How much Boost??

[gucciboy]

Thanks to everyone that has helped get me up to speed on turbos and the RX 1.
I would like to hear some opinions regarding boost @ sea level on a stock RX 1 running pump gas (91). How much can you safely run?
Also, does it make a difference with front mount or rear mount?

Thanks,
DC

 

[lakercr]

8 lbs - and yes, as it relates to boost, there is a difference between front and rear mounts and the amount of boost you can run.

 

[Mountaintech]

Have run 9 lbs. on a rear mount on 91 qctane @ 1000 to 8500 ft. no problems

 

[Mountaintech]

MCXpress Vector kits have arrived

PG Yamaha got their first shipment in, should make twenty odd people very happy!!!

 

[LazyBastard]

How about on 87? with and without low compression pistons. Just out of the principle, that extra $0.20/qt is something I would hate to pay.

 

[POWERHAULIC]

If you're going to sweat the cost of fuel you shouldn't have a turbo to start with

 

[LazyBastard]

Its the principle of the matter. Gas *should* be $15c/lt. I refuse to pay for the expensive gas because doing so justifies insane fuel prices.

And when you really add it up, every time you go to the gas pumps you drop $100 - $150 (truck + cans). Thats every WEEK. How long does it take for the fuel cost to exceed the cost of a whole sled + turbo? $15000 / $150 = 100 weeks. That means that in the time that I will own my sled, most of the total expense will be related to gas. Particularly since I DON'T HAVE a turbo.

 

[Buckeye]

8 lbs - and yes, as it relates to boost, there is a difference between front and rear mounts and the amount of boost you can run.

Isn't it more a question of the turbo & compressor size, rather than the location of the turbo?

 

[gucciboy]

I will assume then that you would need to make more initial boost @ the compressor to have the some manifold pressure as a front mount turbo, just because it has to pump air farther? not sure if distance changes pressure since 8lbs is 8lbs...
Maybe I'm over thinking this!!!

 

[lakercr]

A rear mount turbo starts out by always breathing the coldest air possible. Then, there is an aluminium charge tube under the tunnel that receives a constant wash of snow to help reduce charge temps. THEN the charge goes through an intercooler.

8lbs is not 8lbs in the turbo world – at least not when it comes to making power. Cooler charge temps mean denser air, which means more power, with less chance of detonation. 8lbs of boost at near ambient is quite a bit different than 8lbs at ambient + 100F.

 

[gucciboy]

Lakercr,

sent you a pm,

Gucci

 

[1xr]

Why does bender only recomend 4.5 lbs of boost on pump gas? Are they being ultra concervitive? I am hpoeing that I can run a couple of more pounds of boost on pump gas, But I ride at about 100 feet over sea level.

 

[spray25]

Bender is VERY conservative with their recomendations. Lot's of people have ran more boost safely.