toddk911

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toddk911

http://www.kipanderson.net/rs/hobbs.htm

Laust Pedersen

As John (Vitesse) said, but check also that the WG is truly closed when it is supposed to.
The “de facto Rennlist standard” for testing spool-up is as follows:

1. Make sure the engine is thoroughly warm.
2. Drive on level ground
3. Cruise a little in 3rd gear (to warm up exhaust)
4. Slow down and shift to 4th making sure that the rpm is less than 2500
5. Floor the throttle (no traffic) and read at which rpm a boost of 15 psi is reached.

A heavier car gives better spool-up numbers than a light car and the ambient temperature also has an effect (I think colder gives better numbers).

And just to brag a little, I am getting somewhere between 2800 and 3000 on a K26-8 with modified housings, thermal coating/wrapping on the pipes and tight intake and exhaust systems (~75F ambient and standard weight with driver only).

Unfortunately some coaters persuade people to remove the factory heat-shields, believing that they can do a better job than the factory ... not so. However coating the inside of the headers will significantly reduce thermal stress (risk of cracking) and coating the outside of the heat-shields looks good and helps a little. I wrapped the bellow as well, since it has a large heat radiating surface area.

Laust

toddk911

Laust, is there any benifit to wrapping after you have had them coated?

SD Porsche Fan

Great feedback guys. I have replaced many vac. lines and am pulling 21-22 inHg of vacuum off throttle. I recently experienced a boost spike and saw about 21psi. is 5th gear that came on VERY quickly at 70mph at WOT. My dual port WG was installed less than 2k miles ago and I feel that the exhaust is tight so I am working off the assumption that my intake/exhaust/vacuum systems are working well.

At this point I am looking at wrapping as much as I can get access to from under the car. If I take the manifold and cross over off I will consider ceramic coating.

Questions:

1. Will a 3" cat back do anything or is it a waste of time unless you go full 3"?

2. EBC vs. MBC question: How does an EBC improve spool up compared to a MBC?

toddk911

"1. Will a 3" cat back do anything or is it a waste of time unless you go full 3"?

Are you still running with the cat installed????????????????????????

SD Porsche Fan

No, the cat is gone. I was curious if going 3" from the 4 bolt flange back to the muffler will do anything to help or will I be wasting money since the whole system isn't 3".

Mike1982

Also, I know this winter I will wrapping mine, what different brands are out there and how do they perform? I am interested in comparing real numbers and not just it feels faster.

Depape

can you wrap your hotside turbo using "header wrap"??? if not is there anything cheap out there...

Perry 951

I think I have better boost response with my converter in place. That said, the top end goes away.

I'll also give another vote for fixing any leaks and wrapping. It helps.

SD Porsche Fan

Aluminum foil is pretty cheap.

Depape

"Aluminum foil is pretty cheap. "

- i was thinking the same thing......
but really lol, can i use header wrap to wrap the turbo hotside??

ibkevin

One way..

Depape

^^^^ thats exactly what i wanted to know...so if i do that + the headers i should be pretty good .

ibkevin, what was the width of that wrap, and how much (length) did u use for that??

ibkevin

This is pretty common stuff, 2x25 and it's a little bit heavier for $31 at a local off-road shop. I used 18-20'. Works best with four hands to get 'er tight.

I like this method be cause it's continuious, if wound well there's no limit to the thickness (watch the build up at the top two hot section outlet bolts), and installing the turbo/downtube is a breeze. The 2pce Xover is pretty nice too!

The Snap Strap is pn# 735-3963 from NAPA for $24

I would definately avoid using this downstream of any oil leaks !!!