going super/turbo charged next year. need imput

[blurred vision]

boost

A stage two also has a bigger intercooler. For a little more bigger cooler better belt and pulleys, and can run up to 14 psi with no fuel mods on race fuel. We installed a blow off valve and have a valve that I can open or close and change my boost by 5psi without changing pulleys. It dumps the extra pressure out side the sled, works great. When I figure out how to post pics I will.

 

[Yakuza]

blurred vision, will your mpg drop from stage 1 to stage 2? Thanks

 

[HAMMER]

Yakuza -- Horsepower = Fuel ... (if your making hp it's taking fuel)

motohd66 -- I run a Stage-I SC with a 50-shot of nitrous ... quick is more important than fast to me (mountain rider) ... so I'm very happy !!!

DYNOTECH ... one example of SUPER vs TURBO

Approximate CFM, Efficiency, and Pressure Ratio
MPI Stage-I 310 CFM (@ 65%) (1.8 PR)
CPR modified GT25? 405 CFM (@ 60%) (2.0 PR)
Both SC & TC runs in the 10s for Air Fuel Ratio

11lbs --- MPI SC --- CPR TC

6700 --- 127.9 ------ 129.5
7200 --- 144.9 ------ 147.4
7700 --- 159.4 ------ 165.3
8200 --- 170.7 ------ 175.7
8700 --- 185.4 ------ 191.6
9200 --- 201.8 ------ 214.1
9700 --- 218.7 ------ 234.6
10,100 --------------- 246.7
10,700 - 241.7 --------------

>>>>>> Thread: http://www.ty4stroke.com/viewtopic.php?t=49808 <<<<<<

>>>>>> Thread: http://www.ty4stroke.com/viewtopic.php?t=46755 <<<<<<

 

[Yakuza]

Thanks Hammer! Hope your feeling better.

 

[tko47]

my stage 1 RX-1 at 10psi wasn't so bad on fuel about 10, but stage 2 on the Apex 14psi is more like 7 or 8 mpg so 20 to 30% more fuel....

 

[polarisconvert]

Ouch.7-8, not so good. HP cost money, that is all there is to it.I bet it is fun to ride!
Bruce

 

[REXX]

I second what speed says. I am his son. I wish I did a S/C for the fun factor, but the turbo in a race can't be beat. For trails go with the S/C. Stage 1 will whoop anything but another boosted sled and will scare the Sh*t out of you on the trail.
Just My 2 cents

aj

Re: Instant acceleration wakeup call. I have blisters and calouses on my hands from holding onto my turbo.

Up to 10 or 12 lbs. boost the power on trails is manageable; beyond that you had better hold on, because things happen very quickly. I normally ride in 2-3 feet of snow, and the added boost (16lbs.) is an absolute, incredible blast!
Every now and then I take a trail and the temptation to rocket off a rise is too great and I squeeze WOT. With a 162 x 16" track, the traction is absolute, the acceleration is instant and the pain of being slammed into the trail at 60mph is immense. Some part of your body hits first(ie. shoulder, or ribs...), followed by your helmet (head)...yes,everytime...I'm too stupid to have only done this once (4x since Feb 7th).
As a second note, the sled takes 3-400 yards to roll to a stop...unless it is bashing through trees. Humans have more drag and only take about half the distance to stop....so far my sleds have only ended up in the bush so I'm not sure how many trees I would bash through before coming to a stop.

This is huge power!
Respect what you build.

REXX
-------------------------------------------------------------------------
'07 STOCK...312 hp MCXWISECOYAMAHA Apex mtn SE turbo;
....well okay, I've added a few things to increase handling and performance;
....but it's still red.

 

[motohd66]

one more question for you guys. what tracks are you guys using? i will assume you cant put all that power through an 1.25 track, as i have had stud issues just with my nitrous on that track.

 

[motohd66]

anybody??

 

[mbarryracing]

No issues with 270+ Hp thru the stock Ripsaw, studded. But everyone rides in different conditions, too.
There is no one single answer to your question. almost as bad as which type of boosting is best...

 

[mmax700]

Running camoplast 1,75 track on my MPI Nytro dual head schim. works excellent, just have to remove stud protectors first...

 

[TBird]

I see that you put in an extra gasket, how is that working out for you?
Was it for safety measure (bad gas) or do you want to run more boost / more power?

 

[BlgsRX-1mtn]

For a basic idea of what 5 lbs of boost from a MPI Stage 1 SC will get you on premium gasoline; check out this video. This is my '03 RX-1 mtn with a 162" Challenger with 2" paddles @ 5 lbs boost 91 octane pump fuel, stock mountain gears and the clutches were loaded up for running 10 lbs using MPI's starting point.

This is on a lake @ 8700' elevation while dialing in my jeting. The losing sled was an '05 800 summit rev with clutching and a can with a rider that weighs about 180 with riding gear while I weigh 270 with riding gear. Your should see higher speeds with the smaller track, proper clutching for the boost and lower elevations.

I just leave the primary loaded for 10 lbs and live with the lower rpms if I have to switch the pullies when I can't get race fuel.

Here's the video; http://media.putfile.com/rx-sc-vs-800sum

Jim

 

[mmax700]

I see that you put in an extra gasket, how is that working out for you?
Was it for safety measure (bad gas) or do you want to run more boost / more power?

for safety measure and for more boost, only thing is that the guy that installed my SC tells me that he actually cant feel the difference in 5 or 8 lbs boost other on the dynochart....comments on that?

Been to Kittelfjäll anytime TBird? they dont got any 98 octane, only 95...

 

[TBird]

I see that you put in an extra gasket, how is that working out for you?
Was it for safety measure (bad gas) or do you want to run more boost / more power?

for safety measure and for more boost, only thing is that the guy that installed my SC tells me that he actually cant feel the difference in 5 or 8 lbs boost other on the dynochart....comments on that?

Been to Kittelfjäll anytime TBird? they dont got any 98 octane, only 95...

No, i don't been there, but i know that many smaller gasstations don't have anything other then 95RON / 87MON :-(