Isayimandrew's Twin Turbo Build

redondoaveb · 04-21-2022, 12:04 AM

Quote:

Originally Posted by Hotrodz

Stock block 750 plus and built motor 800 plus. There is a reason Seb only tunes to 700whp regardless of stock or built. The key is torque. Now you can dial the tq down to around around 500 tq at 700whp. When I was on a stock block w/stage 1 turbos I was at 600whp and 559tq. That said the smaller turbos spool much faster and the tq comes on fast.

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Hey Bob, I was talking about boost and head lift. Mine's making over 700 and probably around 530ft.lbs. but as you know, we went with the larger turbos so they spool slower and the torque doesn't hit so hard. That's at 15psi. 15 psi shouldn't have headlift issues and the OP wants to stay in the 600-650 range.

My point being. My car made 745 at a little less than 16 psi before we backed it off because stock block. The OP is using the Stage 1 turbos and won't be seeing 16 psi so I don't see him having any concern with headlift as Elmo was pointing out. He needs a stronger bottom end with those smaller turbos which he has.

My car could easily hit 800whp at less than 17 psi. If 17 psi isn't in headlift territory then I'd just build the bottom end too.

That's the reason I was asking what the threshold psi number is for headlift on the stock top end

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