opinions please NOS or Big turbo, what do you guys think Options

[zach]

Hey guys,
I was wondering what you guys think about running a big turbo, significant lag, or using a smaller fast spoolin with a healthy shot of n2o.


here is my situation, 1991 automatic talon tsi awd.
If I go with a big turbo, I will need a tall stall speed. but it will pull like mad.
or go with a small turbo and keep it friendlier for around town driving, and use lots of nitrous.

Or. use big ass turbo, and nitrous? in this case... should nitrous just be used for a launch and then cut off when it boost, I could use a more streetable stall this way.

or go for broke and use tall stall big turbo and nitrous all the way down the track?

Also, does anyone know what this engine will take, If I'm gonna run 29 psi, can I still shove a 200 shot down its throat, without blowing the head off the motor?

thanks,

zach

[KOU In3]

Well, I'm set up for nitrous but my car isn't even on the street yet so by no means should my input be taken as gospel. But here's what I have to offer you from my reasearch:

Personally, I think the best set-up would be to run a big turbo and only use the nitrous as a spool-up tool. You'd need a good quality wet-kit, a window switch, and the big turbo with supporting mods. But if this is a primarily street driven car you'd be driving around without ever hitting boost most of the time. It'll seem slow unless you were planning on running someone. In which case it would seriously haul. And it would probably be the most 'reliable' way to run both.

Not sure what your budget is and I hate to burst your bubble but I hope you have $10K to play with the way you're talking. You're definately going to need to build that auto tranny up to take the abuse. Complete internals and reworked head if you want 29 psi and a 200 shot. On a 4 cylinder turbo I'd keep it down to a 50shot personally or 100 if you plan on being crazy. Remember guys with big blocks and 8 cylinders are running 200 shots. We've got half the cylinders and 1/3 the displacement. I put the big price tag on it too because of all the supporting mods involved if you are stock now and all the parts that will break very quickly.

I personally don't think a small turbo and lots of nitrous is a cost effective solution. You could go all turbo for less and be faster than a 14B and a safe nitrous shot while still being less prone to going boom. What are your final goals for the project though? Easier to figure out how to build to a specific goal than to just wonder which is doable or 'better'

Oh, and personally I don't plan on using nitrous for the launch. Put in a trans brake and with that and AWD you should be able to launch with boost and pull 1.6's all day long. Ask Daryl about breaking a 4bolt rear with only a 50 shot off the launch. Nitrous is much easier on a drivetrain that's already in motion and revving a bit. Use it from a stop with no revs and things will break... fast.

In my case I'm just hoping to max out the stock engine and internals. I figure a well supported 20G and a 50 shot should be about all I'm willing to risk on a stock rebuild. But I'm a bit of a coward and will probably mainly use the nitrous to chill down my FMIC since I'll be too scared to go boom most of the time.

Well, that my longwinded $0.02 Hope it helps.