bgoetz

You won’t find a builder that will warranty track, there is just too much possibility of “user error”. I too track my cars and after talking it through with Jake am very confident that his stage 2 is a very robust build up to the task.

I have only ever seen one Nickies failure (scoring) and it was on a build that the guy had a bad injector and refused to use the proper oil at proper change intervals and never let the car warm before having at it. Steel sleeve on the other hand seem to be very problematic….

Durling21

My Indy mechanic that does rebuilds (Shop is literally next to LN engineering building) told me on the 9a1 most bore scoring are from injector issues. Especially with all the ethanol in fuel nowadays they start to leak a little and wash out the cylinders and then you get scored bores. He said other than that 9a1 failures are rare.

997ajk

From my reading bore scoring in 9A1 occurs from two issues:
1- beating on the car when cold / lugging when cold (80% of the cases)
2- issues with fueling system (leaky injector) (10%)
3- fuel dilution from short trip and long oil change intervals (9%)
4- other (1%)

I had my motor replaced due to scoring (9A1) , reason cold climate with short trip interval and previous owner driving it like he stole it.

Great read on iron vs nickies
https://rennlist.com/forums/996-foru...-liners-6.html

http://www.911uk.com/viewtopic.php?t=101009

some more:
https://rennlist.com/forums/996-foru...ndation-3.html

Sleeves:
https://www.capricorngroup.net/en/en...linder-liners/

https://westwoodcylinderliners.co.uk...ation/porsche/

997Troy

Well this kinda sucks, I haven’t had any 4.0L owners chime in yet. I’ve sent messages to two separate owners and one responded saying overall he’s happy with his new motor. It’s weird but I feel like most guys just disappear after rebuilding their motors lol. No follow ups or feedback..The info is literally non existent in terms of finding out current running conditions after break in, performance gain etc.

I’ve seen quite a few Cayman Deman 4.0, 4.2 and 4.5L builds floating around that I’d love to have done(same 3.8L motor as the 997.2 Carrera S). I wish swapping a cup or RS Motor in was more common cause I found a 991.1 RS swap locally for really cheap 🤔

Side note: How much would a blown 3.6L 9a1 sell for if I found another swap?

bgoetz

I talked with Optionman1 who was quite helpful. He purchased Bronze’s 997.2 after he had and FSI build and then unfortunately PDK failure which put him over the edge causing him to sell before even getting the motor broken in.

If you sit through one of Jake’s sales webinars, which as I mentioned are well worth it, he does provide dyno info. From what I recall one of his stage 2 4.0 will see around a 50whp bump for a 3.8 997.1 but the real change is the overall torque curve which is basically flat from like 4K on. I am not sure you see these gains from an LN build or anyone else because Jake does head work and other special touches.

Sneaky Pete

I went the 4.0 route about 5 years ago and have not looked back. I added a few things as you can see from my sig. Very happy with the grunt the car has with the low end torque.

Xios

Didn't think a bad O2 sensor could cause this. I've got a bad, bank 1 #2 sensor. Don't mean to hijack, but does it pay to change all 4?

JRBucks

Your front O2's make the adjustments to the fuel, the rears just calibrate the fronts. So you should do either both fronts, both backs or all 4, imo.

Xios

I'll probably change all 4. For the rear O2 sensor I got the Bosch form Pelican (9A1-606-177-01-m14). Significant price difference form the Porsche labeled sensor. Is this what I should be using? Anyone have issues with these? Thanks.

997Troy

Still here making decisions guys!

I have a question, what’s the going rate for a non running 3.6L 9a1? I’m considering getting a 3.8L 9a1 as a starting block and getting that bored out. So if anyone has one for sale in non running OR running condition, I’m interested! Obviously cheaper the better!!

PatrickBateman

Any update here?

Optionman1

I've put 32k miles on a FSI 4.0 Stage 2 in my 997.2 4s and have zero complaints though I never drove the car, or any other 997.2, with it's original engine so I have no frame of reference on how significant the difference is.