From all the evidence I've seen, and from my own knowledge of the FI headers... I think they are tiny for this engine. They seem to fall on their *** @ high RPM as compared to PPE and the Momentums.

Just anecdotal evidence there though.

You mean the diameter of the primary tubes at the top? My experience with them is the car seems much better at ~5k+ on FI LTH than it does down in the 3-5K range. Sure that's the nature of the engine, too, but I think the FI's push it more in that direction.

Well, maybe you can measure the primary size and report back? I head always hard they were 1 5/8ths primaries, which IMO is a bit small.

The PPE's and momentums are (at least) 1 3/4. I know that seems like a small difference, but small changes like that make big differences.

That and I'm not crazy about the FI's collector design.

yeah me too I was told it was 1 5/8 on the PPE but after mesuring it it was in deed 1 3/4 steped to 1 7/8 ( all Outside Diameter )
there was probably a confusion at Inside and outside being told
since 1 3/4 OD is 1 5/8 ID .....

being steped to 1 7/8 from 1 3/4 will result in a slightly better breathing at HIGH Rpm (6000+) but at the cost of a very small lost in the lower powerband.

Is there a story behind this ? :tup:

Not really. Just coming back from riding the Dragon at ZDayz and they just happen to be cutting a lot of thick grass on the side of the road. So the two cars in front of me were throwing it up and my grill was catching all of it.

wow dude so thats a real pic? i thought that was photoshopped

Lol. No, it's real.

thats to awesome man lol

I was street swiping for the rest of the guys.

You're doing this or something like it, right?

AAM Competition - Nissan GT-R, 370Z Turbo Performance Specialists

Highly recommended especially on a FI car. I'm running a custom made AAM fuel return and regulator on my car.

I'm curious which forged internals are you going with for track motor spoon? I wasn't willing to risk my stock internal motor on track so pulled blower off until I can build proper engine to handle increased heat and stress. Want to get a sense of what people are doing to beef motors up for FI on the track.

This is pretty cool simple mod for a RFS. Never knew they had one using stock fuel rails. Usually you don't need a RFS unless over 600whp+.

Shamu, I'm not going to be running a built motor yet. Something happens, it happens. Ill be ready. But these cars can handle a lot FI on lower boost settings. It's the heat ill have to see about.

I am curious to see how your car performs under boost while at the track.
Most guys so far have been SC.

There was another guy that was hardly ever on here that tracked his FI TT kit on the track. He had a 500+ WHP on a Greddy kit. He would over heat the oil after 8 laps and he had a Hugh oil cooling system with no luck. So far as the motor itself and the longivity is another question.

I don't plan to run that much power on the track but heat will be a issue and I'm working on several mods to help add this. Then ill go from there. I ultimatly plan to have a Time Attack car so heat issues won't be all that much of an issue. Ill just have to see where my car takes me.