xssteeb's Fairlady 200ZR

[xsspeed]

Yeah turbo still, sorry didnt spell that out when i was talking about rpms and the n/a z31, though I think this would be the approach id have taken if i was in that n/a z31 dudes shoes

I haven't really dug into the rb20de neo head, as I pivoted pretty quickly - i couldn't find much on them so i was planning to CC the head at least as dont know what the combustion chamber volume is/i still can. I did compare intake ports a bit, will need to dig that out as they are similar to r33 spec rb25, but a touch smaller. Valves are a little different to rb20det too

I dumped some compressor maps in a thread a month or so back, i need to dig them out, there was a BW turbo map that looked not bad, i need to do some more work on what turbine housing A/R to choose though, and it will be a bit of a balance between response and able to flow at top end of rpm range

I think it will still be a bit suck it and see as even with all the selection advice its all going to come down to the combination of things working well together. At the end of the day i know just dropping an rb25det in would be easier and more power but this is a fun distraction from the real world for now

 

 

 

[Snoozin]

Nah nah nah no need for RB25, RB20 sounds so much better on the booiiiill.

[xsspeed]

Rb24 probably gunna sound like a 4gr or something shit

[xsspeed]

[Nominal]

Shots fired!

[xsspeed]

We'll make use of @Romans exhaust tuning services https://www.instagram.com/reel/DJGL_sJT1Rc/?igsh=MXV2ZGI2NzQ0M21rbw==

[Roman]

[scope creep trigger warning]

Have you considered going full retard, and using an RB30 block? 
Assuming the 30 block is taller "up" by the extra stroke length.
You would need a 9.65mm longer rod over standard RB20, if you use the 28mm compression height pistons.
End up with a 1.88 rod ratio instead of 1.8

I made this little script type thing in Fusion360 that will generate engine geometry when you type in all of the appropriate variables. 
I put in some numbers for a standard RB20 and a Steeb spec motor to see how some things like rod angle look before and after.
Then seasoned to taste with mspaint

[fletch]

30debt is +38mm deck height

[sheepers]

look, this all theoretical, lets be honest.   

 

[xsspeed]

Yep it is, will see how long I stick with it before it gets abandoned

I hadn't looked at 30s @Roman, I think I might have ruled out assuming the crank doesn't fit or something but a quick check says it does, down another rabbit hole I go I guess

 

Edit: Quick check was google AI which said the mains are the same but chatgpt says 62mm mains for rb30 which seems to correlate to other sources so think google AI picked up something awry 

So will scratch that off the theoretical list

Edit 2: if it were possible dave the RR would be 2.13