New BW EFR Turbo Thread
#1696
Seriously, thanks for that.
Oh yeah, it looks like the 74mm efr turbine wheel is 87 trim which I think comes out to about 69mm for the turbine wheel exducer. The trim info is in the BW EFR "Technical Training Guide" pdf.
Last edited by Talonboost; Mar 31, 2012 at 10:58 PM.
#1699
fyi - 2 indycar races completed so far - all 2012+ Indycars use a 100% off-the-shelf EFR rotating assembly, the same exact turbine and compressor wheels / shaft / bearings that every aftermarket customer will receive. The wheels are literally 9180 and 6758s. The only difference is indycars weld the twinscroll housing to their headers, so there is a different inlet. for the twin turbo chevrolet and lotus engines, they get an external WG t25 housing for the 6758s (this is so teams can not cheat and raise the boost). same center sections however. some photos:
you can see the penske dampers and the twin EFR 6758, stock center section complete with internal wastegate mounting holes in these 2 photos:
chevy twin turbo:
Lotus twin turbo here:
Honda is running the single twinscroll turbo:
note: honda is the only team using "header bags" to contain the heat. chevy and lotus just use raw or coated tubular fabricated headers.
note2: these cars use E98 and low boost so do not require an intercooler
you can see the penske dampers and the twin EFR 6758, stock center section complete with internal wastegate mounting holes in these 2 photos:
chevy twin turbo:
Lotus twin turbo here:
Honda is running the single twinscroll turbo:
note: honda is the only team using "header bags" to contain the heat. chevy and lotus just use raw or coated tubular fabricated headers.
note2: these cars use E98 and low boost so do not require an intercooler
#1700
This is false.
I have a 9.8 housing chopped up and the volute area where it first meets the scroll is in fact very close to 9.8cm^2 between the pair of runners. The A/R of a Housing ONLY counts the flow area and the divider IS NOT part of that area counted.
If you want to compare powerbands between single scroll and twin scroll. Multiply the divided housing by 0.6 and you have the roughly equivalent open scroll housing AS FAR AS OVERALL POWERBAND. This is strictly based on some SAE papers I've come across addressing this exact issue.
Thus, a 1.06 A/R T4 divided housing will have a similar overall power band as a 0.64 A/R T4 open scroll housing.
I have a 9.8 housing chopped up and the volute area where it first meets the scroll is in fact very close to 9.8cm^2 between the pair of runners. The A/R of a Housing ONLY counts the flow area and the divider IS NOT part of that area counted.
If you want to compare powerbands between single scroll and twin scroll. Multiply the divided housing by 0.6 and you have the roughly equivalent open scroll housing AS FAR AS OVERALL POWERBAND. This is strictly based on some SAE papers I've come across addressing this exact issue.
Thus, a 1.06 A/R T4 divided housing will have a similar overall power band as a 0.64 A/R T4 open scroll housing.
#1703
I was thinking the same thing... interesting how the pro teams don't seem to have a shortage, but most of the commercial customers who have already paid for their turbos over a year ago still don't have them.
#1704
cant wait for you to get it on track, the setup will blow your mind
rockauto.com has a few for like $70+ shipping. if anyone wants to order one, just order for a 2000 mirage 1.8L. i need to sell my mishimoto now, its a nice piece, but just plain too thick for this setup. i want plenty of room around everything as ill be running stock motor mounts and im sure it will dance all over. i dont need a dump tube or coupler rubbing into the radiator and leaving me stranded or chasing leaks.
#1705
I cant say how the mirage radiator will work for certain. Its full width, but its a single 5/8" thick core. Stock is double the capacity. Go buy one and test it out, if it works for you in az, were all good!
#1706
i could be wrong. but guys using 1/2 sized rads are not ''as big'' as a full size rad. maybe it is double instead of single. my thought is the single rad has double the surface are then the 1/2 sized rads. i bet they hold nearly the same amount of fluid. so IMO it should work fine. but i could be wrong.
#1707
i could be wrong. but guys using 1/2 sized rads are not ''as big'' as a full size rad. maybe it is double instead of single. my thought is the single rad has double the surface are then the 1/2 sized rads. i bet they hold nearly the same amount of fluid. so IMO it should work fine. but i could be wrong.
#1708
i am a victim of that every day haha. but its a good thought. i dont think it will cool as well as a stock rad but it will cool better then the 1/2 rads used. so its in the middle. or maybe its in the trash. who knows