800 EFI limits

MattPark · **Posted:** Thu Oct 29, 2009 12:07 am

I haven't seen anyone running, or needing to run an aftermarket clutch on their 800.

Has nobody reached the limit? Is 60-70 horse the max you guys are running on these? Is that at the wheels or a guess at the crank?

I've seen the pictures of broken pistons. The broken ring lands look pretty typical of a detonation issue, not necessarily power output. Anyone running any timing control? What kind of total timing are you running at WOT? Is everyone just running premium fuel? (As opposed to race gas or E85, but seeing the lack of fuel control I don't see E85 as a feasible option just yet, at least on fuel injected models)

I bought Mike's (Gundog) LJ Tech 800. Drove it around in front of my house and decided I should probably turbo it before I take it to the dunes. Runs just fine, I just don't have a lot of fun in stock Rhinos/RZRs;) Hopefully it will be back together and maybe to the dyno by tomorrow afternoon.

TeamHog · **Posted:** Thu Oct 29, 2009 11:10 am

MattPark wrote:

I haven't seen anyone running, or needing to run an aftermarket clutch on their 800.

Has nobody reached the limit? Is 60-70 horse the max you guys are running on these? Is that at the wheels or a guess at the crank?

I've seen the pictures of broken pistons. The broken ring lands look pretty typical of a detonation issue, not necessarily power output. Anyone running any timing control? What kind of total timing are you running at WOT? Is everyone just running premium fuel? (As opposed to race gas or E85, but seeing the lack of fuel control I don't see E85 as a feasible option just yet, at least on fuel injected models)

I bought Mike's (Gundog) LJ Tech 800. Drove it around in front of my house and decided I should probably turbo it before I take it to the dunes. Runs just fine, I just don't have a lot of fun in stock Rhinos/RZRs;) Hopefully it will be back together and maybe to the dyno by tomorrow afternoon.

How could you NOT have a fun in a RZR?
There are so many mods that can be done to them..

MattPark · **Posted:** Thu Oct 29, 2009 1:48 pm

I did say stock;) They are all fun, but if I can double my power fairly easily, I don't see why not. I just don't know what roadblocks I might find trying to get this thing where I want it. If I've gotta be the first one to huff a rod out the side of the block, then so be it:)

pghruby · **Posted:** Thu Oct 29, 2009 2:16 pm

WEST COAST (a member on this forum) is down in OR and very good with the 800cc engines and turbos. I do not think he ever had trouble with a clutch, but he has blown out third gear in the transmission. Send him a PM or email and see what he can do for you.

list-trusted-dealers-t17576.html

MattPark · **Posted:** Thu Oct 29, 2009 3:57 pm

I'll get ahold of him. I don't really need anything, just information that may or may not exist. The third gear breakage is a perfect example. Was that on a stock clutch or an aftermarket ceramic disc? How and when did it break? The middle of a pull or right after shifting when the tranny wasn't loaded? Those are the types of questions I'm looking to have answered.

I was hoping this thread would eventually be a good source of information for everyone, pms don't spread information very well;)

WEST COAST · **Posted:** Fri Dec 04, 2009 1:04 am

I did break third gear in three tranys, one was a short hi rpm shift I probably shouldent have made but the other two were broke with hp and traction
( paddels ). One I broke riding with pbhruby at the dunes just goofing around.

The last dyno "6/09" on my 800 was 92.7 hp at the wheels, 8200 rpm.
110 fuel ,12 pounds boost ,30 deg timming @ 3000 rpm , Stock clutch.
Engine: .030 over 10:1 JE Forged aluminum pistons , Howard rods , All balanced.
All ARP head, rod, and main studs .
Cyl head: Gasket match port and polish, removed vacume ports in intake runners,
Stainless G10 valves with harden seats , Bronze guides ,
Comp sbc valve springs with 100 psi seat presure.
Chromolly rocker shafts.
Cam: HBR Racing ( ME ) .410 lift ,258 duration. 77* sep.
121.6 overlap.

Now for the pm's you will find plenty of people on here that are just waiting to jump on you for posting something "they" cant belive. It is much easier to talk to one person by pm and not deal with that stuff !! I havent posted on here for a while for just that reason . I sell a ton of parts to a great group of people that are having fun just like me making this Chinese oddball stuff go fast.

Pistons I have delt with had nothing to do with Detonation, infact most I have replaced were from stock older engines. The started using better material in eairly 07'. I have never lost a 07' or newer piston in a turbo engine.

W.C.

TeamHog · **Posted:** Fri Dec 04, 2009 10:45 pm

WEST COAST wrote:

I did break third gear in three tranys, one was a short hi rpm shift I probably shouldn't have made but the other two were broke with hp and traction
( paddels ). One I broke riding with pbhruby at the dunes just goofing around.

The last dyno "6/09" on my 800 was 92.7 hp at the wheels, 8200 rpm.
110 fuel ,12 pounds boost ,30 deg timming @ 3000 rpm , Stock clutch.
Engine: .030 over 10:1 JE Forged aluminum pistons , Howard rods , All balanced.
All ARP head, rod, and main studs .
Cyl head: Gasket match port and polish, removed vacuum ports in intake runners,
Stainless G10 valves with harden seats , Bronze guides ,
Comp sbc valve springs with 100 psi seat pressure.
Chromolly rocker shafts.
Cam: HBR Racing ( ME ) .410 lift ,258 duration. 77* sep.
121.6 overlap.

Now for the pm's you will find plenty of people on here that are just waiting to jump on you for posting something "they" cant believe. It is much easier to talk to one person by pm and not deal with that stuff !! I haven't posted on here for a while for just that reason . I sell a ton of parts to a great group of people that are having fun just like me making this Chinese oddball stuff go fast.

Pistons I have dealt with had nothing to do with Detonation, in fact most I have replaced were from stock older engines. The started using better material in early 07'. I have never lost a 07' or newer piston in a turbo engine.

W.C.

Great info. I wish I had the money to put a Turbo on my RZR. However, I have a lot of other mods to do before that.

Thanks again or the info.

Gocartacus · **Joined:** Wed Aug 29, 2007 1:24 pm **Posts:** 534

TeamHog wrote:

WEST COAST wrote:

I did break third gear in three tranys, one was a short hi rpm shift I probably shouldn't have made but the other two were broke with hp and traction
( paddels ). One I broke riding with pbhruby at the dunes just goofing around.

The last dyno "6/09" on my 800 was 92.7 hp at the wheels, 8200 rpm.
110 fuel ,12 pounds boost ,30 deg timming @ 3000 rpm , Stock clutch.
Engine: .030 over 10:1 JE Forged aluminum pistons , Howard rods , All balanced.
All ARP head, rod, and main studs .
Cyl head: Gasket match port and polish, removed vacuum ports in intake runners,
Stainless G10 valves with harden seats , Bronze guides ,
Comp sbc valve springs with 100 psi seat pressure.
Chromolly rocker shafts.
Cam: HBR Racing ( ME ) .410 lift ,258 duration. 77* sep.
121.6 overlap.

Now for the pm's you will find plenty of people on here that are just waiting to jump on you for posting something "they" cant believe. It is much easier to talk to one person by pm and not deal with that stuff !! I haven't posted on here for a while for just that reason . I sell a ton of parts to a great group of people that are having fun just like me making this Chinese oddball stuff go fast.

Pistons I have dealt with had nothing to do with Detonation, in fact most I have replaced were from stock older engines. The started using better material in early 07'. I have never lost a 07' or newer piston in a turbo engine.

W.C.

Great info. I wish I had the money to put a Turbo on my RZR. However, I have a lot of other mods to do before that.

Thanks again or the info.

Turbo would be sweet... :twisted:

MattPark · **Posted:** Tue Dec 15, 2009 3:21 am

Sorry for the delay in response. Work owns me. The buggy sits in the garage waiting for an intercooler setup.

I have a Garrett GT15 turbo on it now. I was hoping to reach 100whp (looks like you are almost there WC). It's original purpose was for a 700 Raptor, but for whatever reason, it's much too small for those single cylinder engines. The single cylinders demand a much larger turbo. Our Raptor now has a Mitsubishi Evo 3 16G (400ish hp on a gasoline 4 cylinder) putting out 110ish whp.

For fuel control I am using a Walbro 255HP inline pump, with a Vortech 12:1 FMU. That (ratio) will be fine tuned on the dyno obviously.

WC, is 30* timing what you hold through 8200 RPM?
Have you ever broken or bent a stock rod or rod bolt?
Are SBC valve springs a bolt in? (I don't doubt the chinese would use an American product for a second)
What chromolly rockers did you use?
I'll go to you for a cam;)

What, if any, kind of piston failures have you seen?

Thanks a bunch for the info.

WEST COAST · **Posted:** Tue Dec 15, 2009 11:04 am

Timming is set less than 30* at 3000 rpm. This is for the dyno run you will run closer to 20* normally otherwise it will heat up.
I have never seen a broken rod bolt other than breaking several on the bench to see how strong they were, after breaking them at like 65 psi I replace all mine with ARP bolts just to avoid the hastle. Also never had a problem with a stock rod , Howard offered some lighter and much stronger rods so I used them.
SBC springs are a bolt in item I can get for you with the cam , there like
30 bucks for the six springs.
I built my own rocker shafts after seeing some wear on the stock ones , they are very soft from the factory.
My high lift cams , good springs and the off set rocker arms put alot of force on the shafts. The stock shafts would probably last hundreds of hours but I was just avoiding another potential problem and going for max power.
Ring land failures on eairly model pistons are really the only problem I've had,
I went to the JE piston to tighten up the combustion chamber and get rid of the .400 of stock valve to piston clearance. I ended up with .050 clearance after moving the wrist pin hole down and thickening the top deck of the new pistons.

W.C.

800 EFI limits

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