Ok, I have a 91 RS and it has just been rebuilt with new SRP forged pistons and eagle rods. Im shopping for a turbo hoping to be able to get in the range of 200-250 on around 7-10lbs of boost. Would i be able to reach these goals with a turbo that is a (Garrett T3 with 60 Trim .63 A/R Turbine and .60 Compressor) I want it to spool around 2k or 3k rpm’s and last to the stock redline. Should i look for a turbo with a lower compressor level? like .48, or will this do?
depends on alot of things, but i think it should spool around that range
if i were you i would go with a t3 .60/.48 and go with 8lbs with 2.25 inch charge pipes and a 2.5 inch down pipe…i have seen alot of people with ls engines with this similar setup and run around 210-240whp…i think that will suffice for you right? btw this is the setup im going with and a boost controller so i can up it to 10lbs on track days
Yeah, that .48 would be better to spool faster then the higher ratio right? Thats what i was thinking… just wasnt sure. thanks man.
thats the setup im going with and im looking to spool at around 3-3.5k still giving me plenty of time to play before i shift and start again
With the ratios, which one do you want to be smaller? the intake, or the exhaust?
im not an expert on this so this may be wrong…but thinking from a mathematical perspective the smaller it is the faster it will spin…and you want the turbine (exhaust side) to spin fast because it makes the compressor side spin fast…on the compressor side you want to suck in alot of air so you want bigger fins to suck in that air so you are gonna want a bigger ratio…but you have to find a happy medium between the 2 other wise it will either take forever to spool up or it will spool quickly and run out of breath before you run out of pedal…the t3 .60/.48 60 trim is well reccommended for an ls engine…thats what many people told me on homemadeturbo.com…hth
I’m not sure if this will make a big difference, but i am going to be using a 93 GSR tranny that has 94 GSR gears inside of it. Seeing how it is shorter gears, would that have an effect on how long the turbo has time to spool up? If the gear is not as long, would that mean that the turbo will have a better chance of keeping the air flowing and not lose its breath?
I guess what im gettin at, is the longer the gear, the longer the turbo has to push air out before the shift is made… correct? And since the gsr gears are shorter, the is less likelyhood of the turbo running out of breath? or is that unrelated?
P.S. - Is this the type of turbo you are talking about? I am looking for what you said, but cannot find it…
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7969949894&category=33742&sspagename=WDVW
or this-
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7969825694&category=33742
or-
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7969829024&category=33742
all of those turbos would work…thats exactly what i was talking about…as for the tranny im not sure about it but it doesnt effect how quickly you will spool rpms wise…time wise yes because you will be able to get to a given rpm quicker because of the shorter gears so i guess you would spool quicker but it would be at the same rpm just quicker timewise…hth
Dang, i just noticed all of those have internal wastegates, the manifold i got has the wastegate port on it. Crap… i cant find any without the waste gate, where did you go for your turbo? how much did u spend?>
i havent gotten a turbo yet because im not that far along in my build yet…what you can do is take off the wastegate and the arm and weld the flapper shut and then get a manifold and an external wastegate and voila you have what you are looking for…if i were you i would check ebay and homemadeturbo.com…just make sure you check into whatever you are getting and becareful for fakes…hth
ps.
for a new one i would spend 500 (garrett)
used no more than 200
used that has been rebuilt by someone reputable 350
sounds kinda small to make 250whp on ~8psi. a t3/t4e 57trim would make that kind of power. an LS with a smaller t3 on it would need 12psi or over to make 250whp. search H-T for info to back my statement.
I make 219.7whp and 205.4 ft/lbs of torque on a T3 @ 7psi. I think 250hp is well within your goals on a turbo like mine (T3 Super 60). IMO a T3 is an almost perfect match for a stock b18a/b. I wouldn’t look at anything bigger until you goals are over 300whp.
thats why i said it would go for around 210-240whp and thats well tuned…look at chunk…hes untuned on a 60 trim and hes kicking almost 220whp and thats at .5bar (7.35psi)
the t3 60 trim with the .63 exhaust is probably the smallest i would go on an ls. i ran the t3 60 trim with .48 exhaust on my sohc vtec and i should have gotten a bigger turbo.
right now i am running 7psi with a t3/t4 57 trim .63 exhaust on my stock ls. this is combined with a 98 gsr tranny. i hit 7 psi by roughly around 4500 (no boost controller, 3rd gear), and by 5k rpm you can feel it push you back in the seat pretty good. the uberdata map i am using made 225whp on 7psi, so im guessing im around there.
the gsr tranny is amazing on an ls motor. 4th gear begins to pull instantly as soon as you let the clutch out, and even not in boost, 5th gear has decent accelleration. the tranny generally runs about 700ish rpms higher than an ls tranny, which can allow you to get that much of a bigger turbo and not have to worry about lag. another good choice for your goals would be a t3/t4 50 trim with a .48 exhaust.
what kind of dyno did you make these #'s on? there are big differences between dyno brands. ie mustang, dynapak, etc. one could say 219whp and another could say 180whp. that just sounds REALLY high for a stock LS w/ t3 at 7 psi. there are people only making 310whp with a not-stock LS with a sc61 at 15+ lbs. sounds fishy. I have recently put a SSautocrap setup on a friends stock LS crx(HF). smaller t3/t4 at 8psi. estimated at 200whp. runs good, but would never keep with my heavy integra with a t3t4e 57 trim at 11 psi(stock b16 ~250whp). IMO I would NEVER run a t3 on any honda. a 50 trim t3t4e with a .48(hot) would spool fast and give you more HP than a t3. with a t3 you should spring for a 3bar map so you can run over 11 psi. if you go that route the t3 super 60 would be nice at 15+psi.
also at 219whp you stand the chace of getting beat by NA 200whp cars. If you just spent all the $$$$ to go turbo you still wanna get beat by basic high comp LS/vtec’s or b20/vtec’s? :tsk:
Thats why i would like it to be 250whp. I just dont know what would be best for the setup im running. The block is fully built but is not sleeved so i dont want to run too much boost on it and endup blowing the motor. Plus the stock valvetrain is another concern of mine. i am not upgrading it for a while. Im just trying to figure out with what i have now would get me to 250whp on this setup.
turbo is played out NA is best