Im aware that im beating a dead horse with this High compression & Boost topic. Ive read countless threads on here of guys offering input, but who's actually running a combo like this? let me first start off by saying this is a Strip/ Street ordeal. it will NEVER see any fuel other than E85/E98. 427ci Six bolt based LSX block, Callies CCW 4" Ultra Billet crankshaft, Callies Ultra billet rods. Ill be running Twin T4 Borg Warner 80/87 ETR HO V2 covered turbos.... I figure if im going to go all out and build a motor, I might aswell try to get the most out of it... so am I out of my element if Im wanting to run 12:1 compression on like 20+ pounds of boost? im trying to build a very torquey setup. lastly, Im running MS3pro for my ECU and ill have a very good reputable tuner behind the laptop, we'll be logging EGTs throught CAN and doing individual cylinder tuning aswell..
Matte_blacK
No help but, I am building a similar combo currently. 427" LSx with a single LF, planning around 11.5-12 to 1 CR. Will be a e85 street/M1 track. My engine builder sees no concern with that as in "street trim" won't be running much boost. If was gonna be all out track deal would be different story with much more compression.
Just know the tuning window will be much more critical the higher the boost vs. fuel capabilites. Personally will be curious to see how much power/boost the e85 will be capable of!
Just know the tuning window will be much more critical the higher the boost vs. fuel capabilites. Personally will be curious to see how much power/boost the e85 will be capable of!
I just dont see the point. You have big cubes and i have not seen a big cube lsx not make torque for a street strip deal. At that comp and e85, all you are doing imo is narrowing the tuning window for a tiny bit of power increase. The increased comp is just extra heat in the chamber
Theres plenty of 10-11:1 e85 cars making fantastic numbers and more than enough snappy response on the street. If the heads and intake are working properly a 20 psi 400 cube e85 turbo car could be in the 1200-1300 whp range with not an outrageous cam.
Pushing high comp just doesnt seem worth it, i am not sure the gains, if any, are worth the risk of a smaller tuning window
Just my two cents. It would probably work out and run with proper cam events, with alot of attention to the tune work.
Theres plenty of 10-11:1 e85 cars making fantastic numbers and more than enough snappy response on the street. If the heads and intake are working properly a 20 psi 400 cube e85 turbo car could be in the 1200-1300 whp range with not an outrageous cam.
Pushing high comp just doesnt seem worth it, i am not sure the gains, if any, are worth the risk of a smaller tuning window
Just my two cents. It would probably work out and run with proper cam events, with alot of attention to the tune work.
Is the car setup to handle 1400+hp at lowish rpm? Why would you need that on a street/strip car? How would you even manage that " torquey" power coming in at a low rpm? You'll have to run a bunch or power reducing electronics and/or traction control for it to even be usable.
Yep, I have a couple NA cars that are difficult to drive on the street. The strongest of the two is about 700cshp. Traction control is definitely a big plus. I will say this about the LS, they are tough to keep the heads sealed up and rpm is your friend. Peak torque is always made at highest cylinder pressure which also happens to be where any engine is most likely to encounter detonation. Trying to go easy on the engine with low rpm/moderate/high boost has broken many cranks and bent a lot of rods.
My twin turbo eBay gt45 copy turbo ls2 4.125 bore 4.00 stroke had so much torque and throttle response on the street over 1100 whp, 9.8:1 compression, e85, no need for 12.1 Unless you're running a 285 @ .050 cam.
I pulled the trigger on one of these 417 Motorsports 2000hp Intercoolers last week.. gonna run a stock hood and just let it all hang out!
curious to see how the intercooler performs, I have a rule 3700 inside a 12 gallon Ice tank. finally got both turbos mocked up. not bad for being driveway built lol
curious to see how the intercooler performs, I have a rule 3700 inside a 12 gallon Ice tank. finally got both turbos mocked up. not bad for being driveway built lol
I'm sure there's a boat out there somewhere that can really use the bilge pump. What you need for an intercooler pump is a WP150 Davies Craig pump with minimum 1.25" feed and return lines with minimal 90* fittings and bends.
I'm at 10.8:1 with a 23° SBC and air to water I/C. Personally I think 12:1 is a little high, i would target the 10:1 range if i was building your combo.
I have a dart lsnext 4.125×3.850 stroke. 9.7 to1 on e85. Gt5533 91mm turbo. At slow boost ramp in for 2.5 sec then 30psi boost. 3500lb car with 3.25 gears an already went 5.0@142 and 7.8@173. I have a large tuning window and it spools fast. I have been running high boost from 7to1 to 10to1. I feel 9.5to10to one will be more than snappy with that combo naturaly asperated and way more forgiving under boost. Also i run that intercooler. I added sensors all over and it is NOT WORKING ENOUGH FOR ME!!!!! I left it on, and I had Derek at modern speed add 8 more injectors above the origional inj and at a 90 degree angle. It mists allitle into the floor of the intake. Holy shit now i see 140 degrees at the end of a 30psi 1/4 pass. Soo if it sees 140 there, im sure it is way lower because it has time to travel down the whole intake runner like a carburetor
I read this write up last night.. pretty interesting article, all parts and cam specs remained the same other than the compression. results were quite ASTOUNDING. not an LS motor but still, the principle is what counts..
http://www.mustangandfords.com/how-to/engine/mmfs-070022-ford-compression-ratio/
http://www.mustangandfords.com/how-to/engine/mmfs-070022-ford-compression-ratio/
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