13 psi on a 11:1 engine pump gas or e85????
01-24-2009, 02:13 PM
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13 psi on a 11:1 engine pump gas or e85???? I am thinking about turboing my car now after i have a n2o motor built.It is11.3:1 now with .040 head gaskets but if i ran a .060 gasket i could get it around10.8:1 and my heads have been ported and i really dont want to buy new heads. Im thinking a pt76 with a billet comp. wheel and run around 13psi and make around 700 to the wheels. Just wondering what you guys think about that high of compression. I figured with e85 i will probably need 84 pound injectors which are low impedence. Is there a driver to convert from low to high?? Or do you think i would be fine with 93 octane and a real safe tune???
01-24-2009, 02:37 PM
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go for it, but get 95's as the 84's will be pushing it as they will be maxed out (100% DC) at just under 1000hp on E85. That leaves very little room for error. I'm planning on doing the same thing with my 10:1 LQ9 motor but with twin 70's. I have 84's right now and doubt they'll be enough.
01-25-2009, 04:28 PM
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i'm running a megasquirt which can handle high or low imp injectors. Not sure who is good in your area but i'm sure someone can point you in the right direction.
01-25-2009, 05:12 PM
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Get some of these and forget the converter box. These are about 98lb high imp injectors on are 60 psi system and work with the factory pcm. You will need plug adapters.
http://www.fordracingparts.com/parts...KeyField=10702
http://www.fordracingparts.com/parts...KeyField=10702
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01-25-2009, 06:17 PM
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...never seen anything bigger than 60# unless they are modified. (which i would stay away from)
wow, seems they are high imp. do a search, i found one place selling them for $399
wow, seems they are high imp. do a search, i found one place selling them for $399
01-25-2009, 07:37 PM
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what motor do you have ? ls1 ? lq9 ? if you have an ls1 get lq9/lq4 heads and that will lower the cr to around 9.5:1 witch will be allot safer for the engine running on 13 psi. good luck
01-25-2009, 10:02 PM
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^^ you can get lq9 heads for 150 bucks. 11.1:1 CR is too high for an FI motor things a defiantly going to break quick unless you run it on race gas all the time. you can spend money on heads now or spend allot more money to rebuild your short block after it blows up. it's up to you.
01-26-2009, 02:48 PM
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^^ you can get lq9 heads for 150 bucks. 11.1:1 CR is too high for an FI motor things a defiantly going to break quick unless you run it on race gas all the time. you can spend money on heads now or spend allot more money to rebuild your short block after it blows up. it's up to you.
No 11.1:1 CR is not too high for a forced induction engine if you run the proper fuel. If you ran a fuel with high enough octane such as straight methanol, C or Q16, 11.1:1 CR with 13 lbs wouldn't be a problem. If you were to run say E85 (100-105 octane) and a meth kit there would be no problems with the compression ratio if you have a good tune.
Yes 11.1:1 CR is too high for a forced induction engine if you are planning on running pump fuels which as far as my experience have the highest rating of 94 octane. (E85 not included )
Arthur
Last edited by REGALIS; 01-26-2009 at 05:51 PM.
01-26-2009, 06:32 PM
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I think i may try to sell my heads and buy a set of 317 and that will put my comp. around 9.4:1. i want to be able to run pump gas. If i run pump gas i can prob get away with 60 pound injecter and they are high imp.
01-30-2009, 11:29 PM
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I remember back in the day when I could roll into a Sinclair gas station and pump a tank of 104 octane and the food at the A&W drivein was more expensive. OOPS. I'm giving away my age. lol
So I'm gathering it is possible to run significant boost levels with 10 or 11 to 1compression ratios. Is it then possible to fuel an 800hp supercharged engine with 42# injectors? There is a buildup in a High Performance LS1/LS6 engine book by Will Hanzel with a 408cid iron block, 9:1 comp, D1SC at 11.5psi. It topped out at 826hp, 781 torque ...548 at 3000 rpm. I have ALWAYS wondered how Wheel to Wheel managed to fuel this engine with 42# injectors! Can anyone shine some light on this?
I'm not trying to hijack the thread. I think the fuel enrichment issue in this type of forced induction build is the key to success with it.
So I'm gathering it is possible to run significant boost levels with 10 or 11 to 1compression ratios. Is it then possible to fuel an 800hp supercharged engine with 42# injectors? There is a buildup in a High Performance LS1/LS6 engine book by Will Hanzel with a 408cid iron block, 9:1 comp, D1SC at 11.5psi. It topped out at 826hp, 781 torque ...548 at 3000 rpm. I have ALWAYS wondered how Wheel to Wheel managed to fuel this engine with 42# injectors! Can anyone shine some light on this?
I'm not trying to hijack the thread. I think the fuel enrichment issue in this type of forced induction build is the key to success with it.
02-01-2009, 04:36 PM
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^^ you can get lq9 heads for 150 bucks. 11.1:1 CR is too high for an FI motor things a defiantly going to break quick unless you run it on race gas all the time. you can spend money on heads now or spend allot more money to rebuild your short block after it blows up. it's up to you.
02-01-2009, 09:06 PM
#19
Get some of these and forget the converter box. These are about 98lb high imp injectors on are 60 psi system and work with the factory pcm. You will need plug adapters.
http://www.fordracingparts.com/parts...KeyField=10702
http://www.fordracingparts.com/parts...KeyField=10702
