858 rkt dyno hp

[briand]

Has anyone ever put a 858 rkt on a dyno to get some real hp numbers? I have a 858 rkt in my 14 swb assault and it doesn't seem as strong as my 11 swb assault with par head, porting,slp pipe, and longrod kit, that made 170 hp on D&Ds dyno.We are only at 1800 ft .We do lake racing and are always clutching and tuning.Just wanted some input from you guys out west because you guys are more familiar with these big bores and really put these motors to the test.

I had the RKtec dropin kit in my pro before i put the turbo on mine and I had the 13.1 domes in mine at 2500 ft. At about 2100 ft I had to add about 1 gallon of 108 race fuel to 9 gallon of 91 premium fuel to keep it from det. so you are definitely past the edge where your safe with 91 octane and 13.1 domes. Add 1 gallon of race fuel and things will run alot better and be far easier to tune. If you dont want to mix fuel then consider going to a 12.1 - 12.5 dome then you should be safe.

 

[shabs]

Way too much head for pump gas, switch to the low elev head they offer even then you might be on the edge of det with a patch of bad gas.

 

[2XM3]

As a side note we used to test fuel all the time from local stations, ive seen less than 88 octane from the 91 non eth pump somtimes