Rxp-x supercharger on older rxp

[Boostedz06]

Just bought a used 2005 rxp, previous owner tells me for sure he put a new 2011 rxp-x blower on here less than 6 months ago. At the same time, perry performance did a new motor build for the ski. He has all the paperwork for the motor but not the blower.

Question is, if you put an rxp-x blower on here, does the ski need new injectors? I tried looking up the part number on the injectors but couldn't find anything.

Or am I mistaken? Can you just put this blower on an older rxp and the stock injectors are sufficient?

And apparently this upgrade takes the ski from 215 to 255hp?

The ski easily revs to 8000 and according to the speedo it tops out at 70 every time

 

[Dennis]

I would call Perry Performance Group.

 

[Boostedz06]

I would call Perry Performance Group.

No need, I actually spoke with them in person, including Glenn, on Saturday. They had a full record of building the new motor, but couldnt remember about the supercharger. And the guy I bought it from says he got the supercharger separate from another dealer, but that FOR SURE he swears on his life it is a rxp-x blower.

 

[red2blue]

My understanding is the largest wheel you can safely run with stock injectors and a stock IC on a 215 is the old S3 wheel.

The X wheel should require 42# injectors....your air fuel ratio at wot is important...run rich and you just foul your plugs a bit sooner...run lean....BOOM.

lemme check around.

General consensus has 42's with the Xwheel and front housing as a typical bolt on mod.

Now, some are listing 50#'rs with their set up...I believe that's in part due to an external IC and or reflashed ecu needing the bigger injectors for the mapping.

Ever thought of a RRFPR?...the only real way your gonna guarantee your afr is correct throughout your rpm range.

 

[Carguy89]

My understanding is the largest wheel you can safely run with stock injectors and a stock IC on a 215 is the old S3 wheel.

The X wheel should require 42# injectors....your air fuel ratio at wot is important...run rich and you just foul your plugs a bit sooner...run lean....BOOM.

lemme check around.

General consensus has 42's with the Xwheel and front housing as a typical bolt on mod.

Now, some are listing 50#'rs with their set up...I believe that's in part due to an external IC and or reflashed ecu needing the bigger injectors for the mapping.

Ever thought of a RRFPR?...the only real way your gonna guarantee your afr is correct throughout your rpm range.

50s are only for a much different s/c wheel than stock on an X Charger. Even a wheel like an ET137 on the X, you can get by with 42s and an RRFPR.

 

[JFizzleJR]

If the ski has a stock air intake and stock intercooler the stock injectors will be fine for the X charger. The charger upgrade by itself does not make up the 40 HP difference between the RXP and RXP-X. The charger plus the external intercooler and ECU map, among other things, are the items that make up a large part of the 40 HP difference.

 

[Boostedz06]

Okay I went ahead and removed the supercharger and took it to Perry performance and they verified it is an X charger. I also took them the injectors and they are going to have them flow tested. They told me I would need 42# to handle the X charger.

You mentioned intercooler...I dont see any intercooler on this ski....it goes right out of the supercharger and into the throttle body. But the ski says on it that it is intercooled....am I missing something? So with just the X charger on my otherwise stock ski, will it be making more boost?

Like I said, Perry told me I would just need 42# injectors and that there is no ecu re-map needed for just putting an X charger on a stock rxp. Is this right?

 

[red2blue]

Okay I went ahead and removed the supercharger and took it to Perry performance and they verified it is an X charger. I also took them the injectors and they are going to have them flow tested. They told me I would need 42# to handle the X charger.

You mentioned intercooler...I dont see any intercooler on this ski....it goes right out of the supercharger and into the throttle body. But the ski says on it that it is intercooled....am I missing something? So with just the X charger on my otherwise stock ski, will it be making more boost?

Like I said, Perry told me I would just need 42# injectors and that there is no ecu re-map needed for just putting an X charger on a stock rxp. Is this right?

No ecu re-map required for those bolt ons.

An '05's oem IC is located in the manifold behind the TB. If you go to the front of the motor on the startboard side...in line with the TB you will see a coupla hoses going into a copper...end cap sorta thingy....that is where your cooling water enters and exits your IC.

When the time comes to upgrade again....talk to Fizzle about his ex ic mod. It'll be my next mod along w/ 42's.

 

[JFizzleJR]

I suggest asking PPG if they've datalogged the X charger with a 215 model stock intercooler, stock ecu, stock air intake, and stock 38# injectors. My guess is no. Save yourself the $200 until you actually need the 42s.

 

[Boostedz06]

I suggest asking PPG if they've datalogged the X charger with a 215 model stock intercooler, stock ecu, stock air intake, and stock 38# injectors. My guess is no. Save yourself the $200 until you actually need the 42s.

Hmmm, well last week they called me with the flow test results of the injectors I had on there and said they are 38's and that I will need 42's. So I went ahead and said okay and I cant believe how much they are, $300 for 3 injectors!??! I get a set of 8 for my Z06 for $300. He also said that is cost. I am also suspicious of the need for these injectors, but I'd rather be safe than sorry. I would love to hook my wideband up to this thing with the 38's but with a wet exhaust im not too sure how that would work out. How do you check AFR on these things?

 

[JFizzleJR]

The more you tell us the more I feel bad about your dealings with them.

First off, are your injectors the OEM 185/215 injectors? (thin pencil type with a black stem and orange ring near the bottom?) If so, I don't believe they flow tested your injectors. And if they did, it was relatively pointless as it's well-known what flow rate the stock Seadoo injectors have.

Second, if you decide to go with their advice, I will get you the injectors and it will be about 1/2 the price. $300 is not their cost unless they are buying them from Riva first to sell to you. Or maybe they're made out of gold/silver/platinum/diamonds. Which would make them a nice gift for the wife for the holiday season :lols:

Third, hoooking up your wideband is no problem. There are hundreds of people I know that have done this. There's two main ways. One is to drill and tap your exhaust manifold for the sensor. The other is to weld a bung into your J-pipe. I feel the manifold option is cleaner/quicker/cheaper option. The J-pipe option is the easier one though and doesn't require as much precision. With the manifold drill & tap you have to be very careful not to hit the water jacket. Drill as far away from the hose barb as possible, while keeping the hole 100% on the small flat section right next to the barb. Location is important on the J-pipe option but it requires no where near the precision that the exhaust drill & tap does.

Feel free to send me an email if I can be of assistance in any way.

Hmmm, well last week they called me with the flow test results of the injectors I had on there and said they are 38's and that I will need 42's. So I went ahead and said okay and I cant believe how much they are, $300 for 3 injectors!??! I get a set of 8 for my Z06 for $300. He also said that is cost. I am also suspicious of the need for these injectors, but I'd rather be safe than sorry. I would love to hook my wideband up to this thing with the 38's but with a wet exhaust im not too sure how that would work out. How do you check AFR on these things?

 

[Boostedz06]

The more you tell us the more I feel bad about your dealings with them.

First off, are your injectors the OEM 185/215 injectors? (thin pencil type with a black stem and orange ring near the bottom?) If so, I don't believe they flow tested your injectors. And if they did, it was relatively pointless as it's well-known what flow rate the stock Seadoo injectors have.

Second, if you decide to go with their advice, I will get you the injectors and it will be about 1/2 the price. $300 is not their cost unless they are buying them from Riva first to sell to you. Or maybe they're made out of gold/silver/platinum/diamonds. Which would make them a nice gift for the wife for the holiday season :lols:

Third, hoooking up your wideband is no problem. There are hundreds of people I know that have done this. There's two main ways. One is to drill and tap your exhaust manifold for the sensor. The other is to weld a bung into your J-pipe. I feel the manifold option is cleaner/quicker/cheaper option. The J-pipe option is the easier one though and doesn't require as much precision. With the manifold drill & tap you have to be very careful not to hit the water jacket. Drill as far away from the hose barb as possible, while keeping the hole 100% on the small flat section right next to the barb. Location is important on the J-pipe option but it requires no where near the precision that the exhaust drill & tap does.

Feel free to send me an email if I can be of assistance in any way.

Great INFO!