NS F355 Project (Page 53/73)
Yarmouth Fiero OCT 11, 01:27 PM
Thanks for the link Bridgetown. This is an interesting picture posted by Motoracer838. Mount the driver pulley's right on the gearbox output flanges with no bearings. Might be alot of side load on the gearbox shafts though.

fieroguru OCT 11, 03:36 PM
Every LS(x) swap in a Fiero that I have seen has had the intake flipped 180 (except the LS4s - they came from the factory with the TB over the bellhousing area).

The overall length of an LS(x) engine is shorter than the SBC, and the LS4's are quite economical. You might also want to consider using this Audi Transmission as it places the axle centerline very close to the bellhousing area of the engine.

[This message has been edited by fieroguru (edited 10-11-2014).]

Yarmouth Fiero OCT 11, 03:53 PM
Thanks Fieroguru. I have been trying to educate myself on the differences in chevy engines as I has always though SBC but there are many more models that may be more suitable. What Audi transmission model is that?
fieroguru OCT 11, 07:11 PM
2009+ A4/A5 2.0 Tdi 6 speed manual

Ratios:
Final: 3.693
1st: 3.778
2nd: 2.050
3rd: 1.321
4th: 0.970
5th: 0.757
6th: 0.625

Here is a picture from the front side:
Yarmouth Fiero OCT 11, 07:19 PM
Interesting indeed. I assume that's the differential jutting forward on the passenger side? Would there we an issue with the chevy bell housing? I'll have to do a search and see what the power / torque limits are. Thanks for the details Fieroguru.
355Fiero OCT 12, 01:35 AM
Graham;

I had looked in to this transmission a while ago as well. It looks like a good option but from what I saw, not very easily obtainable. Not sure about the torque capabilities either but it is similar to the old 016 transmissions which can handle a V8 torque when taken care of. The 012 Audis are weaker though. g86 Porsche transmissions are better for this V8 application than an 012. The 016 trans has the shortest distance between bell housing surface and axle centers. Aside from this trans of course. Any trans setup you hook up to an SBC you will need an adapter and a custom flywheel. A fellow over on madmechanics can make an adapter and flywheel for you.

My opinion, and my opinion only, would be to either look at maybe an Audi V8 or look back at a transverse setup like Booz. All your project though so looking forward to seeing what you will end up doing.

Cheers
Don

[This message has been edited by 355Fiero (edited 10-12-2014).]

Yarmouth Fiero OCT 12, 08:43 AM
Thanks Don. Looking up that transmission online seems to indicate its was mated with a 190 hp motor. It might not be adequate for my intended setup. Perhaps if I could use two of them ha-ha-ha.

I am still thinking some kind of Chevy V8 and look forward to the challenge of trying something new. I still think the belt drive has merit and it is just a matter of working out the details. I am lucky that my job affords me the opportunity to work on unique projects and I have alot of resources at my finger tips and consider the belt drive system a challenge. My intensions are to try and use off the shelf components whenever possible but If I see that I am facing a brick wall, I always have the traditional transverse arrangement to fall back on.

Please keep the ideas and suggestions coming. The more brains working on this the better.
Yarmouth Fiero OCT 12, 10:57 AM
Further refined the design by removing the pillow block bearings on the gearbox output shafts. As well, I should be able to mount the fwd bearings by including the supports as extensions on the bellhousing adapter plate that I'll certainly need to have machined. This will allow the arrangement to be installed and tensioned on the engine/ greabox prior to installation of the assembly into the car. The design at this stage is just conceptual at this stage.



fieroguru OCT 12, 05:15 PM

quote
Originally posted by Yarmouth Fiero:
Looking up that transmission online seems to indicate its was mated with a 190 hp motor. It might not be adequate for my intended setup.



Torque is what kills transmissions, not HP. Since that application is a diesel, its hp will be lower, but should have a higher torque rating. The engine it was behind was rated at 280 lb-ft, and the G6 F40 is only rated at 295 lb-ft... so it really boils down to who do you think builds their FWD transmissions with the higher safety margin? GM or Audi/VW?

BTW, the LS4 is 23 3/16" from the bellhousing to the forward edge of the harmonic balancer/pulley. The length of the block is 20 3/4" and the leading edge of the #1 bank is flush with the face of the block. The top of the intake is 17 1/2" above the crankshaft center line.
Yarmouth Fiero OCT 12, 05:38 PM
Thanks for the info Fieroguru. You are totally right about the torque vs hp, especially in the TDI. The site I looked at only posted the hp for some reason.

The LS4 is certainly a possibility for me. I have been reading as much as I could about it. Thanks for the measurements. The engine model I imported into my chassis drawing is a polygon model and I can't do much with it other than to turn parts on and off from view. I guess I need to spend the money and buy a subscription for proper 3D rhino engines/ gearbox drawings.