Turbo Diesel

[Conover]

There's no restriction against 2L or below diesel engine in STL and/or turbo vehicles in STU. Gotta run the correct TIR for a turbo car and gotta meet 9.3.26 for fuel... - GA

Ok, so this answer is just a touch confusing, what your saying is that a 2.0L Turbo Diesel would go into STU?

A naturally aspirated Diesel under 2.0L would be in STL?

is that it?

[Greg Amy]

Ok, so this answer is just a touch confusing, what your saying is that a 2.0L Turbo Diesel would go into STU?

A naturally aspirated Diesel under 2.0L would be in STL?

is that it?

Yup.

[Matt93SE]

to make it a bit more clear...

1. 2.0L and under are allowed in STL. Turbo engines are not permitted. Note there is no distinction between gas and diesel engines...

2. If the engine is turbo, then it can run in STU following their inlet restrictor scale. no distinction between gas/diesel here either.

[Greg Amy]

I'm sorry if I'm a bit "obtuse" on the regs, I just wasn't clear where the confusion is. STCS does not specify gas or diesel other than to refer the user to GCR 9.3.26 for fuel requirements, and 9.3.26 starts out with something like "permitted fuel is defined as gasoline or diesel fuel meeting these specs" blah, blah, blah. Ergo, diesels are allowed in Super Touring and must meet the same prep regs.

Now, we have a request on the table for an alternate turbo for the older 1.9L diesel, and we're trying to get specific turbo information from the guy in order to address that. If someone is really sharp on these engines we'd consider some kind of alternate turbo for the whole range, we just need specific information to list on an allowance line. I don't think we're at a point where we're willing to let turbodiesels run without restrictors, but given their limited RPM range I don't see the TIRs having much of a performance affect on them anyway (except the wallet).

Bring on the TDIs! If you want some alternate equipment, send us a note with what you're looking to do with supporting info on what will result, and be as specific as you can.

GA

[Conover]

Okay, so if someone were to take a VW Corrado and drop in a 2.0l Tdi from a newer car, that would be allowed in STU. Just want to make sure I dont spend a bunch if time on something that has no home.

Next I just need to find some more loot, isn't that always the issue?

[Greg Amy]

Yup. On both counts.

Do me a favor, Cam, and find a good alternate turbo that will work well on both the 1.9L and 2L TDI engines. We want something - specific - that will be more dependable and offer reasonable performance. - GA

[Matt93SE]

Do me a favor, and find a good alternate engine that will work well on both the S13 and S14 240SX chassis. We want something - specific - that will be more dependable and offer reasonable performance. - GA

Fixed... :P

[Conover]

Yup. On both counts.

Do me a favor, Cam, and find a good alternate turbo that will work well on both the 1.9L and 2L TDI engines. We want something - specific - that will be more dependable and offer reasonable performance. - GA

That is a tall order. There are so many different wastegate configurations and manifolds I just don't see one turbo for all those applications. The 1.9L went through three generations itself, and the 2.0L common rail has electronically activated waste gate via a stepper motor rather than a traditional vacuum servo. Personally I was planning to use the stock turbo on the common rail, if that is the direction I end up going. It is a capable turbo from the factory, especially if you free it from it's DPF and EGR cooler, etc.

Now, if you want one replacement turbo for all three 1.9L variations, that is most likely possible, but probably not in the form of a direct bolt on application, it will probably require a custom tubular manifold. Is that what you are looking for?

I would say that we could start with the stock turbo from the 2.0L as the bench-mark to bring the 1.9 up to, that may be a reasonable expectation.

I have to confess that I am not 100% up to speed on all the aftermarket turbos and nozzles and so on available for these cars. Probably something I should research.

Have you had a request submitted already? Is that something I can look at, as a starting point?

[Matt93SE]

Yup.. the chassis is legal, and that's a legal engine from the same manufacturer..

So Greg.. here's a kicker for you..

D. Engines
1. Engines up to 6 cylinders and 3000 cubic centimeters factory
displacement are permitted, plus any others listed in 9.1.4.2.G.

[snip]

4. Compression ratio is limited to 12.0:1.

What's the compression ratio of a diesel engine? Maybe this should be addressed under E&O??

[Conover]

Yup.. the chassis is legal, and that's a legal engine from the same manufacturer..

So Greg.. here's a kicker for you..

What's the compression ratio of a diesel engine? Maybe this should be addressed under E&O??

23:1 or so

this does seem to be one item that could be a sticking point. . .