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Evan, I still don't understand how I got 5ms for a charge time before. as far as I can tell from my most recent measurements the LS1 dwell should not be larger than 1.9ms. The later truck coils should have a dwell of 1.5ms. Just an FYI: I confirmed my measurements on my turbo car which uses a Wolf 3D ECU where I can vary coil charge time. Using the same scope and series resistor on a running engine, anything more than 1.9ms on an LS1 coild will just create heat and decrease the life of the coil. What ECU are you using on your RB motor? Pete

I don't think it is valve float because it runs fine over 6000RPM, it just doesn't make as much power up there. The AFR is consistent in the 12.5-13.5 range cross all RPMs. The torque dip in the 3700RPM range is typical for NA L6s. Not sure what the dip at 5200RPM is. The dotted plot was with a stock port matched L6 EFI manifold with a 60mm TB. The solid plot is a dual TB SU manifold thing I put together. Pete

Just a point of reference. I may have to replace the springs as Paul noted. So far 4 years of track days and time trials and it still runs strong: - L28 N47 head - Comp cams 460 lift 280 dur. cam - Stock L28 N47 springs (180k miles, spring height measured within spec.) Note that Comp Cams advertises peak power at 6000RPM, and that is about where the power starts to drops off. As far as I can tell there is no valve float. How long will stock springs last? I have no idea. The next head I build will have performance springs. this is a budget motor and it doesn't want to break (likes to blow head gasket though). Pete

Looks great Clive. So far I love the new "Evil Z"...

Yes, very nice looking. I wonder of they have the side skirt that matches to cover the rocker panel. Probably would be expensive to ship to the US.

What head? What head gasket? What cam? What is your target CR?

Hi John, Can you define silent? You still have the normal R200 bearing/gear noise as when you run poly mustache bar front mount bushings, right? It's not a gear whine, but more of a mechanical noise that varies with speed. Mine made the same noise when it was an open differential. Pete

If I decide to start smoking again I'll consider them.....

You can switch to the rear anti-sway bar that mounts to the rear of the differential on the vertical rear suspension support struts. I know of at least one person running that anti-sway bar with the MML adapters. I find that on a street car where you are running softer springs (~225-250lb) a rear sway bar makes a big difference in handling. On a track car with 400+lb springs the car handles better without one. Pete

I had my car soda blasted. Cost me $800. Well worth it. The metal looks like new. Some of the parts like the hood look like they just popped out of the press. My car had 3 paint jobs on it, so this was a huge time saver. Pete

Definitely not in the bottom end. Check the valve lash on all cylinders. Make they all have a lash pad. Sounds like it is running OK (on all cylinders). Something is loose in the valve train. Pete

Finally starting to dig into this project: Going with an RB25DE instead of L28 and dual throttle bodies: Rear section needs to be replaced. Here is one from a donar car: Installing Bad Dog frame rails using my "custom" rotiserie: More to come.... Pete

I would say between $500 and $1500 depending on what parts it might need. I know the input shaft is really expensive as it is the only non-standard T5 part. My tranny guy said it would cost $800 for one from the dealer. So I have a bucket of T5 parts if people need them. the only thing I'm keeping is the bell housing.

I think your car looks great as is. No need for some cheesy stripes. Put the effort you would put into those stripes into performance mods (suspension, brakes, engine, etc.) Pete

Because I see grooves in the rockers. Look at the one all the way to the left: Again, it's up to you, but if it we my engine I would have them resurfaced. Pete

They look good to me. If you use a black sharpie the wipe pattern is a little easier to see than the blue. I would resurface the rockers and recheck the wipe pattern. Pete

Yes, the mounts points on the RB20, 25, and 26 blocks are the same. Not sure about the RB30, but they probably are.

Detonation will blow the head gasket. I guess my point is to just start with the fuel you plan on running on a regular basis. You can simulate a higher octane fuel with conservative timing and boost levels. Get the AFRs in the 12:1 range under boost. Any signs of detonation, let off. Have a friend listen for detonation. Back off the timing a couple degrees and do another pull. Doing this kind of tuning while driving is not easy (or safe). Finding a nice long stretch of road uphill is not easy. The dyno will simulate this for you. Pete

Super nice work! Inspiring! You page is bookmarked! Pete

Really nice work there. Like the color! Pete

This is all well and good, as long as you continue to run race fuel. Eventually you will want to run pump gas, and who knows, you may have detonation. If you like changing head gaskets, this is the way to go. Find a good dyno shop, and spend a couple hundred on dyno time. It is more than worth it. Pete

I knew it was something on the MS input side. Just happened to be the input to the EDIS module (VR sensor). Good job! Pete

Still sounds like an intermittent PIP connection somewhere. Did you scope the PIP and SAW? If so, are the voltage levels correct? The PIP should be 12V, but it can operate below that. The SAW needs to be a minimum of 3V to control the EDIS timing. Else it will be stuck in limp home mode. Look at the signals for potential noise problems. Pete

Check the solder side of the DB37 connector (remove shells) on both ends (if you are using a relay board) of the harness. I've seen solder connections in those areas. Pete

Yea, I know. Tried adjusting the AFR a bit in that area and it made no difference. AFR is around 13:1 there. We are doing NHMS a lot. First one of the year is 4/30. COMSCC is at the Glen today! I'm working..... Not sure if we will do any away events this year. Going to tail of the dragon in May (would love to drive the race car on that road!) Yea I thought of that on the way home from the dyno. Should of had Brad video the dyno session. Sounds sweet. I'll do some in car video this season for sure. Pete