im gonna run c16 and 6-10psi depending on what my engine builder likes. 
High compression with a turbo
Think of compression as a multiplier and boost as your base. The higher the multiplier the greater your compression is under high boost levels. The reason guys like to run low compression and high boost is it yeilds a lower effective compresion. Bottom line is the cylinder pressure it makes, you can make the same power with 2 different boost levels and 2 different compression ratios if it makes the same cylinder pressure. I like to run high compression for a couple reasons.... it makes spooling easier and you can make way more power when you throw the juice at it. For example....
8:1 and 30# of boost makes your effective compression 24:1
10.5:1 and 30# makes your effective compression 32:1
So your compression went up 2 points while your effective compression went up 8 points. But beware you better have an engine that can handle it. Our ECR is roughly around 40:1.
8:1 and 30# of boost makes your effective compression 24:1
10.5:1 and 30# makes your effective compression 32:1
So your compression went up 2 points while your effective compression went up 8 points. But beware you better have an engine that can handle it. Our ECR is roughly around 40:1.
Think of compression as a multiplier and boost as your base. The higher the multiplier the greater your compression is under high boost levels. The reason guys like to run low compression and high boost is it yeilds a lower effective compresion. Bottom line is the cylinder pressure it makes, you can make the same power with 2 different boost levels and 2 different compression ratios if it makes the same cylinder pressure. I like to run high compression for a couple reasons.... it makes spooling easier and you can make way more power when you throw the juice at it. For example....
8:1 and 30# of boost makes your effective compression 24:1
10.5:1 and 30# makes your effective compression 32:1
So your compression went up 2 points while your effective compression went up 8 points. But beware you better have an engine that can handle it. Our ECR is roughly around 40:1.
8:1 and 30# of boost makes your effective compression 24:1
10.5:1 and 30# makes your effective compression 32:1
So your compression went up 2 points while your effective compression went up 8 points. But beware you better have an engine that can handle it. Our ECR is roughly around 40:1.
LOL, we cant wait to try and run it out the back door again.... last year it went 199.86 on a pass where we pedaled it right at the 60' mark and put a cylinder out just before 1/8. Should go 210+ very easy.
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I am putting together a rearmount setup with the 13:1 motor in my sig, on E85 of course not trying to make big power jsut 650whp or so. Probably only get away with 5-7psi before I start pushing water since the heads are so thin
Teching In
Joined: Oct 2009
Posts: 18
Likes: 0
From: Baton Rouge, LA
I've got a camaro with a 370ci, lq4 block, mahle forged pistons, compstar h-beams, dart 205 heads with ARP headbolts, fast 90/90 running about 11.3:1 CR I'm planning on adding a t70 rear mount turbo and was wondering what a safe boost level would be. The motor made 440 at the tire at EPS. and i'm running a T56 with a 9" rear and 4.11 gears, mainly street driven, but more power could never hurt, lol!
Stud it:
SEXY
on stock block....what about pistons and rods? stock also? if you are keeping 10:1 compression and running on 93 octane I see no reason why you couldn't run ~14~16 degrees maximum timing and run 12~14psi (to be in the 2bar sensor range). You will want to keep the fuel mixture in the 11s keeping her safe
Registered User
Joined: Sep 2013
Posts: 1
Likes: 0
11.5:1 Ok fellas I know this is an old thread but this is what I want to do. The motor is 11.5:1 CR, I have JE custom nitrous pistons, stock rods with ARP rod botls, ARP main studs, ARP head studs, Thunder racing heads (Same as PRC stage 2.5) Thunder racing nitrous cam specs are close to 232/238, 42lb injectors, 255 pump and right now I am sendign a 150 shot to it and she loves it but I am wanting to go boost. I want to Build my own kit with a PTE 6262 on the rear and I was just curious if I could do this on pump. If not can I go E85 and make it work and work well. My power goal is right around 700. Please let me know what you guys think
Ok fellas I know this is an old thread but this is what I want to do. The motor is 11.5:1 CR, I have JE custom nitrous pistons, stock rods with ARP rod botls, ARP main studs, ARP head studs, Thunder racing heads (Same as PRC stage 2.5) Thunder racing nitrous cam specs are close to 232/238, 42lb injectors, 255 pump and right now I am sendign a 150 shot to it and she loves it but I am wanting to go boost. I want to Build my own kit with a PTE 6262 on the rear and I was just curious if I could do this on pump. If not can I go E85 and make it work and work well. My power goal is right around 700. Please let me know what you guys think
I've got a camaro with a 370ci, lq4 block, mahle forged pistons, compstar h-beams, dart 205 heads with ARP headbolts, fast 90/90 running about 11.3:1 CR I'm planning on adding a t70 rear mount turbo and was wondering what a safe boost level would be. The motor made 440 at the tire at EPS. and i'm running a T56 with a 9" rear and 4.11 gears, mainly street driven, but more power could never hurt, lol!
Teching In
Joined: Nov 2014
Posts: 2
Likes: 0
Im running a 12to1 compression BBC with tunnel ram in the picture i think i will show that on new guy,anyway i have a twin hybrid T3T4 turbos thinking about adding the turbo manifolds and tap into both carbs 1 for each with carb hat. I was told a high compression engine give u that good leave and the small 8lb turbos will spull faster than the large. the turbos have a built in blow offs and i have a couple of waiste gates, 1-5/8" headers shortfacing strait up i was going to wrap them for the heat. i running canfield heads big valves, 697 lft roller cam lifter all roller etc. any thoughts?