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What's the most power someone has made on a pt61??



Not that I have anything useful to contribute, but I'm curious what the torque curve looked like on that dyno
 
c2978e136a9874150c5ffd1ee196d5ce0edb1319b45050df2292266d1830f295.jpg
 


L32, st5, custom intercooler, cartuning hot side with some midifications. TEP trans, gmr chain, aramet 100 IS, PI 3000 stall billet converter etc. 3 inch exhaust from the steering rack back.
 
yeah i know. i think that im going to make it though this race season how it is now. im pretty sure that im floating the valves beyond 6000 as power starts to fall off pretty hard. either going to go to some 150# springs or pac 130# springs shimmed to 140# seat pressure.

if i do though i need to pull the front cover and replace the double roller chain and have the crank gear machined properly...i never did that before.
 


I put in some crow cams 130's to go with the XP cam I have in, so I'm kind of in a quandary if I should change the cam and springs when I put the turbo on. it's not going to be a max effort build, I would probably be happy with 375.

When I put the double roller in mine, I was going to have the camfer machined to match the stock gear, and sent the double roller gear with a oem gear to a member on here, he took some measurements and the double roller gear matched the oem gear really close, so no machining was done. It's possible that at some point Rollmaster changed the specs to match the oem specs, the only real evidence I have of this is the measurements that were taken by the member on here.
 
i know mine is wrong becuase i measured the chamfer before i installed it. its out about 5 thousands. as to your build. i would not change the cam or the springs. it should make that kind of power on about 12-13 psi
 
I find it pretty funny that everyone says an XP cam is fine for a turbo, but when I emailed zzp last year about using an xp cam with a turbo, zoomer, the big dummy, said the xp cam was super laggy and made low hp with a turbo.
 
is it the best choice? no. however it is perfectly adequate for your goals and plenty of people have made over 400hp on conservative boost.
 
I just started a thread with the same question on a facebook turbo page, and got this response: Keith Bauer On a stock l36 other then 1.9 rockers and ls6 springs on a open torque converter 17.5 pounds I made 448 wheel. I'm not able
To close my torque converter but it makes a big difference to make a big number on dyno.

edit: added more info on facebook group.

https://www.facebook.com/groups/486639888019507/
 
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NebTurboST5 said:
what is the part number for the pac 150# springs? i thought they were the 1219's but pac lists that as a 135# spring
Click to expand...

1409x has a 175# rating at 1.8" install height. Zzp sells these as 150's.

On my comp g that T.J. has now, I put 150# Manley's on that intense sells. That is what prj recommended to me at the time.
 
GTPpower said:
1409x has a 175# rating at 1.8" install height. Zzp sells these as 150's.

On my comp g that T.J. has now, I put 150# Manley's on that intense sells. That is what prj recommended to me at the time.
Click to expand...

thats interesting. the 1409x is not listed as a LS spring on Pac's website.
 
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