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Try replacing your O2 sensor. When those go bad you get terrible gas mileage. Also check your tire pressure too. Tire pressure is a large contributor to MPG as well.

Well I guess the reality of the situation is you drive a turbo car. You can't expect it to be the best on gas. Got to pay to play right?

I might just double check the shims to make sure they are within spec. I am still on the fence if degreeing is worth the time. I have not seen a lot of information saying that degreeing gives a significant gain. It might be needed in my case since I am running a staggered cam setup?

I am using the Stinger EMS. Timing was around 17 degress at 22 psi. From 6800-7500 my timing was around 16 degrees and boost increased from 22-25. I have since changed my timing and it starts at 17 and ramps to 21 by redline. AFR was around 11-11.2 at 22psi. My AFR from 6800-7500 was around...

I have tested my intercooler setup for 35psi and the HKS SSQV does not leak. If it was me and I was basing this decision purely on performance then I would go for a Tial BOV. The HKS SSQV sounds ok but everyone has one...

I get about 16mpg in the city and about 22 mpg on the highway. This is driving nicely. Spirited driving I am usually getting around 12-13mpg. This is with a 1JZ, big single, cams, 22psi, 500whp ect.

Also the turbo is not clocked like that anymore. I just thought of something and the boost starts to drop off where the turbo starts to creep at 6800. I am willing to bet it might be in my tune then.

Well the first hit the boost spikes about 2 psi and then it settles and then the manifold starts to creep. So pretty much it goes 24psi at 4500 rpm then 22 psi from 4500-6500 and then from 6800-7500 it creeps to about 25 psi.

How much power did you lay down at 20psi?

I agree it still shouldn't fall off at 6800rpms. Should I just change out the cold side or the hot side as well? Will it still be a restriction being that the end tanks are only 2.5"? I can start playing with timing a bit and see what happens.

Ok well this is starting to make sense now. I get 20psi by 4400 rpms with cams. So my AR must be smaller than yours. That would explain why my turbo falls on its face by 6800 rpms. Well time will tell when I get a new turbo.

Turbo Drifter when did you hit full boost by on your IHI RHC7 setup?

Well I perfected my tune a bit more and added 1.5 degrees of timing at 22-23psi. It just pulls super hard now. I am curious to see what it will put down. I know that there is still a lot more that can be had out of this setup.

I guess I should get myself added on this list as well. 482whp 406TQ at 22 psi uses a 50/50 mix of water and methanol. Dynojet Modifications: 1JZGTE Jun 272 Exhaust, 264 Intake Cam Bosch 044 inline Fuel Pump, Stock intank pump rewired MK4 550cc Injectors Apexi IHI C7 Turbo 3 inch downpipe, BIC...

Any other ideas?

I have an ARC Intercooler with 2.5" outlets in dimensions 18x12x4 with 2.5" piping. The piping is the shortest I could mount it and has minimal bends. I will try just running it with the filter on and go from there. As for timing it increases as the RPMS go up. Just for reference I think my...

I dynoed my car a few weeks ago and I am still puzzled why my hp drops off significantly after 6800 rpms. The cams in the car are Jun 272 exhaust and Jun 264 on the intake. Cam marks are pointing straight up and the crank is at zero. I do not have gears but most guys leave them at zero anyways...

When you guys say hit full spool how much boost are we talking? 10psi, 15, 18, 20 ect?

I am running the 044 in-line and it is loud. When you are idling at a light you can hear it over your BIC exhaust with no resonators and that is loud hahaha. Well looks like I may need to start running more boost with this turbo.

I would also like to know what it will put down now. My guess is easily 500rwhp.