s2k manic

so I built an air to air intercooler setup for my novi 1200. The pulley sizes are 4'' blower pulley 6.75 crank pulley the intercooler is an 840hp treadstone with built in diffusers with 3'' piping dual bovs and all the boots are in straight areas no silicone 90 degree bends they are aluminum. the bov where a pair of tial Q50MM hot side has a 6 psi spring the cold side had a QRJ spring of 1.5 psi and this setup made 18 psi 450 whp 300tq. so recently I took off the hardtop and the dual bov's where so loud I decided to try the QRJ recirculation valve. I got the other day went ahead and installed it with the 1.5 psi spring. so started it up drove around and its much quitter. then I decided to see how it affected power right off I knew something was different as I was seeing 6 psi at 4100rpm so I slowed down and nailed it in 2nd and saw 21 psi at 8500 rpm decided I saw wrong second pull blew an intake pipe.
So I have a question with my water/meth at 20/80% and 93 octane am I safe ? I haven't dataloged it yet as I will have to rescale everything because my maps only go to 20 psi. I will say its frickin scary fast the engine bay pic show the Q bov then the QJR the first pic is of my maps that only go to 20 psig the rest is just what it looks like with and without the bumper .

E4RTH WORM JIM

Why use two BOV’s?

Under the hood looks

AIT must be low if running FMIC and Meth....

s2k manic

Having staggered bovs with different pressures let the Intercooler fill with boost by having the stiff spring bov close and a split second later the second weaker spring.bov Closing. It makes it very responsive. I have a Q50mm bov with 6 psi spring on hot side QJR bov with a 1.5 psi spring on the cold side. I had this spring in because I was making so much boost on the low came it created impeller chatter causing vibration and to keep it from happening I dropped VTEC to 3300 RPM that and the dual bovs keep the surge at bay and nearly 500whp to play .

s2k manic

Thanks for the offer I tuned it myself and have been constantly making maps to learn and stay sharp. I have recently taken up kpro I will have the kpro4 ECU and traction control installed and be turning before spring. Also gonna try a v mount if the wife lets me spend money.

E4RTH WORM JIM

Sounds good.

Just unsure if the FMIC is required versus an aftercooler, if running meth?

soulicious

Personally, I think you should have your car tuned on the dyno and then touch it up on the street.

s2k manic

I use virtual dyno to see if I gain or lose performance after I modify Maps. The car will be going on the dyno after I install K Pro. As far as ditching the aftercooler I will never look back currently building a v Mount system it gets hot in Texas and I don't like to put my car away when it's 105 outside. Also great on track days.

E4RTH WORM JIM

Smokey Donuts

If I'm reading this right, you just switched to this intercooler set up or have you been tuning on this with the intercooler and just changed BOV? Boost is just a measure of restriction so if this intercooler set up is less efficient than the aftercooler set up you may see "more" boost. As far as that boost level and octane rating being safe I'd keep a close eye on knock counts and keep your AFR on the rich end of the spectrum. Also, I'd extend your VE map to 23psi following your fueling trend for your "overboost" situation that way your ecu isn't blindly trying to guess fueling. Do you have any fail safe options set up on your AEM?

s2k manic

I have rescaled my maps.The intercooler is very efficient being there is very little boost loss. The tial Q50 bov I had on the intake side was blowing open causing the boost to fall off up top to 18psi. I thought it was belt slip on the very top end of the RPM scale and seeing as I was expecting a 4psi boost loss from the air to air I didn't explore the problem. Recently I have been running top-down alot and the loudness of the bov was too annoying so I swapped to the QRJ bov that was when I noticed an increased of boost through the whole rev range. I understand that boost pressure is a measurement of restriction so the restriction is a 2.2l motor not the intercooler that is 4" thick 12" tall and 26" or something like that with all 3" piping and as few turns as possible all in aluminum. All of my boots are in straight line areas of piping. I did this to minimize restriction. The hot side bov is a Q50 with an 8psi spring so when the throttle is closed rapidly the blower doesn't experience surge due to the high boost level. Currently I am looking for a 6" crank pulley or will order a 4.6" blower pulley to bring boost down to 16-17 where I can have more timing and make more power with less boost and lessen the chance of hurting the motor. Right now I have the equivalent of a 2.8-3" pulley on the blower so I don't think I am loosing much boost I have 3 psi at 2k RPM.