well, if ExViTermini plan to build the motor and raise the rev limit to 9K then i m sure the HP61 will shine!

 

Man I dunno, I think you should have kept the 50trim without a doubt. Gobs more torque and much faster spool. You hardly gained any more power. A higher redline and built block would def be nice but IMO, the torque and spool of the 50trim is just light years ahead. But to each his own!

 

I would still be on the 50trim if a bearing hadn't went out in it 3 weeks after I put it on.

I decided to go ahead with this turbo because I'm going to end up building the engine, and didn't want to have to buy two turbo's.

 

Interesting results Ben, right now I'm contemplating getting a spare motor and building it to a 2.3L thru TT/AMS/Buschur....

my ultimate goal is to go with a 35R/37R and call it a day...

we shall see...

but overall Curt Brown's build inspires me....

 

what was the turbine a/r on the 50-trim?

 

its most likely a .63 a/r

 

250whp at 5000rpm is weak. Very laggy turbo.

 

Congrats!!Need to update you on 500whp stock block club.Will you go to drag strip??Scorke,this is a drag turbo,just forget about the lag.

 

Question for you... why are you so concerned about torque? The laggier the turbo, the less tq it will make but when running a 61mm on 20 psi compared to 20psi on a 50 trim, the 61 will easily make more power and be faster regardless of the torque difference.

KOEvo: The 67 doesn't only make 10-20whp more than a 61/35R. The compressor flows a good 10lb/min(100hp capability) more than a 61/35R compressor wheel. On high boost is where you'll see the difference when you get well into the 30s.

ExViTermini: IMO, you could've made similar power on a .63 exhaust housing and had a little better spoolup. Good numbers though, it should haul.

 

My first run with this turbo it had a .63 Turbonetics housing. The spool actually wasn't any better and the power was down about 30whp. TTR got me this Garret .82 housing and it seems to be doing fine.

I'm still unsure which I would prefer, the 50 trim or the 61. Which do you think would make for a faster car? I think the 50 trim hands down would be wayy more fun with stock block, but I dunno which would be faster.

 

The 61 will make more power and be faster hands down. The compressor flows 65 lb/min compared to the 50 trim's 49 lb/min. I've had 50 trims, 61s and 67s on my cars. Bigger = laggier = more top end power = faster; in most normal cases. Go big or go home!

About the exhuast housing sizing, seems like there might've been something else wrong with it if it spooled like this witha .63 housing. To be honest, it seems kinda really laggy for the turbo. A .63a/r 50 trim should spool about 1000rpms before this.

 

what about just upgrading the 50 Trims .63 a/r backside to a .82 a/r backside....???

Its like getting slightly more top-end w/o sacrificing too much spool..correct me if I'm mistaken

 

I would easily expect the 50 trim to spool at minimum 1k rpms sooner, of course. But this turbo is wayy bigger....

The .63 housing I had was a Turbonetics pos....thats where we believe the power was and such. Either way I still dunno what I want, I might just sell the car, lol.

 

Whoa, sorry. I'm at work and got all confused and thought the difference was between a 50 trim w/ a .63 and a .82 a/r for some reason. Nevermind that comment. That looks about right for a 61mm with a .82 housing on it. You gonna try a good .63 housing again to see if you can gain back a good 3-500rpms of spoolup and sacrifice like 10 hp? -Just turn the boost up.

 

If your concerned about HP you should be concerned about TQ as they are directly related, the sooner you make your HP the more TQ you make, the more TQ you make the earlier you are making peak power, simple as that.

And your wrong, I would put money(lots of it) on a 50trim at 20psi being an assload faster than a 61mm at 20 psi, being that power numbers would be very close but tq numbers would be wayyyyyyyyyy stacked in the 50 trims favor. Now if both turbos were at 30 psi the 50 trim would still probably be making more tq, but the 61 will make about another 150 whp.

Scorke