Currently i am running a .63a/r housing on my 60-1. Full boost comes on at 4800rpm on my internally stock gsr block. For my fully built 2.0 liter block, would it be beneficial to switch to a .82/ar exhaust housing. I know the top end would be greater, but how much more power will it net? I have only used .48a/r and .63a/r housings in all the turbo projects I have built, so i am not really sure if the .82a/r will be over kill. I want full boost before 5,000rpm, and all things being equal a 2.0 liter 9:1 comp with a fully built head should be able to flow enough to spool the .82a/r exhaust up similar to the 1.8 gsr block with a .63a/r.

 

i think the .82 will make more peak power but wont have a good power band
the .63 with will give you good power in most the rpm band

for drag racing i like the .63 if you can still make your hp goal with it

if you just want big whp #'s get a .82 you will put big #'s with it
But it may not match the 1/4miles times

i have seen a b18c1 made 301whp @12psi with the .63 and ran a 11.87 in a HB
and he up grade to a .82 and made 333whp @12psi but went back to the track and ran a 12.09 with more power but ran a slower 1/4mile time by having a bad power band

 

.63 with a stage 5 wheel work fine...

 

I would attribute this to driver inconsistency, not a difference in power band. It is true that more ower will only get you better times if you are using it, but drag racing is all at 6000+ rpms in a gsr, and the turbo would definitely be spooled by then. Track conditions vary and so do the times with them, two tenths of a second is not enough of a difference to look at that and say the other setup was faster. More than likely he wasn't used to the extra power and spun out of the gate, leading to a slower time.

If you are going all out drag, go big.

 

Well you answered your own question sort of! You will definately gain power from the .82 A/R more top end but sacrafice low end power. But you also stated you wanted full spool before 5000rpms, that ain't happening with the .82 A/R unless you increase your compression ratio or use some N2O or incrtease displacement. I have the .82 A/R and it made the power.

 

the HB had a stock 8000 revlimter he was running on a slicks 24-8-13's
he was still get 1.7 60foots with both turbine housing
just because he's still in boost and never drop under 6000rpms going through the gears don't mean nothing

1.if you have a guy peaking whp at 8000rpms making 333whp @8000rpms and making 250whp@7000 and 225@600rpms right

2.and you have another guy peaking whp at 8000@301whp and 285@7000rpms
270@6000rpms 225@5000rpms

so who going to be faster? #2 no matter what


A lot of you guys dont under stand that


[Modified by DLB1994, 9:56 PM 11/25/2002]

 

Average power in your respective powerband after each shift. I have a local V8 guy that's always asking what is your average horsepower #s and was that on pump gas! But the average #s do make sense and help explain diff in times between cars with the same hp and weight! DLB is so smart.

 

am talking about the same car with a .82 and a .63

are you telling me the #1 will be faster in the 1/4mile?




[Modified by DLB1994, 10:17 PM 11/25/2002]

 

No I didn't disagree with ou at all, I was agreeing that average power is more important than peak power. I didn't even make a comment who would be faster but My daddy is bigger than you daddy and he can beat him up!

 

If he is in full boost at the same amount of boost level and the car is tuned properly the .82 will be making more power on the same motor. I didn't argue that peak whp was the better, what I said was that in the situation where each turbo on the same motor is spooled the .82 will run a lower time. I stand by that argument. If both are fully spooled and at the same boost level, and everything else remains teh same, the .82 housing on the 60-1 will make more power than the .63 throughout the powerband.

If you are making more power and you still have traction/weigh the same/same track conditions/exact same launch you will run a lower time. I also stand by the fact that a two tenths of a difference is not nearly enough of a difference to be able to say for sure that going to the .82 hurt him. Are you?

 

I run the .82 w/ a stage 5 wheel. If you dont mind the lag the best way to put the power to the ground on the street is with a big back housing.With my hatch I am making over 500fwhp and getting it to the ground with the .82. If you like the track then the .63 is the better all around housing for e.t. If you are looking for mph then go with the .82. also if you are looking for a low e.t and high mph try the turbo/n20 setup on an .82.

 

I understand the trade offs between going with the .63a/r and .82a/r housings, but for a 2.0 liter gsr block with a fully built head would the .82a/r be spooled up as quick as the .63a/r? I have noticed that when i ran my b16a awhile ago it had a .48a/r housing and full boost hit at 3500rpm, when i stepped up to the 60-1/t3 .63a/r on that engine full boost was at 6000rpm. I put the 60-1/t3 .63a/r on my low compression 1.8 gsr block and full boost is at 4800rpm now. So i am figuring with a better flowing head and more displacement with the 2.0 liter block shouldnt i get full boost with the .82a/r about 4800~5000rpm?

 

sO MANY FACTORS, COMPRESSION RATIO, FLOW OF HEAD AND ,(oops caps locks)ALSo turbo manifold will determine the spool time and when you hit full boost. If you are going over 8000rpms or 8500rpms I would think the .82 A/R would benefit more where a .63 A/R may start to fall off, only way to check is dyno each respectably all factors being the same and just switching the turbine housings. TurbochargedSER will chime in soon he is a firm believer in the .82 A/R I may step up to a full T4 or full T Series turbo. HMMMM?

 

My redline is going to be 8500rpm, and as far as the head is concerned there is nothing else that i could have done besides rigging up itb's for maximum sort of what i am having done to the head currently. My manifold is a max-rev log style, and the compression ratio is 9.5:1. I am pretty sure that the .82a/r will be able to get spooled up by the 2.0 liter displacement. I just dont want a severely laggy car (full boost at 6000+rpms), and dont want to spend another 180.00 on the .82a/r housing for my 60-1 t3 if its not neccessary.

 

Matrix is right.. Alot of time Lag is one of the best ways to put power to the ground in a fwd car.