http://www.yellowbullet.com/forum/sh....php?t=1332810

http://www.yellowbullet.com/forum/sh...d.php?t=554336

http://www.yellowbullet.com/forum/sh...d.php?t=622336

http://www.yellowbullet.com/forum/sh...d.php?t=617625

This uses a pair of AGP BW 261mm units.

http://www.camaro5.com/forums/showthread.php?t=283673

GT35's are a similar size range, smaller turbine AFAIK.

http://www.camaro5.com/forums/showthread.php?t=423938

 

Something is wrong with the motor only making 850hp on twin 6266s. I've personally seen 6266s make 1250 I'm corn at less than 25lbs boost in a mustang dyno.

I've seen 6466s make 1400 And some change on corn on less than 30lbs on a 400" plus LS.

I've seen 6766s make 1600plus on corn on 400" plus LS.

850 is pathetic unless on pump gas, then that is respectable. But your boost numbers don't sound like pump to me.

 

That kinda performance on less than 30 lbs is impressive to me. Some serious motor development there.
You are talking wheel hp figures right? Thru what trans

 

so its pathetic? its on pump and meth, runs the most efficient on like 18lbs, and seriously please stop... the ******* 6466's are rated at 900crank hp each.... so your telling me on a 400+ inch LS theyre gunna make 1400 qnd change? just because a supra or evo runs 40psi... doesnt mean a 400inch LS can. these are just crazy #'s to me, especially onna mustang dyno!! i personally know another firebird twin 76's on a 432inch LS runnin 35 psi makin around 1550 wheel...... so how is a 64 or even 67mm baby *** turbine gunna make 35lbs of boost on a big motor let alone make alotta power?
maybe im wrong and ima look into it more, if those numbers are real, maybe i needa move to wherever yall are at to make impressive #'s cus thats crazy good power on baby turbos.

 

Look around here, 850 sounds pretty low on that combo man

 

Another classic thread.

 

182 mph trap speed @ 3250 lbs, with 62mm compressors and stock heads.


This just ***** on, well, everyone!!! LOL F'in A.

 

I don't even know how to respond to this. Stevieturbo posted a ton of info with a lot of patience. Maybe he has more in him. Lol

Look more into it man, size ain't everything. That seems to be the premise of your argument.

 

A few Gen5 cars, you can research the specific members for their builds.

Whilst I'm sceptical about some of the big numbers with the small sub 60mm turbos, one way or another they have obviously got those dyno sheets. But as I dont do dyno's....I dont really care. Clearly they're happy with their combo.
Whether the numbers are real or not who knows, but clearly those cars that have backed up the results with either 1/4, 1/2 or mile trap speeds would be more believable vs just dyno results.

http://www.camaro5.com/forums/showthread.php?t=208952

67's

https://ls1tech.com/forums/forced-in...build-2-a.html

67's again

https://ls1tech.com/forums/forced-in...pump-meth.html

62's

https://ls1tech.com/forums/dynamomet...0hp-month.html

top of page 64's on a 434 albeit with 175shot

http://www.camaro5.com/forums/showth...208952&page=15

Nobody's saying bigger turbos wont make power more easily, but there will usually be a sacrifice in terms of boost thresholds and response by going bigger ( not always though )

If the car was say a standing mile car looking to push big numbers on the smaller turbos, I could envisage more concerns as spinning smaller units very hard for a long time generally isnt good. But it's picking the right turbo for your specific goals.

For a manual trans 408ci 1000hp car there is enough evidence that a pair of turbos with impellers in the low 60mm range is quite adequate. You could even push it to a high 50mm with the right units for better spool.

Just because your friend used 76mm turbos means little. I'm sure a cheap *** chinese 76mm cast turbo would still be below par compared to a modern billet wheel 64mm turbo. Yes the smaller unit will be spinning faster and probably working harder...but it can get the job done, and it will spool a damn sight faster.

hell, just look at some of the turbos fitted to modern engines, either gas or diesel. they are the tiniest units you'll ever see yet they're pushing 2, 300hp in some cases. These tiny units spool very well but can still cope at the top end.

 

Agreed.

 

What is your dads combo?

 

Borg warner 177283 look into at of these.they make billet wheels also.