PorKen

Looking for a set, or just a left (US driver's) side for (chip) testing on my S4.

(Would consider Carl's, but I need to take them on and off.)

GregBBRD

I've got a set I'd be happy to loan you.

MjRocket

Ken

Are the new chip update going to be set up to work with the spacers?

Should we start saving for a set of spacers?

Thx

PorKen

Sweet. I'll PM you with the address.

We'll see. It's entirely possible what I'm seeing is due to some other phenomenon, which is not so easily cured. It would be very cool if the spacer(s) evens out the left and right plenum timing*...AND makes more power. That's a big IF, but if there is a significant difference in timing, I'll make a separate chip or coding plug switch for an alternate left base map. (The chip will eventually self-adjust either way. Simply: more airflow = higher compression = less advance.)

I was already planning to go the dyno again after X-mas, but I will be able to tell right away from the logs. Even w/o the spacer it is running very strong (and it's still learning, chipping away at the rough edges).


Note you can still get the Yamabond-one-side spacers from Carl, but Roger hasn't made the o-ringed spacer in a while. Chicken and egg...unless there's demand for it, he won't make more.


*https://rennlist.com/forums/928-foru...de-at-wot.html

GregBBRD

Oops....I didn't realize there was a difference.

I guess I've never bought a set from Roger. These have no "0-ring" groove....so these may be left over from when I still bought stuff from Carl.

If you use Drei Bond (Silicone based, without the evil things associated with Silicone), instead of Yamabond, much easier to remove.

You are still welcome to use them, if you want to deal with the lack of the 0-ring groove.

PorKen

More of a pain, but I'll still take 'em.

I figure most folks will have them installed if they have them.

GregBBRD

I'll send you some Drei Bond, to make your swapping back and forth easier.

SeanR

I think Roger needs to restock these but I know what a pain it is to get them done. I get requests for them monthly.

terry gt

Ken , when are you going to try tuning a car with a set of Colin's triflow cams ? and do you think spacers would help with a slightly mod car ? It would be nice to get a stock n/a car to 400 rear wheel HP

mark kibort

so, we are saying here that the one side, is more restricted than the other, and with the spacer, we should see some flow or resonance gains? And, this is more than just a flow issue, its matching the pressure drop or flow issue with the fuel and spark changes, only to that particular side?

remember, I did the test on an engine with more consistent dyno numbers than most. (no real changes ever being done) and found that on the stroker engine, (all other things stock, but a fuel changed), there was a loss of HP with the plates in the max HP range. ( it lost 5 or so) replaced without the spacers, and the HP came back.

How are you determining that the flow on that one side is less than the other? is one side of the engine producing lower EGTs? the fuel is batch flowed, and are identical to each other, so there seems to be an indication that you should be able to determine / verify this by side to side O2 sensor output .. was that what was done? if so, how much variance was there. what would be the expected gains if that lower flow side was matched?

interesting project.

edit: I just read the link post regarding some of the testing criteria and methods. I think I might have a set of the o ring spacers too..... Illl check.

Tom in Austin

Cool project Ken, look forward to someday running your S4/GTS chip!

Crumpler

I had to rub my eyes when I saw Ken and Greg getting along.
It is a true holiday miracle...I feel like Jimmy Stewart in It's a Wonderful Life!

SeanR

And Roger just talked to his machinist to get more of his spacers made. It truly is the holidays.