DTR Pipe Numbers???
- Thread starter gmustangt
- Start date
Not gonna give up the numbers but looks like the bad fitting aaen is the best. He never had the y pipe for the dynoport setup but without the y-pipe it did almost identical to the slp pipe. But doesnt need a fuel controller. None of them made any huge gains though. Looks like 1000 bux for a couple horse.
Stock stock or stock with the shim made 150?
Renew your membership with DTR. He does a lot of work for us and provides some really good information on tuning and new sleds. It's not cool to post up his data that he spends countless hours putting together. I think it's OK to discuss it in general.
Whats this about shim?
Where does it get installed? Y-pipe? End of pipe? Can inlet?
Cost?
Manufacturer?
Safe at sea level?
Octane requirements?
Etc.
Where does it get installed? Y-pipe? End of pipe? Can inlet?
Cost?
Manufacturer?
Safe at sea level?
Octane requirements?
Etc.
It's amazing how much HP the stock Pro puts out with that shim kit and PCV!
R
racerjb
Well-known member
Ya, it looks like the shim kit, timing, and PCV with Jim's map seems to be the best bang for the buck. The timing looks to be a large factor also.
I thought I read somewhere that the Pro RMK's had different timing to the ProR's which was the sled they used for dynoing. Does anyone know if this is true or not.
The only thing I wish they had to test is one of 1200psi heads!
Also that Aaen pipe looks interesting with large mid range gains. However, you don't hear much of Aaen out west. It is pretty cool that all 4 pipe manufactures were fairly close in terms of power to each other.
I thought I read somewhere that the Pro RMK's had different timing to the ProR's which was the sled they used for dynoing. Does anyone know if this is true or not.
The only thing I wish they had to test is one of 1200psi heads!
Also that Aaen pipe looks interesting with large mid range gains. However, you don't hear much of Aaen out west. It is pretty cool that all 4 pipe manufactures were fairly close in terms of power to each other.
Last edited:
I agree with you, just looking for general info, not the details of his right up, and if gains were huge or minimal. Jim has done wonders for us Polaris 800
owners!
Thanks for the hard work Jim!
Whats this about shim?
Where does it get installed? Y-pipe? End of pipe? Can inlet?
Cost?
Manufacturer?
Safe at sea level?
Octane requirements?
Etc.
X2.
They were shimming under the cylinders then cutting the heads down to raise the exhaust port timing. No pipe with timing key and cylinder shim with jims map made good gains. Made all the pipes really shine. There was a couple pipes getting up in the 170 range with the shim kit, pcv and timing key. EWont say who or the exact numbers though. Renew your memberships guys.!!
Does anyone know if casey is gonna sell a kit for the shimming and timing key? Maybe a shaved head with a core or something? Or was he decking the block?
The guy that made the shim kit and brought the sled to dyno tech posted a thread on HCS and is looking to sell shim kits. and it NEEDED the timing to make the HP w shim.
the kit Really woke up this engine.
W/O dyno tech how would we find out half the little things that make a combo WORK.
the kit Really woke up this engine.
W/O dyno tech how would we find out half the little things that make a combo WORK.
^^^^^^^^^^^^^^^^^^^ Very True!
And for the guys that accuse Jim of being anything less than truthful need to remember this.
You don't see any other aftermarket companies out there working to discover this "lost" H.P.
It's $ 25.00 a year for the annual membership www.dynotechresearch.com
Guys, buy your dtr membership. In the article it explains everything. The jist of it is that the stock sled made decent power. The pipes all gained power but not huge. The shim kit gained big power with or without the pipe. Some pipes gained more with the shim kit than they did without it. Same goes for the timing key. In the end DTR and company have found all of the missing hp for the pro engine and it looks very reliable. If you want to know specifics you will have to subscribe to DTR. 9 yrs for me
G
gman086
Well-known member
Not discounting Jim's work or anything but just for the record; raising (shimming) the cylinders (which raises the port timing), shaving the head, and altering the timing curve is an age-old speed shop trick that has been no two-stroke secret for longer than most of you have been alive! The drawback to doing this is that you'll lose some low end torque but the pipes can gain that back by higher sonic reflectance as can advancing the timing at the beginning of the curve. This isn't something Jim discovered, he's simply putting up the numbers by going down that path (and good luck with your warranty if you decide to take that path!).
Have FUN!
G MAN
Have FUN!
G MAN
Last edited:
Guys, buy your dtr membership. In the article it explains everything. The jist of it is that the stock sled made decent power. The pipes all gained power but not huge. The shim kit gained big power with or without the pipe. Some pipes gained more with the shim kit than they did without it. Same goes for the timing key. In the end DTR and company have found all of the missing hp for the pro engine and it looks very reliable. If you want to know specifics you will have to subscribe to DTR. 9 yrs for me
Well shoot! I just posted farther back that I bought 5 years worth of subscription!
But the article STILL is not clear on that fuel issue, so if anyone knows anything or have tried the SLP pipe/can with no controller I'd like to hear about it. PM or whatever.
Thanks.
RS
D
dynotechjim
Well-known member
the SLP and other exhausts must have fuel added to make more HP! Yes you may install a pipe from SLP or others without adding fuel, but it will be lean and lazy and no deto but it will be 13/1 14/1 or leaner, maybe no deto there, and run OK, but you can't make more HP without more fuel.
