Does anyone have the CFM flow for the heads or have already matched turbos to calculate the the turbo efficiency with data from the compressor maps?

I used to have an excel sheet for the MKIV Supra, but it has been a long while since I looked at doing the calculations to match an ideal turbo to ensure that the flow remains as close to the efficiency island as possible. I can likely do the math again, but I need to know the CFM of the OEM heads. For the MKIV, I had the head ported and flow tested before I purchased the turbo. The T61 was the most efficient for the 2JZ at ~16#, IIRC.

I do not like the design of the current turbo systems and will likely look to fabricate my own over the next year or two, as I have time. I am working on collecting data and looking at designs for the exhaust/intake.

When I figure out the flow and optimally matched turbos, I will post the info in this thread.

 

Looks like I partially answered my own question. Found access to the Garret Boost Adviser and they do the calculations for you.

Input targets


Based on this, it looks like twin 53mm compressors are most ideal

Garrett GT3071R


Garrett GT3076R

 

I've been interested in this info being a MKIV owner as well. The Turbo kits I see available look like overkill to me with twin 64-76mm turbos claiming up to 2000hp. I was thinking twin turbos in the 58mm-62mm range would be ideal to fill the gap in power the C8 stingray has on the top end. But I could be wrong, until we see some boosted examples with real world data to work off of.

 

I agree. Throwing a bigger compressor on there is the mentality of most. If you look at the staged sizing of the OEM twin turbo system on the 2jz, you can understand that automotive engineers actually did their jobs to create a vehicle with decent power but minimal turbo lag. I had a T61 one my. Absolutely no low-end. I had buddies putting down 1000+ RWHP with T88, but that car was horrible to drive. The car would drag a turob 'Busa from a roll, but could not beat a Camry off the line (fact, he raced another buddy's Camry from a stop).

When I look at the turbo system for the HTC, I see several other ways the system could have been designed, not to mention the absurd pricing. The turbos (MRSP) are $3400/pair. I would also like to change the exhaust to a dual-tip center exist. There is zero need for 4 tips IMO (unless you have valved, which I do not, I removed it). A lot of what I see if form over function. That is a summary to keep from going into my laundry list of the turbo systems available for the C8.

An interesting thing to try would be to create some air inlets for a front-mount intercooler. I am curious to know if there is enough room in the under-body to run the piping back->front->back. Combine that with a properly matched turbo that stays within its efficiency range and the air intake temps would be a whole lot lower than they are with the current oversized housing systems available today. I am looking to add power but keep reliability and proper engineering in mind.

 

Yeah T88 is old tech, so many options out there that give better power and response across the entire power band.
or if there's enough room to have the piping run into the rear quarter panels and back to the engine. Similar to previous guns where they fit the turbos in the front fenders for a stealth look. Either way, I would be all in for a street turbo kit on this platform that's not starting at $28k!