Single Turbo Choice: Street and AutoX Car

[Rotorypolo]

I am contemplating going BNR III's in seq. form and maybe a GT35R w/ .84 AR. Something that can achieve around 400-430 rwhp and still get decent spool. I am not sure if the BNR seq. will do the trick. Most I have seen people with BNR seq. get about 360-380 rwhp with 15 lbs?? To be honest, if I am gonna spend close to 3K to upgrade to BNRs (seq. of course) and get about the same hp as my stock twins can put out, I might as well get a set of used stock twins and call it the day...unless people can prove me the BNR's in seq. form can handle more in moderate boost level like 15-16 lbs on pump.

[hsitko]

Originally Posted by Rotorypolo

I am contemplating going BNR III's in seq. form and maybe a GT35R w/ .84 AR. Something that can achieve around 400-430 rwhp and still get decent spool. I am not sure if the BNR seq. will do the trick. Most I have seen people with BNR seq. get about 360-380 rwhp with 15 lbs?? To be honest, if I am gonna spend close to 3K to upgrade to BNRs (seq. of course) and get about the same hp as my stock twins can put out, I might as well get a set of used stock twins and call it the day...unless people can prove me the BNR's in seq. form can handle more in moderate boost level like 15-16 lbs on pump.

I'm not so sure about these things that you are talking about. I have a 35r with a mild streetport and all of the supporting mods necessary to make Great power. And i make 380whp on a brand new self sampling dynojet with 40c intake temps. On a dyno dynamics with 60c intake temps i made 360whp My friend chance with a freshly broken in large street port in great condition stock twins with all the necessary supporting mods made 317 whp at 14psi on the dyno dynamics which steve kan told us was one of the highest numbers he had ever seen on stock twins. Both of our setups were tuned by steve on a dyno dynamics. Where are you getting 380 on stock twins from? That is crazy. Those things turn just about useless past 14psi. The only thing they do past there is make a hotter air charge. I hit 15psi at about 3.8k in my car. Which is pretty damn spectacular. That puts me within 50lbf of my peak torque at 3.8k and only 1.4k away from it. It is way more than satisfying. That and it weigs less, is simpler and makes less heat than the stock twins. That and i dont have to worry about the in and out of transition of the sequential system (which in my opinion is the only way that the twins should be run).

Non sequential can be proven to be a bad idea with the reading of dyno charts. Nonsequential gains a minimal amount of hp on the top end and the losses in torque and spool on the low end make the car technically slower than one with a functioning sequential system. You cant argue those points. There is some info for you.

As for the 99 spec twins. They have something called an abradiable compressor housing. Which is actually just a plastic insert in the housing that the compressor wheel actually wears a groove into to increase the tolerances in the housing. The only benefit that has been reported by the 99 spec twins are a faster spool time and the obvious benefit of having brand new turbos. Otherwise the power increase comes from other modifications made to the rest of the power plant such as the efini y pipe and different engine management. Some of the internals of the 99 spec rotary engine are different as well. Namely the "bath tubs" on the rotors.

Picking your turbo with spool times in mind is a great idea. Just make sure you dont listen to people who tell you that 380 is a reliable number to make on stock twins. Its just not. Low 300's are the maximum safe area for the stock twins.

Any questions on my setup please feel free to pm me.

--Hank