as of now and I would have to speak with Tod d Z first.


Josh

Josh

Since it doesn't look like the motors are gaining displacement, what positive aspect does the GT3 do compared to the TT? I'm pretty sure they both use the same crank, I just curious what their telling people on the reason why.

Joe

[tholyoak]

The GT3 cars and turbo cars use an engine based upon the old 964/993/GT1 engine. These cranks will not swap into an M96 based motor.

Todd

[boostiality]

Originally Posted by tholyoak

The GT3 cars and turbo cars use an engine based upon the old 964/993/GT1 engine. These cranks will not swap into an M96 based motor.

Todd

Whats up Todd

Can different M96 rotating assemblies be swapped? Like say a 3.6 crank, rods, pistons go into a 2.7 motor ( I mean if we were to bore out the cylinders to accept the pistons) ?? . I'm guessing the motor would be choked up because of the cams and heads though

Joe

[tholyoak]

Joe,

I'm not 100% sure but at least within the same design years I would guess that the journal diameters are the same. You are correct though, the top end would need modification to deal with the larger bottom end. This is why I think it would be cheaper and easier to just start with the bigger motor rather than try and build up a smaller one. Custom engine work isn't cheap and all things considered, crate engines from Porsche are.

Although if you built up a 2.5 or 3.4 into a 3.6/3.8/4.0, you wouldn't have to deal with the electronics issues that can complicate some engine conversions. Problem is you then open up a new can of worms as far as needing custom ECU programming that wouldn't be cheap to do correctly.

Also, a large amount of the difference between the 3.4 swap that was in my car and the subsequent 3.6 engines I have had in the same car comes not from the displacement increase, but the significant torque improvements from the increased cam timing changes that came with the variocam plus system over the basic variocam setup (40 degrees vs 25 degrees if I remember correctly). You wouldn't get this benefit if you modified an earlier motor.

Just my $0.02.

Todd