New PRC 225 As-Cast heads result on SBE LS.
04-06-2013, 08:33 AM
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New PRC 225 As-Cast heads result on SBE LS. Well guys for those of you wandering how well the new PRC 225 As-Cast heads from Texas Speed will perform on a Stock Bottom end ls1, here are your results.
Car is a SBE LS1 with 52k miles. My previous setup was TSP TRQ2 cam with stock ls6 intake, stock ported TB and stock 853 heads. The car on a dynojet made 390rwhp. This was through a TH400, moser 9 with 375 gears and nitrous stall. The car was tune don 93 with ZERO knock.
New setup is same SBE with TSP TRQ2 cam, PRC 225 As-Cast heads, Ported Vic Jr, tad bit tighter nitrous stall, same th400 and rear setup. This was also done on a Mustang dyno fully loaded with the cars weight and coefficient of drag included. My friend that tuned it has tuned 10-12 cars on this dyno and has data to prove that it reads about 4-5% lower than a dynojet. I went with a 3% difference to stay on the conservative side. Car is now SD tuned on race gas due to the amount of Nitrous I will be spraying on it. Also tuned on #8 nitrous plugs.
We wound up with 28 degrees, made peak power at 6750 and laid down 457 rwhp and if you figure in the 3% which is 13 more was roughly 470 rwhp. I was really worried about my current cam being able to keep up but it looks like the combo is very closely matched.
My hat is off to TSP and the amount of R&D they put into their heads so the average guy can afford a quality piece and make excellent power!
Car is a SBE LS1 with 52k miles. My previous setup was TSP TRQ2 cam with stock ls6 intake, stock ported TB and stock 853 heads. The car on a dynojet made 390rwhp. This was through a TH400, moser 9 with 375 gears and nitrous stall. The car was tune don 93 with ZERO knock.
New setup is same SBE with TSP TRQ2 cam, PRC 225 As-Cast heads, Ported Vic Jr, tad bit tighter nitrous stall, same th400 and rear setup. This was also done on a Mustang dyno fully loaded with the cars weight and coefficient of drag included. My friend that tuned it has tuned 10-12 cars on this dyno and has data to prove that it reads about 4-5% lower than a dynojet. I went with a 3% difference to stay on the conservative side. Car is now SD tuned on race gas due to the amount of Nitrous I will be spraying on it. Also tuned on #8 nitrous plugs.
We wound up with 28 degrees, made peak power at 6750 and laid down 457 rwhp and if you figure in the 3% which is 13 more was roughly 470 rwhp. I was really worried about my current cam being able to keep up but it looks like the combo is very closely matched.
My hat is off to TSP and the amount of R&D they put into their heads so the average guy can afford a quality piece and make excellent power!
Last edited by Carter01; 04-06-2013 at 09:16 PM. Reason: video added
04-06-2013, 09:15 AM
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Thanks man! Didn't mill them, wanted to keep the tuning window as large as possible. As far as 8s go, well I'll just say this. I will push it as hard and as far as she will go!
04-07-2013, 08:08 PM
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Congrats man! I'm glad to see this. I was just literally looking at their heads on the tsp site and debating between the stage 1 243's or spending the extra loot on the as cast 225's for my LQ4 and spray. Looks like I will be ordering a pair of the as cast 225's tomorrow. I'm just worried that with the smaller combustion chamber it will bring the valves closer to my pistons and limit my cam choices.
04-08-2013, 07:47 AM
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Congrats man! I'm glad to see this. I was just literally looking at their heads on the tsp site and debating between the stage 1 243's or spending the extra loot on the as cast 225's for my LQ4 and spray. Looks like I will be ordering a pair of the as cast 225's tomorrow. I'm just worried that with the smaller combustion chamber it will bring the valves closer to my pistons and limit my cam choices.
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04-10-2013, 03:41 PM
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Thanks man, not sure about getting them without the bosses becasue mine has them but only 4 bolt. Call Aaron at TSP and he can answer everything for you, he has been a tremendous help for me.
04-10-2013, 09:02 PM
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Thanks, I will. I have to get with them about some other stuff also. When do you plan on getting some new track results? I know most of the good air is gone where you are at.
04-11-2013, 11:52 AM
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Impressive! Even with your drive line. That'd be pretty close to 500 with a 56/10 bolt setup, and still pretty close to 300ft/lb around 2500 with the Vic Jr. Why did you choose the Jr over the Super Vic?
04-11-2013, 06:36 PM
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I don't have any results to quote but based off my results I think they would shine.
Thanks man! Te Vic Jr I purchased was a package deal. It had been powder coated, ported and plumber with Nitro Dave spray bars.
04-13-2013, 10:26 AM
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after studying the boards for a month I decided to pick these prc 225 heads comboed with the ms4 on a 111..fast 102/102-fast 36lb- ftp lid-ls7 lifters trays-trunion kit..tchain..from john at tsp...setup now is pacesetter lts w/orp & magnaflows-tr224-ls6 intake portedtb-slp 85 maf-ud pulley-mti lid-performabuilt lvl2 w/4200 stall-3.73s....what is yalls take with this combo dyno/track #s ...old setup was done august 2002 by thunder racing..I have not been active on these boards for a good while...any opinions would be appreciated.
