maybe i'm just misinformed...but it seems like even with the general fuel upgrades like pump, injectors, safc, or an aftermarket ECU, the concensus is that 12-13psi is the max for the stock turbo? i guess thats with using the stock intercooler and ***** as well.

so why does a say a turbo DSM using a T25 run 14psi stock? their intercooler isn't really bigger...its stuffed under the wheel well. and if you throw on intake/exhaust it will prob be at 16psi. i know by that time its really running outta steam past 5500rpm...but if that turbo is smaller than the series 5 of the T2...why can it run more boost?

or is this question totally just related to fuel?

 

Its based on compressor, turbine, a/r all that stuff.

The main reason you cant do it with the seires4/5 turbos is the oil seals are crap and go out at about 14-15 psi. plus, the compressor simply doesnt have the CFM at that point and is just pumping hot air.

 

there is more too it then just pressure. you need to add volume. a rotary will pump way more volume of air so you need more going in.

 

its all about Cubic Feet Per Minute of air nothing to do with PSI

a 13B's turbo blowing 10psi would be flowing at a guess 30-40% more CFM than the DSM's turbo at 15psi

 

i agree with the last reply, if you put a T-25 on a RX-7 it probobly couldn't even make 10psi. also an RX-7 at 15psi is making much more power than a DSM at 15psi.

 

put the rx7 turbo onto the DSM and it'd probably happily blow 20PSI worth of air into it

 

Ya, that's like how those monstrosities of turbos T88 (big?) can flow massive CFM, get insane HP, and only be running 8-9PSI. One off the wall q. Does the series 5 manifold bolt up to any T3 turbo, or would it just be a waste when the T4 flows much much more?

 

You need to double the displacement of your rotary engine when comparing its flow rate to that of 4-stroke piston engines. I'm not really up on the DSM engines, but weren't the T25-equipped engines somewhere in the 1.8-2.0L range? If so, then that's only about 3/4 of your 13B's flow rate. Also, don't the DSM engines only boost to 10psi stock?

 

thanks for all the replys guys

yeah, the DSM motors were 2.0L i think...the 1st gens used a 14b turbo while the 2nd gens used the smaller T25. i'm not sure what boost the 1st gens ran, but i'm pretty sure the 95-99's ran at least 12psi stock. and that was with the crappy stock BOV. from what i gathered on the dsmforums, put an upgraded greddy one on and it will hold much better even up to 14psi stock.

 

a stock 1st gen DSM run 10 psi of boost which is double what a series 4 runs and it makes 195hp vs 186. so with half the boost the rotary makes nearly the same power. and if you're wondering all turbo DSMs are 2.0.

 

5psi boost with a larger turbo and you'll make 330 odd HP. your boost to hp 'relationship' only holds true with the factory turbo