hi, i'm looking for ideas for a turbo upgrade on my 87TII. i'm looking to a T3 or T4 style turbo swap.

my main question is what turbo size will net me atleast 300+whp with close stock spooling charicteristics (anywere from 3500-4200rpm) achiving a max boost of 12-15psi. The more power with in that rpm range the better, i've heard a turbo like a .60 cold/ 1.0 or 1.15 hot works well and makes up to about 400hp.

this will prolly not happen untill after I rebuild the motor, but i want to get educated on it.

tell me what you think, thanks.

 

bnr hybrids can make that easy, try the stage 3 or 4.

 

What engine mods do you have? If it's a stock ported engine, a 1.00 or 1.15 a/r on the rear is to big IMO. You'll be waiting for the spool for a good 2 seconds

Look into a hybrid. The BNR stage 4 is AWESOME for keeping the stock exhaust manifold and the price.

I'd say a T3 style turbo wouldn't do to good on a rotary. Definitely go with a T4 if you don't want to go the hybrid route. I'd say a 60-1 would do good. A gt35r is ball bearing, so spool is real good with that as well just a little more on the pricier side.

 

i'm doing a atkins hybrid rebiuld with Mazda OE apex seals, the ports are going to be left stock.

I would rather go with a full on turbo swap then amp up my S4 unit.

so the 1.15 and 1.0 hot sides are too big?? what bout a .83 hot side?

is the .60 cold side still a good bet??

engine mods per sig, + fuel pump rewire and walbro 255 not 225. theres lots of other little things not worth metntioning.
acording to FC3Spro and relitave equvilants to there upgrading stages, i still need to get a CDI, then go to a bigger snail.

This car is also going to be a summer DD street and ocasinal track/strip car.

 

I'd personally go with this and a .84 A/R on the hotside if I were you. Check out the single turbo section, I'm sure you'll find plenty of good info on turbos there.

http://www.atpturbo.com/Merchant2/me...egory_Code=TBN

1.00 and 1.15 is to big for stock ports if you want good spool. I had a 1.15 on my stock S5 TII engine and it lagged REALLY bad.

I would like to try this, but I'm iffy on the T3 rear housings, but I don't doubt spool would be just about instant with that kit. Maybe someone with experience on that one could speak up.

http://cgi.ebay.com/ebaymotors/ws/eB...m=290258678144

 

it looks like according to fc3spro a to4b h-trim wouldnt be a bad option.

does a .60/.83 divied twin scroll look like a good idea?? it looks like a t4 hot side with V-band clamp.

 

57 trim To4E, if you have the money get a BB version and it will knock your socks off.
We build an FD with a journal bearing 57 trim with a 1.15 and it was in positive pressure at 1400rpms in 4th gear!

To get a nice responsive setup you have to pay a lot of attention to small details. Engine build, porting, exhaust size, tune, ignition etc etc..

 

Just as rotaryweapon mentioned, go with the BNR stage 3 or 4 turbo. Awesome power, bolt on, and a sleeper of a turbo. I'm planning on the same turbo myself, this winter.

http://www.bnrturbos.com/2ndGen.htm

 

wouldnt the to4e .57 be waaayyyy too small, even for a stock port motor?

hold on, i dont know if i have the ports i'm thinking about right, is this depending on intake ports, exhaust ports, or both?

again, not too into the BNR or the stock s4 hotside, but thanks.

 

Nope, I personally have done over 300rwhp on a 50 trim To4E, and that was on low boost. If setup correctly a 57 trim can do 400rwhp. You can go with a BB 61mm turbo and have close response also. Again though if you want great response etc, you can't use a crappy exhaust manifold, small exhaust system etc...

 

what do you mean by "BB", sorry if i'm a turbo noob

i'm making/having made a 3" straight pipe exhaust system.

i was definatly going to go to a tubular style manifold, this is higher flow, correct?

and by "low" boost, what do u mean? i want a max of 15psi, 12psi would be more desirable. (per first post)

 

I'm going to be running the FEED S203 Hi Flow Turbo , similar to BNR stage 4, its a 60-1 compressor. Once its installed i'll let you know how the powerband, spool is.

 

thanks, i would like to know when you get it done. I would hate having a car that didnt hit max boost till like 5k or 6k.

 

BB= Ball bearing. They spool a lot faster then a journal bearing turbo. 1Revvin7 knows his stuff. I'd definitely take into consideration the advice he gives.

 

My first turbo was a T04E "60"Trim, I dynoed it at 11psi and made 315rwhp..good turbo

 

if you've got the money, contact Aspec and they can build you a nice setup. With stock ports a good efficient manifold is important.

 

Contact the guys @ Turblown Engineering.

 

i would have to say go ball bearing also. i just got home from street tuning my GT35R and that thing is bananas! it picked up boost so quickly that it was hard to tune, it hit 1 bar in no time. it has a .84 hotside with an hks manifold on stock ports. with a boost controller i think boost will come on even sharper.

 

im only pushing 10psi out of my td06 20g and i have 300+whp