Help me spend 18,000 on a car! - Page 3

R.W.240 · #31 10-17-2004, 07:40 PM

Alright...

Turbochargers work off pressure differential. so say you have 15psi of pressure in the exhaust manifold before the turbo and 10psi after the turbine in the down pipe. the exhuast gas will only be able to spin the turbo to say 90,000RPM (made up number) but if you were able to decrease the pressure in the downpipe (or raise it before the turbo) you would have a greater pressure differential. allowing the turbo to spin faster.

Apperently this works out on FCs to where the boost will rise to 11psi why the wastegate cant keep it down I dont know. maybe its too small? on STis this works out to them having boost creep issues from downpipes because the wastegate is only large enough to work if the flow from the wastegate is crashing back into the main flow stream - adding back pressure.

I know this also happens on Supras which is why a Downpipe for them adds 48HP and nessecitates a FCD.

yelnatsch517 · #32 10-17-2004, 08:00 PM

Why has no one mentioned the rb25det? That is the engine I plan on putting into my 95 240sx. It won't cost nearly 30k to get 300hp out of an rb25. If you do all the labor yourself, I'm sure you can get more than 300hp with 18k.

Car (pretty good condition) : $3000
Rb25det clip: $3500-4500

Depending on what you can salvage from the clip that leaves you with over $10,000.

Broke_as_**** · #33 10-17-2004, 09:07 PM

Quote:

Originally Posted by Pavlo

Spouting numbers

Hey maybe I will do some homework, like you know, actually weighing a car instead of searching around on the internet till you find some numbers that agree with what you want to believe.

Broke_as_****'s 95 300ZX Twin Turbo: 3286lbs with a full tank of gas.

NSX: ~3150lbs (coupe, T-top is ~100lbs less)
TT Supra: ~3450lbs
VR4: ~3800lbs

S13wanabe · #34 10-17-2004, 09:41 PM

R.W.240, Boost creep is caused by faulty turbo exhaust manifolds. Not a downpipe. I really think you need to research a little more, or actually do the work. If you have a boost controller fine, but a wastegate isn't going to change boost because of an exhaust or downpipe. I am 90% sure of this. But I will go ahead and do some research myself, and talk directly to an R&D and tuner from a very reputable company to make sure of myself. Sorry if I'm wrong, but I don't think I am.

Pavlo · #35 10-17-2004, 10:33 PM

I checked NSX not t-top, and agree that 300zx is a really nice car, i would take it over VR4 or supra (too many pimped out) NSX has no room for twin turbo setup even though i think you can do it, out of the big guys I think 300zx, 350z, skyline and silvia with rb are the best. If you want a 4 cyl i like the s14.
Ohh yeah and I did not search until i found the biggest number i just checked google and the first website i found, i recorded one of the LOWEST weights, the rest were 3500 or so.

FDTT · #36 10-18-2004, 02:45 AM

Hell, there all nice cars and htye all have alot of potnetial. Buy what you like, dont buy what others like.

Valakin · #37 10-18-2004, 10:17 AM

In all honesty the quickest and cheapest way to hit 300 would be with a 92 Eclise or Talon Turbo. Pick up the car for $2,500 and but 800 in parts and hit the 300hp. Thats with 3 fuel managment parts and a down pipe. That kinda leaves you with a whole lotta fucking room to work with other parts.

As far as the NSX twin turbo set up. You can find a quite little niffty vid here http://www.racingflix.com/getvideo.asp?v=863&p=5 ...

Further more I say lets end this... I don't think that kid is for real since he hasn't posted in a while lets just drop this. I know we all have good ideas but we as a whole generally don't agree well. Which I will never understand.

billclinton · #38 10-18-2004, 01:30 PM

300ZX twin turbo, exhaust, boost controller, bov, invest the rest

R.W.240 · #39 10-18-2004, 02:36 PM

Quote:

Originally Posted by S13wanabe

R.W.240, Boost creep is caused by faulty turbo exhaust manifolds. Not a downpipe. I really think you need to research a little more, or actually do the work. If you have a boost controller fine, but a wastegate isn't going to change boost because of an exhaust or downpipe. I am 90% sure of this. But I will go ahead and do some research myself, and talk directly to an R&D and tuner from a very reputable company to make sure of myself. Sorry if I'm wrong, but I don't think I am.

Boost creep is caused by the wastegate being to small. The STIs wastegate is only large enough to control boost if the exhaust gas is interupting the flow stream in the downpipe. hence why STIs with divorced downpipes need ported wastegates.

I dont want to come off as a a-hole but I know what im saying is right

mynismo · #40 10-18-2004, 06:22 PM

i was joking about the 30k... it looked like he was a honda body kit freak heh.

anyways.. my car is 2700lbs and 300hp.... 9hp/lb. yes its fast

Quote:

Originally Posted by R.W.240

Boost creep is caused by the wastegate being to small. The STIs wastegate is only large enough to control boost if the exhaust gas is interupting the flow stream in the downpipe. hence why STIs with divorced downpipes need ported wastegates.

I dont want to come off as a a-hole but I know what im saying is right

you're right.

240sxAddict · #41 10-18-2004, 10:45 PM

how about u spend that money on my car. i can really use that money.

lucki17 · #42 10-19-2004, 02:55 AM

i really dont see how it would take 18k to get 300hp to a 240. i bought my mine for $1,800, its a single cam and with a good turbo setup that is going to cost me around 3k i will be able to have 350hp easy, and it will be complitly drivable, so lets see im paying $4,800 for a 350hp car that handles awesome and is completly understated with a turbo. now i do also plan on coilovers and some other things to stiffen it up, but still, 18ks'? crazy.... how are you getting this money by the way, just out of curiousity.

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