SwayBar

I believe that Twin Turbo Todd's engine uses the VW hydraulics and it spins to 8000 RPM.

SwayBar

Have you considered going to ITB's?

They are proven to work very well with the 32v engines, and one of these guys are putting down 450 rwhp with a 5.5L - that is incredible!

In other words, there is no need to build an expensive stroker engine which will only produce low-end torque, and only around 380 rwhp with the stock manifold.

ITB's are the answer to the 928 32v manifold issue for real horsepower - if that's what you're looking for.

hacker-pschorr

He was hitting the rev limiter too much so he raised it to 9,200rpm. His shift light comes on at 7,500 and per the logs, by the time he shifts is typically 8,500rpm, especially in 1st gear.

He's using the lightweight VW lifters, valve springs that are 260lbs pressure over the valve and the Gates racing timing belt. In Todd's opinion, running too weak of a valve spring is one of the issues folks with modified cams are running into. After that the stock timing belt stretches too much with stiffer springs.

He just happened to pop into the shop today and is talking over my shoulder.

I know Colin says you must run stiffer valve springs with his cams. My shop is currently working on new spring seats to work with more common off the shelf springs. Todd found a spring that fit the stock seats for his car.

Marti

good question, that was at .25mm lift. At 1mm lift the duration is 250 degrees

Marti

I took Colin's advice to run different springs to avoid any bind issues. I am still running these

Marti

I have considered ITBs as well as my own custom manifold. Problem has been that the engine is not set up to benefit from ITBs right now because of the cam profiles and timing. Once the engine performance moves forward then inlet can be revisited

Marti

I would really like to know what vw lifters I should be looking for as I do want to spin the engine to at least 7500 maybe 8000 tops

Marti

Not had much time to spend over the last couple of weeks but I finally worked out the lash cap sizes that I require to get the correct clearance between the cams and buckets. Not a particularly hard job, just a took a little time. Now I have to wait on a set of lash caps being made to size, then I can complete installation and get onto set up. The LCA will be much closer to standard S4 set up so I will use my spare head and cams to double check everything correct.

Certainly this time I will have no second guessing or doubt cast over my skills of setting up the exhaust to inlet timing correct, I messed around with it so much previously with the colt set up that I am now an expert

Have to say I am very impressed by the quality of the cams Kent produced, so well finished they spin the in the journals like a swiss watch

SwayBar

I was at Erik's last weekend for Memorial Day, and spoke with Turbo Todd. And yes it is true, his engine spins to 9200 RPM with S3 cams, VW lifters, 250 lb(?) valve springs, and the racing timing belt. It's the stock crank with aftermarket rods and pistons. He is putting out 1000+ rwhp.

BTW, Erik smoked a pork shoulder for 12 hours and it was absolutely perfect - just like the brisket he did last year. Thanks again Erik!

GregBBRD

Tough to get a better testimony/recommendation than that!

Marti

I am going to raise the rev limit a bit based on all this good feedback. I am still going to be cautious so will limit at 7500 for now.

My revised cams are back in the engine so testing is now commencing.

FredR

Fingers crossed you get the result you deserve for your efforts!

GregBBRD

No worries.
The engine will be begging you to shift, long before 7500 rpms. (Peak horsepower will be long gone.)
With a stock manifold, ~6800 rpms is pretty much the limit.

Bigfoot928

Is Todd using the coated Touareg lifters or the standard INI VW versions?

mark kibort

I think andersons motor and many others have shown with ONLY a manifold change (an some minor other changes) over 100hp is lurking.. so, the moral of the story is , put on that manifold or ITBs and see some big gains.