wow, demetrios' turbo look very peaky with lots of lag. compare that dyno graph with 100hp at 3500 rpm vs. the stock twins making 150+hp at 3500 rpm. i've seen a 35/40 doing much better than that at the low end.

thanks for the feedback.



well ill most likely be driving the car for everyday...... which means up to 15, and maybe pumping up the boost to 18-20 on the dyno or track.







would a TO4S produce more torque than TO4R? or would the S produce more torque at a lower rpm? would S reach 450hp faster than R?



im wanting the R cuz im thinking like a dynoqueen, and wating the S cuz i want drivability. im so confused https://www.nopistons.com/forums/pub...1047683561.gif

In all reality Martin, The difference is gonna be minimal either way.

Yeah, he is thinking WAY to hard about this.



I mean, if you really hate the turbo you choose, it isnt a huge deal to get another..

Exactly.



I promise you'll love the response from either turbo on the street at those levels.. You really wont notice the difference until you crank the boost and sit on a dyno and look at numbers. https://www.nopistons.com/forums/pub...#>/biggrin.png

get this one.... http://thepartstrader.com/SingleAd.cfm?Adn...D=101&C2ID=1004

LMAO.

TO4R 1.00



Final answer!

You are correct!!!! Now you with a turbo...... but you have to pay 2g's for it

Peaky? https://www.nopistons.com/forums/pub...1047683561.gif The R85 torque curve (15 psi dyno) is ruler-flat from 4250 to 7250 RPM and only then starts to drop off very slowly -- still above 300 lbs-ft at 8000 RPM. Now, that dyno was with an aftermarket intake manifold, but it seems like that would perk it up down low and make it drop off a bit faster at the top end (note that the dyno goes to 9300 RPM with a very fat power curve on the way up).



I chose a small turbo (RX6) the first time I went single. It has a fat midrange, but my torque peak of 300 ft-lbs was actually at 5250 RPM with that turbo, and the torque curve of the R85 kit passes (and then completely obliterates -- 340tq@4250! https://www.nopistons.com/forums/pub...IR) my RX6 torque curve at 3750 RPM at the same boost level. Now I want something bigger that won't choke my engine at the top end. When I had the twins, I usually tried to avoid the 4500 RPM turbo transition when driving casually on the street. After going single (or sequential) that limit disappears, and the importance of having lots of torque at 3000 RPM diminishes. I do care about turbo response down low, but I'm willing to give some of it up for a setup that will pull hard all the way to redline. The R85 kit seems like a good match for my goals (at a good price, with a rebuildable turbo), so I placed my order for one. I plan to use it with pump gas (~15 psi) on the street and for time trials / open track days.



I'll post some pump-gas (real street setup) dynos when my car is done.



-Max