to be honest with you i love this hybrid way better than the 62 i was running, the spoolup is way faster for one, ive notice a slight amount of lower egts, and i dont race my truck so i didnt the the 62, the hyrbid is way better for pulling heavy loads. you have the responsivness of the stocker 35 and the air of a hx40 theres no downfall to these turbos

 

If set up and wastegated properly, the 35 won't be spinning fast at all. That is the point of twins. Use the large turbo for volume, and the small turbo for spool up and to help get the larger turbo started spinning by drawing air across the compressor wheel. Once the large turbo lights, the small turbo should be wastegated to keep it moving at a nice slow speed, but still provide the exhaust flow into the bottom turbo. Turbo maps are all done in Pressure ratios, inlet pressure vs. discharge pressure, the volume is strictly reliant on the bottom turbo and what it can move at the turbine speed/PR that you are running at. The top turbo also runs at a relatively low PR keeping both turbos moving slowly thus increasing efficiency and extending turbo life as well.

What housing were you running on the 62, and what housing are you running on the hybrid? The 62 is capable of moving quite a bit more air than the hx40. the hx40 is only a 60mm comp wheel with an old and relatively inefficient design that doesn't push nearly as much air, and spools slower. We ran an hx40 with a 16cm WG housing and a 62/65/16wg on the same truck and the spool up was much better with the 62. Had the 62 had a 12 or 14cm housing it would have been better still.

Sean

 

Sorry to say that there is no way this would happen unless your buddy has alot more fuel than you.As Sean has already noted the 62mm S300 variant has a better compressor map than your HX35 hybrid and thus it will provide much better cooling.

 

It will only cool better when you get the turbo to light before it takes off the 62/71/14 will run hotter that the 35 hybrid. another thing to remember is the tc plays a big part in turbo choice.

 

62/71/13SS lights as quick as or quicker than a HX35/40 hybrid and it will cool alot more efficently than the HX35/40 hybrid.

 

he has the 14 not the 13ss ...

 

Well I haven't been on in a little while so Im just now getting back into this post. So a 62/71/12 or 14 would be ideal for a good single setup. Lenny at ddp said I would like a 62/14. Plus if I can get 450 Hp on a single and still keep my mileage thats probably the route I will go since money is an issue right now...

 

Then it sounds like a 62 would be perfect for you. I would stay away from 35/40 combo myself unless your trying to stay on the really cheap side of things.

 

if you only want 450 I would go with the 62/65/14 I ran one of these a while ago and loved it spooled very quick with good top end only thing is if you want to get your 550 your gonna want to go bigger ... couse its a great top charger for twins

 

you could build a custom hx35/40 hybrid with a 14cm housing over a htb3.5 and have a really big setup