Galant VR4

[JET]

What is going to run the 2nd throttle body?

This seems to be one of those things that is plausible on paper, but doesn't work well in real life. What happens if you are at 4k RPM and stomp on the gas where the SC61 spools quick? Also at the same boost levels for each turbo you are going to need different tunes, since the T25 is putting out much hotter air.

[Goat Blower]

Watch for ring land squish when reusing stock pistons.

[iceminion]

Thanks for the criticism, I honestly appreciate it, no really, I want it, I hope to impress you all with my creation.

Yes, if I could have an RPM dependant acutator it might work out better.

The way I have this figured out is that the stock system is built for the SC61, the t25 is kind of the "parasite" system.

the parasite system will add to the stock system when it can (low RPMs) but since it relatively low CFM flow, I can use a one-way valve, (something like a PCV valve)

so if ever the SC61 side of the system outflows the T25 it will never backflow the parasite system, it will just close the "PCV" valve.

the second (pre) throttle body will be actuated by the boost level of the intercooler.

I hope this clears up some of the confustion created by the craziness of my idea.

Thanks

[iceminion]

Goat Blower, I dont understand what ring land squish means, but I assume that the rings will expand towards the end of their stroke due to the ovaling of the 100k miles on the stock bore.

if that is what you mean, I might just spend $100 on stock pistons that are .20 over, maybe it will blow up, who cares. I would rather bore it over and use new stock pistons.

remember my power goals are about 400awhp (whatever that means) which I have heard can be done on stock internals.

I WILL be building a forged motor eventually, but now is a time to have fun.

thanks, and I am gland that I am now 23 and I am totally drunk, my birthday is the 12th, you guys rock!

[JET]

I am not trying to discourage you, just trying to help you think things through so you don't run into any unexpected problems.

So the 2nd TB is going to be dependant on boost pressure, but what actually opens and closes it? Now that I think about it more, a simple flapper valve installed in a reverse Y might do the same thing and need no other mechanicals. Whichever side is flowing more is going to push the valve open more.

I can see quite a few pitfalls to this system and it will obviously not make the power it would without it on, because of all the restriction that will be added by valves, the extra turbo (with TINY exhaust side) and such. You would probably be better off to just go with a centrifigal supercharger or a 50 trim :D

[iceminion]

I was hoping on having a wastegate actuator open the TB, I know that there is only about an inch of travel from the wastegate, so it will be tricky to make the TB open all the way.

A Y pipe may work out a little better.

The tiny exhaust side of the T25 will only be in play under low boost, I will have a cutout in front of the T25 so under high boost/RPM all the air will bypass the T25 completely.

[scheides]

Any update on this twin-turbo setup?

[twack]

Wow i dont know how i missed this thread, sounds interesting. Seems like every once in awhile these threads pop up they try the system out for awhile either scrap it or are never to be heard from again

[AlexNGreen]

Alex, just go with the nitrous. The big turbo 2.4l ford guys run it for a few seconds and then turn it off. Do small jets just to get things hot you'll be fine. It'll be cheaper than all this extra turbo crap and it'll help save money for the stroker. Then you'll also have an extra nitrous kit around. So its Win Win .

[iceminion]

Well sorry to disappoint with the twin-turbo setup, but I am staying single turbo for now.

I drove the car last night, almost cooked the engine, I had the engine revving with no oil leaks so I took it for a spin, bad move.

the aftermarket oil pressure sender unit started leaking and I lost 2 qts of oil (nothing on dip stik, I added 4 and now I am 2 over, so its all good)

The GVR4 never had an oil pressure gauge stock, only the red warning light.
----------------------------

So here is the car now for power:
-2.3 stroker with mahle 9.5:1 pistons - Modern Automotive Performance
-BC280 cams with ti springs, rev limit currently at 8k,
-SC61
-DNP T3 Mani w/tial44
-chipped for 780cc

Other things:
-2wd/4wd switchable t-case
-TRE stege2 /welded diff/taller 5th
-Jet setup my intercooler pips a while back, still using them, might have to get a different BOV as I go 20+ psi
-Audi 5000 CS (5kqt) Radiator (24" x 12" x 2") this is a thick son-of-a-bitch that fits perfectly where the AC condenser used to be, I could go on and on about how superior this radiator is to the shitty DSM radiators that are on the market now,
-external oil cooler - Modern Automotive Performance
-adjustable cam gears! whoohoo! 1000+AWHP!!!!


So much for never hearing from me again. I sooooooooooo want to do the second turbo just to shove it in the nay-sayers faces! (good job guys for making me go 2.3, its just a whole lot easier then my crazy f-cking ideas)