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Engine size and type?
Transmission type?
Rear gear ratio?
Fuel type?
Intended use?
Packaging constraints?
Providing this info up front will get you lots of input.
The first Pantera TWIN Turbo I created was done FIFTY YEARS ago.
I was taught turbo sizing by Bob Keller.
The MOST important item is Camshaft Design, short duration and a CLOSE L/C.
I will help when more information is provided, Lance
Eric Roycroft is building me another engine, an iron 6l, punched and stroked to 403ci, ported ls3 heads, 4l80e, have a set of bnib 3.25(ford 9") gears, pumpgas 93 oct only ever, 27.5" tall et street R radial, enough room for twins, with 3" max in down pipes that will tie into a full 3.5" SS exhaust system(3.5" Borla xr1 are easily removable), I drive my car like I stole it. Some of you say you do, but I truly do. Id like to make 850-950rwhp. Id settle for 800rwhp if it meant noticeably quick spool time! Emphasis on quick/early spool if possible. I Anything less than 800rwhp, im not interested as I already have a killer pumpgas 800hp N/A set up in there now and its freakin awesome. Id like to throw the NA motor in another project. This chevelle is 100% streetcar. Its very heavy,(3800-4000ish guestimate) full interior, heat/ac, stereo system, holley dominator, small tire drag radial car, lotsa suspension work, etc. So far we are looking at Garret g35-900 turbos. I ll post pics of the A2W IC i ll likely be running, and the headers im working with. Going to run a hx upfront and a resevior with pump in trunk. I do not have room for A2A IC.
Sofar tuner and I are kicking back the idea of the Garret g35-900 turbos. There are alot of options with the turbine side. This is where I dont know what I dont know. Im open to other turbo suggestions, but they must have a mirror/reverse turbo option too.
I love that 65, that's actually what i'm looking for in my next project!
Anyway, i'm no pro like many on here are, but my combo is kinda similar. I'm just running a SBE 6.0 / 4l80 combo currently, so you have some cubes on me. I'm using BW S362 SX-E (62mm/68mm) with .88 housings and she made 982rwhp on 22lbs hot lapping it on the dyno in 95 degree heat lol. I would imagine your choice would work pretty well with what your goals are, but i'd be tempted to toss some 66mm units on their. Once again, i'm dumb compared to many on here, but this was just my setup and I have no data, but she lights off quick.
No e85 stations here. Theres one by Atco in NJ, Mighty Joes, but its over 40min from me. I drive my cars alot and often. So thats not gunna work. I wish we had more e85 stations here. It was just never a thing here.
I disagree that you have plenty of room for twins. The downpipe on the drivers side has to snake between the frame and steering stem, that is going to get tight in a hurry.
I'd do a single turbo on the passenger side and call it a day. Size it right and you won't have an issue lighting it off with that big motor.
I disagree that you have plenty of room for twins. The downpipe on the drivers side has to snake between the frame and steering stem, that is going to get tight in a hurry.
I'd do a single turbo on the passenger side and call it a day. Size it right and you won't have an issue lighting it off with that big motor.
Im going twins. I ve already test fit some 3.5" od pipe thru the exact area you re referencing. It fits. I ve seen tighter. But for good measure, this is why im limiting myself to a 3" down pipe. In the turbo world, I ve got a texas mile. I ll get it thru there. Likely without even building a pie cut super elbow. I dont wanna do a big single because of all the extra hotside fabwork it ll require. I ve mapped out a pretty decent build path sofar. Size of turbos will make or break me, but i ve got this. I think. Im somewhat mechanically inclined from doing hvac work for 20+ years. Prolly gunna build it all, tack it together, than bring it to fab shop to get welded up in proper. Going back n forth with Andrew and Reid, i think I mite give a couple of these turbos a try. What do ya s think?
04-01-2024, 05:03 PM
Pantera TWIN Turbo 1973 
