homie

Hi everyone. I'm trying to keep my baby drivable and fun, but I NEED to make more power to beat some Supra ***. I definitely want to keep a twin set-up (sequential) but I think I've got to get 450-500rwhp to beat those 700rwhp pistons. What do y'all say? Can I do it? How? I still got stock turbo and motor, but I'm open to anything. I'm even thinking about a 20b! Thanks.

rynberg

Cannot be done with sequential twins. Even non-sequential BNR Stage 3s look to be topping out in the 400-420 rwhp range. To be in the 450-500 rwhp range, you will need a good sized single turbo.

If you want the car to be "drivable" and "fun", why worry about "beating some Supra ***"? If you want to maintain the good low-end and throttle response of the sequential set-up, you will be limited to the under 400 rwhp range.

BTW, a proper 20B conversion will cost over $25k. Probably over $30k.

At that point, I would just drop in a modded LS-1.....

homie

Rynberg, thanks for the reply. That's not good news. I'm not too knowledgable on this, but how come putting in two bigger turbos can't get me up to 450-500? I'm at 330 now with a stock motor/turbo and still got my cat. I'm curious and would like to hear more. Thanks!

fastcarfreak

do you have a dyno slip to show 330rwhp or are you just guessing? what boost your running at?

rynberg

Sure, you can put two bigger turbos in (like the A-spec kit at the rx7store), but you can't run them sequentially unless you spend a truckload of $$$$ to custom-make a set that will work that way. And then you have to contend with that transition. People already have transition issues with 340 rwhp, how much more of an issue will it be at 450 rwhp?

In summary, there's no free lunch.

homie

Fastcarfreak, I'm running 1 bar and I have the dyno sheets. It was dyno'ed in southern cali and with what I have, I think the motors in good shape. Any recommendations? Thanks.

homie

I just read on a thread some guy has 400rwhp on a stock turbo set up! Can this be real ???

mob

i wouldnt do wut ur planin man my oppinoin spendin all that cash just so u can beat some supras i wouldnt do some upgrade with 330hp thats pretty good i would just stick with that

kwikrx7

Sorry, but what you are asking is impossible with sequential. The most I've seen any dyno slip of anyone running sequential is in the 380s rwhp at 15-17 psi and this is on upgraded twins. The M2 turbos have dynoed at 381 sequential (artguy) and the BNR 3s have pulled down 412 (non-seq) but this isn't exactly poopy - the 412 was enough to run 125 traps. The 400 rwhp on stock twins was Boostn7 and he is an amazing tuner - it's really all in the tuning - but you won't see 450-500 rwhp out of twins

911GT2

You can put in two bigger turbos, but think of the options (not even going to mention cost). Putting in two bigger turbos will give you a slower spool up time than stock, but with higher output. It will require custom fabrication of turbo manifold, dp, and intake, and pipe/s to intercooler. Then you'll need an ECU to control it, and fuel injectors/pump to get it enough fuel.

You can buy a single kit good for all of this (minus ECU and fuel), that will hit full boost somewhere under 4k rpms, which is probably the same area you'd be looking at with a bigger primary as in larger twins.

Long story short, you'd be taking the road less travelled, to achieve the same end. Talk to the single turbo guys, ask them when they get full boost. I guarantee many of them are seeing 15psi by about 3700 rpm. And that would be more than drivable, fun, and capable of whoopin some ***.

homie

mob, kwikrx7 and 911GT2, thanks for your feedback! So you really think going single is the way? I'm concerned the boost will come in too hard and my rear end will break loose. Something about the original concept of seq. twins just doesn't want to go away. What is BNR 3s? Are the figures you gave me with a midpipe upgrade? I still have some room to increase hp by removing my midpipe and upping the boost to 17psi.